Studies of the hollow discharge duoplasmatron as a source of H/sup -/ ions
A parametric study was made of the pulsed hollow discharge duoplasmatron, operating as a negative hydrogen ion source in the pure hydrogen mode and in the mixed hydrogen--cesium mode. Effects of the arc current, gas pressure, and the magnetic field on the extracted H/sup -/ current were investigated for different electrode geometries and potentials. In the hydrogen mode a maximum H/sup -/ beam current of 11 mA was obtained from an anode extraction aperture of 2.45-mm diameter, with a normalized emittance of 0.1..pi.. cm mrad. In the mixed hydrogen--cesium mode an H/sup -/ beam current of 60 mA was obtained from the same aperture. At a current of 40 mA the normalized emittance was 0.23..pi.. cm mrad. An analysis of the results points to the volume production of H/sup -/ ions in the hydrogen mode and to the surface production in the hydrogen--cesium mode. (AIP)
- Research Organization:
- National Laboratory for High Energy Physics, Oho-Machi, Tsukuba-Gun, Ibaraki-Ken 300-32, Japan
- OSTI ID:
- 7330439
- Journal Information:
- Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 47:12; ISSN RSINA
- Country of Publication:
- United States
- Language:
- English
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