Study of runaway electron behaviour during electron cyclotron resonance heating in the HL-2A Tokamak |
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Authors: | Zhang Yi-Po Yang Jin-Wei Liu Yi Song Xian-Ying Yuan Guo-Liang Li Xu Zhou Yan Zhou Jun Yang Qing-Wei Chen Liao-Yuan Rao Jun Duan Xu-Ru Pan Chuan-Hong and HL-A Team |
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Institution: | Southwestern Institute of Physics, P O Box 432, Chengdu
610041, China |
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Abstract: | During the current flat-top phase of electron cyclotron
resonance heating discharges in the HL-2A Tokamak, the behaviour of
runaway electrons has been studied by means of hard x-ray detectors
and neutron diagnostics. During electron cyclotron resonance
heating, it can be found that both hard x-ray radiation intensity
and neutron emission flux fall rapidly to a very low level, which
suggests that runaway electrons have been suppressed by electron
cyclotron resonance heating. From the set of discharges studied in
the present experiments, it has also been observed that the
efficiency of runaway suppression by electron cyclotron resonance
heating was apparently affected by two factors: electron cyclotron
resonance heating power and duration. These results have been
analysed by using a test particle model. The decrease of the
toroidal electric field due to electron cyclotron resonance heating
results in a rapid fall in the runaway electron energy that may lead
to a suppression of runaway electrons. During electron cyclotron
resonance heating with different powers and durations, the runaway
electrons will experience different slowing down processes. These
different decay processes are the major cause for influencing the
efficiency of runaway suppression. This result is related to the
safe operation of the Tokamak and may bring an effective control of
runaway electrons. |
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Keywords: | runaway electron electron cyclotron resonance heating runaway suppression suppression efficiency |
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