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- W138047294 abstract "Conversion of high energy light negative ions into neutrals due to collisions with plasma electrons and ions can be very efficient (85)percent) for H/sup )minus/)D/sup )minus/) and > 60)percent) for Li/sup )minus/)). For negative ions above 1 MeV, the presence of gases and ions heavier than protons in a neutralizer dramatically reduces neutralization efficiencies, especially those of heavier negative ions (e.g., Li/sup )minus/), C/sup )minus/), Si/sup )minus/)). Consequently, our neutralizer studies were focused on generation of hydrogen plasma targets. As a plasma source, the hollow cathode discharge (HCD) proved to be optimal due to its flexibility and steady-state generation of a high density, highly ionized plasma. Plasma targets in a number of configurations were generated with a power consumption well over an order of magnitude lower than other plasma targets. A full-scale plasma neutralizer was successfully built and deployed in a beam line of the BNL Tandem Van de Graaff to neutralize multi-MeV beams of Li/sup )minus/), C/sup )minus/), and Si/sup )minus/). Another plasma neutralizer was designed for the 1-2 A, 160 keV steady state D/sup )minus/) LBL (National Plan) beam line. Preliminary experiments to generate field-free plasma targets were performed. Studies were done with three confinement configurations: multi-cusp, doublemore » helix, and quartz tube. In the multi-cusp and double helix cases, confinement is provided by a magnetic field which is large at the plasma boundary with vanishing strength in the target itself. The third scheme utilized a quartz tube, i.e., the confinement is electrostatic by a charged insulator, with electrostatic field vanishing in a few Debye lengths. 11 refs., 2 figs., 2 tabs« less" @default.
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- W138047294 date "1988-01-01" @default.
- W138047294 modified "2023-09-27" @default.
- W138047294 title "Plasma neutralizer work at BNL (Brookhaven National Laboratory)" @default.
- W138047294 hasPublicationYear "1988" @default.
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