ITER is an international tokamak (magnetic confinement fusion) research/engineering proposal for an experimental project that will help to make the transition from today's studies of plasma physics to future electricity-producing fusion power plants. A tokamak is a machine producing a toroidal Magnetic field for confining a plasma. Magnetic confinement fusion is an approach to generating Fusion energy that uses Magnetic fields to confine the fusion fuel in the form of a plasma. In Physics and Chemistry, plasma is an Ionized Gas, in which a certain proportion of Electrons are free rather than being bound Fusion power is power generated by Nuclear fusion reactions In this kind of reaction two light atomic nuclei fuse It will build on research done with devices such as DIII-D, EAST, TFTR, Joint European Torus, JT-60, and T-15, and will be considerably larger than any of them. DIII-D is the name of a Tokamak machine developed in the 1980s by General Atomics in San Diego, USA as part of the ongoing effort to achieve magnetically The Experimental Advanced Superconducting Tokamak (EAST internal designation HT-7U is an experimental Superconducting Tokamak Magnetic fusion energy The Tokamak Fusion Test Reactor ( TFTR) was an experimental Tokamak fusion test reactor built at Princeton Plasma Physics Laboratory (in Princeton JET, the Joint European Torus, is the largest Nuclear fusion experimental reactor yet built JT-60 (JT stands for Japan Torus is the flagship of Japan 's magnetic fusion program previously run by the Japan Atomic Energy Research Institute (JAERI The T-15 is a Russian (previously Soviet Nuclear fusion research reactor based on the (Russian-invented Tokamak design

On November 21, 2006, the seven participants formally agreed to fund the project. Events 164 BC - Judas Maccabaeus, son of Mattathias of the Hasmonean family restores the Temple in Jerusalem. Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. ITER is an international Tokamak ( Magnetic confinement fusion) research/engineering proposal for an experimental project that will help to make the transition from ^[1] The program is anticipated to last for 30 years — 10 for construction, and 20 of operation — and cost approximately US$ 9. 3 billion ^[2], which would make it one of the most expensive modern technoscientific megaprojects. A megaproject is an extremely large-scale Investment Project. It will be based in Cadarache, France. Cadarache in Bouches-du-Rhône, Provence-Alpes-Côte-d'Azur, France is a Research center for Nuclear energy created in 1959 This article is about the country For a topic outline on this subject see List of basic France topics. It is technically ready to start construction and the first plasma operation is expected in 2016. 2016 ( MMXVI) will be a Leap year starting on Friday of the Gregorian calendar.

ITER will be designed to produce approximately 500 MW (500,000,000 watts) of fusion power sustained for up to 400 seconds^[3] (compared to JET's peak of 16 MW for less than a second) by the fusion of about 0. The watt (symbol W) is the SI derived unit of power, equal to one Joule of energy per Second. The watt (symbol W) is the SI derived unit of power, equal to one Joule of energy per Second. JET, the Joint European Torus, is the largest Nuclear fusion experimental reactor yet built 5 g of deuterium/tritium mixture in its approximately 840 m³ reactor chamber. Deuterium, also called heavy hydrogen, is a Stable isotope of Hydrogen with a Natural abundance in the Oceans of Earth Tritium (ˈtɹɪtiəm symbol or, also known as Hydrogen-3) is a radioactive Isotope of Hydrogen. Although ITER is expected to produce net power in the form of heat in the amount 5-10 times more than the amount of energy consumed to heat up the plasma to fusion temperatures, the generated heat will not be used to generate any electricity.

According to the ITER consortium, fusion power offers the potential of "environmentally benign, widely applicable and essentially inexhaustible"^[4][5] electricity, properties that they believe will be needed as world energy demands increase while simultaneously greenhouse gas emissions must be reduced,^[6] justifying the expensive research project. Greenhouse gases are gaseous constituents of the atmosphere bothnatural and anthropogenic that absorb and emit radiation at specific wavelengths within the spectrum of thermal infrared

