Sub-divertor fuel isotopic content detection limit for JET and its impact on ICRF core heating and DTE2 operation - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Nuclear Fusion Année : 2020

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

Résumé

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.

Dates et versions

hal-03742867 , version 1 (02-08-2022)

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Citer

C. C. Klepper, B. Pégourié, S. Vartanian, M. Goniche, E. Delabie, et al.. Sub-divertor fuel isotopic content detection limit for JET and its impact on ICRF core heating and DTE2 operation. Nuclear Fusion, 2020, 60, pp.016021. ⟨10.1088/1741-4326/ab4c5a⟩. ⟨hal-03742867⟩

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