Overview of ion source characterization diagnostics in INTF.

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.