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Hard X-ray spatial array diagnostics on Joint Texas Experimental Tokamak.

D W Huang1, Z Y Chen1, Y H Luo1

  • 1State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.

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|November 29, 2014
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A new hard X-ray detection array helps diagnose runaway electron loss in tokamaks. Most runaway electrons are lost at limiters, with biased probes and magnetic perturbations influencing their diffusion and loss rates.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • High-energy particle diagnostics

Background:

  • Understanding and controlling runaway electrons is crucial for tokamak fusion reactor safety.
  • Runaway electrons can cause significant damage to plasma-facing components.

Purpose of the Study:

  • To develop and utilize a hard X-ray detection array for diagnosing runaway electron loss.
  • To investigate the spatial distribution and loss mechanisms of runaway electrons.

Main Methods:

  • Development of a spatially distributed hard X-ray detection array using 12 Cadmium Telluride (CdTe) detectors.
  • Measurement of hard X-ray radiation (0.3-1 MeV) from runaway electrons.
  • Application of electrode biasing probes and resonant magnetic perturbations.

Main Results:

  • The detection array provides toroidal and poloidal resolution of runaway electron loss.
  • Most runaway electrons reaching the plasma boundary are lost at the limiters.
  • Electrode biasing probes enhance local runaway electron loss.
  • Resonant magnetic perturbations increase runaway electron diffusion and cause asymmetric poloidal loss.

Conclusions:

  • The developed hard X-ray detection array is effective for diagnosing runaway electron loss.
  • Limiters play a significant role in the termination of runaway electrons.
  • External perturbations like electrode biasing and magnetic fields can control runaway electron loss pathways.