Simultaneous H/D/T and 3He/4He absolute concentration measurements with an optical Penning gauge on JET

Conference · Wed Sep 01 04:00:00 EDT 2021

DOI:https://doi.org/10.1016/j.fusengdes.2021.112511· OSTI ID:1813243

Vartanian, S. ^[1]; Delabie, Ephrem G. ^[2]; Klepper, C. Christopher ^[2]; Jepu, Ionut ^[3]; Jacquet, P. ^[3]; Lerche, E. ^[4]; Lomanowski, Bart ^[2]; Colas, L. ^[1]; Douai, D. ^[1]; Widdowson, A ^[5]

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1. French Atomic Energy Commission (CEA), Institute for Magnetic Fusion Research (IRFM)
2. ORNL
3. Culham Centre for Fusion Energy (CCFE), Abingdon, UK
4. Laboratory for Plasma Physics-ERM/KMS (LPP-ERM/KMS), Brussels, Belgium
5. UK Atomic Energy Authority (UKAEA)

The Optical Penning (or Species-Selective Penning) Gauge technique is used for the measurement of the H2/D2/T2 fuel isotopic composition and He/D2 concentration in the neutralized particle exhaust of fusion devices. An Optical Penning detection system has already been used in JET during its first deuterium-tritium campaigns (DTE1) and has been chosen by ITER. Recent improvements to the sub-divertor diagnostic suite as well as the optical instrumentation, in preparation for the next DT campaign, have improved the optical throughput of the measurement and enabled 3He/D2 detection down to 0.1 %. For the first time, the 3He/4He isotopic ratio can be measured simultaneously with the H/D/T ratio. This technique is of particular interest for ion cyclotron resonance frequency (ICRF) heating scenarios.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE; USDOE Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1813243
• Country of Publication: United States
• Language: English