Abstract
Poloidal and radial distributions of the hydrogen flux, both atomic and ion, to the plasma facing materials (PFMs) are measured with four fixed and one movable PdCu membrane probes in the QUEST spherical tokamak. Direct information about hydrogen retention in the areas far from main plasma-wall interaction is essential because the significant part of the global retention is due to atomic hydrogen. Incident hydrogen flux Γinc is numerically reconstructed by fitting the experimentally measured hydrogen flux Γp, permeated through the membrane. The sensitivity of the probe is improved when compared with other work which allows dynamic changes of the retention flux to be monitored, allowing detection of 10% of the Γinc modulation, or ∼1017 H m−2s−1.
| Original language | English |
|---|---|
| Pages (from-to) | 178-182 |
| Number of pages | 5 |
| Journal | Vacuum |
| Volume | 129 |
| DOIs | |
| Publication status | Published - Jul 1 2016 |
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All Science Journal Classification (ASJC) codes
- Instrumentation
- Condensed Matter Physics
- Surfaces, Coatings and Films
Cite this
Hydrogen flux measurements with permeation probes in spherical tokamak QUEST. / Kuzmin, A.; Zushi, H.; Takagi, I.; Sharma, S. K.; Hirooka, Y.; Kobayashi, M.; Sakamoto, M.; Hanada, K.; Onchi, T.; Oyama, Y.; Youshida, N.; Nakamura, K.; Fujisawa, A.; Idei, H.; Nagashima, Y.; Hasegawa, M.; Mishra, K.
In: Vacuum, Vol. 129, 01.07.2016, p. 178-182.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Hydrogen flux measurements with permeation probes in spherical tokamak QUEST
AU - Kuzmin, A.
AU - Zushi, H.
AU - Takagi, I.
AU - Sharma, S. K.
AU - Hirooka, Y.
AU - Kobayashi, M.
AU - Sakamoto, M.
AU - Hanada, K.
AU - Onchi, T.
AU - Oyama, Y.
AU - Youshida, N.
AU - Nakamura, K.
AU - Fujisawa, A.
AU - Idei, H.
AU - Nagashima, Y.
AU - Hasegawa, M.
AU - Mishra, K.
PY - 2016/7/1
Y1 - 2016/7/1
N2 - Poloidal and radial distributions of the hydrogen flux, both atomic and ion, to the plasma facing materials (PFMs) are measured with four fixed and one movable PdCu membrane probes in the QUEST spherical tokamak. Direct information about hydrogen retention in the areas far from main plasma-wall interaction is essential because the significant part of the global retention is due to atomic hydrogen. Incident hydrogen flux Γinc is numerically reconstructed by fitting the experimentally measured hydrogen flux Γp, permeated through the membrane. The sensitivity of the probe is improved when compared with other work which allows dynamic changes of the retention flux to be monitored, allowing detection of 10% of the Γinc modulation, or ∼1017 H m−2s−1.
AB - Poloidal and radial distributions of the hydrogen flux, both atomic and ion, to the plasma facing materials (PFMs) are measured with four fixed and one movable PdCu membrane probes in the QUEST spherical tokamak. Direct information about hydrogen retention in the areas far from main plasma-wall interaction is essential because the significant part of the global retention is due to atomic hydrogen. Incident hydrogen flux Γinc is numerically reconstructed by fitting the experimentally measured hydrogen flux Γp, permeated through the membrane. The sensitivity of the probe is improved when compared with other work which allows dynamic changes of the retention flux to be monitored, allowing detection of 10% of the Γinc modulation, or ∼1017 H m−2s−1.
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U2 - 10.1016/j.vacuum.2016.04.025
DO - 10.1016/j.vacuum.2016.04.025
M3 - Article
AN - SCOPUS:84992311238
VL - 129
SP - 178
EP - 182
JO - Vacuum
JF - Vacuum
SN - 0042-207X
ER -