TJ-II:Limiter: Difference between revisions

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[[TJ-II]] has two mobile limiters, located in [[TJ-II:Sectors|sectors]] A3 and C3 (105.5º and 295.5º), with a toroidal separation of 180º.
[[TJ-II]] has two mobile limiters, located in [[TJ-II:Sectors|sectors]] A3 and C3 (115.5º and 295.5º), with a toroidal separation of 180º.
<ref>[[doi:10.1016/S0022-3115(98)00829-0|E. de la Cal et al, ''The diagnosed mobile limiters of the TJ-II stellarator for plasma boundary studies'', J. Nucl. Mat. '''266-269''' (1999) 485]]</ref>
<ref>E. de la Cal et al, ''The diagnosed mobile limiters of the TJ-II stellarator for plasma boundary studies'', [[doi:10.1016/S0022-3115(98)00829-0|J. Nucl. Mat. '''266-269''' (1999) 485]]</ref>
The limiters are fitted with Langmuir probes and gas injection ports.
The limiters are fitted with Langmuir probes and gas injection ports.
<ref>[[doi:10.1016/S0022-3115(00)00525-0|E. de la Cal, B. Brañas, F.L. Tabarés, D. Tafalla, A.L. Fraguas, M.A. Pedrosa, V. Tribaldos, E. Ascasibar, J. Herranz, I. Pastor and TJ-II Team, ''Plasma boundary and SOL studies of ECH-plasmas in TJ-II stellarator with diagnosed mobile poloidal limiters'', Journal of Nuclear Materials, '''290-293''' (2001) 579-583]]</ref>
<ref>E. de la Cal, B. Brañas, F.L. Tabarés, D. Tafalla, A.L. Fraguas, M.A. Pedrosa, V. Tribaldos, E. Ascasibar, J. Herranz, I. Pastor and TJ-II Team, ''Plasma boundary and SOL studies of ECH-plasmas in TJ-II stellarator with diagnosed mobile poloidal limiters'', [[doi:10.1016/S0022-3115(00)00525-0|Journal of Nuclear Materials, '''290-293''' (2001) 579-583]]</ref>
<ref>[[doi:10.1016/j.jnucmat.2004.07.055|I. García-Cortés et al, ''Fuelling efficiency of hydrocarbons in TJ-II plasmas'', J. Nucl. Mat.  '''337-339''' (2005) 441-445]]</ref>
<ref>I. García-Cortés et al, ''Fuelling efficiency of hydrocarbons in TJ-II plasmas'', [[doi:10.1016/j.jnucmat.2004.07.055|J. Nucl. Mat.  '''337-339''' (2005) 441-445]]</ref>
<ref>[[doi:10.1016/j.jnucmat.2007.01.061|E. de la Cal et al, ''Hydrogen recycling and puffing at a poloidal limiter of TJ-II'', J. Nucl. Mat. '''363-365''' (2007) 764-769]]</ref>
<ref>E. de la Cal et al, ''Hydrogen recycling and puffing at a poloidal limiter of TJ-II'', [[doi:10.1016/j.jnucmat.2007.01.061|J. Nucl. Mat. '''363-365''' (2007) 764-769]]</ref>
A biasing voltage can be applied.
A biasing voltage can be applied.
<ref>[[doi:10.1088/0741-3335/46/1/018|C. Hidalgo et al, ''Improved confinement regimes induced by limiter biasing in the TJ-II stellarator'', Plasma Phys. Control. Fusion '''46''' (2004) 287-297]]</ref>
<ref>C. Hidalgo et al, ''Improved confinement regimes induced by limiter biasing in the TJ-II stellarator'', [[doi:10.1088/0741-3335/46/1/018|Plasma Phys. Control. Fusion '''46''' (2004) 287-297]]</ref>


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== Liquid Lithium limiters ==
== Liquid Lithium limiters ==


Currently (2010) a limiter upgrade is being prepared, consisting of liquid lithium limiters.
[[File:TJII_LLL.jpg|300px|thumb|right|Liquid Lithium Limiter with Capillary Porous System]]
<ref>[http://www-pub.iaea.org/mtcd/meetings/PDFplus/2010/cn180/cn180_papers/ftp_p1-34.pdf A.V. Vertkov, I.E. Lyublinski, F. Tabares, E. Ascasibar, ''Development of Liquid Lithium Limiter for Stellarator TJ-II'', 23<sup>rd</sup> IAEA Fusion Energy Conference, Daejon, Korea (2010) FTP/P1-34]</ref>
On May 2012 the LLL was installed in sector A.
<ref>[http://www-pub.iaea.org/mtcd/meetings/PDFplus/2010/cn180/cn180_papers/ftp_3-6rb.pdf I.E. Lyublinski, A.V. Vertkov, et al., ''Development and experimental study of Lithium based plasma facing elements for fusion reactor application'', 23<sup>rd</sup> IAEA Fusion Energy Conference, Daejon, Korea (2010) FTP/3-6Rb]</ref>
<ref>A.V. Vertkov, I.E. Lyublinski, F. Tabares, E. Ascasibar, ''Development of Liquid Lithium Limiter for Stellarator TJ-II'', [http://www-pub.iaea.org/mtcd/meetings/PDFplus/2010/cn180/cn180_papers/ftp_p1-34.pdf 23<sup>rd</sup> IAEA Fusion Energy Conference, Daejon, Korea (2010) FTP/P1-34]</ref>
 
