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TJ-II: Difference between revisions
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TJ-II is a flexible Heliac installed at Spain's [[Laboratorio Nacional de Fusión|National Fusion Laboratory]]. | TJ-II is a flexible Heliac installed at Spain's [[Laboratorio Nacional de Fusión|National Fusion Laboratory]]. | ||
It is one of Spain's [ | It is one of Spain's [https://www.ciencia.gob.es/Organismos-y-Centros/Infraestructuras-Cientificas-y-Tecnicas-Singulares-ICTS.html Unique Scientific and Technical Infrastructures]. | ||
It is currently operational. | It is currently operational. | ||
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The flexible Heliac TJ-II was designed on the basis of calculations performed by the team of physicists and engineers of [[CIEMAT]], in collaboration with the Oak Ridge National Laboratory ([http://en.wikipedia.org/wiki/ORNL ORNL], USA) and the Institut für PlasmaPhysik at Garching ([http://en.wikipedia.org/wiki/Max-Planck-Institut_f%C3%BCr_Plasmaphysik IPP], Germany). | The flexible Heliac TJ-II was designed on the basis of calculations performed by the team of physicists and engineers of [[CIEMAT]], in collaboration with the Oak Ridge National Laboratory ([http://en.wikipedia.org/wiki/ORNL ORNL], USA) and the Institut für PlasmaPhysik at Garching ([http://en.wikipedia.org/wiki/Max-Planck-Institut_f%C3%BCr_Plasmaphysik IPP], Germany). | ||
<ref> | <ref>T.C. Hender et al, ''Studies of a flexible heliac configuration'', [https://www.osti.gov/biblio/6007697-studies-flexible-heliac-configuration Report ORNL/TM-10374 (1987) OSTI ID: 6007697]</ref> | ||
The TJ-II project received preferential support from [[Euratom]] for phase I (Physics) in 1986 and for phase II (Engineering) in 1990. The [[TJ-II:Construction|construction of this flexible Heliac]] was carried out in parts according to its constitutive elements, which were commissioned to various European companies, although 60% of the investments reverted back to Spanish companies. | The TJ-II project received preferential support from [[Euratom]] for phase I (Physics) in 1986<ref>Application for EURATOM preferential support (Phase I) - TJ-II EXPERIMENT, [http://www-fusion.ciemat.es/InternalReport/fusion_1985.pdf Technical report, Asociación EURATOM/CIEMAT, 1985]</ref> and for phase II (Engineering) in 1990<ref>Application for EURATOM preferential support (Phase II) - TJ-II EXPERIMENT, [http://www-fusion.ciemat.es/InternalReport/fusion_1989b.pdf Technical report, Asociación EURATOM/CIEMAT, 1989]</ref>. The [[TJ-II:Construction|construction of this flexible Heliac]] was carried out in parts according to its constitutive elements, which were commissioned to various European companies, although 60% of the investments reverted back to Spanish companies. | ||
The first plasma was produced in 1997. | The first plasma was produced in 1997.<ref>[http://www.ciemat.es/vertices/vertices-292017/Vertices29/pdf/VERTICES29.pdf Special issue of CIEMAT's magazine ''Vertices''] commemorating 20 years of experiments (December, 2017)</ref> | ||
== Precedents == | == Precedents == | ||
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TJ-II discharges last around 0.25 s, with a repetition frequency of about 7 minutes. | TJ-II discharges last around 0.25 s, with a repetition frequency of about 7 minutes. | ||
{| class="wikitable" align="center" border="1" | |||
!''Parameter'' !!''Value''!!''Unit'' | |||
|- | |||
|Major radius, ''R<sub>0</sub>'': || 1.5 || m | |||
|- | |||
|Minor radius, ''a'': || < 0.22 || m | |||
|- | |||
|Plasma volume, ''V'': || 1 || m<sup>3</sup> | |||
|- | |||
|Field periods: || 4 || | |||
|- | |||
|[[TJ-II:Coil system|TF coils]]: || 32 || | |||
|- | |||
|Number of ports: || 104 || | |||
|- | |||
|Rotational transform, ''ι/2π'': || 0.9 - 2.5 || | |||
|- | |||
|Magnetic field on axis, ''B<sub>0</sub>'': || ~1 || T | |||
|- | |||
|ECRH heating power, ''P<sub>ECRH</sub>'': || < 600 || kW | |||
|- | |||
|NBI heating power, ''P<sub>NBI</sub>'': || < 2 || MW | |||
|- | |||
|Pulse length: || < 200 || ms | |||
|} | |||
== Goals and Research == | == Goals and Research == | ||
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* [[TJ-II:Compact Neutral Particle Analyzer|Compact Neutral Particle Analyzer]] | * [[TJ-II:Compact Neutral Particle Analyzer|Compact Neutral Particle Analyzer]] | ||
* [[TJ-II:Fast ion loss probe|Fast ion loss probe]] | * [[TJ-II:Fast ion loss probe|Fast ion loss probe]] | ||
* [[TJ-II:Retarding Field Analyzer|Retarding Field Analyzer]] | |||
* [[TJ-II:Fast camera|Fast camera]] | * [[TJ-II:Fast camera|Fast camera]] | ||