Axial mass fraction measurements in a 300kA dense plasma focus
Abstract
The dynamics and characteristics of the plasma sheath during the axial phase in a ~300 kA, ~2 kJ dense plasma focus using a static gas load of Ne at 1–4 Torr are reported. The sheath, which is driven axially at a constant velocity ~105 m/s by the j × B force, is observed using optical imaging, to form an acute angle between the electrodes. This angle becomes more acute (more parallel to the axis) along the rundown. The average sheath thickness nearer the anode is 0.69 ± 0.02 mm and nearer the cathode is 0.95 ± 0.02 mm. The sheath total mass increases from 1 ± 0.02 μg to 6 ± 0.02 μg over the pressure range of 1–4 Torr. However, the mass fraction (defined as the sheath mass/total mass of cold gas between the electrodes) decreases from 7% to 5%. In addition, the steeper the plasma sheath, the more mass is lost from the sheath, which is consistent with radial and axial motion. Lastly, experimental results are compared to the Lee code when 100% of the current drives the axial and radial phase.
- Authors:
-
[3];
- Univ. of California, San Diego, CA (United States). Center for Energy Research
- Alameda Applied Sciences Corporation, San Leandro, CA (United States)
- Evergreen Hill Sciences, Philomath, OR (United States)
- Imperial College London, South Kensington, London (United Kingdom)
- Publication Date:
- Research Org.:
- Univ. of California, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1467900
- Alternate Identifier(s):
- OSTI ID: 1325303
- Grant/Contract Number:
- SC0010751
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 23; Journal Issue: 9; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Caballero Bendixsen, L. S., Bott-Suzuki, S. C., Cordaro, S. W., Krishnan, M., Chapman, S., Coleman, P., and Chittenden, J. Axial mass fraction measurements in a 300kA dense plasma focus. United States: N. p., 2016.
Web. doi:10.1063/1.4962679.
Caballero Bendixsen, L. S., Bott-Suzuki, S. C., Cordaro, S. W., Krishnan, M., Chapman, S., Coleman, P., & Chittenden, J. Axial mass fraction measurements in a 300kA dense plasma focus. United States. https://doi.org/10.1063/1.4962679
Caballero Bendixsen, L. S., Bott-Suzuki, S. C., Cordaro, S. W., Krishnan, M., Chapman, S., Coleman, P., and Chittenden, J. Fri .
"Axial mass fraction measurements in a 300kA dense plasma focus". United States. https://doi.org/10.1063/1.4962679. https://www.osti.gov/servlets/purl/1467900.
@article{osti_1467900,
title = {Axial mass fraction measurements in a 300kA dense plasma focus},
author = {Caballero Bendixsen, L. S. and Bott-Suzuki, S. C. and Cordaro, S. W. and Krishnan, M. and Chapman, S. and Coleman, P. and Chittenden, J.},
abstractNote = {The dynamics and characteristics of the plasma sheath during the axial phase in a ~300 kA, ~2 kJ dense plasma focus using a static gas load of Ne at 1–4 Torr are reported. The sheath, which is driven axially at a constant velocity ~105 m/s by the j × B force, is observed using optical imaging, to form an acute angle between the electrodes. This angle becomes more acute (more parallel to the axis) along the rundown. The average sheath thickness nearer the anode is 0.69 ± 0.02 mm and nearer the cathode is 0.95 ± 0.02 mm. The sheath total mass increases from 1 ± 0.02 μg to 6 ± 0.02 μg over the pressure range of 1–4 Torr. However, the mass fraction (defined as the sheath mass/total mass of cold gas between the electrodes) decreases from 7% to 5%. In addition, the steeper the plasma sheath, the more mass is lost from the sheath, which is consistent with radial and axial motion. Lastly, experimental results are compared to the Lee code when 100% of the current drives the axial and radial phase.},
doi = {10.1063/1.4962679},
journal = {Physics of Plasmas},
number = 9,
volume = 23,
place = {United States},
year = {Fri Sep 16 00:00:00 EDT 2016},
month = {Fri Sep 16 00:00:00 EDT 2016}
}
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journal, November 2018
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- Physics of Plasmas, Vol. 25, Issue 11