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High Resolution Physical Characterization of Single Metallic Nanoparticles
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A photodiode-based neutral particle bolometer for characterizing charge-exchanged fast-ion behavior.

R Clary1, A Smirnov, S Dettrick

  • 1Tri Alpha Energy, Inc., Rancho Santa Margarita, California 92688, USA. rclary@trialphaenergy.com

The Review of Scientific Instruments
|November 7, 2012
PubMed
Summary

A new neutral particle bolometer (NPB) measures fast-ion losses in fusion plasmas. It helps understand how wall interactions affect these energetic particles during neutral beam injection.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Particle Diagnostics

Background:

  • Neutral beam injection (NBI) is crucial for heating and sustaining fusion plasmas.
  • Understanding fast-ion behavior and losses is essential for efficient fusion energy production.
  • Charge-exchange losses can significantly impact plasma performance.

Purpose of the Study:

  • To design and implement a neutral particle bolometer (NPB) for diagnosing fast-ion populations.
  • To spatially and temporally resolve charge-exchange losses in Tri Alpha Energy's C-2 device.
  • To investigate the effects of wall recycling on fast-ion losses.

Main Methods:

  • Utilized a silicon photodiode detector for particle detection.
  • Incorporated a tungsten filter coating to minimize optical light interference.
  • Calibrated the NPB and conducted measurements on the C-2 field-reversed configuration (FRC) plasma.

Main Results:

  • Successfully designed and implemented the NPB instrument.
  • Demonstrated the capability to measure fast-ion losses.
  • Observed and reported typical measurement results concerning wall recycling effects.

Conclusions:

  • The NPB is a viable diagnostic for studying fast-ion losses in FRC plasmas.
  • Wall recycling significantly influences fast-ion populations.
  • Further research can utilize this diagnostic to optimize NBI and plasma confinement.