Journal
IEEE TRANSACTIONS ON PLASMA SCIENCE
Volume 50, Issue 9, Pages 2541-2547Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPS.2022.3198385
Keywords
Magnetic field measurement; plasma pinch; pulsed power systems
Categories
Funding
- Department of Energy Office of Science [DE-SC0019234]
- National Nuclear Security Administration (NNSA) [DE NA0003842]
- U.S. Department of Energy (DOE) [DE-SC0019234] Funding Source: U.S. Department of Energy (DOE)
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Experiments were conducted to measure the azimuthal magnetic field of gas-puff Z-pinch implosions on two drivers with significantly different timescales. A spectroscopic technique based on the Zeeman effect was used to compare the measurements of Be with calculated values using Ampere's law. The results showed that the plasma-current coupling was substantially lower in implosions on the compact experimental system for Z-pinch and ablation research (CESZAR) linear transformer driver (LTD) compared to implosions on the Weizmann Institute of Science (WIS) current driver.
Experiments measuring the azimuthal magnetic field of gas-puff Z-pinch implosions on two drivers of significantly different timescales are presented. Using a Zeeman-based spectroscopic technique, measurements of Be are compared with calculated values using Ampere's law and the load current measured by inductive probes to define the plasma-current coupling. Oxygen gas-puff implosions carried out on the compact experimental system for Z-pinch and ablation research (CESZAR) linear transformer driver (LTD) with a peak current of similar to 500-kA and similar to 180-ns rise time exhibited substantially lower plasma-current coupling when compared to implosions on the Weizmann Institute of Science (WIS) current driver (300-kA peak and 1600-ns rise), 48% +/- 18% and 95% +/- 6%, respectively. Potential causes for the significant differences in plasma-current coupling between the two drivers are examined. Shunted current across instability structures present in the CESZAR implosions is ruled out as a source of current loss. The radial charge state distribution is discussed, and a trailing plasma composed of higher charge states is hypothesized to carry a significant portion of the driver current.
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