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Sub-divertor fuel isotopic content detection limit for JET and its impact on ICRF core heating and DTE2 operationsupa/sup
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SYSNO ASEP 0538970 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Sub-divertor fuel isotopic content detection limit for JET and its impact on ICRF core heating and DTE2 operationsupa/sup Author(s) Klepper, C.C. (US)
Pégourié, B. (FR)
Vartanian, S. (FR)
Goniche, M. (FR)
Delabie, E. (US)
Van Eester, D. (BE)
Lerche, E. (BE)
Sips, G. (GB)
Borodkina, Irina (UFP-V)
Douai, D. (FR)
Jepu, I. (RO)
Kruezi, U. (GB)
Matthews, G. F. (GB)
Widdowson, A. (GB)Number of authors 14 Article number 016021 Source Title Nuclear Fusion. - : Institute of Physics Publishing - ISSN 0029-5515
Roč. 60, č. 1 (2020)Number of pages 10 s. Language eng - English Country AT - Austria Keywords Fusion fuel isotopic content ; iter ; jet dte2 ; JET ITER-like wall ; Magnetic fusion energy ; Residual gas analysis Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 000499369800001 EID SCOPUS 85081050853 DOI 10.1088/1741-4326/AB4C5A Annotation The ability to detect and control fuel isotopic content down to a 1% concentration level is greatly important for the upcoming JET DTE2 campaign, as well as its associated TT and DD phases. A reduction of H minority concentration even from 2% down to 1% is shown here to have significant impact on the effectiveness of ion cyclotron range of frequencies core heating, while the ability to maintain T or D concentration at or below 1% is critical to limiting fusion neutron generation in the DD and TT phases, correspondingly. The sub-divertor measurement of (global) isotopic concentration, based on Penning-activated optical spectroscopy, can deliver minimally this 1% detection for DTE2 as long as light collection from the Penning emission can be optimized and gradual window transmission deterioration can be minimized. This is simulated with a statistical analysis developed to understand the uncertainty sources in the JET DTE1 data, as well as to guide the optimization of an upgraded, fuel-isotopic content (and helium-ash concentration) gas analysis system for the JET divertor in preparation for DTE2. While this random error can be reduced to allow measurement substantially below 1% concentration, analysis also shows a systematic error of up to 1% understood to be due to plasma–surface interactions in the Penning excitation, suggesting that 1% may still be the low-end limit for the sub-divertor measurement, unless a Penning-source conditioning approach is also developed. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2021 Electronic address https://iopscience.iop.org/article/10.1088/1741-4326/ab4c5a
Number of the records: 1