PFMA-1 is a 150 kJ, 40 nH Mather-type plasma focus designed for repetition frequencies up to 1 Hz and dedicated to the neutron-free endogenous production of F-18. PFMA-1 utilizes 32 capacitors, 11.1 µF each, charged in parallel at 30 kV. Snowplow calculations predict a 1.5 MA peak current and a 2.5 µs quarter-period for this device. To achieve low inductance and high peak current, one spark gap and four coaxial cables are employed per capacitor. Field-distortion, swing-cascade spark gaps were developed by R. E. Beverly III & Associates for this application (model SG-183). These switches mount directly onto the capacitor's modified Scyllac-type bushing and are enclosed by a low-inductance grounded shield. The rated peak current is 160 kA, the maximum charge transferred is ca. 0.4 C/shot, the self-inductance is 26 nH, and the breakdown jitter is ca. 1 ns at 30 kV and 60 kPa dry air. The switches are cooled by a combination of deionized water, SF6 and dry air. The estimated electrode lifetime is ca. 0.1 Mshots. Special B-dot probes within each switch canister monitor the discharge of every capacitor. Simultaneous triggering of all capacitors is accomplished by a 32-channel PFL generator. Some experimental results and waveforms obtained during preliminary testing of the facility are presented and compared with design values.

F. Rocchi, S. Mannucci, D. Mostacci, M. Sumini, E. Angeli, A. Tartari, et al. (2007). PFMA-1: a 1-Hz, 150-kJ pulsed power system for plasma focus generation. PISCATAWAY (NJ), USA : IEEE.

PFMA-1: a 1-Hz, 150-kJ pulsed power system for plasma focus generation

MOSTACCI, DOMIZIANO;SUMINI, MARCO;
2007

Abstract

PFMA-1 is a 150 kJ, 40 nH Mather-type plasma focus designed for repetition frequencies up to 1 Hz and dedicated to the neutron-free endogenous production of F-18. PFMA-1 utilizes 32 capacitors, 11.1 µF each, charged in parallel at 30 kV. Snowplow calculations predict a 1.5 MA peak current and a 2.5 µs quarter-period for this device. To achieve low inductance and high peak current, one spark gap and four coaxial cables are employed per capacitor. Field-distortion, swing-cascade spark gaps were developed by R. E. Beverly III & Associates for this application (model SG-183). These switches mount directly onto the capacitor's modified Scyllac-type bushing and are enclosed by a low-inductance grounded shield. The rated peak current is 160 kA, the maximum charge transferred is ca. 0.4 C/shot, the self-inductance is 26 nH, and the breakdown jitter is ca. 1 ns at 30 kV and 60 kPa dry air. The switches are cooled by a combination of deionized water, SF6 and dry air. The estimated electrode lifetime is ca. 0.1 Mshots. Special B-dot probes within each switch canister monitor the discharge of every capacitor. Simultaneous triggering of all capacitors is accomplished by a 32-channel PFL generator. Some experimental results and waveforms obtained during preliminary testing of the facility are presented and compared with design values.
2007
16th IEEE Pulsed Power Conference Proceedings
857
860
F. Rocchi, S. Mannucci, D. Mostacci, M. Sumini, E. Angeli, A. Tartari, et al. (2007). PFMA-1: a 1-Hz, 150-kJ pulsed power system for plasma focus generation. PISCATAWAY (NJ), USA : IEEE.
F. Rocchi; S. Mannucci; D. Mostacci; M. Sumini; E. Angeli; A. Tartari; R. E. Beverly
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/50074
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