Time-resolved voltage measurements of Z-pinch radiation sources with a vacuum voltmeter

Murphy, D.P.; Allen, R.J.; Weber, B.V.; Commisso, R.J.; Apruzese, J. P.; Phipps, D.G.; Mosher, D.

doi:10.1063/1.2956829

Cited by 25 publications

(11 citation statements)

References 2 publications

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“…(1)-(3), the measured dI/dt and the voltage values, the radius and velocity of the imploding plasma can be calculated. 33,34 In Case A (Fig. 26, pulse #2780), the IdL/dt voltage peaked at 180 kV, when the mean plasma radius was about 0.3 cm and the current was 0.8 MA.…”

Section: Current Waveform Effects On the Implosion Dynamicsmentioning

confidence: 97%

Study of gas-puff Z-pinches on COBRA

Rosenberg

Gourdain

et al. 2014

Physics of Plasmas

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Gas-puff Z-pinch experiments were conducted on the 1 MA, 200 ns pulse duration Cornell Beam Research Accelerator (COBRA) pulsed power generator in order to achieve an understanding of the dynamics and instability development in the imploding and stagnating plasma. The triplenozzle gas-puff valve, pre-ionizer, and load hardware are described. Specific diagnostics for the gas-puff experiments, including a Planar Laser Induced Fluorescence system for measuring the radial neutral density profiles along with a Laser Shearing Interferometer and Laser Wavefront Analyzer for electron density measurements, are also described. The results of a series of experiments using two annular argon (Ar) and/or neon (Ne) gas shells (puff-on-puff) with or without an on-(or near-) axis wire are presented. For all of these experiments, plenum pressures were adjusted to hold the radial mass density profile as similar as possible. Initial implosion stability studies were performed using various combinations of the heavier (Ar) and lighter (Ne) gasses. Implosions with Ne in the outer shell and Ar in the inner were more stable than the opposite arrangement. Current waveforms can be adjusted on COBRA and it was found that the particular shape of the 200 ns current pulse affected on the duration and diameter of the stagnated pinched column and the x-ray yield. V C 2014 AIP Publishing LLC. [http://dx.

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Section: Current Waveform Effects On the Implosion Dynamicsmentioning

confidence: 97%

Study of gas-puff Z-pinches on COBRA

Rosenberg

Gourdain

et al. 2014

Physics of Plasmas

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“…Inductance measurements yield insight on pinch timing and strength, and can improve measurements of effective current-carrying pinch-column radius compared to laser shadowgraphy alone. Previous such methods [53][54][55] required an additional measurement of voltage, which is more difficult to obtain than a measurement of current alone.…”

Section: Conclusion and Suggestions For Future Workmentioning

confidence: 99%

“…Previous measurements of inductance obtained from simultaneous voltage and current measurements on wire array implosions on Z[53] were able to obtain information on the timing of wire core motion and effective radius. Additionally, voltage and current measurements of gas puff Z-pinches on Saturn were used to calculate time-dependent inductance and energy coupled into the load, assuming negligible load resistance[54,55]. These techniques assume that load inductance is dominant over resistance, and compute inductance fromMeasuring voltage on an LTD can prove difficult because the inductive isolation of the outer case from the transmission line often leads to ground loops when voltage divider probes are employed, and attempts to field differential D-dot probes [40] were complicated by the presence of electron flow in the MITL.…”

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confidence: 99%

The Electrothermal Instability on Pulsed Power Ablations of Thin Foils

Steiner

Campbell

Yager-Elorriaga

et al. 2018

IEEE Trans. Plasma Sci.

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email to discuss past research and ideas for new experiments. Particular thanks go to Dr. Jacob Zier, a former graduate student in our lab who attempted the daunting task of teaching me how to run the LTD in only six months as he wrote his own dissertation. Thanks also go to Dr. Matthew Gomez, whom I also briefly overlapped with as a graduate student and who has provided advice on numerous occasions. Mark Perrault provided indispensable support to my research as our lab electrician, machinist, and safety officer; he will be pleasantly surprised to learn I still have two functional legs despite the number of times I wore shorts to the lab. A very special thank you goes to Professor Steven Shannon of North Carolina State University, who brought me into his lab as an undergraduate, ignited my passion for plasma physics, and introduced me to Professor Gilgenbach at a conference. Perhaps the most indispensable contributors to the day-today research required for this thesis were my fellow graduate students, who are all both colleagues and close friends. Dr. Sonal Patel is both a brilliant scientist and everyone's favorite random word generator. David Yager-Elorriaga and I looked out for each other's sanity as we learned how much fun a full LTD rebuild can be. Steven Exelby invigorates everyone who works in our lab with his burning passion for social justice. Paul Campbell, although he arrived late into my grad school career, was pretty much the only reason I was able to finish collecting data while frantically writing my thesis as the deadline loomed over me. It has also been a great privilege to get to know and work with Geoff Greening. I also thank the students of Professor Lau, particularly Professor Peng

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“…There are several reported voltage measurements from the pinch devices using circuit-based voltage probes [4][5][6][7]. In [4], the positions of the voltage measurements are distant from the load of the pinch devices, and even when the measurement location is near the load [5,6], the measured voltage is strongly coupled to the time derivative of the current of the pinch device due to the non-negligible inductance of the probe itself.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the voltage evolution on a load of X-pinch plasma system using the Pockels effect

Choi,

Ham,

Ryu

et al. 2023

J. Inst.

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A diagnostic system using the Pockels effect (linear electro-optic effect) has been developed to measure a voltage on a load of the SNU X-pinch device [Ryu et al., Rev. Sci. Instrum. 92, 053533 (2021)]. The sensor component of the diagnostic system comprises of a lithium niobate (LN) crystal and its mount. When the LN crystal is subjected to an external electric field, the refractive indices of the LN crystal change due to the Pockels effect, leading to a change in the polarization state of the propagating laser beam through the crystal. This concept allows the separation and shielding of electronic devices from the intense electric pulses generated by the X-pinch system. Furthermore, the compact size and high electric field tolerance of the LN crystal enable us to position the sensor in a close proximity to the load of the X-pinch, facilitating the measurement of voltage evolution on the load. In contrast to circuit-based voltage probes, our sensor possesses low inductance, allowing us to measure resistive-dominant voltage even in the presence of rapid current changes within the X-pinch system. In this paper, we outline the configuration of our voltage measurement system using the LN crystal within the X-pinch device and provide measurement results of the load voltage. Additionally, we explore the temporal evolution of the voltage in relation to the phase transition of the load.

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Time-resolved voltage measurements of Z-pinch radiation sources with a vacuum voltmeter

Cited by 25 publications

References 2 publications

Study of gas-puff Z-pinches on COBRA

Study of gas-puff Z-pinches on COBRA

The Electrothermal Instability on Pulsed Power Ablations of Thin Foils

Measurement of the voltage evolution on a load of X-pinch plasma system using the Pockels effect

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