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Title: Sub-divertor fuel isotopic content detection limit for JET and its impact on ICRF core heating and DTE2 operation

Abstract

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 in this paper 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. Here, 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 tomore » 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.« less

Authors:
ORCiD logo [1];  [2];  [2];  [2]; ORCiD logo [1];  [3];  [3];  [4];  [5];  [2];  [4];  [4];  [4]; ORCiD logo [4]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. French Alternatives Energies and Atomic Energy Commission (CEA), Saint Paul-lez-Durance (France). Inst. for Magnetic Fusion Research (IRFM)
  3. Royal Military Academy, Brussels (Belgium)
  4. Culham Science Centre (United Kingdom and Northern Ireland)
  5. Forschungszentrum Jülich GmbH (Germany)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC); Euratom
Contributing Org.:
EUROfusion Consortium; JET ICRH Team; JET Contributors
OSTI Identifier:
1649148
Grant/Contract Number:  
AC05-00OR22725; 633053
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 60; Journal Issue: 1; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; JET ITER-like wall; residual gas analysis; ITER; magnetic fusion energy; fusion fuel isotopic content; JET DTE2

Citation Formats

Klepper, C. C., Pégourié, B., Vartanian, S., Goniche, M., Delabie, E., Van Eester, D., Lerche, E., Sips, G., Borodkina, I., Douai, D., Jepu, I., Kruezi, U., Matthews, G. F., and Widdowson, A.. Sub-divertor fuel isotopic content detection limit for JET and its impact on ICRF core heating and DTE2 operation. United States: N. p., 2019. Web. https://doi.org/10.1088/1741-4326/ab4c5a.
Klepper, C. C., Pégourié, B., Vartanian, S., Goniche, M., Delabie, E., Van Eester, D., Lerche, E., Sips, G., Borodkina, I., Douai, D., Jepu, I., Kruezi, U., Matthews, G. F., & Widdowson, A.. Sub-divertor fuel isotopic content detection limit for JET and its impact on ICRF core heating and DTE2 operation. United States. https://doi.org/10.1088/1741-4326/ab4c5a
Klepper, C. C., Pégourié, B., Vartanian, S., Goniche, M., Delabie, E., Van Eester, D., Lerche, E., Sips, G., Borodkina, I., Douai, D., Jepu, I., Kruezi, U., Matthews, G. F., and Widdowson, A.. Thu . "Sub-divertor fuel isotopic content detection limit for JET and its impact on ICRF core heating and DTE2 operation". United States. https://doi.org/10.1088/1741-4326/ab4c5a. https://www.osti.gov/servlets/purl/1649148.
@article{osti_1649148,
title = {Sub-divertor fuel isotopic content detection limit for JET and its impact on ICRF core heating and DTE2 operation},
author = {Klepper, C. C. and Pégourié, B. and Vartanian, S. and Goniche, M. and Delabie, E. and Van Eester, D. and Lerche, E. and Sips, G. and Borodkina, I. and Douai, D. and Jepu, I. and Kruezi, U. and Matthews, G. F. and Widdowson, A.},
abstractNote = {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 in this paper 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. Here, 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.},
doi = {10.1088/1741-4326/ab4c5a},
journal = {Nuclear Fusion},
number = 1,
volume = 60,
place = {United States},
year = {2019},
month = {11}
}

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