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000904062 1001_ $$00000-0003-3588-6801$$aLunsford, R.$$b0
000904062 245__ $$aCharacterization of injection and confinement improvement through impurity induced profile modifications on the Wendelstein 7-X stellarator
000904062 260__ $$a[S.l.]$$bAmerican Institute of Physics$$c2021
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000904062 520__ $$aPulsed injections of boron carbide granules into Wendelstein 7-X stellarator (W7-X) plasmas transiently increase the plasma stored energy and core ion temperatures above the reference W7-X experimental programs by up to 30%. In a series of 4 MW electron cyclotron resonance heating experiments, the PPPL Probe Mounted Powder Injector provided 50 ms bursts of 100 μm granules every 350 ms at estimated quantities ranging from approximately 1 mg/pulse to over 30 mg/pulse. For each injection, the stored energy was observed to initially drop and the radiated power transiently increased, while the radial electron density profile rose at the edge as material was assimilated. Once the injected boron carbide was fully absorbed, the density rise transitioned to the core while the stored energy increased above the previous baseline level by an amount linearly correlated with the injection quantity. During the injection, the ion temperature gradient steepened with peak core ion temperatures observed to increase from a nominal 1.7 keV to over 2.6 keV for the largest injection amounts. Enhanced performance is accompanied by a reversal of the radial electric field at ρ < 0.3, indicating that the core transport has switched to the ion root. These observations are suggestive of a change in transport and provide further evidence that externally induced profile modifications provide a possible path to enhanced W7-X performance metrics.I. INTRODUCTIO
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000904062 7001_ $$00000-0001-7747-3066$$aKiller, C.$$b1
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000904062 7001_ $$00000-0001-5679-3124$$aGates, D. A.$$b3
000904062 7001_ $$0P:(DE-HGF)0$$aKlinger, T.$$b4
000904062 7001_ $$0P:(DE-HGF)0$$aDinklage, A.$$b5
000904062 7001_ $$0P:(DE-Juel1)130135$$aSatheeswaran, G.$$b6
000904062 7001_ $$0P:(DE-HGF)0$$aKocsis, G.$$b7
000904062 7001_ $$00000-0001-8002-0121$$aLazerson, S. A.$$b8
000904062 7001_ $$00000-0001-7644-751X$$aNespoli, F.$$b9
000904062 7001_ $$00000-0001-6617-8459$$aPablant, N. A.$$b10
000904062 7001_ $$00000-0003-0277-4600$$avon Stechow, A.$$b11
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000904062 7001_ $$0P:(DE-HGF)0$$aAndreeva, T.$$b13
000904062 7001_ $$0P:(DE-HGF)0$$aBeurskens, M.$$b14
000904062 7001_ $$00000-0001-9318-7334$$aBiedermann, C.$$b15
000904062 7001_ $$0P:(DE-Juel1)129976$$aBrezinsek, S.$$b16$$eCorresponding author
000904062 7001_ $$00000-0002-0974-0457$$aBrunner, K. J.$$b17
000904062 7001_ $$00000-0002-9830-9641$$aButtenschön, B.$$b18
000904062 7001_ $$00000-0002-7824-3307$$aCarralero, D.$$b19
000904062 7001_ $$00000-0003-4729-8070$$aCseh, G.$$b20
000904062 7001_ $$00000-0003-0121-9058$$aDrewelow, P.$$b21
000904062 7001_ $$0P:(DE-Juel1)137057$$aEffenberg, F.$$b22
000904062 7001_ $$00000-0001-6205-2656$$aEstrada, T.$$b23
000904062 7001_ $$0P:(DE-Juel1)174060$$aFord, O. P.$$b24
000904062 7001_ $$0P:(DE-HGF)0$$aGrulke, O.$$b25
000904062 7001_ $$00000-0003-3396-4511$$aHergenhahn, U.$$b26
000904062 7001_ $$00000-0003-0971-5937$$aHöfel, U.$$b27
000904062 7001_ $$0P:(DE-Juel1)174460$$aKnauer, J.$$b28
000904062 7001_ $$aKrause, M.$$b29
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000904062 7001_ $$0P:(DE-HGF)0$$aNeuner, U.$$b33
000904062 7001_ $$0P:(DE-Juel1)130112$$aNicolai, D.$$b34
000904062 7001_ $$00000-0003-2398-966X$$aPavone, A.$$b35
000904062 7001_ $$0P:(DE-HGF)0$$aPuig Sitjes, A.$$b36
000904062 7001_ $$0P:(DE-HGF)0$$aRahbarnia, K.$$b37
000904062 7001_ $$00000-0002-6363-6554$$aSchilling, J.$$b38
000904062 7001_ $$0P:(DE-HGF)0$$aSvensson, J.$$b39
000904062 7001_ $$0P:(DE-HGF)0$$aSzepesi, T.$$b40
000904062 7001_ $$00000-0002-6835-1494$$aThomsen, H.$$b41
000904062 7001_ $$0P:(DE-Juel1)145890$$aWauters, T.$$b42
000904062 7001_ $$0P:(DE-HGF)0$$aWindisch, T.$$b43
000904062 7001_ $$0P:(DE-HGF)0$$aWinters, V.$$b44
000904062 7001_ $$0P:(DE-Juel1)145222$$aZhang, D.$$b45$$ufzj
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000904062 773__ $$0PERI:(DE-600)1472746-8$$a10.1063/5.0047274$$gVol. 28, no. 8, p. 082506 -$$n8$$p082506 -$$tPhysics of plasmas$$v28$$x1070-664X$$y2021
000904062 8564_ $$uhttps://juser.fz-juelich.de/record/904062/files/5.0047274.pdf$$yPublished on 2021-08-10. Available in OpenAccess from 2022-08-10.
000904062 8564_ $$uhttps://juser.fz-juelich.de/record/904062/files/Characterization%20of%20injection%20and%20confinement_postprint_Brezinsek.pdf$$yPublished on 2021-08-10. Available in OpenAccess from 2022-08-10.
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