Impact of divertor plasma parameters on characteristics of current-convective turbulence under DIII-D-like detached conditions
- National Research Nuclear University, Moscow (Russia). Moscow Engineering Physics Institute (MEPhI)
- General Atomics, San Diego, CA (United States)
- Univ. of California, San Diego, CA (United States)
Recent observations of turbulence in plasma of a DIII-D inner divertor revealed the formation of poloidally localized fluctuations with frequencies in the low-kilohertz range, when the machine was operating in the fluctuating state of detachment. This phenomenon can be related to the onset of the current-convective instability (CCI). In this contribution, we use the basic physical model of the instability to simulate the saturated current-convective turbulence under the DIII-D-like detached conditions. Parameter scans of turbulence characteristics are performed. The spatial and temporal spectra of fluctuations are obtained and compared with the available experimental data. It is demonstrated that simulations are able to qualitatively reproduce most of the distinct features of turbulence found in the experiments, indicating that the CCI can be a plausible mechanism responsible for plasma activity recently observed in DIII-D.
- Research Organization:
- General Atomics, San Diego, CA (United States); Univ. of California, San Diego, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- FC02-04ER54698; FG02-04ER54739; FG02-04ER54739 at UCSD
- OSTI ID:
- 1799654
- Alternate ID(s):
- OSTI ID: 1577396
- Journal Information:
- Physics of Plasmas, Vol. 26, Issue 12; ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Enhanced particle flux due to localized divertor MHD instability in DIII-D tokamak
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journal | February 2020 |
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