Argon pumpout by ICRF waves in C-Mod L- and I-mode plasmas

Rice, J. E.; Lin, Y.; Perks, C. J.; Reinke, M. L.; Marmar, E. S.; Cao, N.; Gao, C.; Sciortino, F.; Wukitch, S. J.; Wright, J.

doi:10.1088/1741-4326/ac6ef0

Argon pumpout by ICRF waves in C-Mod L- and I-mode plasmas

Journal Article · Mon May 30 00:00:00 EDT 2022 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac6ef0· OSTI ID:1979417

^[1]; Lin, Y. ^[2]; Perks, C. J. ^[2]; Reinke, M. L. ^[3]; Marmar, E. S. ^[2]; Cao, N. ^[4]; ^[2]; ^[5]; Wukitch, S. J. ^[2]; Wright, J. ^[2]

Massachusetts Institute of Technology (MIT), Cambridge, MA (United States); OSTI
Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)
CFS, Cambridge, MA (United States)
CIMS NYU, NY (United States)
IPP, Garching (Germany)

Pumpout of argon ions by ICRF waves has been observed in C-Mod deuterium L- and I-mode plasmas that had a substantial hydrogen fraction. The effect is manifested by a reduction of core argon x-ray brightness up to a factor of 90% on time scales of tens of milliseconds following injection of ICRF power. For Ar¹⁶⁺, the pumpout is strongest for hydrogen minority concentrations between 0.25 and 0.4, when the ICRF waves are not expected to result in minority heating. Modeling with the TORIC code suggests that the pumpout process occurs when the H/D mode conversion layer overlaps with the 2nd harmonic impurity resonance layer. Here, the magnitude of the argon pumpout is independent of ICRF power above an apparent threshold of ~500 kW, independent of electron density and appears to decrease as the plasma current is increased. Potential application as a heavy impurity control tool in reactors is discussed.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0014264

OSTI ID:: 1979417

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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