A compact Flexible Pellet Injector for the TJ-II Stellarator

Journal Article · Tue Jan 01 00:00:00 EST 2008 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2955706· OSTI ID:1001305

McCarthy, K. J. ^[1]; Combs, Stephen Kirk ^[2]; Baylor, Larry R ^[2]; Caughman, John B ^[2]; Fehling, Dan T ^[2]; Foust, Charles R ^[2]; McGill, James M ^[2]; Carmona, J. M. ^[3]; Rasmussen, David A ^[2]

---

1. Harvard-Smithsonian Center for Astrophysics
2. ORNL
3. Laboratory Nacional de Fusion, CIEMAT

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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1001305
• Journal Information: Review of Scientific Instruments, Vol. 79, Issue 10
• Country of Publication: United States
• Language: English