Use of Near-Infrared Detector to Sense RF Antenna Heating

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Description

The three antennas used for ion cyclotron heating (ICH) experiments on DIII-D have experienced localized heating of the Faraday shield rods during plasma operations which has resulted in some melting. This melting is of great concern not only because of the damage it does to the rf system's ability to deliver rf to the plasma, but because of its potential to contaminate the plasma during a shot and cast the experimental results from the shot into question. A real-time sensor to detect the temperature of the antennae during plasma operations is described. The sensor uses an avalanche photo diode (APD) ... continued below

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4 p.

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Legg, R.A.; Lee, R.L. & Baity, W.F. November 1, 1999.

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  • General Atomic Company
    Publisher Info: General Atomics, San Diego, CA (United States)
    Place of Publication: San Diego, California

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Description

The three antennas used for ion cyclotron heating (ICH) experiments on DIII-D have experienced localized heating of the Faraday shield rods during plasma operations which has resulted in some melting. This melting is of great concern not only because of the damage it does to the rf system's ability to deliver rf to the plasma, but because of its potential to contaminate the plasma during a shot and cast the experimental results from the shot into question. A real-time sensor to detect the temperature of the antennae during plasma operations is described. The sensor uses an avalanche photo diode (APD) with sensitivity from 0.4 to 1.0 {micro}m to monitor the temperature of the antennae. Calculations for the detector sensitivity based on Planck's law are compared with experimental results and detector data taken during plasma operations are presented.

Physical Description

4 p.

Notes

INIS; OSTI as DE00766649

Medium: P; Size: 4 pages

Source

  • 18th IEEE/NPSS Symposium on Fusion Engineering, Albuquerque, NM (US), 10/25/1999--10/29/1999

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  • Report No.: GA-A23245
  • Grant Number: AC03-99ER54463
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 766649
  • Archival Resource Key: ark:/67531/metadc718072

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • November 1, 1999

Added to The UNT Digital Library

  • Sept. 29, 2015, 5:31 a.m.

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  • April 10, 2017, 8:15 p.m.

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Legg, R.A.; Lee, R.L. & Baity, W.F. Use of Near-Infrared Detector to Sense RF Antenna Heating, article, November 1, 1999; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc718072/: accessed July 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.