Sakamoto R, Motojima G, Hayashi H, Inoue T, Ito Y, Ogawa H, Takami S, Yokota M, Yamada H. Twenty barrel in situ pipe gun type solid hydrogen pellet injector for the Large Helical Device.
THE REVIEW OF SCIENTIFIC INSTRUMENTS 2013;
84:083504. [PMID:
24007062 DOI:
10.1063/1.4816823]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A 20 barrel solid hydrogen pellet injector, which is able to inject 20 cylindrical pellets with a diameter and length of between 3.0 and 3.8 mm at the velocity of 1200 m/s, has been developed for the purpose of direct core fueling in LHD (Large Helical Device). The in situ pipe gun concept with the use of compact cryo-coolers enables stable operation as a fundamental facility in plasma experiments. The combination of the two types of pellet injection timing control modes, i.e., pre-programing mode and real-time control mode, allows the build-up and sustainment of high density plasma around the density limit. The pellet injector has demonstrated stable operation characteristics during the past three years of LHD experiments.
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