Status of the Design of the ITER ECE Diagnostic
Authors: Gary Taylor, et. al.
Abstract: 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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Submitted to: 18th Joint Workshop on Electron Cyclotron Emmision and Electron Cyclotron Resonance Heating, Nara, Japan (April 2014)
OSTI ID: 1148889
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Download PPPL-5026 (pdf 9.20 MB 7 pp)
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