Measurement of hydrogen permeation due to atomic flux using permeation probe in the spherical tokamak QUEST

Sanjeev K. Sharma, Hideki Zushi, Ikuji Takagi, Yuki Hisano, Mizuki Sakamoto, Yuta Higashizono, Taichi Shikama, Sigeru Morita, Tetsuo Tanabe, Naoaki Yoshida, Kazuaki Hanada, Makoto Hasegawa, Osamu Mitarai, Kazuo Nakamura, Hiroshi Idei, Kohnosuke N. Sato, Shoji Kawasaki, Hisatoshi Nakashima, Aki Higashijima, Yousuke NakashimaNobuyuki Nishino, Yuji Hatano, Akira Sagara, Yukio Nakamura, Naoko Ashikawa, Takashi Maekawa, Yasuaki Kishimoto, Yuichi Takase

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)950-955
Number of pages6
JournalFusion Engineering and Design
Volume85
Issue number6
DOIs
Publication statusPublished - Nov 2010

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

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