<ref>I.E. Lyublinski, A.V. Vertkov, et al., ''Development and experimental study of Lithium based plasma facing elements for fusion reactor application'', [http://www-pub.iaea.org/mtcd/meetings/PDFplus/2010/cn180/cn180_papers/ftp_3-6rb.pdf 23<sup>rd</sup> IAEA Fusion Energy Conference, Daejon, Korea (2010) FTP/3-6Rb]</ref>
<ref>A.V. Vertkov, I.E. Liublinski, F.L. Tabarés et al., ''Status and prospect of the development of liquid lithium limiters for stellarotor TJ-II'', [[doi:10.1016/j.fusengdes.2011.10.004|Fus. Eng. and Design '''87''' (2012) 1755 - 1759]]</ref>
Experiments on D retention were performed at temperatures up to 400&deg;C.<ref>F.L. Tabarés et al. ''Studies of Plasma-Lithium Interactions in TJ-II'', [http://www-naweb.iaea.org/napc/physics/FEC/FEC2012/papers/632_EXP536.pdf IAEA 2012, EX/P5-36]</ref>
Also, biasing of the LLL respect to the plasma and respect to he C limiter in C3 were carried out.<ref>E. Oyarzabal et al. Proc 17<sup>th</sup> ISHW Padova, Sept 2013.</ref>
Insertion of the LLL up to 3 cm into the edge was possible without any apparent damage.
Biasing of the LLL to positive voltages led to improved energy and particle confinement in ECRH plasmas.
<ref>F.L. Tabarés et al. Proc 3<sup>rd</sup> ISLA Conference. Frascati, Oct 2013</ref>
In 2014, a second LLL unit has been installed in C3 to replace the former C limiter.


== References ==
== References ==
<references />
<references />

Latest revision as of 06:16, 13 October 2018

TJ-II has two mobile limiters, located in sectors A3 and C3 (115.5º and 295.5º), with a toroidal separation of 180º. [1] The limiters are fitted with Langmuir probes and gas injection ports. [2] [3] [4] A biasing voltage can be applied. [5]

TJ-II Limiter and plasma
TJ-II Limiter: photograph taken from port B8TANG (the location of the fast camera)

Liquid Lithium limiters

Liquid Lithium Limiter with Capillary Porous System

On May 2012 the LLL was installed in sector A. [6] [7] [8] Experiments on D retention were performed at temperatures up to 400°C.[9] Also, biasing of the LLL respect to the plasma and respect to he C limiter in C3 were carried out.[10] Insertion of the LLL up to 3 cm into the edge was possible without any apparent damage. Biasing of the LLL to positive voltages led to improved energy and particle confinement in ECRH plasmas. [11] In 2014, a second LLL unit has been installed in C3 to replace the former C limiter.

References

  1. ↑ E. de la Cal et al, The diagnosed mobile limiters of the TJ-II stellarator for plasma boundary studies, J. Nucl. Mat. 266-269 (1999) 485
  2. ↑ E. de la Cal, B. Brañas, F.L. Tabarés, D. Tafalla, A.L. Fraguas, M.A. Pedrosa, V. Tribaldos, E. Ascasibar, J. Herranz, I. Pastor and TJ-II Team, Plasma boundary and SOL studies of ECH-plasmas in TJ-II stellarator with diagnosed mobile poloidal limiters, Journal of Nuclear Materials, 290-293 (2001) 579-583
  3. ↑ I. García-Cortés et al, Fuelling efficiency of hydrocarbons in TJ-II plasmas, J. Nucl. Mat. 337-339 (2005) 441-445
  4. ↑ E. de la Cal et al, Hydrogen recycling and puffing at a poloidal limiter of TJ-II, J. Nucl. Mat. 363-365 (2007) 764-769
  5. ↑ C. Hidalgo et al, Improved confinement regimes induced by limiter biasing in the TJ-II stellarator, Plasma Phys. Control. Fusion 46 (2004) 287-297
  6. ↑ A.V. Vertkov, I.E. Lyublinski, F. Tabares, E. Ascasibar, Development of Liquid Lithium Limiter for Stellarator TJ-II, 23rd IAEA Fusion Energy Conference, Daejon, Korea (2010) FTP/P1-34
  7. ↑ I.E. Lyublinski, A.V. Vertkov, et al., Development and experimental study of Lithium based plasma facing elements for fusion reactor application, 23rd IAEA Fusion Energy Conference, Daejon, Korea (2010) FTP/3-6Rb
  8. ↑ A.V. Vertkov, I.E. Liublinski, F.L. Tabarés et al., Status and prospect of the development of liquid lithium limiters for stellarotor TJ-II, Fus. Eng. and Design 87 (2012) 1755 - 1759
  9. ↑ F.L. Tabarés et al. Studies of Plasma-Lithium Interactions in TJ-II, IAEA 2012, EX/P5-36
  10. ↑ E. Oyarzabal et al. Proc 17th ISHW Padova, Sept 2013.
  11. ↑ F.L. Tabarés et al. Proc 3rd ISLA Conference. Frascati, Oct 2013
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