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000891406 1001_ $$0P:(DE-Juel1)167407$$aLi, Yun$$b0$$ufzj
000891406 245__ $$aMeasurement of the edge ion temperature in W7-X with island divertor by a retarding field analyzer probe
000891406 260__ $$aVienna$$bIAEA$$c2019
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000891406 520__ $$aKnowledge of the edge ion temperature (Ti) is important to understand the edge physics in fusion plasmas. The Ti edge profile has been successfully measured at W7-X in an island divertor configuration using a retarding field analyzer probe on a reciprocating manipulator. The experimental observations show that in the standard configuration, an ion temperature shoulder at the plasma boundary has been observed near the location where a sudden change of the magnetic field connection length appears in the scrape-off layer (SOL) region. The value of the Ti shoulder was observed to be dependent on the edge island structure modified by the control coils, SOL kinetic power, and electron density. A significant reduction and flattening in the edge ion temperature profile has been also observed during the nitrogen seeding from the upper horizontal divertor port. In addition, the edge ion-to-electron temperature ratio has been calculated, which gradually increases with the major radius and decreases with the normalized ion collisionality. An extended two-point model including upstream ion temperature is introduced to understand the experimental measurement.
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000891406 7001_ $$0P:(DE-Juel1)168196$$aHenkel, Marion$$b1$$eCorresponding author
000891406 7001_ $$0P:(DE-Juel1)130088$$aLiang, Yunfeng$$b2$$ufzj
000891406 7001_ $$0P:(DE-Juel1)173792$$aKnieps, A.$$b3
000891406 7001_ $$0P:(DE-Juel1)162257$$aDrews, P.$$b4
000891406 7001_ $$00000-0001-7747-3066$$aKiller, C.$$b5
000891406 7001_ $$0P:(DE-Juel1)130112$$aNicolai, D.$$b6$$ufzj
000891406 7001_ $$0P:(DE-Juel1)167468$$aCosfeld, J.$$b7
000891406 7001_ $$0P:(DE-HGF)0$$aGeiger, J.$$b8
000891406 7001_ $$0P:(DE-Juel1)6982$$aFeng, Y.$$b9
000891406 7001_ $$0P:(DE-Juel1)137057$$aEffenberg, F.$$b10
000891406 7001_ $$0P:(DE-HGF)0$$aZhang, D.$$b11
000891406 7001_ $$0P:(DE-HGF)0$$aHacker, P.$$b12
000891406 7001_ $$0P:(DE-Juel1)166541$$aHöschen, D.$$b13$$ufzj
000891406 7001_ $$0P:(DE-Juel1)130135$$aSatheeswaran, G.$$b14
000891406 7001_ $$0P:(DE-HGF)0$$aLiu, S.$$b15
000891406 7001_ $$0P:(DE-HGF)0$$aGrulke, O.$$b16
000891406 7001_ $$0P:(DE-HGF)0$$aJakubowski, M.$$b17
000891406 7001_ $$0P:(DE-Juel1)129976$$aBrezinsek, S.$$b18
000891406 7001_ $$0P:(DE-HGF)0$$aOtte, M.$$b19
000891406 7001_ $$0P:(DE-Juel1)130109$$aNeubauer, O.$$b20
000891406 7001_ $$0P:(DE-Juel1)130154$$aSchweer, B.$$b21
000891406 7001_ $$0P:(DE-HGF)0$$aXu, G. S.$$b22
000891406 7001_ $$0P:(DE-Juel1)171371$$aCai, J.$$b23
000891406 7001_ $$0P:(DE-Juel1)176857$$aHuang, Z.$$b24
000891406 773__ $$0PERI:(DE-600)2037980-8$$a10.1088/1741-4326/ab3a79$$gVol. 59, no. 12, p. 126002 -$$n12$$p126002 -$$tNuclear fusion$$v59$$x1741-4326$$y2019
000891406 8564_ $$uhttps://juser.fz-juelich.de/record/891406/files/P5.1053.pdf$$yPublished on 2019-09-17. Available in OpenAccess from 2020-09-17.
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