ITER was originally an acronym for International Thermonuclear Experimental Reactor, but that title was dropped due to the negative popular connotation of "thermonuclear," especially when in conjunction with "experimental". Acronyms, initialisms, and alphabetisms are Abbreviations that are formed using the initial components in a phrase or name In Physics and Nuclear chemistry, nuclear fusion is the process by which multiple- like charged atomic nuclei join together to form a heavier nucleus In scientific inquiry an experiment ( Latin: Ex- periri, "to try out" is a method of investigating particular types of research questions or "Iter" also means "journey", "direction" or "way" in Latin^[7], and this double meaning reflects ITER's role in harnessing nuclear fusion as a peaceful power source. Latin ( lingua Latīna, laˈtiːna is an Italic language, historically spoken in Latium and Ancient Rome. In Physics and Nuclear chemistry, nuclear fusion is the process by which multiple- like charged atomic nuclei join together to form a heavier nucleus

Contents 1 Objectives 2 Reactor overview 3 History 4 Location 5 Participants 6 Funding 7 Criticism 7.1 Response to criticism 8 See also 9 References 10 External links

Objectives

The official objective of ITER is to "demonstrate the scientific and technological feasibility of fusion energy for peaceful purposes". ITER has a number of specific objectives, all concerned with developing a viable fusion power reactor:

• To momentarily produce ten times more thermal energy from fusion heating than is supplied by auxiliary heating (a Q value of 10). Thermal energy is the sum of the sensible energy and latent energy. The fusion energy gain factor, usually expressed with the symbol Q, is the ratio of Fusion power produced in a Nuclear fusion reactor to the power required
• To produce a steady-state plasma with a Q value greater than 5. The fusion energy gain factor, usually expressed with the symbol Q, is the ratio of Fusion power produced in a Nuclear fusion reactor to the power required
• To maintain a fusion pulse for up to eight minutes.
• To ignite a 'burning' (self-sustaining) plasma. In Physics and Chemistry, plasma is an Ionized Gas, in which a certain proportion of Electrons are free rather than being bound
• To develop technologies and processes needed for a fusion power plant — including superconducting magnets and remote handling (maintenance by robot). A superconducting magnet is an Electromagnet that is built using superconducting coils
• To verify tritium breeding concepts. Tritium (ˈtɹɪtiəm symbol or, also known as Hydrogen-3) is a radioactive Isotope of Hydrogen.
• To refine neutron shield/heat conversion technology (most of energy in the D+T fusion reaction is released in the form of fast neutrons).

Reactor overview

See also: nuclear fusion

When deuterium and tritium fuse, two nuclei come together to form a helium nucleus (an alpha particle), and a high-energy neutron. In Physics and Nuclear chemistry, nuclear fusion is the process by which multiple- like charged atomic nuclei join together to form a heavier nucleus Deuterium, also called heavy hydrogen, is a Stable isotope of Hydrogen with a Natural abundance in the Oceans of Earth Tritium (ˈtɹɪtiəm symbol or, also known as Hydrogen-3) is a radioactive Isotope of Hydrogen. The nucleus of an Atom is the very dense region consisting of Nucleons ( Protons and Neutrons, at the center of an atom Helium ( He) is a colorless odorless tasteless non-toxic Inert Monatomic Chemical Alpha particles (named after and denoted by the first letter in the Greek alphabet, α consist of two Protons and two Neutrons bound together into a This article is a discussion of neutrons in general For the specific case of a neutron found outside the nucleus see Free neutron.

While in fact nearly all stable isotopes lighter on the periodic table than iron will fuse with some other isotope and release energy, deuterium and tritium are by far the most attractive for energy generation as they require the lowest activation energy (thus lowest temperature) to do so. Isotopes (Greek isos = "equal" tópos = "site place" are any of the different types of atoms ( Nuclides The periodic table of the chemical elements is a tabular method of displaying the Chemical elements Although precursors to this table exist its invention is Iron (ˈаɪɚn is a Chemical element with the symbol Fe (ferrum and Atomic number 26 Deuterium, also called heavy hydrogen, is a Stable isotope of Hydrogen with a Natural abundance in the Oceans of Earth Tritium (ˈtɹɪtiəm symbol or, also known as Hydrogen-3) is a radioactive Isotope of Hydrogen.

All proto- and mid-life stars radiate enormous amounts of energy generated by fusion processes. Mass for mass, the deuterium-tritium fusion process releases roughly three times as much energy as uranium 235 fission, and millions of times more energy than a chemical reaction such as the burning of coal. It is the goal of a fusion power plant to harness this energy to produce electricity.

