Characteristic time for halo current growth and rotation
Abstract
We report a halo current flows for part of its path through the plasma edge and for part through the chamber walls and during tokamak disruptions can be as large as tenths of the plasma current. The primary interest in halo currents is the large force that they can exert on machine components particularly if the toriodal rotation of the halo current resonates with a natural oscillation frequency of the tokamak device. Halo currents arise when required to slow down the growth of a kink that is too unstable to be stabilized by the chamber walls. The width of the current channel in the halo plasma is comparable to the amplitude of the kink, and the halo current grows linearly, not exponentially, in time. The current density in the halo is comparable to that of the main plasma body. The rocket force due to plasma flowing out of the halo and recombining on the chamber walls can cause the non-axisymmetric magnetic structure produced by the kink to rotate toroidally at a speed compara-ble to the halo speed of sound. Lastly, Gerhardt’s observations of the halo current in NSTX shot 141 687 [Nucl. Fusion 53, 023005 (2013)] illustrate many features ofmore »
- Authors:
-
- Columbia Univ., New York, NY (United States). Department of Applied Physics and Applied Mathematics
- Publication Date:
- Research Org.:
- The Trustees Of Columbia University in The City Of New York Inc (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1469571
- Alternate Identifier(s):
- OSTI ID: 1224225
- Grant/Contract Number:
- FG02-03ER54696
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 22; Journal Issue: 10; 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
Boozer, Allen H. Characteristic time for halo current growth and rotation. United States: N. p., 2015.
Web. doi:10.1063/1.4933363.
Boozer, Allen H. Characteristic time for halo current growth and rotation. United States. https://doi.org/10.1063/1.4933363
Boozer, Allen H. Mon .
"Characteristic time for halo current growth and rotation". United States. https://doi.org/10.1063/1.4933363. https://www.osti.gov/servlets/purl/1469571.
@article{osti_1469571,
title = {Characteristic time for halo current growth and rotation},
author = {Boozer, Allen H.},
abstractNote = {We report a halo current flows for part of its path through the plasma edge and for part through the chamber walls and during tokamak disruptions can be as large as tenths of the plasma current. The primary interest in halo currents is the large force that they can exert on machine components particularly if the toriodal rotation of the halo current resonates with a natural oscillation frequency of the tokamak device. Halo currents arise when required to slow down the growth of a kink that is too unstable to be stabilized by the chamber walls. The width of the current channel in the halo plasma is comparable to the amplitude of the kink, and the halo current grows linearly, not exponentially, in time. The current density in the halo is comparable to that of the main plasma body. The rocket force due to plasma flowing out of the halo and recombining on the chamber walls can cause the non-axisymmetric magnetic structure produced by the kink to rotate toroidally at a speed compara-ble to the halo speed of sound. Lastly, Gerhardt’s observations of the halo current in NSTX shot 141 687 [Nucl. Fusion 53, 023005 (2013)] illustrate many features of the theory of halo currents and are discussed as a summary of the theory.},
doi = {10.1063/1.4933363},
journal = {Physics of Plasmas},
number = 10,
volume = 22,
place = {United States},
year = {Mon Oct 19 00:00:00 EDT 2015},
month = {Mon Oct 19 00:00:00 EDT 2015}
}
Free Publicly Available Full Text
Publisher's Version of Record
Other availability
Search WorldCat to find libraries that may hold this journal
Cited by: 6 works
Citation information provided by
Web of Science
Web of Science
Save to My Library
You must Sign In or Create an Account in order to save documents to your library.
Works referenced in this record:
Computation of three-dimensional tokamak and spherical torus equilibria
journal, May 2007
- Park, Jong-kyu; Boozer, Allen H.; Glasser, Alan H.
- Physics of Plasmas, Vol. 14, Issue 5
Edge plasma boundary layer generated by kink modes in tokamaks
journal, June 2011
- Zakharov, Leonid E.
- Physics of Plasmas, Vol. 18, Issue 6
Modeling of active control of external magnetohydrodynamic instabilities
journal, May 2001
- Bialek, James; Boozer, Allen H.; Mauel, M. E.
