Negative ion beam processes
Los Alamos Scientific Laboratory fiscal year 1975 work on production of intense, very bright, negative hydrogen (H$sup -$), ion beams and conversion of a high-energy (a few hundred MeV) negative beam into a neutral beam are described. The ion source work has used a cesium charge exchange source that has produced H$sup -$ ion beams greater than or equal to 10 mA (about a factor of 10 greater than those available 1 yr ago) with a brightness of 1.4 x 10$sup 9$ A/m$sup 2$- rad$sup 2$ (about 18 times brighter than before). The high-energy, neutral beam production investigations have included measurements of the 800-MeV H$sup -$- stripping cross section in hydrogen gas (sigma/sub -10/, tentatively 4 x 10$sup - 19$ cm$sup 2$), 3- to 6-MeV H$sup -$-stripping cross sections in a hydrogen plasma (sigma/sub -10/, tentatively 2 to 4 x 10$sup -16$ cm$sup 2$), and the small-angle scattering that results from stripping an 800-MeV H$sup -$ ion beam to a neutral (H$sup 0$) beam in hydrogen gas. These last measurements were interrupted by the Los Alamos Meson Physics Facility shutdown in December 1974, but should be completed early in fiscal year 1976 when the accelerator resumes operation. Small-angle scattering calculations have included hydrogen gas- stripping, plasma-stripping, and photodetachment. Calculations indicate that the root mean square angular spread of a 390-MeV negative triton (T$sup -$) beam stripped in a plasma stripper may be as low as 0.7 $mu$rad. (auth)
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- NSA Number:
- NSA-33-024272
- OSTI ID:
- 4055403
- Report Number(s):
- LA-6019
- Resource Relation:
- Other Information: Orig. Receipt Date: 30-JUN-76
- Country of Publication:
- United States
- Language:
- English
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Ion & Molecular Beams & Reactions
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640301* -Physics Research-Atomic
Molecular & Chemical Physics-Beams & Their Reactions
*CESIUM- ION-ATOM COLLISIONS
*HYDROGEN IONS 1 MINUS- ION-MOLECULE COLLISIONS
*HYDROGEN- ION-MOLECULE COLLISIONS
*TRITIUM IONS- ION-MOLECULE COLLISIONS
BEAM PRODUCTION
CHARGE EXCHANGE
ION BEAMS
MEV RANGE 01-10
MEV RANGE 100-1000
PERFORMANCE
STRIPPING