The activation energy for fusion is so high because the protons in each nucleus will tend to strongly repel one another, as they each have the same positive charge. The proton ( Greek πρῶτον / proton "first" is a Subatomic particle with an Electric charge of one positive The elementary charge, usually denoted e, is the Electric charge carried by a single Proton, or equivalently the negative of the electric charge carried A heuristic for estimating reaction rates is that nuclei must be able to get within 100 femtometer (1 × 10⁻¹³ meter) of each other, where the nuclei are increasingly likely to undergo quantum tunnelling past the electrostatic barrier and the turning point where the strong nuclear force and the electrostatic force are equally balanced, allowing them to fuse. heuristic (hyu̇-ˈris-tik is a method to help solve a problem commonly an informal method The metre or meter is a unit of Length. It is the basic unit of Length in the Metric system and in the International In Quantum mechanics, quantum tunnelling is a nanoscopic phenomenon in which a particle violates the principles of Classical mechanics by penetrating a Electrostatics is the branch of Science that deals with the Phenomena arising from what seems to be stationary Electric charges Since Classical The nuclear force (or nucleon-nucleon interaction or residual strong force) is the force between two or more Nucleons It is responsible for In ITER, this distance of approach is made possible by high temperatures and magnetic confinement. High temperatures give the nuclei enough energy to overcome their electrostatic repulsion (see Maxwell-Boltzmann distribution). Temperature is a physical property of a system that underlies the common notions of hot and cold something that is hotter generally has the greater temperature Valence shell electron pair repulsion (VSEPR theory (1957 is a model in Chemistry, which is used for predicting the shapes of individual Molecules based The Maxwell–Boltzmann distribution is a Probability distribution with applications in Physics and Chemistry. For deuterium and tritium, the optimal reaction rates occur at temperatures on the order of 100,000,000 K. The kelvin (symbol K) is a unit increment of Temperature and is one of the seven SI base units The Kelvin scale is a thermodynamic The plasma is heated to a high temperature by ohmic heating (running a current through the plasma). Joule heating is the process by which the passage of an Electric current through a conductor releases Heat. Additional heating is applied using neutral beam injection (which cross magnetic field lines without a net deflection and will not cause a large electromagnetic disruption) and radio frequency (RF) or microwave heating. In order to initiate a sustained fusion reaction it is usually necessary to use many methods to heat the plasma including RF heating Electron Cyclotron Radio frequency ( RF) is a Frequency or rate of Oscillation within the range of about 3 Hz to 300 GHz Microwaves are electromagnetic waves with Wavelengths ranging from 1 mm to 1 m or frequencies between 0

At such high temperatures, particles have a vast kinetic energy, and hence velocity. The kinetic energy of an object is the extra Energy which it possesses due to its motion If unconfined, the particles will rapidly escape, taking the energy with them, cooling the plasma to the point where net energy is no longer produced. A successful reactor would need to contain the particles in a small enough volume for a long enough time for much of the plasma to fuse. In ITER and many other magnetic confinement reactors, the plasma, a gas of charged particles, is confined using magnetic fields. Magnetic confinement fusion is an approach to generating Fusion energy that uses Magnetic fields to confine the fusion fuel in the form of a plasma. A charged particle moving through a magnetic field experiences a force perpendicular to the direction of travel, resulting in centripetal acceleration, thereby confining it to move in a circle. In Physics, a magnetic field is a Vector field that permeates space and which can exert a magnetic force on moving Electric charges The centripetal force is the external force required to make a body follow a curved path

A solid confinement vessel is also needed, both to shield the magnets and other equipment from high temperatures and energetic photons and particles, and to maintain a near-vacuum for the plasma to populate. The containment vessel is subjected to a barrage of very energetic particles, where electrons, ions, photons, alpha particles, and neutrons constantly bombard the surface and degrade the structure. The material must be designed to stand-up to this environment for long enough so that an entire powerplant would be economical. Tests of such materials will be carried out both at ITER and at IFMIF (International Fusion Materials Irradiation Facility). The International Fusion Material Irradiation Facility, also known as IFMIF, is an international scientific research program designed to test materials for suitability for use

Once fusion has begun, high energy neutrons will radiate from the reactive regions of the plasma, crossing magnetic field lines easily due to charge neutrality (see neutron flux). In Physics and other Sciences energy (from the Greek grc ἐνέργεια - Energeia, "activity operation" from grc ἐνεργός Neutron flux is a term referring to the number of Neutrons passing through an Area over a span of Time. Since it is the neutrons that receive the majority of the energy, they will be ITER's primary source of energy output. Ideally, alpha particles will expend their energy in the plasma, further heating it.

