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Runaway electron imaging spectrometry (REIS) system.

F Causa1, M Gospodarczyk2, P Buratti3

  • 1Istituto di Fisica del Plasma, Consiglio Nazionale delle Ricerche, Via R. Cozzi, 53, 20125 Milano, Italy.

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|August 3, 2019
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Summary
This summary is machine-generated.

A portable Runaway Electron Imaging and Spectrometry System (REIS) was developed to measure tokamak synchrotron radiation. This system captures visible and infrared spectra and images, providing valuable data for fusion energy research.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Tokamak Diagnostics

Background:

  • Runaway electrons pose a significant challenge in tokamak operations, potentially damaging plasma-facing components.
  • Accurate measurement of synchrotron radiation from runaway electrons is crucial for understanding and mitigating their effects.
  • Existing diagnostic systems may lack the portability or simultaneous spectral and imaging capabilities required for comprehensive analysis.

Purpose of the Study:

  • To introduce a novel portable diagnostic system for in-flight runaway electron analysis in tokamaks.
  • To detail the architecture and data acquisition capabilities of the Runaway Electron Imaging and Spectrometry System (REIS).
  • To present initial experimental results obtained using the REIS in the Frascati Tokamak Upgrade (FTU).

Main Methods:

  • Development of a wide-angle optical system incorporating an incoherent fiber bundle for simultaneous visible and infrared spectral collection (500-2500 nm).
  • Integration of a CCD color microcamera for capturing visible images at 25 frames/s.
  • Implementation of a LabVIEW-based control system for synchronized data acquisition from three spectrometers with millisecond-level resolution.

Main Results:

  • Successful deployment and operation of the portable REIS system in the FTU tokamak.
  • Acquisition of simultaneous visible and infrared synchrotron radiation spectra and visible images of runaway electrons.
  • Demonstration of the system's capability to provide high-resolution, time-resolved diagnostic data.

Conclusions:

  • The developed REIS system offers a versatile and portable solution for runaway electron diagnostics in tokamaks.
  • The system's ability to acquire both spectral and imaging data simultaneously enhances the understanding of runaway electron behavior.
  • Experimental data from FTU validate the effectiveness of the REIS for fusion energy research and plasma control.