Cesium mixing in the multi-ampere volume H sup minus ion source

Conference · Sun Aug 05 00:00:00 EDT 1990 · AIP Conference Proceedings (American Institute of Physics); (USA)

OSTI ID:5913248

Okumura, Y; Hanada, M; Inoue, T; Kojima, H; Matsuda, Y; Ohara, Y; Seki, M; Watanabe, K ^[1]

---

1. Japan Atomic Energy Research Institute, Naka-machi, Naka-gun, Ibaraki-ken, (Japan)

A 7.8 A, 50 keV H{sup {minus}} ion beam was produced by a cesium seeded volume negative ion source. The source consists of a 25 cm{times}46 cm rectangular multicusp plasma generator and a 14 cm{times}36 cm multiaperture extractor. Without cesium, the source produced 3.4 A, 75 keV H{sup {minus}} ion beams. By seeding a small amount of cesium, we observed a big enhancement of H{sup {minus}} production efficiency by a factor of four, and a reduction of optimum operating pressure. Extracted electron current decreased to almost zero when we biased the plasma grid positive with respect to the anode. The effect lasted for more than a week once the cesium was injected for several seconds at an oven temperature of 280--300 {degree}C.

• OSTI ID: 5913248
• Report Number(s): CONF-891055--
• Journal Information: AIP Conference Proceedings (American Institute of Physics); (USA), Journal Name: AIP Conference Proceedings (American Institute of Physics); (USA) Vol. 210:1; ISSN 0094-243X; ISSN APCPC
• Country of Publication: United States
• Language: English

Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMP BEAM CURRENTS
ANIONS
BEAM CURRENTS
BEAM EXTRACTION
BEAM PRODUCTION
CESIUM IONS
CHARGED PARTICLES
CURRENTS
ELECTRON TEMPERATURE
ENERGY RANGE
HYDROGEN IONS
HYDROGEN IONS 1 MINUS
ION SOURCES
IONS
KEV RANGE
KEV RANGE 10-100
PLASMA SEEDING