Beyond the inner wall of the containment vessel one of several test blanket modules is to be placed. These modules are designed to slow and absorb neutrons in a reliable and efficient manner, limiting damage to the rest of the structure, and breeding tritium from lithium and the incoming neutrons for fuel. Energy absorbed from the fast neutrons is extracted and passed onto the primary coolant. This heat energy would then be used to power an electricity-generating turbine in a real power plant; however, in ITER this heat is not of scientific interest, and will be extracted and disposed of.

History

ITER began in 1985 as a collaboration between the European Union (through EURATOM), the USA, the then Soviet Union and Japan. The European Union ( EU) is a political and economic union of twenty-seven member states, located primarily in The European Atomic Energy Community (EAEC or Euratom is an international organisation which is semi-independent of but completely controlled by the European Community The United States of America —commonly referred to as the The Union of Soviet Socialist Republics (USSR was a constitutionally Socialist state that existed in Eurasia from 1922 to 1991 For a topic outline on this subject see List of basic Japan topics. Conceptual and engineering design phases led to an acceptable, detailed design in 2001, underpinned by US$650 million worth of research and development by the "ITER Parties" to establish its practical feasibility. Year 2001 ( MMI) was a Common year starting on Monday according to the Gregorian calendar. These parties (with the Russian Federation replacing the Soviet Union and with the USA opting out of the project in 1999 and returning in 2003) were joined in negotiations on the future construction, operation and decommissioning of ITER by Canada (who then terminated their participation at the end of 2003), the People's Republic of China, and the Republic of Korea. Russia (Россия Rossiya) or the Russian Federation ( Rossiyskaya Federatsiya) is a transcontinental Country extending Country to "Dominion of Canada" or "Canadian Federation" or anything else please read the Talk Page Year 2003 ( MMIII) was a Common year starting on Wednesday of the Gregorian calendar. Talk People's Republic of China) PEOPLE'S REPUBLIC OF CHINA ARTICLE GUIDELINES South Korea, officially the Republic of Korea and often referred to as Korea ( Korean: 대한민국 tɛː India officially became part of ITER on 6 December 2005. India, officially the Republic of India (भारत गणराज्य inc-Latn Bhārat Gaṇarājya; see also other Indian languages) is a country Events 1060 - Béla I of Hungary is crowned king of Hungary 1240 - Mongol invasion of Rus: Kiev Year 2005 ( MMV) was a Common year starting on Saturday (link displays full calendar of the Gregorian calendar. The project is expected to cost about € 5 billion (US$7. 6 billion) over its thirty year life.

On 28 June 2005, it was officially announced that ITER will be built in the European Union in Southern France. Events 1098 - Fighters of the First Crusade defeat Kerbogha of Mosul. Year 2005 ( MMV) was a Common year starting on Saturday (link displays full calendar of the Gregorian calendar. The European Union ( EU) is a political and economic union of twenty-seven member states, located primarily in This article is about the country For a topic outline on this subject see List of basic France topics. The negotiations that led to the decision ended in a compromise between the EU and Japan, in that Japan was promised 20 percent of the research staff on the French location of ITER, as well as the head of the administrative body of ITER. In addition, another research facility for the project will be built in Japan, and the European Union has agreed to contribute about 50% of the costs of this institution. ^[8]

On November 21, 2006, an international consortium signed a formal agreement to build the reactor. Events 164 BC - Judas Maccabaeus, son of Mattathias of the Hasmonean family restores the Temple in Jerusalem. Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. ^[9]

On September 24, 2007, the People's Republic of China became the seventh party who had deposited the ITER Agreement to the IAEA. Events 622 - Prophet Muhammad completes his hegira from Mecca to Medina. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Talk People's Republic of China) PEOPLE'S REPUBLIC OF CHINA ARTICLE GUIDELINES The International Atomic Energy Agency ( IAEA) is an international organization that seeks to promote the peaceful use of nuclear energy and to inhibit its

On October 24, 2007, the ITER Agreement entered into force and the ITER Organization legally came into existence. Events 69 - Second Battle of Bedriacum, forces under Antonius Primus the commander of the Danube armies loyal to Vespasian, defeat Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century.