- Physics of Plasmas, Vol. 8, Issue 5
Control of Asymmetric Magnetic Perturbations in Tokamaks
journal, November 2007
- Park, Jong-kyu; Schaffer, Michael J.; Menard, Jonathan E.
- Physical Review Letters, Vol. 99, Issue 19
Chapter 3: MHD stability, operational limits and disruptions
journal, December 1999
- Mhd, ITER Physics Expert Group on Disrup; Editors, ITER Physics Basis
- Nuclear Fusion, Vol. 39, Issue 12
The halo current in ASDEX Upgrade
journal, April 2011
- Pautasso, G.; Giannone, L.; Gruber, O.
- Nuclear Fusion, Vol. 51, Issue 4
JET disruption studies in support of ITER
journal, November 2010
- Riccardo, V.; Arnoux, G.; Cahyna, P.
- Plasma Physics and Controlled Fusion, Vol. 52, Issue 12
Understanding disruptions in tokamaks
journal, May 2012
- Zakharov, Leonid E.; Galkin, Sergei A.; Gerasimov, Sergei N.
- Physics of Plasmas, Vol. 19, Issue 5
Use of the virtual-casing principle in calculating the containing magnetic field in toroidal plasma systems
journal, September 1972
- Shafranov, V. D.; Zakharov, L. E.
- Nuclear Fusion, Vol. 12, Issue 5
The theory of the kink mode during the vertical plasma disruption events in tokamaks
journal, June 2008
- Zakharov, Leonid E.
- Physics of Plasmas, Vol. 15, Issue 6
Mathematics and Maxwell's equations
journal, November 2010
- Boozer, Allen H.
- Plasma Physics and Controlled Fusion, Vol. 52, Issue 12
Dynamics of the disruption halo current toroidal asymmetry in NSTX
journal, January 2013
- Gerhardt, S. P.
- Nuclear Fusion, Vol. 53, Issue 2
Theory of nonaxisymmetric vertical displacement events in tokamaks
journal, April 2011
- Fitzpatrick, R.
- Nuclear Fusion, Vol. 51, Issue 5
Non-axisymmetric magnetic fields and toroidal plasma confinement
journal, January 2015
- Boozer, Allen H.
- Nuclear Fusion, Vol. 55, Issue 2
The ITPA disruption database
journal, May 2015
- Eidietis, N. W.; Gerhardt, S. P.; Granetz, R. S.
- Nuclear Fusion, Vol. 55, Issue 6
Rotation of tokamak halo currents
journal, May 2012
- Boozer, Allen H.
- Physics of Plasmas, Vol. 19, Issue 5
Theory of tokamak disruptions
journal, May 2012
- Boozer, Allen H.
- Physics of Plasmas, Vol. 19, Issue 5
Kink modes and surface currents associated with vertical displacement events
journal, August 2012
- Manickam, Janardhan; Boozer, Allen; Gerhardt, Stefan
- Physics of Plasmas, Vol. 19, Issue 8
Chapter 3: MHD stability, operational limits and disruptions
journal, June 2007
- Hender, T. C.; Wesley, J. C.; Bialek, J.
- Nuclear Fusion, Vol. 47, Issue 6
Works referencing / citing this record:
Halo currents and vertical displacements after ITER disruptions
journal, November 2019
- Boozer, Allen H.
- Physics of Plasmas, Vol. 26, Issue 11
Magnetic surface loss and electron runaway
journal, January 2019
- Boozer, Allen H.
- Plasma Physics and Controlled Fusion, Vol. 61, Issue 2
Measurement of scrape-off-layer current dynamics during MHD activity and disruptions in HBT-EP
journal, July 2017
- Levesque, J. P.; Brooks, J. W.; Abler, M. C.
- Nuclear Fusion, Vol. 57, Issue 8
A multi-machine scaling of halo current rotation
journal, December 2017
- Myers, C. E.; Eidietis, N. W.; Gerasimov, S. N.
- Nuclear Fusion, Vol. 58, Issue 1