Development of a plasma generator for a long pulse ion source for neutral beam injectors

Journal Article · Wed Jun 15 00:00:00 EDT 2011 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3599585· OSTI ID:22062356

Watanabe, K; Dairaku, M; Tobari, H; Kashiwagi, M; Inoue, T; Hanada, M ^[1]; Jeong, S H; Chang, D H; Kim, T S; Kim, B R; Seo, C S; Jin, J T; Lee, K W; In, S R; Oh, B H ^[2]; Kim, J ^[3]; Bae, Y S ^[4]

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1. Japan Atomic Energy Agency, 801-1 Mukouyama, Naka, Ibaraki-ken 311-0193 (Japan)
2. Korea Atomic Energy Research Institute, 1045 Daedeokdaero, Daejeon 305-353 (Korea, Republic of)
3. ProScience, San Diego, California 92025 (United States)
4. National Fusion Research Institute, 113 Gwahangno, Daejeon 305-333 (Korea, Republic of)

A plasma generator for a long pulse H{sup +}/D{sup +} ion source has been developed. The plasma generator was designed to produce 65 A H{sup +}/D{sup +} beams at an energy of 120 keV from an ion extraction area of 12 cm in width and 45 cm in length. Configuration of the plasma generator is a multi-cusp bucket type with SmCo permanent magnets. Dimension of a plasma chamber is 25 cm in width, 59 cm in length, and 32.5 cm in depth. The plasma generator was designed and fabricated at Japan Atomic Energy Agency. Source plasma generation and beam extraction tests for hydrogen coupling with an accelerator of the KSTAR ion source have been performed at the KSTAR neutral beam test stand under the agreement of Japan-Korea collaborative experiment. Spatial uniformity of the source plasma at the extraction region was measured using Langmuir probes and {+-}7% of the deviation from an averaged ion saturation current density was obtained. A long pulse test of the plasma generation up to 200 s with an arc discharge power of 70 kW has been successfully demonstrated. The arc discharge power satisfies the requirement of the beam production for the KSTAR NBI. A 70 keV, 41 A, 5 s hydrogen ion beam has been extracted with a high arc efficiency of 0.9 -1.1 A/kW at a beam extraction experiment. A deuteron yield of 77% was measured even at a low beam current density of 73 mA/cm{sup 2}.

• OSTI ID: 22062356
• Journal Information: Review of Scientific Instruments, Vol. 82, Issue 6; Other Information: (c) 2011 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
ACCELERATORS
BEAM CURRENTS
BEAM EXTRACTION
BEAM INJECTION
BEAM PRODUCTION
CURRENT DENSITY
CUSPED GEOMETRIES
DEUTERIUM IONS
ELECTRIC ARCS
HYDROGEN
HYDROGEN IONS 1 PLUS
ION SOURCES
JAEA
LANGMUIR PROBE
PERMANENT MAGNETS
PLASMA
PLASMA PRODUCTION
TOKAMAK DEVICES