Low-inductance, dual-feed diode development

Conference · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5717514

Hedemann, M A; Stark, M A; Reilly, J P; Spence, P W; Kishi, H

We have tested three low-inductance, sub-ohm impedance diode configurations on the SNLA SPEED pulse generator at power levels above 1 TW. SPEED is a single module, approx. = 20 nsec FWHM accelerator with a .4 ohm triaxial power flow transmission line in the water section and a double-sided vacuum-water insulator at a radius of 53 cm. In these experiments, the dual feed was continued with a triplate disk arrangement down to a diode radius of 4 cm, resulting in a load inductance of 5 nH. The diodes were configured to operate in a Langmuir-Childe's bipolar mode, a paravector potential mode, and a double pinched beam mode. We observed pulses with V = 900 kV, I = 1.5 MA, and pulse width = 19 nsec FWHM at the diode. Diode impedance was governed by plasma gap closure; closure velocities of approx. 7 cm/..mu..sec can be inferred from the data. In addition, a 4 nsec difference in the arrival time of the waves at the diode from the two feed lines was found to significantly perturb the expected diode performance. Diode performance improved markedly when the two feed lines were isolated from each other.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA); Pulse Sciences, Inc., San Leandro, CA (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5717514
• Report Number(s): SAND-83-0223C; CONF-830911-16; ON: DE84000117
• Country of Publication: United States
• Language: English

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