Mega-ampere submicrosecond generator GIT-32

B. M. Kovalchuk, A. V. Kharlov, V. N. Kiselev, E. V. Kumpyak, V. B. Zorin, V. V. Chupin, A. V. Morozov

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    Abstract

    The GIT-32 current generator was developed for experiments with current carrying pulsed plasma. The main parts of the generator are capacitor bank, multichannel multigap spark switches, low inductive current driving lines, and central load part. The generator consists of four identical sections, connected in parallel to one load. The capacitor bank is assembled from 32 IEK-100-0.17 (0.17 μF, 40 nH, 100 kV) capacitors, connected in parallel. It stores -18 kJ at 80 kV charging voltage. Each two capacitors are commuted to a load by a multigap spark switch with eight parallel channels. Switches operate in ambient air at atmospheric pressure. The GIT-32 generator was tested with 10, 15, and 20 nH inductive loads. At 10 nH load and 80 kV of charging voltage it provides 1 MA of current amplitude and 490 ns rise time with 0.8 Ω damping resistors in discharge circuit of each capacitor and 1.34 MA/530 ns without resistors. The net generator inductance without a load was optimized to be as low as 12 nH, which results in extremely low self-impedance of the generator (∼0.05 Ω). It ensures effective energy coupling with low impedance loads like Z pinch. The generator operates reliably without any adjustments in 40-80 kV range of charging voltage. Maximum jitter (relative to a triggering pulse) at 40 kV charging voltage is about 7 ns and lower at higher charging voltages. Operation and handling are very simple, because no oil and no purified gases are required for the generator. The GIT-32 generator has dimensions of 3200 × 3200 × 400 mm3 and total weight of about 2500 kg, thus manifesting itself as a simple, robust, and cost effective apparatus.

    Original languageEnglish
    Article number033501
    JournalReview of Scientific Instruments
    Volume78
    Issue number3
    DOIs
    Publication statusPublished - 8 Apr 2007

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    ASJC Scopus subject areas

    • Instrumentation

    Cite this

    Kovalchuk, B. M., Kharlov, A. V., Kiselev, V. N., Kumpyak, E. V., Zorin, V. B., Chupin, V. V., & Morozov, A. V. (2007). Mega-ampere submicrosecond generator GIT-32. Review of Scientific Instruments, 78(3), [033501]. https://doi.org/10.1063/1.2712800