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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 ISSN 1070-664X.

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Official URL: http://dx.doi.org/10.1063/1.3072980

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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, Engineering and Medicine > Science > Physics
Journal or Publication Title: Physics of Plasmas
Publisher: American Institute of Physics
ISSN: 1070-664X
Official Date: February 2009
Dates:
DateEvent
February 2009Published
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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