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Title: MA-class linear transformer driver for Z -pinch research

Abstract

A linear transformer driver (LTD) generator capable of delivering up to 0.9 MA current pulses with 160 ns rise time has been assembled and commissioned at University of California San Diego. The machine is an upgrade of the LTD-III pulser from Sandia National Laboratories, consisting of 40 capacitors and 20 spark gap switches, arranged in a 20-brick configuration. The driver was modified with the addition of a new trigger system, active premagnetization of the inductive cores, a vacuum chamber with multiple diagnostic ports, and a vacuum power feed to couple the driver to plasma loads. The new machine is called compact experimental system for Z-pinch and ablation research (CESZAR). The driver has a maximum bipolar charge voltage of ±100 kV, but for reliability and testing, and to reduce the risk of damage to components, the machine was operated at ±60 kV, producing 550 kA peak currents with a rise time of 170 ns on a 3.5 nH short circuit. While the peak current is scaled down due to the reduced charge voltage, the pulse shape and circuit parameters are close to the results of the cavity and power feed models but suggest a slightly higher inductance than predicted. The machinemore » was then used to drive wire array Z-pinch and gas puff Z-pinch experiments as initial dynamic plasma loads. The evolution of the wire array Z pinch is consistent with the general knowledge of this kind of experiment, featuring wire ablation and stagnation of the precursor plasma on axis. The gas puff Z pinches were configured as a single, hollow argon gas shell, in preparation for more structured gas puff targets such as multispecies, multishell implosions. The implosion dynamics agree generally with 1D magnetohydrodynamics simulation results, but large zippering and magneto-Rayleigh-Taylor instabilities are observed. The CESZAR load region was designed to accommodate many load types to be driven by the machine, which makes it a versatile platform for studying Z-pinch plasmas. The completion of the CESZAR driver allows plasma experiments on energy coupling from LTD machines to plasma loads, instability mitigation techniques and magnetic field distributions in Z pinches, and interface dynamics in multispecies implosions.« less

Authors:
ORCiD logo; ; ; ; ; ; ; ORCiD logo; ; ORCiD logo;
Publication Date:
Research Org.:
Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); US Air Force Office of Scientific Research (AFOSR)
OSTI Identifier:
1668116
Alternate Identifier(s):
OSTI ID: 1784741
Grant/Contract Number:  
NA0003842; FS9550-18-1-0384
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Accelerators and Beams Journal Volume: 23 Journal Issue: 9; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Conti, F., Valenzuela, J. C., Fadeev, V., Aybar, N., Reisman, D. B., Williams, A., Collins, G., Narkis, J., Ross, M. P., Beg, F. N., and Spielman, R. B. MA-class linear transformer driver for Z -pinch research. United States: N. p., 2020. Web. https://doi.org/10.1103/PhysRevAccelBeams.23.090401.
Conti, F., Valenzuela, J. C., Fadeev, V., Aybar, N., Reisman, D. B., Williams, A., Collins, G., Narkis, J., Ross, M. P., Beg, F. N., & Spielman, R. B. MA-class linear transformer driver for Z -pinch research. United States. https://doi.org/10.1103/PhysRevAccelBeams.23.090401
Conti, F., Valenzuela, J. C., Fadeev, V., Aybar, N., Reisman, D. B., Williams, A., Collins, G., Narkis, J., Ross, M. P., Beg, F. N., and Spielman, R. B. Mon . "MA-class linear transformer driver for Z -pinch research". United States. https://doi.org/10.1103/PhysRevAccelBeams.23.090401.
@article{osti_1668116,
title = {MA-class linear transformer driver for Z -pinch research},
author = {Conti, F. and Valenzuela, J. C. and Fadeev, V. and Aybar, N. and Reisman, D. B. and Williams, A. and Collins, G. and Narkis, J. and Ross, M. P. and Beg, F. N. and Spielman, R. B.},
abstractNote = {A linear transformer driver (LTD) generator capable of delivering up to 0.9 MA current pulses with 160 ns rise time has been assembled and commissioned at University of California San Diego. The machine is an upgrade of the LTD-III pulser from Sandia National Laboratories, consisting of 40 capacitors and 20 spark gap switches, arranged in a 20-brick configuration. The driver was modified with the addition of a new trigger system, active premagnetization of the inductive cores, a vacuum chamber with multiple diagnostic ports, and a vacuum power feed to couple the driver to plasma loads. The new machine is called compact experimental system for Z-pinch and ablation research (CESZAR). The driver has a maximum bipolar charge voltage of ±100 kV, but for reliability and testing, and to reduce the risk of damage to components, the machine was operated at ±60 kV, producing 550 kA peak currents with a rise time of 170 ns on a 3.5 nH short circuit. While the peak current is scaled down due to the reduced charge voltage, the pulse shape and circuit parameters are close to the results of the cavity and power feed models but suggest a slightly higher inductance than predicted. The machine was then used to drive wire array Z-pinch and gas puff Z-pinch experiments as initial dynamic plasma loads. The evolution of the wire array Z pinch is consistent with the general knowledge of this kind of experiment, featuring wire ablation and stagnation of the precursor plasma on axis. The gas puff Z pinches were configured as a single, hollow argon gas shell, in preparation for more structured gas puff targets such as multispecies, multishell implosions. The implosion dynamics agree generally with 1D magnetohydrodynamics simulation results, but large zippering and magneto-Rayleigh-Taylor instabilities are observed. The CESZAR load region was designed to accommodate many load types to be driven by the machine, which makes it a versatile platform for studying Z-pinch plasmas. The completion of the CESZAR driver allows plasma experiments on energy coupling from LTD machines to plasma loads, instability mitigation techniques and magnetic field distributions in Z pinches, and interface dynamics in multispecies implosions.},
doi = {10.1103/PhysRevAccelBeams.23.090401},
journal = {Physical Review Accelerators and Beams},
number = 9,
volume = 23,
place = {United States},
year = {2020},
month = {9}
}

Journal Article:
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