Current transport and loss mechanisms in the accelerator
Abstract
A challenge for the TW-class accelerators driving Z-pinch experiments, such as Sandia National Laboratories’ Z machine, is to efficiently couple power from multiple storage banks into a single multi-MA transmission line. The physical processes that lead to current loss are identified in new large-scale, multidimensional simulations of the Z machine. Kinetic models follow the range of physics occurring during a pulse, from vacuum pulse propagation to charged-particle emission and magnetically-insulated current flow to electrode plasma expansion. Simulations demonstrate that current is diverted from the load through a combination of standard transport (uninsulated charged-particle flows) and anomalous transport. Standard transport occurs in regions where the electrode current density is a few 104–105 A/cm2 and current is diverted from the load via transport without magnetic insulation. In regions with electrode current density >106 A/cm2, electrode surface plasmas develop velocity-shear instabilities and a Hall-field-related transport which scales with electron density and may, therefore, lead to increased current loss.
- Authors:
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1577926
- Alternate Identifier(s):
- OSTI ID: 1581983
- Report Number(s):
- SAND-2019-8407J
Journal ID: ISSN 2469-9888; PRABCJ; 120401
- Grant/Contract Number:
- NA0003525; 209240; AC04-94AL85000
- Resource Type:
- Published Article
- Journal Name:
- Physical Review Accelerators and Beams
- Additional Journal Information:
- Journal Name: Physical Review Accelerators and Beams Journal Volume: 22 Journal Issue: 12; Journal ID: ISSN 2469-9888
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS
Citation Formats
Bennett, N., Welch, D. R., Jennings, C. A., Yu, E., Hess, M. H., Hutsel, B. T., Laity, G., Moore, J. K., Rose, D. V., Peterson, K., and Cuneo, M. E. Current transport and loss mechanisms in the Z accelerator. United States: N. p., 2019.
Web. doi:10.1103/PhysRevAccelBeams.22.120401.
Bennett, N., Welch, D. R., Jennings, C. A., Yu, E., Hess, M. H., Hutsel, B. T., Laity, G., Moore, J. K., Rose, D. V., Peterson, K., & Cuneo, M. E. Current transport and loss mechanisms in the Z accelerator. United States. https://doi.org/10.1103/PhysRevAccelBeams.22.120401
Bennett, N., Welch, D. R., Jennings, C. A., Yu, E., Hess, M. H., Hutsel, B. T., Laity, G., Moore, J. K., Rose, D. V., Peterson, K., and Cuneo, M. E. Tue .
"Current transport and loss mechanisms in the Z accelerator". United States. https://doi.org/10.1103/PhysRevAccelBeams.22.120401.
@article{osti_1577926,
title = {Current transport and loss mechanisms in the Z accelerator},
author = {Bennett, N. and Welch, D. R. and Jennings, C. A. and Yu, E. and Hess, M. H. and Hutsel, B. T. and Laity, G. and Moore, J. K. and Rose, D. V. and Peterson, K. and Cuneo, M. E.},
abstractNote = {A challenge for the TW-class accelerators driving Z-pinch experiments, such as Sandia National Laboratories’ Z machine, is to efficiently couple power from multiple storage banks into a single multi-MA transmission line. The physical processes that lead to current loss are identified in new large-scale, multidimensional simulations of the Z machine. Kinetic models follow the range of physics occurring during a pulse, from vacuum pulse propagation to charged-particle emission and magnetically-insulated current flow to electrode plasma expansion. Simulations demonstrate that current is diverted from the load through a combination of standard transport (uninsulated charged-particle flows) and anomalous transport. Standard transport occurs in regions where the electrode current density is a few 104–105 A/cm2 and current is diverted from the load via transport without magnetic insulation. In regions with electrode current density >106 A/cm2, electrode surface plasmas develop velocity-shear instabilities and a Hall-field-related transport which scales with electron density and may, therefore, lead to increased current loss.},
doi = {10.1103/PhysRevAccelBeams.22.120401},
journal = {Physical Review Accelerators and Beams},
number = 12,
volume = 22,
place = {United States},
year = {Tue Dec 10 00:00:00 EST 2019},
month = {Tue Dec 10 00:00:00 EST 2019}
}
https://doi.org/10.1103/PhysRevAccelBeams.22.120401
Web of Science
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