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Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas
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Langmuir probe electronics upgrade on the tokamak à configuration variable.

H De Oliveira1, P Marmillod1, C Theiler1

  • 1Ecole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center (SPC), CH-1015 Lausanne, Switzerland.

The Review of Scientific Instruments
|September 2, 2019
PubMed
Summary

The Tokamak à Configuration Variable (TCV) upgraded its Langmuir probe system with 120 amplifiers, enabling simultaneous connection to 114 probes. This enhancement improves plasma diagnostics, though transistor damage during off-normal events requires further solutions.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Diagnostic Instrumentation

Background:

  • Langmuir probes are essential for plasma characterization in fusion devices.
  • Previous generations of Langmuir probe electronics at TCV (Tokamak à Configuration Variable) had limitations in probe connectivity and amplifier count.
  • The TCV divertor upgrade necessitated an expansion of diagnostic capabilities.

Purpose of the Study:

  • To detail the upgrade of Langmuir probe electronics for the TCV tokamak.
  • To increase the number of simultaneously connectable Langmuir probes for comprehensive plasma monitoring.
  • To present technical improvements and address potential issues in the new amplifier circuitry.

Main Methods:

  • Detailed description of the new Langmuir probe amplifier circuitry.
  • Comparison of the third-generation amplifiers with previous generations (1993/1994 and 2012/2013).
  • Successful operation of the upgraded system for over a year, monitoring plasma events.

Main Results:

  • The number of amplifiers increased from 48 to 120, allowing simultaneous connection to 114 Langmuir probes.
  • An additional 108 amplifiers are ready for installation to support 80 new probes.
  • The new amplifiers have performed successfully, but silicon power transistors showed susceptibility to damage during off-normal plasma events.

Conclusions:

  • The Langmuir probe electronics upgrade significantly enhances TCV's plasma diagnostic capabilities.
  • The new system supports a greater number of probes for detailed plasma analysis.
  • Mitigation strategies for transistor damage during off-normal plasma events are under investigation.