Abstract Details
| status: | file name: | submitted: | by: |
|---|---|---|---|
| approved | sher23a.pdf | 2023-05-03 02:21:34 | Henry Strauss |
Abstracts
Author: Henry Strauss
Requested Type: Consider for Invited
Submitted: 2023-03-16 05:38:37
Co-authors: B.E. Chapman, B.C. Lyons
Contact Info:
HRS Fusion
2 Januson Ct.
West Orange, NJ 07052
United States
Abstract Text:
A critical issue in ITER disruptions is the thermal load during the thermal quench (TQ), which depends on the TQ duration. Theory and simulations of JET [1] , ITER [2],
DIII-D [3] and Madison Symmetric Torus (MST) [4] indicate that the TQ is
caused by a resistive wall tearing mode (RWTM). This is consistent with JET, DIII-D, and MST experimental data. The mode growth time and the TQ time depend on the resistive wall penetration time, which is two orders of magnitude longer in ITER and MST than in JET and DIII-D.
Nonlinear simulations demonstrate that the RWTM grows to sufficient amplitude to cause a complete thermal quench. An onset condition for the RWTM is that the
q = 2 rational surface is sufficiently close to the resistive wall, so that a tearing mode is stable with an ideal wall and unstable with a resistive wall. A second condition is a threshold in internal inductance, which is related to contraction of the current profile caused by edge cooling.
The implication for ITER is that the TQ could be much milder than previously predicted, relaxing the requirements for disruption mitigation.
[1] H. Strauss and JET Contributors, Phys. Plasmas 28, 032501 (2021).
[2] H. Strauss, Phys. Plasmas 28, 072507 (2021).
[3] H. Strauss, B. C. Lyons, M. Knolker, Phys. Plasmas 29, 112508 (2022).
[4] H. R. Strauss, B. E. Chapman, N. C. Hurst, arXiv 2302.11926, submitted to PPCF (2023).
Comments: