ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
An intensive study has been made at DESY of the transition region between the plasma and vacuum, the so-called sheath, of rf sources for negative hydrogen ions. The plasma and sheath have been analyzed with Langmuir probes even at extraction at 35 kV, with different geometric arrangements utilizing specially designed collars. Langmuir probes were installed in one of the collars. The use of a long ceramic insulated Langmuir probe made a three-dimensional analysis possible. The density, temperature, and potential of the plasma have been calculated based on these data. These studies have resulted in a better understanding of the transition region of not just rf sources but also of magnetron and Penning sources. Studies with a nine-ring collar made it possible to develop a design with a new method to dump the electrons and deliver an increased negative hydrogen current. © 2002 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1427670
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