Charge-exchange neutral hydrogen measurements in TFTR using Pd-MOS microsensors

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An array of Pd-metal-oxide semiconductor (Pd-MOS) diodes has been used to monitor the fluence and energy of charge-exchange neutral hydrogen isotopes striking the wall of the Tokamak Fusion Test Reactor (TFTR). The array was positioned 4 cm behind the graphite-tiled wall at the toroidal midplane and exposed to several hundred plasma discharges. Hydrogen isotopes striking the Pd-MOS diodes were detected by measuring the leakage current, which is affected by the presence of these species at the Pd/SiO{sub 2} interface. It was found that the midplane flux strongly increased for neutral-beam heated plasmas and correlated with co-injected neutral beam power. The ... continued below

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Pages: (15 p)

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Bastasz, R. (Sandia National Labs., Livermore, CA (USA)); Kilpatrick, S.J. (Princeton Univ., NJ (USA). Plasma Physics Lab.) & Ruzic, D.N. (Illinois Univ., Urbana, IL (USA). Dept. of Nuclear Engineering) June 1, 1991.

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Description

An array of Pd-metal-oxide semiconductor (Pd-MOS) diodes has been used to monitor the fluence and energy of charge-exchange neutral hydrogen isotopes striking the wall of the Tokamak Fusion Test Reactor (TFTR). The array was positioned 4 cm behind the graphite-tiled wall at the toroidal midplane and exposed to several hundred plasma discharges. Hydrogen isotopes striking the Pd-MOS diodes were detected by measuring the leakage current, which is affected by the presence of these species at the Pd/SiO{sub 2} interface. It was found that the midplane flux strongly increased for neutral-beam heated plasmas and correlated with co-injected neutral beam power. The majority of the neutral flux was {lt}50 eV in energy but its energy distribution extended to above 500 eV. 20 refs., 4 figs.

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Pages: (15 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • Satellite workshop of the 9th PSI conference, Cadarache (France), 28-30 May 1990

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  • Other: DE91013455
  • Report No.: PPPL-2746
  • Report No.: CONF-9005324--1
  • Grant Number: AC02-76CH03073
  • Office of Scientific & Technical Information Report Number: 5618604
  • Archival Resource Key: ark:/67531/metadc1092420

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  • June 1, 1991

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  • Feb. 10, 2018, 10:06 p.m.

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  • May 11, 2018, 2:52 p.m.

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Bastasz, R. (Sandia National Labs., Livermore, CA (USA)); Kilpatrick, S.J. (Princeton Univ., NJ (USA). Plasma Physics Lab.) & Ruzic, D.N. (Illinois Univ., Urbana, IL (USA). Dept. of Nuclear Engineering). Charge-exchange neutral hydrogen measurements in TFTR using Pd-MOS microsensors, article, June 1, 1991; New Jersey. (digital.library.unt.edu/ark:/67531/metadc1092420/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.