The BNL Volume H Sup Minus Ion Source

The BNL Volume H Sup Minus Ion Source
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Total Pages: 15
Release: 1989
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This paper is a progress report on the studies of the BNL volume H− ion source. We have measured the H− yield, I{sub H}−, and the ratio I{sub e}/I{sub H}− as function of the size of the extraction aperture, strength of the conical filter field, size and position of the filament, and of the phase of the filament heating current. The H− current density in the extraction aperture was lower for the largest aperture, while there was a broad maximum when the conical field varied. Position of the filament and the phase of the filament heating current are very important parameters. 5 refs., 10 figs., 1 tab.

The New BNL Polarized Negative Ion Source

The New BNL Polarized Negative Ion Source
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Total Pages: 10
Release: 1991
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A new ground state source of negative hydrogen ions with polarized nuclei ({rvec H}−) is being developed at BNL. Extensive developmental research has been aimed at improving each element of ({rvec H}−) production: cold H° beam, spin selection and focusing magnets, and ionizer. These elements have recently been integrated into a source. A first test with the accommodator nozzle cooled only to liquid nitrogen temperatures resulted in 5 [mu]A of H−. Tests at liquid helium temperatures are now beginning. 7 refs., 1 fig.