TITLE

A compact flexible pellet injector for the TJ-II stellarator

AUTHOR(S)
McCarthy, K. J.; Combs, S. K.; Baylor, L. R.; Caughman, J. B. O.; Fehling, D. T.; Foust, C. R.; McGill, J. M.; Carmona, J. M.; Rasmussen, D. A.
PUB. DATE
October 2008
SOURCE
Review of Scientific Instruments;Oct2008, Vol. 79 Issue 10, p10F321
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A compact pellet injector is being built for the TJ-II stellarator. It is an upgraded version of the “pellet injector in a suitcase” developed at Oak Ridge National Laboratory and installed on the Madison Symmetric Torus where it continues to be used in many plasma experiments. The design aim is to provide maximum flexibility at minimal cost, while allowing for future upgrades. It is a four-barrel system equipped with a cryogenic refrigerator for in situ hydrogen pellet formation, a combined mechanical punch/propellant valve system, pellet diagnostics, and an injection line, destined for use as an active diagnostic and for fueling. In order to fulfill both objectives it will be sufficiently flexible to permit pellets, with diameters from 0.4 to 1 mm, to be fabricated and accelerated to velocities from 150 to ∼1000 m s-1.
ACCESSION #
35150064

 

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