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Design of an ICRF system for plasma-wall interactions and RF plasma production studies on TOMAS
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2017 (English)In: Fusion engineering and design, ISSN 0920-3796, E-ISSN 1873-7196, Vol. 123, p. 317-320Article in journal (Refereed) Published
Abstract [en]

Ion cyclotron wall conditioning (ICWC) is being developed for ITER and W7-X as a baseline conditioning technique in which the ion cyclotron heating and current drive system will be employed to produce and sustain the currentless conditioning plasma. The TOMAS project (TOroidal MAgnetized System, operated at the FZ-juelich, Germany) proposes to explore several key aspects of ICWC. For this purpose we have designed an ICRF system made of a single strap antenna within a metallic box, connected to a feeding port and a pre-matching system. We discuss the design work of the antenna system with the help of the commercial electromagnetic software CST Microwave Studio (R). The simulation results for a given geometry provide input impedance matrices for the two-port system. These matrices are afterwards inserted into various circuit models to assess the accessibility of the required frequency range. The sensitivity of the matching system to uncertainties on plasma loading and capacitance values is notably addressed. With a choice of three variable capacitors we show that the system can cope with such uncertainties. We also demonstrate that the system can cope as well with the high reflected power levels during the short breakdown phase of the RF discharge, but at the cost of a significantly reduced coupled power.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA , 2017. Vol. 123, p. 317-320
Keywords [en]
ICWC, Antennas, Capacitors, TOMAS, Matching, Simulations
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-221890DOI: 10.1016/j.fusengdes.2017.04.123ISI: 000418992000063OAI: oai:DiVA.org:kth-221890DiVA, id: diva2:1178760
Conference
29th Symposium on Fusion Technology (SOFT), SEP 05-09, 2016, Prague, CZECH REPUBLIC
Note

QC 20180130

Available from: 2018-01-30 Created: 2018-01-30 Last updated: 2018-01-30Bibliographically approved

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Petersson, PerRubel, Marek

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  • apa
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