ITER will run in parallel with a materials test facility, the International Fusion Materials Irradiation Facility (IFMIF), which will develop materials suitable for use in the extreme conditions that will be found in future fusion power plants. The International Fusion Material Irradiation Facility, also known as IFMIF, is an international scientific research program designed to test materials for suitability for use Both of these will be followed by a demonstration power plant, DEMO, which would generate electricity. DEMO (DEMOnstration Power Plant is a proposed Nuclear fusion power plant that is intended to build upon the expected success of the ITER (originally DEMO would be the first to produce electric energy for commercial use.

A "fast track" road-map to a commercial fusion power plant has been sketched out. ^[10] This scenario, which assumes that ITER continues to demonstrate that the tokamak line of magnetic confinement is the most promising for power generation, anticipates a full-scale power plant coming on-line in 2050, potentially leading to a large-scale adoption of fusion power over the following thirty years. 2050 ( MML) will be a Common year starting on Saturday of the Gregorian calendar.

Location

The process of selecting a location for ITER was long and drawn out. Cadarache in Bouches-du-Rhône, Provence-Alpes-Côte-d'Azur, France is a Research center for Nuclear energy created in 1959 This article is about the country For a topic outline on this subject see List of basic France topics. The most likely sites were Cadarache in Provence-Alpes-Côte-d'Azur, France and Rokkasho, Aomori, Japan. Cadarache in Bouches-du-Rhône, Provence-Alpes-Côte-d'Azur, France is a Research center for Nuclear energy created in 1959 Provence-Alpes-Côte d'Azur (PACA ( Provençal Occitan: Provença-Aups-Còsta d'Azur in classical norm or Prouvènço-Aup-Costo d'Azur in Mistralian This article is about the country For a topic outline on this subject see List of basic France topics. is a village located at 4097 N 14137 E in Kamikita District, Aomori Prefecture, Japan. For a topic outline on this subject see List of basic Japan topics. Additionally, Canada announced a bid for the site in Clarington in May 2001, but withdrew from the race in 2003. Country to "Dominion of Canada" or "Canadian Federation" or anything else please read the Talk Page The Municipality of Clarington is a municipality in Ontario, Canada in the Regional Municipality of Durham May 2001: January - February - March - April - May - June - July - August - September Spain also offered a site at Vandellòs on 17 April 2002, but the EU decided to concentrate its support solely behind the French site in late November 2003. Spain () or the Kingdom of Spain (Reino de España is a country located mostly in southwestern Europe on the Iberian Peninsula. The Vandellòs Nuclear Power Plant is a Nuclear power station in Vandellós (province Tarragona) in Spain. Events 69 - After the First Battle of Bedriacum, Vitellius becomes Roman Emperor. See also 2002 (disambiguation Year 2002 ( MMII) was a Common year starting on Tuesday of the Gregorian calendar. From this point on, the choice was between France and Japan.

On 3 May 2005, the EU and Japan agreed to a process which would settle their dispute by July. Events 1491 - Kongo monarch Nkuwu Nzinga is baptised by Portuguese missionaries adopting the baptismal name of João Year 2005 ( MMV) was a Common year starting on Saturday (link displays full calendar of the Gregorian calendar.

At the final meeting in Moscow on 28 June 2005, the participating parties agreed on the site in Cadarache in Provence-Alpes-Côte-d'Azur, France. Moscow (Москва́ romanised: Moskvá, IPA: see also other names) is the Capital and the largest city of Events 1098 - Fighters of the First Crusade defeat Kerbogha of Mosul. Year 2005 ( MMV) was a Common year starting on Saturday (link displays full calendar of the Gregorian calendar. Cadarache in Bouches-du-Rhône, Provence-Alpes-Côte-d'Azur, France is a Research center for Nuclear energy created in 1959 Provence-Alpes-Côte d'Azur (PACA ( Provençal Occitan: Provença-Aups-Còsta d'Azur in classical norm or Prouvènço-Aup-Costo d'Azur in Mistralian This article is about the country For a topic outline on this subject see List of basic France topics.

