DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2013 EXPERIMENTAL CAMPAIGN Review | Direct submission with log-in | Request submission without log-in
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Title	82: IR Imaging of I-coil Induced Fast Ion Losses
Name:	Michael Van Zeeland vanzeeland@fusion.gat.com	Affiliation:	General Atomics
Research Area:	Energetic Particles	Presentation time:	Not requested
Co-Author(s):	W. Heidbrink, C. Lasnier	ITPA Joint Experiment :	Yes
Description:	The goal of this experiment is to use the LLNL IR/Visible periscope to investigate fast ion losses from I-coil imposed field perturbations.	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	This experiment will reproduce shot 150417 from 8/16/12, which utilized a 25Hz rotating n=2 I-coil field applied to a small circular plasma and was observed to induce measurable fast ion losses. The fast ion heat load on the wall will be monitored with the LLNL IR periscope for no applied field, applied rotating field, and successive shots with the field phasing stepped toroidally but held constant during a given shot. Fast ion losses will also be monitored with both FILDs, and the impact of the fields on the plasma will be measured with BES imaging, lithium beam spectroscopy, and reflectometry. Note, this proposal is for a half-day experiment or less.
Background:	Energetic particle populations in tokamaks exhibit increased transport and possible loss due to the presence of non-axisymmetric (3D) fields such as those arising from test blanket modules, internal MHD instabilities, toroidal field ripple, general error fields, and edge localized mode/resistive wall mode (ELM/RWM) control coils. Losses of energetic particles cause localized heating with the potential to damage first wall components, making this an important practical issue for future burning plasma experiments, particularly for those considering coil sets to specifically impose non-axisymmetric fields. Fast ion losses due to TBMs were studied in detail in recent DIII-D experiments and in August 2012, an experiment to investigate I-coil induced losses due to a rotating n=2 perturbation was also carried out. During planning, it was hoped the new LLNL IR periscope would be available to monitor the heat footprint of lost fast ions on the wall but the experiment was carried out before the full camera installation was complete.
Resource Requirements:	210R, 30L, n=2 even parity icoil
Diagnostic Requirements:	IR Periscope, FILD
Analysis Requirements:
Other Requirements: