Development of the Supersonic Jet Pump for Realization of Vacuum Pumping in the Fusion Reactor

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H04233
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: National Institute for Fusion Science
• Principal Investigator: Miyazawa Junichi 核融合科学研究所, ヘリカル研究部, 教授 (50300728)
• Co-Investigator(Renkei-kenkyūsha): GOTO Takuya 核融合科学研究所, ヘリカル研究部, 助教 (30509518) ; SAKAMOTO RYuichi 核融合科学研究所, ヘリカル研究部, 教授 (10290917) ; MIURA Hideaki 核融合科学研究所, ヘリカル研究部, 教授 (40280599) ; TANAKA Masahiro 核融合科学研究所, ヘリカル研究部, 准教授 (00435520) ; SAGARA Akio 核融合科学研究所, ヘリカル研究部, 教授 (20187058)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 真空排気 / 核融合炉 / 超音速 / クライオポンプ / 拡散ポンプ

Outline of Final Research Achievements

The Supersonic Jet Pump (SJP) is an innovative vacuum pump that has a possibility of simultaneous and continuous evacuation of hydrogen isotopes and helium gasses at a high exhaust speed. In the SJP, the exhaust gasses are blown as the supersonic jet from the Blowing Units (BUs) to the Cold Core Rod (CCR) cooled down to ~10 K. Gasses become frozen on the surface of the CCR. The Rotating Cutter (RC) shaves off the frozen gasses to the bottom, where the shaved frozen gasses become sublimated and are evacuated by a roughing pump. A part of the sublimated gasses is introduced to the BUs and blown to the CCR again.
The proof-of-principle experiment of the SJP has been performed. The experimental results show that (i) the exhaust speed of the SJP is 0.3 - 0.5 m3/s (air), that is comparable to that of a large TMP, (ii) this exhaust speed is sustained after 100,000 seconds of pumping with 5 - 7 sccm of air supply, and (iii) the hydrogen gas component largely increases when the RC is rotated.

Free Research Field

核融合学