Effects of magnetic islands on bootstrap current in toroidal plasmas
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
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.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- Grant/Contract Number:
- FC02-08ER54976; AC02-09CH11466; AC05-00OR22725; AC02-05CH11231
- OSTI ID:
- 1347146
- Alternate ID(s):
- OSTI ID: 1336510
- Report Number(s):
- PPPL-5326; China Scholarship Council [201206010268]; TRN: US1701122
- Journal Information:
- Nuclear Fusion, Vol. 57, Issue 3; ISSN 0029-5515
- Publisher:
- IOP ScienceCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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