The impact of plasma dynamics on the self-magnetic-pinch diode impedance

Bennett, Nichelle; Crain, M. Dale; Droemer, Darryl W.; Gignac, Raymond E.; Molina, Isidro; Obregon, Robert; Smith, Chase C.; Wilkins, Frank L.; Welch, Dale Robert; Cordova, Steve; Johnston, Mark D.; Kiefer, Mark L.; Leckbee, Joshua J.; Mazarakis, Michael G.; Nielsen, Dan S.; Romero, Tobias; Simpson, Sean; Webb, Timothy Jay; Ziska, Derek

doi:10.1063/1.4916062

Title: The impact of plasma dynamics on the self-magnetic-pinch diode impedance

Journal Article · Fri Mar 20 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4916062· OSTI ID:1235342

Bennett, Nichelle ^[1]; Crain, M. Dale ^[1]; Droemer, Darryl W. ^[1]; Gignac, Raymond E. ^[1]; Molina, Isidro ^[1]; Obregon, Robert ^[1]; Smith, Chase C. ^[1]; Wilkins, Frank L. ^[1]; Welch, Dale Robert ^[2]; Cordova, Steve ^[3]; Johnston, Mark D. ^[3]; Kiefer, Mark L. ^[3]; Leckbee, Joshua J. ^[3]; Mazarakis, Michael G. ^[3]; Nielsen, Dan S. ^[3]; Romero, Tobias ^[3]; Simpson, Sean ^[3]; Webb, Timothy Jay ^[3]; Ziska, Derek ^[3]

National Security Technologies, LLC, Las Vegas, NV (United States)
Voss Scientific, LLC, Albuquerque, NM (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

In this study, the self-magnetic-pinch diode is being developed as an intense electron beam source for pulsed-power-driven x-ray radiography. The basic operation of this diode has long been understood in the context of pinched diodes, including the dynamic effect that the diode impedance decreases during the pulse due to electrode plasma formation and expansion. Experiments being conducted at Sandia National Laboratories' RITS-6 accelerator are helping to characterize these plasmas using time-resolved and time-integrated camera systems in the x-ray and visible. These diagnostics are analyzed in conjunction with particle-in-cell simulations of anode plasma formation and evolution. The results confirm the long-standing theory of critical-current operation with the addition of a time-dependent anode-cathode gap length. Finally, the results may suggest that anomalous impedance collapse is driven by increased plasma radial drift, leading to larger-than-average ion v_r × B_θ acceleration into the gap.

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Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); National Security Technologies, LLC. (NSTec), Las Vegas, NV (United States); Sandia National Lab. (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; AC52-06NA25946

OSTI ID:: 1235342

Alternate ID(s):: OSTI ID: 1228566; OSTI ID: 1242535

Report Number(s):: SAND-2015-0768J; DOE/NV/25946-2277; PHPAEN; 562632

Journal Information:: Physics of Plasmas, Vol. 22, Issue 3; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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Cited By (2)

Contribution of the backstreaming ions to the self-magnetic pinch (SMP) diode current Mazarakis, Michael G.; Bennett, Nichelle; Cuneo, Michael E. Physics of Plasmas, Vol. 25, Issue 4 https://doi.org/10.1063/1.5009014	journal	April 2018
Zeeman spectroscopy as a method for determining the magnetic field distribution in self-magnetic-pinch diodes (invited) Patel, S. G.; Johnston, M. D.; Webb, T. J. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5039386	journal	October 2018

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