skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

This content will become publicly available on March 25, 2020

Title: Validation of Alfvén Eigenmode simulations on DIII-D and Projection for CFETR scenario

Abstract

Alfvén Eigenmodes (AEs) are driven unstable by on-axis neutral beam (NB) injection in DIII-D reversed magnetic shear discharges #166496 and #159243, a high-beta steady-state demonstration discharge and an L-mode current ramp discharge respectively. Here, the experimental results are used to validate the ideal MHD code with kinetic extensions NOVA-K and the gyro-Landau-fluid code TGLFEP. Both codes predict low toroidal mode number (n=1~2) Toroidal Alfvén Eigenmode (TAE) instability in the former discharge and low-n (n=2~6) Reverse Shear Alfvén Eigenmode (RSAE) instability in the latter discharge, consistent with observations. The same two codes are also employed to predict linear AE instabilities driven by α particles in the China Fusion Engineering Test Reactor (CFETR). For the CFETR reversed shear q profile, the growth rates of AEs change periodically with increasing toroidal mode number and the RSAEs near a rational surface always have larger growth rates than TAEs. AEs are found to be further destabilized by addition of 500keV off-axis injected NB. The effects of q-profile variation on AE stability in CFETR are also investigated and the results show that raising q min can further destabilize RSAEs, while increasing q 0 with fixed q min, to create stronger negative magnetic shear, is stabilizing. Finally,more » increasing plasma density is beneficial for AE stability due to reduced fast ion drive because of shorter slowing down time and higher electron collisional damping.« less

Authors:
 [1];  [2];  [3];  [4];  [4];  [3];  [1]
  1. University of Science and Technology of China, Hefei (China). School of Physics
  2. University of Science and Technology of China, Hefei (China). School of Physics; General Atomics, San Diego, CA (United States)
  3. Chinese Academy of Sciences, Hefei (China). Institute of Plasma Physics
  4. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1481885
Grant/Contract Number:  
FC02-04ER54698; SC0017992
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Name: Nuclear Fusion; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CFETR; energetic particle; Alfvén eigenmodes; reverse shear

Citation Formats

Zou, Yunpeng, Chan, Vincent S., Huang, Juan, Collins, C. S., Andrea, A. M., Guo, W. F., and Ye, Minyou. Validation of Alfvén Eigenmode simulations on DIII-D and Projection for CFETR scenario. United States: N. p., 2019. Web. doi:10.1088/1741-4326/ab1300.
Zou, Yunpeng, Chan, Vincent S., Huang, Juan, Collins, C. S., Andrea, A. M., Guo, W. F., & Ye, Minyou. Validation of Alfvén Eigenmode simulations on DIII-D and Projection for CFETR scenario. United States. doi:10.1088/1741-4326/ab1300.
Zou, Yunpeng, Chan, Vincent S., Huang, Juan, Collins, C. S., Andrea, A. M., Guo, W. F., and Ye, Minyou. Mon . "Validation of Alfvén Eigenmode simulations on DIII-D and Projection for CFETR scenario". United States. doi:10.1088/1741-4326/ab1300.
@article{osti_1481885,
title = {Validation of Alfvén Eigenmode simulations on DIII-D and Projection for CFETR scenario},
author = {Zou, Yunpeng and Chan, Vincent S. and Huang, Juan and Collins, C. S. and Andrea, A. M. and Guo, W. F. and Ye, Minyou},
abstractNote = {Alfvén Eigenmodes (AEs) are driven unstable by on-axis neutral beam (NB) injection in DIII-D reversed magnetic shear discharges #166496 and #159243, a high-beta steady-state demonstration discharge and an L-mode current ramp discharge respectively. Here, the experimental results are used to validate the ideal MHD code with kinetic extensions NOVA-K and the gyro-Landau-fluid code TGLFEP. Both codes predict low toroidal mode number (n=1~2) Toroidal Alfvén Eigenmode (TAE) instability in the former discharge and low-n (n=2~6) Reverse Shear Alfvén Eigenmode (RSAE) instability in the latter discharge, consistent with observations. The same two codes are also employed to predict linear AE instabilities driven by α particles in the China Fusion Engineering Test Reactor (CFETR). For the CFETR reversed shear q profile, the growth rates of AEs change periodically with increasing toroidal mode number and the RSAEs near a rational surface always have larger growth rates than TAEs. AEs are found to be further destabilized by addition of 500keV off-axis injected NB. The effects of q-profile variation on AE stability in CFETR are also investigated and the results show that raising qmin can further destabilize RSAEs, while increasing q0 with fixed qmin, to create stronger negative magnetic shear, is stabilizing. Finally, increasing plasma density is beneficial for AE stability due to reduced fast ion drive because of shorter slowing down time and higher electron collisional damping.},
doi = {10.1088/1741-4326/ab1300},
journal = {Nuclear Fusion},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on March 25, 2020
Publisher's Version of Record

Save / Share: