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Permeation measurements for investigating atomic hydrogen flux and wall pumping/fuelling dynamics in QUEST
Authors:S.K. Sharma  H. Zushi  I. Takagi  Y. Hisano  T. Shikama  S. Morita  T. Tanabe  N. Yoshida  M. Sakamoto  Y. Higashizono  K. Hanada  M. Hasegawa  K. Nakamura  H. Idei  K.N. Sato  S. Kawasaki  H. Nakashima  A. Higashijima  Y. Takase
Affiliation:1. IGSES, Kyushu University, Kasuga, Fukuoka 816-8580, Japan;2. RIAM, Kyushu University, Kasuga, Fukuoka 816-8580, Japan;3. Graduate School of Engineering, Kyoto University, Japan;4. National Institute for Fusion Science, Toki, Japan;5. Plasma Research Center, University of Tsukuba, Japan;6. Hydrogen Isotope Research Center, Toyama University, Toyama 930-8555, Japan;7. Graduate School of Frontier Science, University of Tokyo, Ibaragi, Japan;1. Karlsruhe Institute of Technology, Institute for Applied Materials, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany;2. Nuclear Research and Consultancy Group, Westerduinweg 3, Postbus 25, 1755 ZG Petten, The Netherlands;3. The European Joint Undertaking for ITER and the Development of Fusion Energy, c/Josep Pla, no. 2, Torres Diagonal Litoral, Edificio B3, 08019 Barcelona, Spain;1. Sandia National Laboratories, Hydrogen and Metallurgical Science Department, Livermore, CA 94551, USA;2. Idaho National Laboratory, Fusion Safety Program, P.O. Box 1625, Idaho Falls, ID 83415, USA;3. Sandia National Laboratories, Radiation-Solids Interactions Department, Albuquerque, NM 87185, USA;1. Hydrogen Isotope Research Center, University of Toyama, Toyama 930-8555, Japan;2. Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-85748 Garching, Germany;3. Tritium Technology Group, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan;1. Graduate School of Engineering, Kyoto University, Kyoto Daigaku-Katsura, Nishikyo-ku, Kyoto 615-8540, Japan;2. Hydrogen Isotope Research Center, University of Toyama, Gofuku 3190, Toyama 930-8555, Japan;1. Max-Planck-Institut für Plasmaphysik, EURATOM Association, Boltzmannstr. 2, D-85748 Garching b. München, Germany;2. Physique des Interactions Ioniques et Moléculaires, CNRS, Université de Provence, Campus Saint Jérôme, Service 242, 13397 Marseille Cedex 20, France;1. School of Physics and Technology, V.N. Karazin Kharkiv National University, Svobody sq., 4, Kharkiv 61022, Ukraine;2. Gunsan Plasma Technology Research Center, National Fusion Research Institute, 37 Dongjangsan-ro, Gunsan-si, Jeollabuk-do 54004, Republic of Korea
Abstract:In order to investigate the overall atomic hydrogen background and the dynamic characteristics of wall pumping/fuelling phenomenon, a permeation probe system has been developed and applied in the spherical tokamak QUEST. Reliability of measurements, within ±3% accuracy and a positive correlation with the hydrogen line emission over three orders of magnitude have been demonstrated for more than 3000 various plasma discharges. By comparison of the experimental permeation (flux) curves with the numerically simulated curves, the net incident atomic hydrogen flux is evaluated in the range of 1 × 1019 H m?2 s?1 to 4 × 1020 H m?2 s?1. The atomic flux has been investigated as a function of various plasma operation parameters like RF power, gas pressure and magnetic configuration. Using the static particle balance and permeation measurements, the progress in wall conditioning has been investigated. An inverse correlation between the atomic hydrogen flux and improvement in wall pumping has been observed over the two campaigns.
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