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| Hauptseite > Publikationsdatenbank > Use of new He II atomic data in JET EDGE2D-EIRENE simulations |
| Hauptseite > Publikationsdatenbank > Use of new He II atomic data in JET EDGE2D-EIRENE simulations |
| Abstract | FZJ-2021-01433 |
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2021
Abstract: Use ofnew He II atomicdata inJETEDGE2D-EIRENE simulationsK D Lawson1, M Groth2, D Harting1,S Menmuir1,K M Aggarwal4, S Brezinsek3, I H Coffey1,4, G Corrigan1, F P Keenan4, C F Maggi1, A G Meigs1, M G O’Mullane5, S Wiesen3& JET Contributors*EUROfusion Consortium, JET, Culham Science Centre, Abingdon, OX14 3DB, UK1CCFE, Culham Science Centre, Abingdon, OX14 3DB, UK2Aalto University, Otakaari 1, Espoo, 02150, Finland3Forschungszentrum Jülich Gmbh, Institut für Energie-und Klimaforschung –Plasmaphysik, 52425 Jülich, Germany4Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University Belfast, Belfast, BT7 1NN, Northern Ireland, UK5Depart. of Physics, University of Strathclyde, Glasgow, G4 0NG, UKPresent day large plasma machines use a divertorcontaining a cold, dense plasma to act as a buffer between the hot core and the plasma facing material surfaces, providingprotection forthese surfaces. The accurate prediction of the behaviour of the divertor plasma, including the power radiated by fuel and impurity species, is therefore crucial and requires transport modelling of the plasma edge and divertor. Suchtransport codes rely on the availability of accurate atomic and molecular data both for the fuel and impurity species. Recent workhas resulted in a new atomic dataset for hydrogenic He II (He+)[1,2]and this is being tested in EDGE2D-EIRENE simulations. Heliumis widely used in laboratory fusion experiments both as a fuel asin the first, non-nuclearphase of ITER, as a minority gas for RF heatingand will occur asash fromthe thermonuclear reactions. Theuseof He also has the advantage of testing the connection ofthe atomic physics data with the transport codes without the confusion that can result from the emissionfrom molecules which cannot be avoided in D fuelled simulations. This is particularly pertinent sinceextra terms relating to the potential energy are sometimesincluded when the transport model accesses the atomic data, these in addition to the required kinetic energy contributions. This is the case whenthe EDGE2D transport code accesses atomic data contained inthe ADAS databaseand it is necessaryto understand whether the differences due to these potential energy terms are significant. Although agreement between ADASand the new datahas been found for the modelled power radiated by He II, there are significant differences for other terms affectingthe electron power lossused in the simulations, particularly at low temperatures. Lawson et al.[3] demonstrated that the simulated temperatures were particularly sensitive to this term and thismay limit the lowest temperatures that can be achieved in the simulations. Since the radiated power increaseswith decreasing temperature,anyrestriction of the temperaturecouldexplain the previously observed discrepancy in the measured and simulated radiated powers [4,5].EDGE2D-EIRENE simulations for discharges with a high concentration (~80-90%) of He are being run to compare the effect of using ADASdataand the new He II atomic database.[1] Lawsonet al., 2019, J. Phys. B, 52, 045001 [2] Lawsonet al.,2019,To be submitted to J.Phys. B[3] Lawson et al.,2018, Proc. 45thEPS Conf., Prague [4] Groth et al., 2013, Nuc. Fus., 53, 093016 [5] Caniket al.,2017,Phys. of Plas., 24, 056116*See the author list ofE. Joffrinet al., to be published inNucl. FusionSpecial Issue, overview and summary reports from the 27thFusion Energy Conference (Ahmedabad, India, Oct. 2018)
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