DEVELOPMENT WORK ON H**- ION SOURCES
A modified magnetic multipole ion source has been used to investigate the production of H ions both on a cesiated converter electrode and in a plasma volume. Using the cesiated converter an H ion beam of more than 70 mA has been extracted in continuous operation out of an extraction hole of 13 mm diameter at voltages up to 30 kV. Simultaneously less than 2% electrons have been accelerated. The divergence of the extracted ion beam was measured to be +- 22 mrad. A remarkably high gas efficiency of 20% has been achieved. Based on the results a multiconverter source with a multiaperture extraction system for currents up to 1 A has been designed and is under construction. Measurements on a cesium-free H volume source resulted in an ion current density of 3 mA/cm**2 at a discharge current of 20 A. The ratio of the simultaneously extracted electrons to negative ions was less than 3.
Bibliographic Reference: 4TH INTERNATIONAL SYMPOSIUM ON HEATING IN TOROIDAL PLASMAS, ROMA (ITALY), MARCH 21-28, 1984 VOL. II, PP. 1087-1093 1478 P., VOL. I AND VOL. II, 1984 WRITE TO MONOTYPIA FRANCHI, ST. LUCIA - VIALE UMBRIA NO. 28, 06012 CITTA DI CASTELLO, PERUGIA (ITALY), PRI
Record Number: 1989124041300 / Last updated on: 1987-01-01
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