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Summary

The Indian Test Facility (INTF) will characterize the ITER diagnostic neutral beam system using various diagnostics. This research focuses on optimizing the negative hydrogen ion source performance and ensuring safe operation through advanced measurement techniques.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Accelerator Technology

Background:

  • The ITER diagnostic neutral beam system requires precise characterization for optimal performance.
  • The negative hydrogen ion source is critical for beam quality and requires robust diagnostics for safe and efficient operation.

Purpose of the Study:

  • To establish the functionality of the eight inductively coupled RF plasma driver based negative hydrogen ion source and its beamline components at the Indian Test Facility (INTF).
  • To detail the comprehensive diagnostic suite planned for the INTF to characterize ion source performance and beam quality.

Main Methods:

  • Optical emission spectroscopy (OES) and cavity ring down spectroscopy for negative ions and cesium.
  • Electrostatic probes for plasma characterization near the extraction region.
  • Doppler shift spectroscopy for beam divergence and stripping losses.
  • Infrared imaging and standard thermocouples/voltage-current sensors for initial characterization and safe operation.
  • Plasma impedance measurement using RF electrical impedance matching parameters to characterize RF driver plasma.

Main Results:

  • The INTF will employ a multi-diagnostic approach to thoroughly evaluate the neutral beam system.
  • A novel plasma impedance measurement technique will be tested and validated against OES data.
  • The study will provide an overview of diagnostic procurement, experimentation, and integration status.

Conclusions:

  • The INTF diagnostics are essential for understanding and optimizing the ITER diagnostic neutral beam system.
  • The integrated diagnostic system will ensure safe and efficient operation of the negative hydrogen ion source.
  • Validation of novel diagnostic techniques will contribute to advancements in plasma characterization for fusion applications.