Title
Design and analysis of first mirror plasma cleaning electrical circuit for Edge Thomson scattering ITER diagnostics
Author
Stephan, U.
Steinke, O.
Ushakov, A.
Verlaan, A.L.
Yatsuka, E.
Yokoyama, M.
Rijfers, A.
C.A. Ribeiro, D.
Moser, L.
Bassan, M.
Maniscalco, M.P.
van Beekum, E.R.J.
Hatae, T.
Publication year
2022
Abstract
The ITER Edge Thomson scattering system provides measurements of the electron temperature and density profiles at the periphery plasma of the ITER tokamak for physics studies and advanced plasma control. The frontend of the system contains a relatively large 23 cm × 25.8 cm metal first mirror (FM). Radio-frequency plasma is considered to remove contaminants from the FM. The new design approach for the power transmission circuit for plasma cleaning includes a pre-matching element next to the FM and a notch-filter. The FM is water-cooled and the water cooling pipe length is tuned as a notch filter for the driving frequency. The power dissipation in the circuit elements was analyzed in a series of simulations at frequencies 30, 40 and 50 MHz. New plasma impedance values used for the model were measured in argon and helium plasma at 1–10 Pa in a special mock-up of the front-end optics compartment. The results define inductance, capacitance and geometry of pre-matching elements and help to predict the performance of the plasma cleaning circuit.
Subject
Edge Thomson scattering
ITER diagnostics
First mirror
Plasma cleaning
Radio-frequency discharges
RF cables
Vacuum
Notch filter
High Tech Systems & Materials
Industrial Innovation
To reference this document use:
http://resolver.tudelft.nl/uuid:df616cf4-1440-44dd-9c3d-cf78235ce74c
TNO identifier
965924
Publisher
Elsevier, Amsterdam
ISSN
0920-3796
Source
Fusion Engineering and Design, 177 (177)
Document type
article