Status of the Brookhaven National Laboratory (BNL) toroidal volume H sup minus source

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:6540614

Alessi, J G; Prelec, K

A volume H{sup {minus}} source having a toroidal discharge chamber and conical filter field has been developed. Parametric studies of this source have been in progress for two years. Extraction apertures from 0.5 cm{sup 2} to 1.87 cm{sup 2} have been tried, and an H {sup {minus}} current of up to 48 mA has been extracted. The electron-to-H {sup {minus}} current ratio in the extracted beam can be as low as 10 for {approx} 25 mA beam was 0.44{pi}mm mrad. When operating with deuterium, the D{sup {minus}} output wads 50--60% of the H{sup {minus}} current under the same discharge conditions. The addition of cesium to the discharge increased the H{sup {minus}} output and decreased the electron current so that at 30 mA of H{sup {minus}}, one obtained an electron-to-H{sup {minus}} ratio of 1. Using a two gap extractor, with a dipole field in the intermediate electrode, approximately 80% of the extracted electrons could be removed from the primary beam.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6540614
• Report Number(s): BNL-44624; CONF-9009200--15; ON: DE91000121
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430301* -- Particle Accelerators-- Ion Sources
ACCELERATORS
ANIONS
BEAM EMITTANCE
BEAM EXTRACTION
BNL
CHARGED PARTICLES
DESIGN
ELECTRODES
HYDROGEN IONS
HYDROGEN IONS 1 MINUS
ION SOURCES
IONS
LINEAR ACCELERATORS
NATIONAL ORGANIZATIONS
US AEC
US DOE
US ERDA
US ORGANIZATIONS