Real-time wall conditioning and recycling modification utilizing boron and boron nitride powder injections into the Large Helical Device

Lunsford, Robert; Masuzaki, Suguru; Nespoli, Federico; Ashikawa, Naoko; Gilson, Erik P.; Gates, David A.; Ida, Katsumi; Kawamura, Gakushi; Morisaki, Tomohiro; Nagy, Alexander; Oishi, Tetsutarou; Shoji, Mamoru; Suzuki, Chihiro; Yoshinuma, M.

doi:10.1088/1741-4326/ac6ff5

Real-time wall conditioning and recycling modification utilizing boron and boron nitride powder injections into the Large Helical Device

Journal Article · Thu Jun 16 00:00:00 EDT 2022 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac6ff5· OSTI ID:1869950

^[1]; ^[2]; ^[1]; ^[2]; ^[1]; Gates, David A. ^[1]; ^[2]; ^[2]; ^[2]; Nagy, Alexander ^[1]; Oishi, Tetsutarou ^[2]; Shoji, Mamoru ^[3]; ^[2]; Yoshinuma, M. ^[3]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
National Institute for Fusion Science (NIFS), Toki (Japan); Graduate University for Advanced Studies (SOKENDAI), Toki (Japan)
National Institute for Fusion Science (NIFS), Toki (Japan)

Controlled particulate injections from the PPPL impurity powder dropper (IPD) into the Large Helical Device have demonstrated positive effects on the wall conditions on both an intra and inter-shot basis. Here injections over a range of densities, input powers, pulse lengths, heating schemes, injection quantities and main ion species show conclusive evidence of improvement to plasma wall conditions. Successful injections are confirmed by both spectroscopic measurements as well as real-time visible camera signals. In 7 s long plasmas the responses include a reduction in wall recycling as well as a reduction in native impurity content as observed over the course of several discharges. For plasmas longer than 40 s, improvements to the recycling rate and increased impurity control are observed in real time as a consequence of the extended particulate injections. These experiments demonstrate the extended applicability of this solid particulate conditioning technique to the control and maintenance of the plasma wall conditions. In addition they are an important initial step in the development of the real-time boronization technique as a supplement to standard conditioning scenarios.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1869950

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 8 Vol. 62; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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