TJ-II:Pellet injector: Difference between revisions
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[[File:TJ-II_pellet_injector.jpg|532px|thumb| | [[File:TJ-II_pellet_injector.jpg|532px|thumb|right|Diagram of the TJ-II pellet injector]] | ||
A compact multi-barrel pellet injector system is being | |||
developed for the [[TJ-II]] stellarator (location: [[TJ-II:Sectors|sector]] B2). | |||
Its design is based on the | |||
system currently installed at the MST facility (Univ. Winconsin) | |||
and will provide maximum flexibility at minimal cost, while also | |||
allowing for future upgrades. It is a four-barrel system destined | |||
for use both as an active plasma diagnostic and as a plasma | |||
fueling source. In order to achieve both objectives it will be | |||
sufficiently flexible to allow frozen hydrogen pellets with | |||
diameters from 0.4 to 1 mm to be formed and accelerated to | |||
velocities between 100 and 1000 m s<sup>-1</sup>. However, floor space | |||
restrictions and nearest-neighbor considerations limits the | |||
overall length to <1.7 m (mechanical punch end to final guide | |||
tube interfaces). This will be done by redesigns of the MST gun | |||
barrel, vacuum coupling, gas dump and guide tube sectors. | |||
Finally, the system is completed by stand-alone instrumentation | |||
and controls, as well as LabView controlled gas manifolds. | |||
<ref>K.J. McCarthy et al, ''A compact flexible pellet injector for the TJ-II stellarator'', [[doi:10.1109/FUSION.2005.252922|Proc. 21<sup>st</sup> IEEE/NPSS Symposium on Fusion Engineering 2005 (SOFE05)]]</ref> | |||
<ref>K.J. McCarthy et al, ''A compact flexible pellet injector for the TJ-II stellarator'', [[doi:10.1063/1.2955706|Rev. Sci. Instrum. '''79''' (2008) 10F321]]</ref> | |||
<ref>S.K. Combs, C.R. Foust, J.M. McGill, L.R. Baylor, J.B.O. Caughman, D.T. Fehling, J.H. Harris, S.J. Meitner, D.A. Rasmussen, K.J. McCarthy, M. Chamorro, R. Garcia, C. Hidalgo, M. Medrano, E. Mirones, J. Olivares, and R. Unamuno, ''A New Four-Barrel Pellet Injection System for the TJ-II Stellarator,'' [[doi:10.1109/SOFE.2011.6052244|Proceedings 2011 IEEE/NPSS 24<sup>th</sup> Symposium on Fusion Engineering, June 26–30, 2011, Chicago, Illinois]]</ref> | |||
<ref>S. K. Combs et al., ''Results from Laboratory Testing of a New Four-Barrel Pellet Injector for the TJ-II Stellarator'', [http://epubs.ans.org/?a=19144 Fusion Science and Technology, '''64''', 3 (2013) 513]</ref> | |||
<ref>N. Panadero, K. J. McCarthy, E. de la Cal, J. Hernández Sánchez, R. García, M. Navarro and | |||
TJ-II team, ''Observation of Cryogenic Hydrogen Pellet Ablation with a Fast-frame Camera System in the TJ II Stellarator'', [http://ocs.ciemat.es/EPS2016PAP/pdf/P1.008.pdf 43rd EPS Conference on Plasma Physics, Leuven, Belgium (2016) P1.008]</ref> | |||
Recently, the system was used to inject tracer-encapsulated solid pellets. | |||
<ref>N. Tamura, K.J. McCarthy, H. Hayashi, et al., ''Tracer-Encapsulated Solid Pellet (TESPEL) injection system for the TJ-II stellarator'', [[doi:10.1063/1.4962303|Rev. Sci. Instrum. '''87''' (2016) 11D619]]</ref> | |||
[[File:PelletInjector15022012.jpg|500px|thumb|right|Pellet injector testing setup, February 2012]] | |||
[[File:5456 pellet.jpg|500px|thumb|right|Image of 1 mm pellet]] | |||
[[File:Tomo37486.gif|640px|thumb|left|[[TJ-II:Tomography|Tomographic reconstruction]] of emission from [[TJ-II:Bolometry|Bolometry]] after pellet enters [[TJ-II]] plasma]] | |||
==References== | |||
<references /> | |||
Latest revision as of 19:10, 3 April 2018
A compact multi-barrel pellet injector system is being developed for the TJ-II stellarator (location: sector B2). Its design is based on the system currently installed at the MST facility (Univ. Winconsin) and will provide maximum flexibility at minimal cost, while also allowing for future upgrades. It is a four-barrel system destined for use both as an active plasma diagnostic and as a plasma fueling source. In order to achieve both objectives it will be sufficiently flexible to allow frozen hydrogen pellets with diameters from 0.4 to 1 mm to be formed and accelerated to velocities between 100 and 1000 m s-1. However, floor space restrictions and nearest-neighbor considerations limits the overall length to <1.7 m (mechanical punch end to final guide tube interfaces). This will be done by redesigns of the MST gun barrel, vacuum coupling, gas dump and guide tube sectors. Finally, the system is completed by stand-alone instrumentation and controls, as well as LabView controlled gas manifolds. [1] [2] [3] [4] [5] Recently, the system was used to inject tracer-encapsulated solid pellets. [6]
References
- ↑ K.J. McCarthy et al, A compact flexible pellet injector for the TJ-II stellarator, Proc. 21st IEEE/NPSS Symposium on Fusion Engineering 2005 (SOFE05)
- ↑ K.J. McCarthy et al, A compact flexible pellet injector for the TJ-II stellarator, Rev. Sci. Instrum. 79 (2008) 10F321
- ↑ S.K. Combs, C.R. Foust, J.M. McGill, L.R. Baylor, J.B.O. Caughman, D.T. Fehling, J.H. Harris, S.J. Meitner, D.A. Rasmussen, K.J. McCarthy, M. Chamorro, R. Garcia, C. Hidalgo, M. Medrano, E. Mirones, J. Olivares, and R. Unamuno, A New Four-Barrel Pellet Injection System for the TJ-II Stellarator, Proceedings 2011 IEEE/NPSS 24th Symposium on Fusion Engineering, June 26–30, 2011, Chicago, Illinois
- ↑ S. K. Combs et al., Results from Laboratory Testing of a New Four-Barrel Pellet Injector for the TJ-II Stellarator, Fusion Science and Technology, 64, 3 (2013) 513
- ↑ N. Panadero, K. J. McCarthy, E. de la Cal, J. Hernández Sánchez, R. García, M. Navarro and TJ-II team, Observation of Cryogenic Hydrogen Pellet Ablation with a Fast-frame Camera System in the TJ II Stellarator, 43rd EPS Conference on Plasma Physics, Leuven, Belgium (2016) P1.008
- ↑ N. Tamura, K.J. McCarthy, H. Hayashi, et al., Tracer-Encapsulated Solid Pellet (TESPEL) injection system for the TJ-II stellarator, Rev. Sci. Instrum. 87 (2016) 11D619