A compact flexible pellet injector for the TJ-II stellarator

Journal Article · Wed Oct 15 00:00:00 EDT 2008 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2955706· OSTI ID:21266639

McCarthy, K J; Carmona, J M ^[1]; Combs, S K; Baylor, L R; Caughman, J B. O.; Fehling, D T; Foust, C R; McGill, J M; Rasmussen, D A ^[2]

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1. Laboratory Nacional de Fusion, CIEMAT, Av. Complutense 22, 28040 Madrid (Spain)
2. Oak Ridge National Laboratory, P.O. Box 2009, Oak Ridge, Tennessee 37831-8071 (United States)

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 {approx}1000 m s{sup -1}.

• OSTI ID: 21266639
• Journal Information: Review of Scientific Instruments, Vol. 79, Issue 10; Conference: HTPD08: 17. topical conference on high-temperature plasma diagnostics, Albuquerque, NM (United States), 11-15 May 2008; Other Information: DOI: 10.1063/1.2955706; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DESIGN
FLEXIBILITY
HYDROGEN
ORNL
PELLETS
PLASMA
PLASMA CONFINEMENT
STELLARATORS
THERMONUCLEAR REACTOR MATERIALS
THERMONUCLEAR REACTORS
VALVES