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Title: Effects of magnetic islands on bootstrap current in toroidal plasmas

The effects of magnetic islands on electron bootstrap current in toroidal plasmas are studied using gyrokinetic simulations. The magnetic islands cause little changes of the bootstrap current level in the banana regime because of trapped electron effects. In the plateau regime, the bootstrap current is completely suppressed at the island centers due to the destruction of trapped electron orbits by collisions and the flattening of pressure profiles by the islands. In the collisional regime, small but finite bootstrap current can exist inside the islands because of the pressure gradients created by large collisional transport across the islands. Lastly, simulation results show that the bootstrap current level increases near the island separatrix due to steeper local density gradients.
Authors:
 [1] ;  [2]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
Publication Date:
Report Number(s):
PPPL-5326
Journal ID: ISSN 0029-5515; China Scholarship Council [201206010268]; TRN: US1701122
Grant/Contract Number:
FC02-08ER54976; AC02-09CH11466; AC05-00OR22725; AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 3; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Research Org:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; NTM; bootstrap current; trapped electron effects
OSTI Identifier:
1347146
Alternate Identifier(s):
OSTI ID: 1336510

Dong, G., and Lin, Z.. Effects of magnetic islands on bootstrap current in toroidal plasmas. United States: N. p., Web. doi:10.1088/1741-4326/57/3/036009.
Dong, G., & Lin, Z.. Effects of magnetic islands on bootstrap current in toroidal plasmas. United States. doi:10.1088/1741-4326/57/3/036009.
Dong, G., and Lin, Z.. 2016. "Effects of magnetic islands on bootstrap current in toroidal plasmas". United States. doi:10.1088/1741-4326/57/3/036009. https://www.osti.gov/servlets/purl/1347146.
@article{osti_1347146,
title = {Effects of magnetic islands on bootstrap current in toroidal plasmas},
author = {Dong, G. and Lin, Z.},
abstractNote = {The effects of magnetic islands on electron bootstrap current in toroidal plasmas are studied using gyrokinetic simulations. The magnetic islands cause little changes of the bootstrap current level in the banana regime because of trapped electron effects. In the plateau regime, the bootstrap current is completely suppressed at the island centers due to the destruction of trapped electron orbits by collisions and the flattening of pressure profiles by the islands. In the collisional regime, small but finite bootstrap current can exist inside the islands because of the pressure gradients created by large collisional transport across the islands. Lastly, simulation results show that the bootstrap current level increases near the island separatrix due to steeper local density gradients.},
doi = {10.1088/1741-4326/57/3/036009},
journal = {Nuclear Fusion},
number = 3,
volume = 57,
place = {United States},
year = {2016},
month = {12}
}