Cs effects in a large multi-ampere D[sup [minus]] ion source

Conference · Mon Oct 05 00:00:00 EDT 1992 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:6935308

Watanabe, K; Hanada, M; Okumura, Y ^[1]; Fumelli, M; Jequier, F; Pamela, J ^[2]

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1. Japan Atomic Energy Research Institute, Naka-machi, Naka-gun, Ibaraki-ken, 311-01 (Japan)
2. Association EURATOM-CEA, CE Cadarache, 13108 St. Paul-Lez-Durance (France)

Cesium effects have been investigated in a semi-cylindrical negative ion source whose inner dimensions are 34 cm in diameter and 129 cm in length. D[sup [minus]] and H[sup [minus]] ion beams were extracted and accelerated by a multiaperture extraction system, which has 240 holes of 11.3 mm in diameter within an area of 6 cm[times]120 cm. The cesium effects, i.e., enhancement of the negative ion current and reduction of the optimum pressure and electron current, have been observed both in deuterium and in hydrogen operations. The enhancement factor of the D[sup [minus]] ion beam current by cesium was higher than that of the H[sup [minus]] ion beam current. Though the D[sup [minus]] current had a strong tendency of saturation with arc discharge power in pure volume operation, the D[sup [minus]] ion beam current was increased linearly with arc discharge power in cesium seeded operation. The ration of the D[sup [minus]] ion beam current to the H[sup [minus]] ion beam current was 0.8 in cesium seeded operation while the ratio in pure volume operation was 0.5. The D[sup [minus]] ion beams more than 2.2 A with an average current density of about 10 mA/cm[sup 2] was obtained at an energy of 100 keV for 5 sec at the beam targets which were located at 4 m and 6.4 m from the source.

• OSTI ID: 6935308
• Report Number(s): CONF-921145--
• Journal Information: AIP Conference Proceedings (American Institute of Physics); (United States), Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Vol. 287:1; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

661220* -- Particle Beam Production & Handling
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMP BEAM CURRENTS
ANIONS
BEAM CURRENTS
BEAMS
CHARGED PARTICLES
CURRENTS
DATA
DESIGN
DEUTERIUM IONS
EXPERIMENTAL DATA
HYDROGEN IONS
HYDROGEN IONS 1 MINUS
INFORMATION
ION BEAMS
ION SOURCES
IONS
NUMERICAL DATA
PULSE TECHNIQUES
Ta
Targets-- (1992-)