Improvement of voltage holding capability in the 500 keV negative ion source for JT-60SA

Journal Article · Mon Feb 15 00:00:00 EST 2010 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3279399· OSTI ID:22053837

Tanaka, Y; Hanada, M; Kojima, A; Akino, N; Shimizu, T; Ohshima, K; Inoue, T; Watanabe, K; Taniguchi, M; Kashiwagi, M; Umeda, N; Tobari, H ^[1]; Grisham, L R ^[2]

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1. Japan Atomic Energy Agency, Naka, Ibaraki 311-0193 (Japan)
2. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)

Voltage holding capability of JT-60 negative ion source that has a large electrostatic negative ion accelerator with 45 cmx1.1 m acceleration grids was experimentally examined and improved to realize 500 keV, 22 A, and 100 s D{sup -} ion beams for JT-60 Super Advanced. The gap lengths in the acceleration stages were extended to reduce electric fields in a gap between the large grids and at the corner of the support flanges from the original 4-5 to 3-4 kV/mm. As a result, the voltage holding capability without beam acceleration has been successfully improved from 400 to 500 kV. The pulse duration to hold 500 kV reached 40 s of the power supply limitation.

• OSTI ID: 22053837
• Journal Information: Review of Scientific Instruments, Vol. 81, Issue 2; Conference: ICIS 2009: 13. international conference on ion sources, Gatlinburg, TN (United States), 20-25 Sep 2009; Other Information: (c) 2010 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ACCELERATORS
ANIONS
BEAM INJECTION
DEUTERIUM IONS
ELECTRIC FIELDS
ELECTRIC POTENTIAL
ION BEAMS
ION SOURCES
JT-60 TOKAMAK
KEV RANGE
PLASMA GUNS
POWER SUPPLIES