The RADLAC-II module accelerator double pulse experiments

Technical Report · Wed Jun 01 04:00:00 EDT 1988

OSTI ID:7198065

Smith, David L; Mazarakis, Michael G; Jones, Edwin E

The RADLAC-II Module(RIIM) accelerator was converted to a double- pulse machine with a foilless-diode load. The injector performance was evaluated in the double-pulse mode for pulse separations less than 2 ms. Two different pulsed power configurations were used to compare two voltage regimes and the pulse-to-pulse coupling conditions. The higher voltage pulsed power configuration produced first-pulse electron beam parameters of 4 MeV, 20-30 kA, and 40 ns FWHM. The second pulse from the lower voltage configuration suffered much less jitter and inductive losses than the second pulse for the higher voltage case. In both cases, a gas phenomenon appeared to inhibit the generation of a second electron beam. The generated plasma and excessive neutral gas release inside the injector followed the first pulse and prevented the diode from producing a second beam pulse for interpulse separations larger than one microsecond. Prior to this ''cut-off'' time the lower voltage configuration did produce a second electron beam pulse of about 10 kA, similar to that of its first pulse. This report summarizes all the major results of the RIIM double- pulse experiments. The primary areas of interest and discussion include: first pulse performance, first pulse coupling and interference with the second pulse water switches, second pulse water switch jitter, additional losses of the second pulse, and injector plasma/gas interference with the second pulse. The restrictive range of operation we found for this injector should inspire research into alternative geometries, materials, and pumping techniques. 14 refs., 26 figs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 7198065
• Report Number(s): SAND-88-1158; ON: DE88012746
• Country of Publication: United States
• Language: English

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