2018年
Establishment of a low recycling state with full density control by active pumping of the closed helical divertor at LHD
Nuclear Fusion
- 巻
- 58
- 号
- 1
- 開始ページ
- 014005
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1088/1741-4326/aa9720
Superior control of particle recycling and hence full governance of plasma density has been established in the Large Helical Device (LHD) using largely enhanced active pumping of the closed helical divertor (CHD). In-vessel cryo-sorption pumping systems inside the CHD in five out of ten inner toroidal divertor sections have been developed and installed step by step in the LHD. The total effective pumping speed obtained was 67 ± 5 m s in hydrogen, which is approximately seven times larger than previously obtained. As a result, a low recycling state was observed with CHD pumping for the first time in LHD featuring excellent density control even under intense pellet fueling conditions. A global particle confinement time (τ ) is used for comparison of operation with and without the CHD pumping. The τ was evaluated from the density decay after the fueling of hydrogen pellet injection or gas puffing in NBI plasmas. A reliably low base density before the fueling and short after the fueling were obtained during the CHD pumping, demonstrating for the first time full control of the particle balance with active pumping in the CHD. 3 -1 ∗ ∗ p p
- リンク情報
- ID情報
-
- DOI : 10.1088/1741-4326/aa9720
- ISSN : 0029-5515
- eISSN : 1741-4326
- ORCIDのPut Code : 59253462
- SCOPUS ID : 85038635943