Status of the design of the ITER ECE diagnostic
1 Princeton Plasma Physics Laboratory, Princeton, NJ 08543, USA
2 Institute for Fusion Studies, University of Texas at Austin, TX 78712, USA
3 Center for Electromechanics, University of Texas at Austin, TX 78758, USA
4 ITER-India/Institute for Plasma Research, Bhat 382428, Gandhinagar, India
5 University of Maryland, College Park, MD 20742, USA
6 Virginia Diodes, Inc. Charlottesville, VA 22902, USA
7 Plasma Science and Fusion Center, MIT, Cambridge, MA 02139, USA
8 ITER Organization, Route de Vinon sur Verdon, 13115, St Paul Lez Durance, France
a Corresponding author: firstname.lastname@example.org
Published online: 12 March 2015
The baseline design for the ITER electron cyclotron emission (ECE) diagnostic has entered the detailed preliminary design phase. Two plasma views are planned, a radial view and an oblique view that is sensitive to distortions in the electron momentum distribution near the average thermal momentum. Both views provide high spatial resolution electron temperature profiles when the momentum distribution remains Maxwellian. The ECE diagnostic system consists of the front-end optics, including two 1000 K calibration sources, in equatorial port plug EP9, the 70-1000 GHz transmission system from the front-end to the diagnostics hall, and the ECE instrumentation in the diagnostics hall. The baseline ECE instrumentation will include two Michelson interferometers that can simultaneously measure ordinary and extraordinary mode ECE from 70 to 1000 GHz, and two heterodyne radiometer systems, covering 122-230 GHz and 244-355 GHz. Significant design challenges include 1) developing highly-reliable 1000 K calibration sources and the associated shutters/mirrors, 2) providing compliant couplings between the front-end optics and the polarization splitter box that accommodate displacements of the vacuum vessel during plasma operations and bake out, 3) protecting components from damage due to stray ECH radiation and other intense millimeter wave emission and 4) providing the low-loss broadband transmission system.
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