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000891340 037__ $$aFZJ-2021-01433
000891340 1001_ $$0P:(DE-HGF)0$$aLawson, K. D.$$b0
000891340 1112_ $$a24th International Conference on Plasma Surface Interactions in Controlled Fusion Devices (PSI 2020)$$cvirtuell$$d2021-01-25 - 2021-01-29$$wvirtuell
000891340 245__ $$aUse of new He II atomic data in JET EDGE2D-EIRENE simulations
000891340 260__ $$c2021
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000891340 520__ $$aUse 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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000891340 7001_ $$0P:(DE-Juel1)171218$$aGroth, M.$$b1$$ufzj
000891340 7001_ $$0P:(DE-Juel1)177840$$aHarting, D.$$b2$$eCorresponding author$$ufzj
000891340 7001_ $$0P:(DE-HGF)0$$aMenmuir, S.$$b3
000891340 7001_ $$0P:(DE-HGF)0$$aAggarwal, K. M.$$b4
000891340 7001_ $$0P:(DE-Juel1)129976$$aBrezinsek, S.$$b5$$ufzj
000891340 7001_ $$0P:(DE-HGF)0$$aCoffey, I. H.$$b6
000891340 7001_ $$0P:(DE-HGF)0$$aCorrigan, G.$$b7
000891340 7001_ $$0P:(DE-HGF)0$$aP . Keenan, F.$$b8
000891340 7001_ $$0P:(DE-HGF)0$$aMaggi, C. F.$$b9
000891340 7001_ $$0P:(DE-HGF)0$$aMeigs, A. G.$$b10
000891340 7001_ $$0P:(DE-HGF)0$$aO’Mullane, M. G.$$b11
000891340 7001_ $$0P:(DE-HGF)0$$a, S.$$b12
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