The impact of plasma dynamics on the self-magnetic-pinch diode impedance
- 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 vr × Bθ acceleration into the gap.
- 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
Web of Science
Contribution of the backstreaming ions to the self-magnetic pinch (SMP) diode current
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journal | April 2018 |
Zeeman spectroscopy as a method for determining the magnetic field distribution in self-magnetic-pinch diodes (invited)
|
journal | October 2018 |
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