Design and Predicted Performance for the ITER Electron Cyclotron Emission Diagnostic System
POSTER
Abstract
One of the primary diagnostics for measurement of the electron temperature (Te) on ITER is based on the detection of electron cyclotron emission (ECE). Here we describe the predicted performance of the newly completed ECE diagnostic design in fulfilling the diverse roles required by ITER. These roles include conventional measurement of Te, detection of instabilities and MHD modes, and support for runaway measurements. While the primary focus is on operation at the full ITER field of 5.3 T, critical features of the emission spectra during pulse ramp-up and termination are also addressed. ECE will be collected by two nearly identical optical systems: one providing a radial view and the other an oblique view. Both views are used for Te measurements, while the oblique view additionally enables detection of non-thermal distortions in the electron momentum distribution. An in-vacuum calibration source is integrated into the front end of each view to account for potential degradation of in-vessel optics. The design of the radiometers used for 5.3 T will be described in detail.
*Work supported by the U.S. DOE under Contract No. DE-AC02-09CH11466 with Princeton University and Contract No. DE-FG02-04ER54742. All U.S. ITER activities are managed by the U.S. ITER Project Office, hosted by Oak Ridge National Laboratory with partner labs Princeton Plasma Physics Laboratory and Savannah River National Laboratory. The project is being accomplished through a collaboration of DOE Laboratories, universities, and industry. The views and opinions expressed herein do not necessarily reflect those of the ITER Organization.
Presenters
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William L Rowan
- University of Texas at Austin