EPJ Web Conf.
Volume 203, 201920th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating (EC20)
|Number of page(s)||6|
|Published online||25 March 2019|
Design and development of the ITER CTS diagnostic
Technical University of Denmark, Department of Physics , 2800 Kgs. Lyngby Denmark
2 Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Univ., Lisboa Portugal
3 Technical University of Denmark, Center for Nuclear Technologies , 4000 Roskilde, Denmark
4 IDMEC, Instituto Superior Técnico, Univ. Lisboa, Lisboa, Portugal
5 Fusion for Energy 08019 Barcelona, Spain
6 ITER Organisation 13115 Saint Paul Lez Durance, France
* Corresponding author: email@example.com
Published online: 25 March 2019
The Collective Thomson Scattering (CTS) diagnostic will be a primary diagnostic for measuring the dynamics of the confined fusion born alpha particles in ITER and will be the only diagnostic for alphas below 1.7 MeV . The probe beam of the CTS diagnostic comes from a 60 GHz 1 MW gyrotron operated in a ~100 Hz modulation sequence. In the plasma, the probing beam will be scattered off fluctuations primarily due to the dynamics of the ions. Seven fixed receiver mirrors will pick up scattered radiation (the CTS signal) from seven measurement volumes along the probe beam covering the cross section of the plasma. The diagnostic is planned to provide a temporal resolution of ~100 ms and a spatial resolution of ~a/4 in the core and ~a/20 near the plasma edge where a = 2.0 m is the nominal minor radius of ITER. The front-end quasi-optics will be installed in an equatorial port plug (EPP#12). A particular challenge will be to pass the probing beam through the fundamental electron cyclotron resonance, which is located in the port plug (R=10.3 m) for the nominal magnetic field Bt = 5.3 T. Hence, particular mitigation actions against arcing have to be applied. The status of the design and specific challenges will be discussed.
© The Authors, published by EDP Sciences, 2019
This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.