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Title 161: n=3 offset and ELM suppression with RMP
Name:Raffi Nazikian nazikian@fusion.gat.com Affiliation:General Atomics
Research Area:ELM Control Presentation time: Not requested
Co-Author(s): ITPA Joint Experiment : No
Description: Scan the n=3 offset with phase flips of the n=3 RMP in order to identify whether there are island structures at the top of the pedestal. Basically, we want to extend the offset level beyond previous offsets so that a minimum in the offset can be clearly identified by the minimum in the beta modulation. With the new 3-D coil set the offset can be better diagnosed. In addition the thicker filter planned for X-ray imaging will be more sensitive to core structures. The combination of the optimum offset with the new mgnetics and the thicker filter will be very effective in studying the existence of islands. In addition, performing this at several values of q-95 will help to identify the existence of an island response at the top of the pedestal. ITER IO Urgent Research Task : Yes
Experimental Approach/Plan: Repeat phase flip experiments of the past campaign, add q-95 scan from shot to shot and optimize the offset with the new magnetics and measure the X-ray images and profile changes.
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