Time-resolved Temperature Measurements in SSPX

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We seek to measure time-resolved electron temperatures in the SSPX plasma using soft X-rays from free-free Bremsstrahlung radiation. To increase sensitivity to changes in temperature over the range 100-300 eV, we use two photodiode detectors sensitive to different soft X-ray energies. The detectors, one with a Zr/C coating and the other with a Ti/Pd coating, view the plasma along a common line of sight tangential to the magnetic axis of the spheromak, where the electron temperature is a maximum. The comparison of the signals, over a similar volume of plasma, should be a stronger function of temperature than a single ... continued below

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Ludington, A R; Hill, D N; McLean, H S; Moller, J & Wood, R D August 14, 2006.

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Description

We seek to measure time-resolved electron temperatures in the SSPX plasma using soft X-rays from free-free Bremsstrahlung radiation. To increase sensitivity to changes in temperature over the range 100-300 eV, we use two photodiode detectors sensitive to different soft X-ray energies. The detectors, one with a Zr/C coating and the other with a Ti/Pd coating, view the plasma along a common line of sight tangential to the magnetic axis of the spheromak, where the electron temperature is a maximum. The comparison of the signals, over a similar volume of plasma, should be a stronger function of temperature than a single detector in the range of Te< 300 eV. The success of using photodiodes to detect changing temperatures along a chord will make the case for designing an array of the detectors, which could provide a time changing temperature profile over a larger portion of the plasma.

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PDF-file: 12 pages; size: 0.4 Mbytes

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  • Report No.: UCRL-TR-223809
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/892077 | External Link
  • Office of Scientific & Technical Information Report Number: 892077
  • Archival Resource Key: ark:/67531/metadc883269

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  • August 14, 2006

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 2, 2016, 3:44 p.m.

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Ludington, A R; Hill, D N; McLean, H S; Moller, J & Wood, R D. Time-resolved Temperature Measurements in SSPX, report, August 14, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc883269/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.