Construction of the ITER complex is planned to begin in 2008, while assembly of the tokamak itself is scheduled to begin in the year 2011. ^[11]

Participants

Currently there are seven national and supranational parties participating in the ITER program: the European Union (EU), India, Japan, People's Republic of China, Russia, South Korea, and the USA. The European Union ( EU) is a political and economic union of twenty-seven member states, located primarily in India, officially the Republic of India (भारत गणराज्य inc-Latn Bhārat Gaṇarājya; see also other Indian languages) is a country For a topic outline on this subject see List of basic Japan topics. Talk People's Republic of China) PEOPLE'S REPUBLIC OF CHINA ARTICLE GUIDELINES Russia (Россия Rossiya) or the Russian Federation ( Rossiyskaya Federatsiya) is a transcontinental Country extending South Korea, officially the Republic of Korea and often referred to as Korea ( Korean: 대한민국 tɛː The United States of America —commonly referred to as the ^[12] Portugal, a member of the EU, aims to include Brazil in the project via an agreement celebrated between the governments of both countries. Portugal, officially the Portuguese Republic (República Portuguesa is a country on the Iberian Peninsula. |utc_offset = -2 to -4 |time_zone_DST = BRST |utc_offset_DST = -2 to -5 |cctld ^[13]

Canada was previously a full member, but has since pulled out due to a lack of funding from the Federal government. Country to "Dominion of Canada" or "Canadian Federation" or anything else please read the Talk Page The lack of funding also resulted in Canada withdrawing from its bid for the ITER site in 2003.

It was announced that participants in the ITER will consider Kazakhstan's offer to join the program. ^[14]

Funding

As it stands now, the proposed costs for ITER are € 5 billion for the construction, maintenance and the research connected with it during its lifetime. At the June 2005 conference in Moscow the participating members of the ITER cooperation agreed on the following division of funding contributions: 50% by the hosting member, the European Union and 10% by each non-hosting member. Moscow (Москва́ romanised: Moskvá, IPA: see also other names) is the Capital and the largest city of The European Union ( EU) is a political and economic union of twenty-seven member states, located primarily in ^[15] According to sources at the ITER meeting at Jeju, Korea, the six non-host partners will now contribute 6/11th of the total cost — a little over half — while EU will put in the rest. As for the industrial contribution, China, India, Korea, Russia, and the US will contribute 1/11th each, Japan 2/11th, and EU 4/11th. ^[16]

Although Japan's financial contribution as a non-hosting member is 1/11th of the total, the EU agreed to grant it a special status so that Japan will provide for 2/11th of the research staff at Cadarache and be awarded 2/11th of the construction contracts, while the European Union's staff and construction components contributions will be cut from 5/11th to 4/11th. For a topic outline on this subject see List of basic Japan topics. The European Union ( EU) is a political and economic union of twenty-seven member states, located primarily in

In December 2007, the United States zeroed funding for ITER in fiscal year 2008. ^[17]

Criticism

Bridget Woodman of Greenpeace said "Pursuing nuclear fusion and the ITER project is madness. Greenpeace, originally known as the Greenpeace Foundation, was founded in Vancouver, British Columbia, Canada in 1972 Nuclear fusion has all the problems of nuclear power, including producing nuclear waste and the risks of a nuclear accident. " "Governments should not waste our money on a dangerous toy which will never deliver any useful energy," said Jan Vande Putte of Greenpeace International. Greenpeace, originally known as the Greenpeace Foundation, was founded in Vancouver, British Columbia, Canada in 1972 "Instead, they should invest in renewable energy which is abundantly available, not in 2080 but today. Renewable energy is Energy generated from Natural resources mdashsuch as Sunlight, Wind, Rain, tides and geothermal "^[18]

French environmental groups said the project ITER, was "dangerous", "costly", and "not a job generator". A French association including about 700 anti-nuclear groups, Sortir du nucléaire (Get Out of Nuclear Energy), also claimed that ITER was a hazard because scientists did not yet know how to manipulate the high-energy deuterium and tritium hydrogen isotopes used in the fusion process. Deuterium, also called heavy hydrogen, is a Stable isotope of Hydrogen with a Natural abundance in the Oceans of Earth Tritium (ˈtɹɪtiəm symbol or, also known as Hydrogen-3) is a radioactive Isotope of Hydrogen. Hydrogen (ˈhaɪdrədʒən is the Chemical element with Atomic number 1 ^[19]

The ITER project confronts numerous technically challenging issues. French physicist Sébastien Balibar, director of research at the CNRS said We say that we will put the sun into a box. The idea is pretty. The problem is, we don't know how to make the box. ^{[20] [21]}

A technical concern is that the 14 MeV neutrons produced by the fusion reactions will damage the materials from which the reactor is built. ^[22] Research is in progress at IFMIF to determine how and/or if reactor walls can be designed to last long enough to make a commercial power plant economically viable in the presence of the intense neutron bombardment. The International Fusion Material Irradiation Facility, also known as IFMIF, is an international scientific research program designed to test materials for suitability for use The damage is primarily caused by high energy neutrons knocking atoms out of their normal position in the crystal lattice. A related problem for a future commercial fusion power plant is that the neutron bombardment will induce radioactivity in the reactor itself. Maintaining and decommissioning a commercial reactor may thus be difficult and expensive. Another problem is that superconducting magnets are damaged by neutron fluxes.

