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	125: Observation of non-linear interactions in fast-ion loss spectra
Name:	Gerrit Kramer gkramer@pppl.gov	Affiliation:	Princeton Plasma Physics Laboratory
Research Area:	Energetic Particles	Presentation time:	Not requested
Co-Author(s):	Xi Chen and the fast-particle group	ITPA Joint Experiment :	No
Description:	Alfven Eigenmode (AE) induced beam-ion losses after one poloidal transit have been observed during the current ramp phase in standard DIII-D discharges for studying AEs. Those modes are a good tool to study details of the wave-particle interaction. In those experiments a non-linear coupling between reversed shear AEs (RSAE) and toroidicity induced AEs (TAE) has been observed in the loss spectra as measured with FILD. We would like to study the behaviour of the non-linear interaction when the q-profile relaxes from reversed shear to normal shear.	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	Create a standard DIII-D AE discharge (pulse 146096) and stop the current ramp at 0.6 MA when the AE-induced "prompt" losses from the 30L beam reach the FILD-2 detector and observe the evolution of the losses. Repeat the experiment and stop the current ramp at 0.73 MA when the AE-induced "prompt" losses from the 330L beam reach FILD-2 detector.
Background:	--
Resource Requirements:	30L and 330L beams
Diagnostic Requirements:	FILD-2, ECEI, MSE, FIDA, all fast-ion diagnostics
Analysis Requirements:	Main analysis codes: EFIT, NOVA, SPIRAL
Other Requirements:	--