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@INPROCEEDINGS{Lawson:891340,
      author       = {Lawson, K. D. and Groth, M. and Harting, D. and Menmuir, S.
                      and Aggarwal, K. M. and Brezinsek, S. and Coffey, I. H. and
                      Corrigan, G. and P . Keenan, F. and Maggi, C. F. and Meigs,
                      A. G. and O’Mullane, M. G. and , S.},
      title        = {{U}se of new {H}e {II} atomic data in {JET}
                      {EDGE}2{D}-{EIRENE} simulations},
      reportid     = {FZJ-2021-01433},
      year         = {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)},
      month         = {Jan},
      date          = {2021-01-25},
      organization  = {24th International Conference on
                       Plasma Surface Interactions in
                       Controlled Fusion Devices (PSI 2020),
                       virtuell (virtuell), 25 Jan 2021 - 29
                       Jan 2021},
      cin          = {IEK-4},
      cid          = {I:(DE-Juel1)IEK-4-20101013},
      pnm          = {134 - Plasma-Wand-Wechselwirkung (POF4-134)},
      pid          = {G:(DE-HGF)POF4-134},
      typ          = {PUB:(DE-HGF)1},
      url          = {https://juser.fz-juelich.de/record/891340},
}