Rebecca Harms, Green/EFA member of the European Parliament's Committee on Industry, Research and Energy, said: "In the next 50 years nuclear fusion will neither tackle climate change nor guarantee the security of our energy supply. Rebecca Harms (born 7 December 1956 in Hambrock, Uelzen) is a German politician and Member of the European Parliament for The European Parliament ( Europarl or EP) is the only directly elected parliamentary institution of the European Union (EU " Arguing that the EU's energy research should be focused elsewhere, she said: "The Green/EFA group demands that these funds be spent instead on energy research that is relevant to the future. A major focus should now be put on renewable sources of energy. " French Green party lawmaker Noël Mamère claims that more concrete efforts to fight present-day global warming will be neglected as a result of ITER: "This is not good news for the fight against the greenhouse effect because we're going to put ten billion euros towards a project that has a term of 30-50 years when we're not even sure it will be effective. Noël Mamère (born December 25, 1948 in Libourne, Gironde, France) is a French Politician of the "^[23]

A number of fusion researchers working on non-tokamak systems, such as Robert Bussard and Eric Lerner, have been critical of ITER for diverting funding that they believe could be used for their potentially more reasonable and/or cost effective fusion power plant designs. Robert W Bussard ( August 11 1928 &ndash October 6 2007) was an American Physicist who worked primarily in Nuclear Eric J Lerner is a Popular science writer independent plasma researcher and an advocate of Plasma cosmology, a Nonstandard cosmology. ^{[24] [25]} Criticisms levied often revolve around an unwillingness by ITER supporters to face up to potential problems (both technical and economic) due to the number of scientists' jobs that are on the line with tokamak research. ^[24] An informal overview of the last decade of work was presented at the 57th International Astronautical Congress in October 2006. ^[26]

Response to criticism

Proponents believe that much of the ITER criticism is misleading and inaccurate, in particular the allegations of the experiment's "inherent danger. " The stated goals for a commercial fusion power station design are that the amount of radioactive waste produced be hundreds of times less than that of a fission reactor, that it produce no long-lived radioactive waste, and that it be impossible for any fusion reactor to undergo a large-scale runaway chain reaction. Radioactive wastes are Waste types containing radioactive Chemical elements that do not have a practical purpose A nuclear meltdown is a term for a severe Nuclear reactor accident This is because direct contact with the walls of the reactor would contaminate the plasma, cooling it down immediately and stopping the fusion process. Besides which, the amount of fuel planned to be contained in a fusion reactor chamber (one half gram of deuterium/tritium fuel^[27]) is only enough to sustain the reaction for an hour at maximum,^[28] whereas a fission reactor usually contains several years' worth of fuel. For other uses of the words gram or gramme see Gram (disambiguation. ^[29] In case of accident (or intentional act of terrorism) a fusion reactor releases far less radioactive pollution than an ordinary fission nuclear plant. Besides, tritium being lighter than air would rise up into stratosphere where it very soon dilutes to concentrations far below natural background radioactivity of air. Proponents note that large-scale fusion power — if it works — will be able to produce reliable electricity on demand and with virtually zero pollution (no gaseous CO₂ / SO₂ / NO_x by-products are produced). Pollution is the introduction of contaminants into an environment that causes instability disorder harm or discomfort to the physical systems or living organisms they are in

According to researchers at a demonstration reactor in Japan, a fusion generator should be feasible in the 2030s and no later than the 2050s. Japan is pursuing its own research program with several operational facilities exploring different aspects of practicability. ^[30]

In the United States alone, electricity accounts for US$210 billion in annual sales. ^[31] Asia's electricity sector attracted US$93 billion in private investment between 1990 and 1999. ^[32] These figures take into account only current prices. With petroleum prices widely expected to rise, political pressure on carbon production, and steadily increasing demand, these figures will undoubtedly also rise. Proponents contend that an investment in research now should be viewed as an attempt to earn a far greater future return for the economy. Also, worldwide investment of less than US$1 billion per year into ITER is not incompatible with concurrent research into other methods of power generation.

