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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 /> | |||