Status of the design of the ITER ECE diagnostic

Taylor G.; Austin M. E.; Beno J. H.; Danani S.; Ellis R. F.; Feder R.; Hesler J. L.; Hubbard A. E.; Johnson D. W.; Kumar R.; Kumar S.; Kumar V.; Ouroua A.; Pandya H. K. B.; Phillips P. E.; Roman C.; Rowan W. L.; Udintsev V.; Vayakis G.; Walsh M.

doi:10.1051/epjconf/20158703002

EPJ Web of Conferences (Jan 2015)

Status of the design of the ITER ECE diagnostic

Taylor G.,
Austin M. E.,
Beno J. H.,
Danani S.,
Ellis R. F.,
Feder R.,
Hesler J. L.,
Hubbard A. E.,
Johnson D. W.,
Kumar R.,
Kumar S.,
Kumar V.,
Ouroua A.,
Pandya H. K. B.,
Phillips P. E.,
Roman C.,
Rowan W. L.,
Udintsev V.,
Vayakis G.,
Walsh M.

Affiliations

Taylor G.: Princeton Plasma Physics Laboratory
Austin M. E.: Institute for Fusion Studies, University of Texas at Austin
Beno J. H.: Center for Electromechanics, University of Texas at Austin
Danani S.: ITER-India/Institute for Plasma Research
Ellis R. F.: University of Maryland
Feder R.: Princeton Plasma Physics Laboratory
Hesler J. L.: Virginia Diodes, Inc.
Hubbard A. E.: Plasma Science and Fusion Center, MIT
Johnson D. W.: Princeton Plasma Physics Laboratory
Kumar R.: ITER-India/Institute for Plasma Research
Kumar S.: ITER-India/Institute for Plasma Research
Kumar V.: ITER-India/Institute for Plasma Research
Ouroua A.: Center for Electromechanics, University of Texas at Austin
Pandya H. K. B.: ITER-India/Institute for Plasma Research
Phillips P. E.: Institute for Fusion Studies, University of Texas at Austin
Roman C.: Princeton Plasma Physics Laboratory
Rowan W. L.: Institute for Fusion Studies, University of Texas at Austin
Udintsev V.: ITER Organization
Vayakis G.: ITER Organization
Walsh M.: ITER Organization

DOI: https://doi.org/10.1051/epjconf/20158703002
Journal volume & issue: Vol. 87
p. 03002

Abstract

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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.

Published in EPJ Web of Conferences

ISSN: 2100-014X (Online)
Publisher: EDP Sciences
Country of publisher: France
LCC subjects: Science: Physics
Website: http://www.epj-conferences.org/

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