Contrary to criticism, proponents of ITER assert that there are significant employment benefits associated with the project. ITER will provide employment for hundreds of physicists, engineers, material scientists, construction workers and technicians in the short term, and if successful, will lead to a global industry of fusion-based power generation.

Supporters of ITER emphasize that the only way to convincingly prove ideas for withstanding the intense neutron flux is to experimentally subject materials to that flux — one of the primary missions of ITER and the IFMIF,^[33] and both facilities will be of vital importance to the effort due to the differences in neutron power spectra between a real D-T burning plasma and the spectrum to be produced by IFMIF. ^[34] The purpose of ITER is to explore the scientific and engineering questions surrounding fusion power plants, such that it may be possible to build one intelligently in the future. It is nearly impossible to get satisfactory theoretical results regarding the properties of materials under an intense energetic neutron flux, and burning plasmas are expected to have quite different properties from externally heated plasmas. The point has been reached, according to supporters, where answering these questions about fusion reactors by experiment (via ITER) is an economical research investment, given the monumental potential benefit.

Furthermore the main line of research—the tokamak—has been developed to the point that it is now possible to undertake the penultimate step in magnetic confinement plasma physics research—the investigation of ‘burning’ plasmas in which the vast majority of the heating is provided by the fusion event itself. A detailed engineering design, supported by substantial technology R&D, has been developed for a tokamak experiment which would explore burning plasma physics and integrate reactor relevant technology. A tokamak is a machine producing a toroidal Magnetic field for confining a plasma. In Physics and Chemistry, plasma is an Ionized Gas, in which a certain proportion of Electrons are free rather than being bound In the tokamak research program, recent advances in controlling the internal configuration of the plasma have led to the achievement of substantially improved energy and pressure confinement in tokamaks—the so-called ‘advanced tokamak’ modes—which reduces the projected cost of electricity from tokamak reactors by a factor of two to a value only about 50% more than the projected cost of electricity from advanced light-water reactors. In parallel, progress in the development of advanced, low activation structural materials supports the promise of environmentally benign fusion reactors, and research into alternate confinement concepts is yielding promise of future improvements in confinement. ^[35]

Finally, supporters point out that other potential replacements to the current use of fossil fuel sources have environmental issues of their own. Solar, wind, and hydroelectric power all have a relatively low power output per square kilometer compared to ITER's successor DEMO which, at 500 MW, should have an energy density that exceeds even large fission power plants (but note that this number is to be taken with a grain of salt, since the DEMO article claims ITER puts out 500 MW and DEMO 2000 MW). Solar energy is the Light and radiant heat from the Sun that powers Earth 's Climate and Weather and sustains Life Wind Power is the conversion of wind energy into a useful form such as electricity using Wind turbines At the end of 2007 worldwide capacity of wind-powered generators was Hydroelectricity is electricity generated by Hydropower, ie the production of power through use of the gravitational force of falling water DEMO (DEMOnstration Power Plant is a proposed Nuclear fusion power plant that is intended to build upon the expected success of the ITER (originally ^[36] If fusion ever becomes commercially viable, greenhouse gas emissions from electric power generation could be almost completely eliminated, with minimal environmental impact and without long-term nuclear waste issues. Greenhouse gases are gaseous constituents of the atmosphere bothnatural and anthropogenic that absorb and emit radiation at specific wavelengths within the spectrum of thermal infrared

See also

• DEMO
• International Fusion Materials Irradiation Facility
• Fusion power
• Nuclear power in France

References

External links

• ITER home page, includes pictures and diagrams available to use for educational purposes

• ITER Design Thorough overview of entire project
• Beyond ITER The timescale to a commercial fusion power plant by 2050.
• ITER Technical Objectives

• French Government ITER page
• CEA ITER page
• Commission particulière du débat public Projet ITER (French site)
• EFDA home page
• IFMIF home page.
• FIRE home page, with current news on ITER and other burning plasma developments
• Princeton Plasma Physics Laboratory
• The Fast Track To Fusion Power by Chris Llewellyn Smith of the UK Atomic Energy Authority
• Climate Change Chronicles article about France winning the ITER contract
• ITER and ORNL
• Reuters News Agency
• Fusion reactors explained by HowStuffWorks
• Unofficial ITER fan club
• IPR Institute for Plasma Research
• What is a megaproject?

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