TY - JOUR
T1 - Measurement of hydrogen permeation due to atomic flux using permeation probe in the spherical tokamak QUEST
AU - Sharma, Sanjeev K.
AU - Zushi, Hideki
AU - Takagi, Ikuji
AU - Hisano, Yuki
AU - Sakamoto, Mizuki
AU - Higashizono, Yuta
AU - Shikama, Taichi
AU - Morita, Sigeru
AU - Tanabe, Tetsuo
AU - Yoshida, Naoaki
AU - Hanada, Kazuaki
AU - Hasegawa, Makoto
AU - Mitarai, Osamu
AU - Nakamura, Kazuo
AU - Idei, Hiroshi
AU - Sato, Kohnosuke N.
AU - Kawasaki, Shoji
AU - Nakashima, Hisatoshi
AU - Higashijima, Aki
AU - Nakashima, Yousuke
AU - Nishino, Nobuyuki
AU - Hatano, Yuji
AU - Sagara, Akira
AU - Nakamura, Yukio
AU - Ashikawa, Naoko
AU - Maekawa, Takashi
AU - Kishimoto, Yasuaki
AU - Takase, Yuichi
PY - 2010/11
Y1 - 2010/11
N2 - Particle retention and recycling in plasma fusion devices are generally associated with the diffusion of atomic hydrogen into the materials. The resulted permeation of atomic hydrogen is known as plasma driven permeation (PDP). This permeation may also be significant, even in the walls, which are not directly exposed to the plasma. Under similar conditions, the permeation flux (Γperm) of hydrogen through a 30 μm thick Ni membrane heated at 412-575 K has been measured in the spherical tokamak QUEST. Γperm is being measured during the scans of different operating parameters like RF power (PRF), chamber pressure (P chamber), discharge widths (τdis) and vertical magnetic field (BZ). Simultaneously edge plasma density and spectral intensities of atomic (Balmer) lines and molecular (Fulcher) bands have been compared with the permeation measurements. A linear relationship has been established between the time integrated Γperm i.e. permeation fluence (Qperm) and the time integrated Hα intensity i.e. Hα fluence (Qα). Qperm also shows a strong relationship with the edge plasma density and various spectral fluences. The obtained results are discussed for exploring the applicability of the permeation probes in measuring the atomic flux near the first walls.
AB - Particle retention and recycling in plasma fusion devices are generally associated with the diffusion of atomic hydrogen into the materials. The resulted permeation of atomic hydrogen is known as plasma driven permeation (PDP). This permeation may also be significant, even in the walls, which are not directly exposed to the plasma. Under similar conditions, the permeation flux (Γperm) of hydrogen through a 30 μm thick Ni membrane heated at 412-575 K has been measured in the spherical tokamak QUEST. Γperm is being measured during the scans of different operating parameters like RF power (PRF), chamber pressure (P chamber), discharge widths (τdis) and vertical magnetic field (BZ). Simultaneously edge plasma density and spectral intensities of atomic (Balmer) lines and molecular (Fulcher) bands have been compared with the permeation measurements. A linear relationship has been established between the time integrated Γperm i.e. permeation fluence (Qperm) and the time integrated Hα intensity i.e. Hα fluence (Qα). Qperm also shows a strong relationship with the edge plasma density and various spectral fluences. The obtained results are discussed for exploring the applicability of the permeation probes in measuring the atomic flux near the first walls.
UR - https://www.scopus.com/pages/publications/78649514868
UR - https://www.scopus.com/pages/publications/78649514868#tab=citedBy
U2 - 10.1016/j.fusengdes.2010.08.032
DO - 10.1016/j.fusengdes.2010.08.032
M3 - Article
AN - SCOPUS:78649514868
SN - 0920-3796
VL - 85
SP - 950
EP - 955
JO - Fusion Engineering and Design
JF - Fusion Engineering and Design
IS - 6
ER -