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000891504 005__ 20240709082153.0
000891504 037__ $$aFZJ-2021-01570
000891504 1001_ $$0P:(DE-HGF)0$$aHwang, J. H.$$b0
000891504 1112_ $$a24th International Conference on Plasma Surface Interactions in Controlled Fusion Devices (PSI 2020)$$cvirtuell$$d2021-01-25 - 2021-01-29$$wvirtuell
000891504 245__ $$aExperimental studies of H-mode divertor detachment with deuterium gas injection in KSTAR plasmas
000891504 260__ $$c2021
000891504 3367_ $$0PUB:(DE-HGF)1$$2PUB:(DE-HGF)$$aAbstract$$babstract$$mabstract$$s1636545643_7654
000891504 3367_ $$033$$2EndNote$$aConference Paper
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000891504 520__ $$aExperimental studies of H-mode divertor detachmentwith D2 injection in KSTARJ. H. Hwanga, J.-S. Parkb, R. Pittsb, H. H. Leec, J.-W. Juhnc, J. Jangc,J. G. Bakc,S. Wiesend, M. Bernerte,S.-H. Hongc, and W. Choea a KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Koreab ITEROrganization, Route de Vinon-sur-Verdon, CS 90 046, 13067 St. Paul Lez Durance Cedex, FrancecNational Fusion Research Institute, 169-148 Gwahak-ro, Yuseong-gu,Daejeon 34133, KoreadForschungszentrum Jülich GmbH, Institut für Energie-und Klimaforschung -Plasmaphysik, D-52425 Jülich, GermanyeMax Planck Institute for Plasma Physics, Boltzmannstraße 2, 85748 Garching, Germanyhoo1021@kaist.ac.kr; wchoe@kaist.ac.krSince H-mode has beenregarded as a promising operating scenario for future tokamaks, it is important to get a good understanding of divertor detachment in H-mode plasmas.So far the extensive detachment studies in KSTAR focused on L-mode plasmas [1]. Therefore, H-mode detachmentstudies with pure deuterium fuelled discharges with no impurity gas seedingcan bethe baseline starting point for further complex studies of detachment under impurity injections or ELMcontrolled/suppressed 3D field configurations in KSTAR. In this study, the first signs of  H-mode  divertor  detachmentby  deuterium  gas  injectionin  KSTARwere  obtained  in electron density ramp discharges.The discharges in this study had Ip=0.7 MA and Bt= 1.8 T with ∇B-drift  directed  downward  into  the  lower  divertor.  The  total  NBI  heating  power  was 2.9-3.1  MW.  In  the  experiment,  the  outer  target  showed  a  partially  detached  regime  and  the inter-ELM  peak  particle  flux  was  reduced  significantly  by  a  factor  of  5  to  below 2.0x1022m-2s-1. At the inner target, particle flux roll-over occurred although there  was  not  significant reduction  of  the  inter-ELM  peak  particle  flux.The  line-integrated  density  rose  up  to about 6.0x1019m-3(fGW≈0.8) and further density increase for accessing pronounced detachment was failed by arriving at the H-mode density limit [2]. Theanomalous in/out detachment asymmetry in  which  the  outer  target  detaches  at  the  lower  core  density  than  the  inner  target  has  been observedin KSTAR L-mode plasmas [1]and it wasshown that the asymmetry was reproduced in KSTAR H-mode  plasmas.This  work  will act  as  reference for more  complex H-mode detachment studies to be pursued on KSTARand contribute to better understanding of physics behind divertor detachment.Experimental resultscould give several important constraints to theSOLPS-ITERmodelling  so  that  the  benchmarking  and  predictive  research  regarding KSTAR boundary plasmas will be possible.[1] J.-S. Park, et al., Nucl. Fusion 58 126033 (2018)[2] M. Bernert, et al., Plasma Phys. Control. Fusion 57 014038 (2015)
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000891504 7001_ $$0P:(DE-Juel1)180853$$aPark, J.-S.$$b1
000891504 7001_ $$0P:(DE-HGF)0$$aPitts, R.$$b2
000891504 7001_ $$0P:(DE-HGF)0$$aLee, H. H.$$b3
000891504 7001_ $$0P:(DE-HGF)0$$aJuhn, J.-W.$$b4
000891504 7001_ $$0P:(DE-HGF)0$$aJang, J.$$b5
000891504 7001_ $$0P:(DE-HGF)0$$aBak, J. G.$$b6
000891504 7001_ $$0P:(DE-HGF)0$$aWiesen, S.$$b7$$eCorresponding author
000891504 7001_ $$0P:(DE-HGF)0$$aBernert, M.$$b8
000891504 7001_ $$0P:(DE-HGF)0$$aHong, S.-H.$$b9
000891504 7001_ $$0P:(DE-HGF)0$$aChoe, W.$$b10
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000891504 9141_ $$y2021
000891504 9201_ $$0I:(DE-Juel1)IEK-9-20110218$$kIEK-9$$lGrundlagen der Elektrochemie$$x0
000891504 980__ $$aabstract
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000891504 981__ $$aI:(DE-Juel1)IET-1-20110218