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000859190 1001_ $$00000-0002-8886-1256$$aHenderson, S. S.$$b0$$eCorresponding author
000859190 245__ $$aAn assessment of nitrogen concentrations from spectroscopic measurements in the JET and ASDEX upgrade divertor
000859190 260__ $$aAmsterdam [u.a.]$$bElsevier$$c2019
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000859190 520__ $$aThe impurity concentration in the tokamak divertor plasma is a necessary input for predictive scaling of divertor detachment, however direct measurements from existing tokamaks in different divertor plasma conditions are limited. To address this, we have applied a recently developed spectroscopic N II line ratio technique for measuring the N concentration in the divertor to a range of H-mode and L-mode plasma from the ASDEX Upgrade and JET tokamaks, respectively. The results from both devices show that as the power crossing the separatrix, Psep, is increased under otherwise similar core conditions (e.g. density), a higher N concentration is required to achieve the same detachment state. For example, the N concentrations at the start of detachment increase from  ≈ 2% to  ≈ 9% as Psep is increased from  ≈ 2.5 MW to  ≈ 7 MW. These results tentatively agree with scaling law predictions (e.g. Goldston et al.) motivating a further study examining the parameters which affect the N concentration required to reach detachment. Finally, the N concentrations from spectroscopy and the ratio of D and N gas valve fluxes agree within experimental uncertainty only when the vessel surfaces are fully-loaded with N.
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000859190 7001_ $$0P:(DE-HGF)0$$aBernert, M.$$b1
000859190 7001_ $$0P:(DE-Juel1)129976$$aBrezinsek, S.$$b2
000859190 7001_ $$0P:(DE-HGF)0$$aCarr, M.$$b3
000859190 7001_ $$0P:(DE-HGF)0$$aCavedon, M.$$b4
000859190 7001_ $$0P:(DE-HGF)0$$aDux, R.$$b5
000859190 7001_ $$0P:(DE-HGF)0$$aGahle, D. S.$$b6
000859190 7001_ $$0P:(DE-HGF)0$$aHarrison, J.$$b7
000859190 7001_ $$0P:(DE-HGF)0$$aKallenbach, A.$$b8
000859190 7001_ $$0P:(DE-HGF)0$$aLipschultz, B.$$b9
000859190 7001_ $$0P:(DE-Juel1)174134$$aLomanowski, B.$$b10$$ufzj
000859190 7001_ $$0P:(DE-HGF)0$$aMeigs, A.$$b11
000859190 7001_ $$00000-0002-2160-4546$$aO’Mullane, M.$$b12
000859190 7001_ $$0P:(DE-Juel1)166412$$aReimold, F.$$b13
000859190 7001_ $$0P:(DE-HGF)0$$aReinke, M. L.$$b14
000859190 7001_ $$0P:(DE-Juel1)5247$$aWiesen, S.$$b15$$ufzj
000859190 773__ $$0PERI:(DE-600)2808888-8$$a10.1016/j.nme.2018.12.012$$gVol. 18, p. 147 - 152$$p147 - 152$$tNuclear materials and energy$$v18$$x2352-1791$$y2019
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