Role of initial conditions in plasma-current coupling of gas-puff Z-pinches

Aybar, N.; Conti, F.; Narkis, J.; Beg, F. N.

doi:10.1063/5.0146565

Role of initial conditions in plasma-current coupling of gas-puff Z-pinches

Journal Article · Thu Jun 08 00:00:00 EDT 2023 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0146565· OSTI ID:2008199

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University of California San Diego, La Jolla, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
University of California San Diego, La Jolla, CA (United States); General Atomics, San Diego CA (United States)
University of California San Diego, La Jolla, CA (United States)

Azimuthal magnetic field measurements obtained during the implosion phase of an oxygen gas-puff Z-pinch on a 500 kA peak current and 180 ns rise time linear transformer driver are presented. While a fraction of the driver current was measured within the imploding plasma, key initial conditions were found to significantly impact the delivery of current to the plasma load. The electrode geometry was modified to assist the initial dielectric breakdown and resulted in improved shot reproducibility. Optimization of the gas injection plenum pressure and timing resulted in an increase in the current coupling parameter, defined as the ratio of the measured value of $$B$$_$$θ$$ to the expected value, from 50% to 75%. Furthermore, the degree of radial expansion of the gas puff in the load region, which is suspected to lead to the observed current loss during the implosion, was reduced by shortening the valve opening duration. Additionally, a pre-embedded axial magnetic field of up to 0.2 T was found to have no significant impact on the plasma-current coupling of the oxygen implosions.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)

Grant/Contract Number:: AC52-07NA27344; SC0019234; NA0003842

OSTI ID:: 2008199

Report Number(s):: LLNL--JRNL-845161; 1068398

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 6 Vol. 30; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Role of initial conditions in plasma-current coupling of gas-puff Z-pinches

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