Characterisation of divertor detachment onset in JET-ILW hydrogen, deuterium, tritium and deuterium–tritium low-confinement mode plasmas

Groth, M.; Solokha, V.; Aleiferis, S.; Brezinsek, S.; Brix, M.; Carvalho, I. S.; Carvalho, P.; Corrigan, G.; Harting, D.; Horsten, N.; Jepu, I.; Karhunen, J.; Kirov, K.; Lomanowski, B.; Lawson, K. D.; Lowry, C.; Meigs, A. G.; Menmuir, S.; Pawelec, E.; Pereira, T.; Shaw, A.; Silburn, S.; Thomas, B.; Wiesen, S.; Börner, P.; Borodin, D.; Jachmich, S.; Reiter, D.; Sergienko, G.; Stancar, Z.; Viola, B.; Beaumont, P.; Bernardo, J.; Coffey, I.; Conway, N. J.; de la Luna, E.; Douai, D.; Giroud, C.; Hillesheim, J.; Horvath, L.; Huber, A.; Lomas, P.; Maggi, C. F.; Maslov, M.; Perez von Thun, C.; Scully, S.; Vianello, N.; Wischmeier, M.

doi:10.1016/j.nme.2022.101345

Characterisation of divertor detachment onset in JET-ILW hydrogen, deuterium, tritium and deuterium–tritium low-confinement mode plasmas

Journal Article · Wed Dec 21 04:00:00 EST 2022 · Nuclear Materials and Energy

DOI:https://doi.org/10.1016/j.nme.2022.101345· OSTI ID:1985347

Groth, M. ^[1]; Solokha, V.; Aleiferis, S.; Brezinsek, S.; Brix, M.; Carvalho, I. S.; Carvalho, P.; Corrigan, G.; Harting, D.; Horsten, N.; Jepu, I.; Karhunen, J.; Kirov, K.; Lomanowski, B.; Lawson, K. D.; Lowry, C.; Meigs, A. G.; Menmuir, S.; Pawelec, E.; Pereira, T. more »

Aalto University, Otaniemi (Finland). JET Contributors. et al.

Measurements of the ion currents to and plasma conditions at the low-field side (LFS) divertor target plate in low-confinement mode plasmas in the JET ITER-like wall materials configuration show that the core plasma density required to detach the LFS divertor plasma is independent of the hydrogenic species protium, deuterium and tritium, and a 40 %/60 % deuterium–tritium mixture. This observation applies to a divertor plasma configuration with the LFS strike line connected to the horizontal part of the LFS divertor chosen because of its superior diagnostic coverage. The finding is independent of the operational status of the JET cryogenic pump. The electron temperature (T_e) at the LFS strike line was markedly reduced from 25 eV to 5 eV over a narrow range of increasing core plasma density, and observed to be between 2 eV and 3 eV at the onset of detachment. The electron density (n_e) peaks across the LFS plasma when T_e at the target plate is 1 eV, and spatially moves to the X-point for higher core densities. The density limit was found approximately 20 % higher in protium than in tritium and deuterium–tritium plasmas.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; European Union; European Commission; Polish Ministry of Science and Higher Education

Contributing Organization:: JET Contributors

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1985347

Journal Information:: Nuclear Materials and Energy, Journal Name: Nuclear Materials and Energy Journal Issue: 1 Vol. 34; ISSN 2352-1791

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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