High intensity negative proton beams from a SNICS ion source

Conference · Tue Jan 01 04:00:00 EST 1991

OSTI ID:5463589

Evans, C R; Hollander, M G

For the past year we have been involved in a project to develop an intense (> 100{mu}A) negative proton beam from a SNICS (Source of Negative Ions by Cesium Sputtering) ion source. This report will cover how we accomplished and exceeded this goal by more than 40%. Included in these observations will be the following: A description of an effective method for making titanium hydride cathodes. How to overcome the limitations of the titanium hydride cathode. The modification of the SNICS source to improve output; including the installation of the conical ionizer and the gas cathode. A discussion of problems including: poisoning the proton beam with oxygen, alternative gas cathode materials, the clogging of the gas inlet, long burn-in times, and limited cathode life times. Finally, how to optimize source performance when using a gas cathode, and what is the mechanism by which a gas cathode operates; facts, fantasies, or myth.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5463589
• Report Number(s): LA-UR-92-905; CONF-9110258--5; ON: DE92011137
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430301* -- Particle Accelerators-- Ion Sources
ALKALI METALS
BEAMS
CATHODES
CESIUM
DESIGN
ELECTRODES
ELEMENTS
HYDRIDES
HYDROGEN COMPOUNDS
ION SOURCES
METALS
NUCLEON BEAMS
OPTIMIZATION
PARTICLE BEAMS
PERFORMANCE
PROTON BEAMS
TITANIUM COMPOUNDS
TITANIUM HYDRIDES
TRANSITION ELEMENT COMPOUNDS