Alumino-silicate ion sources for accelerator applications

Conference · Tue Oct 01 00:00:00 EDT 1985 · IEEE Trans. Nucl. Sci.; (United States)

OSTI ID:5949673

Warwick, A I

As part of the program of Heavy Ion Fusion Accelerator Research at the Lawrence Berkeley Laboratory, ion sources have been developed using thermionic emitters of singly charged alkali metal ions. These emitters are flat surfaces of alumino-silicate, loaded with the appropriate ion. They have become convenient and reliable sources producing pulsed beams of very low emittance. Thermionic emission of ions from alumino-silicates has been known for a very long time (1). Here we focus on the practical application as accelerator ion sources. We discuss the fabrication and heating of large area emitters, uniformity of emission and the maximum ion current density which can be extracted under space charge limited conditions, with zero electric field on the emitter surface. Results are presented for Na, K and Cs ions showing maximum space charge limited current densities of 25, 40 and 120 mAcm/sup -2/ respectively. In the case of cesium we have produced a 5 mA beam at a kinetic energy of 200 keV with normalized emittance 1.2X10/sup -7/ ..pi.. m rad.

• Research Organization: Lawrence Berkeley Laboratory, Berkeley, CA
• OSTI ID: 5949673
• Report Number(s): CONF-850504-
• Journal Information: IEEE Trans. Nucl. Sci.; (United States), Vol. NS-32:5; Conference: Particle accelerator conference, Vancouver, Canada, 13 May 1985
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ION SOURCES
THERMIONIC EMITTERS
CESIUM IONS
HEAVY ION ACCELERATORS
ION BEAMS
LAWRENCE BERKELEY LABORATORY
MILLI AMP BEAM CURRENTS
POTASSIUM IONS
SILICATES
SODIUM IONS
SPACE CHARGE
THERMIONIC EMISSION
ACCELERATORS
BEAM CURRENTS
BEAMS
CHARGED PARTICLES
CURRENTS
EMISSION
IONS
NATIONAL ORGANIZATIONS
OXYGEN COMPOUNDS
SILICON COMPOUNDS
US AEC
US DOE
US ERDA
US ORGANIZATIONS
430301* - Particle Accelerators- Ion Sources