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Magnetic field threshold for runaway generation in tokamak disruptions
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Fulop, T., Smith, H. M. and Pokol, G. (2009) Magnetic field threshold for runaway generation in tokamak disruptions. Physics of Plasmas, Vol.16 (No.2). Article no. 022502. doi:10.1063/1.3072980
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Official URL: http://dx.doi.org/10.1063/1.3072980
Abstract
Experimental observations show that there is a magnetic field threshold for runaway electron generation in tokamak disruptions. In this work, two possible reasons for this threshold are studied. The first possible explanation for these observations is that the runaway beam excites whistler waves that scatter the electrons in velocity space prevents the beam from growing. The growth rates of the most unstable whistler waves are inversely proportional to the magnetic field strength. Taking into account the collisional and convective damping of the waves it is possible to derive a magnetic field threshold below which no runaways are expected. The second possible explanation is the magnetic field dependence of the criterion for substantial runaway production obtained by calculating how many runaway electrons can be produced before the induced toroidal electric field diffuses out of the plasma. It is shown, that even in rapidly cooling plasmas, where hot-tail generation is expected to give rise to substantial runaway population, the whistler waves can stop the runaway formation below a certain magnetic field unless the postdisruption temperature is very low.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science > Physics | ||||
| Journal or Publication Title: | Physics of Plasmas | ||||
| Publisher: | American Institute of Physics | ||||
| ISSN: | 1070-664X | ||||
| Official Date: | February 2009 | ||||
| Dates: |
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| Volume: | Vol.16 | ||||
| Number: | No.2 | ||||
| Number of Pages: | 6 | ||||
| Page Range: | Article no. 022502 | ||||
| DOI: | 10.1063/1.3072980 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | European Communities under Association Contract between EURATOM, Vetenskapsradet and HAS, Engineering and Physical Sciences Research Council (EPSRC) |
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