Magnetic Polarization Measurements of the Multi-modal Plasma Response to 3D fields in the EAST Tokamak

Logan, Nikolas; Cui, L.; Wang, Hui -Hui; Sun, Youwen; Gu, Shuai; Li, Guoqiang; Nazikian, Raffi; Paz-Soldan, Carlos

doi:10.1088/1741-4326/aac129

Title: Magnetic Polarization Measurements of the Multi-modal Plasma Response to 3D fields in the EAST Tokamak

Journal Article · Mon Apr 30 00:00:00 EDT 2018 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aac129· OSTI ID:1436768

Logan, Nikolas ^[1]; Cui, L. ^[1]; Wang, Hui -Hui ^[2];

^[2]; Gu, Shuai ^[2];

^[2]; Nazikian, Raffi ^[1]; Paz-Soldan, Carlos ^[3]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Chinese Academy of Sciences, Anhui (China)
General Atomics, San Diego, CA (United States)

A multi-modal plasma response to applied non-axisymmetric fields has been found in EAST tokamak plasmas. Here, multi-modal means the radial and poloidal structure of an individually driven toroidal harmonic is not fixed. The signature of such a multi-modal response is the magnetic polarization (ratio of radial and poloidal components) of the plasma response field measured on the low field side device mid-plane. A difference in the 3D coil phasing (the relative phase of two coil arrays) dependencies between the two responses is observed in response to n=2 fields in the same plasma for which the n=1 responses are well synchronized. Neither the maximum radial nor the maximum poloidal field response to n=2 fields agrees with the best applied phasing for mitigating edge localized modes, suggesting that the edge plasma response is not a dominant component of either polarization. GPEC modeling reproduces the discrepant phasing dependences of the experimental measurements, and confirms the edge resonances are maximized by the coil phasing that mitigates ELMs in the experiments. The model confirms the measured plasma response is not dominated by resonant current drive from the external field. Instead, non-resonant contributions play a large role in the diagnostic signal for both toroidal harmonics n=1 and n=2. The analysis in this paper demonstrates the ability of 3D modeling to connect external magnetic sensor measurements to the internal plasma physics and accurately predict optimal applied 3D field configurations in multi-modal plasmas.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466; 11475224

OSTI ID:: 1436768

Journal Information:: Nuclear Fusion, Vol. 58, Issue 7; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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Cited By (2)

Identification of multiple eigenmode growth rates in DIII-D and EAST tokamak plasmas Wang, Z. R.; Logan, N. C.; Munaretto, S. Nuclear Fusion, Vol. 59, Issue 2 https://doi.org/10.1088/1741-4326/aaf671	journal	January 2019
A new criterion for controlling edge localized modes based on a multi-mode plasma response Gu, S.; Wan, B.; Sun, Y. Nuclear Fusion, Vol. 59, Issue 12 https://doi.org/10.1088/1741-4326/ab4566	journal	October 2019

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