SOLPS analysis of the necessary conditions for detachment cliff

Du, Hailong; Zheng, Guoyao; Guo, Houyang; Jaervinen, Aaro E.; Duan, Xuru; Bonnin, Xavier; Eldon, David; Wang, Dezhen

doi:10.1088/1741-4326/ab77e6

SOLPS analysis of the necessary conditions for detachment cliff

Journal Article · Mon Mar 16 00:00:00 EDT 2020 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ab77e6· OSTI ID:1608953

Du, Hailong ^[1]; Zheng, Guoyao ^[2]; Guo, Houyang ^[3]; ^[4]; Duan, Xuru ^[2]; Bonnin, Xavier ^[5]; Eldon, David ^[3]; ^[6]

Southwestern Inst. of Physics, Chengdu (China); General Atomics, Energy & Advanced Concepts, DIII-D
Southwestern Inst. of Physics, Chengdu (China)
General Atomics, San Diego, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
ITER Organization, St. Paul Lez Durance (France)
Dalian Univ. of Technology, Dalian (China)

SOLPS modeling including full cross-filed drifts is used, for the first time, to reproduce the step-like detachment onset observed in the DIII-D tokamak previously simulated with UEDGE [Jaervinen A. E. et al., 2018 Phys. Rev. Lett.121 075001], and to further investigate the underlying physics processes. The SOLPS analysis reveals a strong interplay between the E×B drift-driven flows and carbon radiation in DIII-D. The modeling shows that the high confinement H-mode facilitates the formation of such a detachment cliff due to the narrow SOL width and hence steep radial gradients near the separatrix, which enhances the poloidal E×B drift. Furthermore, the SOLPS modeling indicates that carbon radiation also plays a key role in the formation of the detachment cliff in DIII-D without additional impurity seeding. These findings may have significant implications for the control and maintenance of divertor detachment for the steady-state operation of high-power fusion devices.

View Accepted Manuscript (DOE)

Research Organization:: General Atomics, San Diego, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: AC52-07NA27344; FC02-04ER54698

OSTI ID:: 1608953

Alternate ID(s):: OSTI ID: 1616397
OSTI ID: 23013577

Report Number(s):: LLNL-JRNL--777062

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 4 Vol. 60; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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