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Title	73: Test optimized TBM error field correction at higher values of beta
Name:	Holger Reimerdes reimerdes@fusion.gat.com	Affiliation:	CRPP-EPFL
Research Area:	Stability & Disruption Avoidance	Presentation time:	Requested
Co-Author(s):	J. Hanson, R. La Haye, M. Lanctot, N. Oyama, C. Paz-Soldan, J. Snipes	ITPA Joint Experiment :	No
Description:	This experiment will test the hypothesis that n=1 TBM error field correction (EFC) can suppress the deterioration of confinement with increasing beta once beta normalized exceeds values of approximately 2.0 [H. Reimerdes, et al., IAEA 2012]. A confirmation of this hypothesis would be a favorable result for ITER.	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	The empirically optimized n=1 I-coil EFC currents found in 2011 will be applied in the corresponding TBM reference scenario (ELMy H-mode, q95~4.1, beta normalized~1.8, co-NBI) and beta increased. Any increase in the torque due to the TBM field and energy and particle confinement degradation will be compared against a case with optimized EFC of the intrinsic error alone. In order to check that the optimized currents do not change with beta small scans around the previously found currents will be applied. Such changes can for example be caused by the changing PF coil currents. The capability of the EFC currents to suppress the n=1 magnetic plasma response to the TBM field can also guide an empiric optimization (possibly by using magnetic feedback, i.e. dynamic error field correction).
Background:
Resource Requirements:	- TBM mock-up coil - 5 co-NBI
Diagnostic Requirements:
Analysis Requirements:
Other Requirements: