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Expanding the role of impurity spectroscopy for investigating the physics of high-Z dissipative divertors

Reinke, M. L. (author)
Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.;Univ York, Heslington YO10 5DD, York, England.
Bergsåker, Henric (author)
KTH,Fusionsplasmafysik
Bykov, Igor (author)
KTH,Fusionsplasmafysik
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Elevant, Thomas (author)
KTH,Fusionsplasmafysik
Frassinetti, Lorenzo (author)
KTH,Fusionsplasmafysik
Garcia Carrasco, Alvaro, 1989- (author)
KTH,Fusionsplasmafysik
Hellsten, Torbjörn (author)
KTH,Fusionsplasmafysik
Ivanova, Darya (author)
KTH,Fusionsplasmafysik
Johnson, Thomas Joe (author)
KTH,Fusionsplasmafysik
Menmuir, Sheena (author)
KTH,Fusionsplasmafysik
Petersson, Per (author)
KTH,Fusionsplasmafysik
Rachlew, Elisabeth, 1944- (author)
KTH,Atom- och molekylfysik
Reinke, M. (author)
Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
Rubel, Marek (author)
KTH,Fusionsplasmafysik
Ström, Petter (author)
KTH,Fusionsplasmafysik
Tholerus, Simon, 1986- (author)
KTH,Fusionsplasmafysik
Weckmann, Armin (author)
KTH,Fusionsplasmafysik
Zychor, I. (author)
Inst Plasma Phys & Laser Microfus, PL-01497 Warsaw, Poland.
Andersson Sundén, Erik (author)
Uppsala universitet,Tillämpad kärnfysik
Asp, E. (author)
Uppsala universitet,Institutionen för fysik och astronomi
Binda, Federico, 1987- (author)
Uppsala universitet,Tillämpad kärnfysik
Cecconello, Marco (author)
Uppsala universitet,Tillämpad kärnfysik
Conroy, Sean (author)
Uppsala universitet,Tillämpad kärnfysik
Dzysiuk, Nataliia (author)
Uppsala universitet,Tillämpad kärnfysik
Ericsson, Göran (author)
Uppsala universitet,Tillämpad kärnfysik
Eriksson, Jacob, Dr, 1985- (author)
Uppsala universitet,Tillämpad kärnfysik
Hellesen, Carl, 1980- (author)
Uppsala universitet,Tillämpad kärnfysik
Hjalmarsson, Anders (author)
Uppsala universitet,Tillämpad kärnfysik
Possnert, Göran, 1951- (author)
Uppsala universitet,Tillämpad kärnfysik
Sjöstrand, Henrik, 1978- (author)
Uppsala universitet,Tillämpad kärnfysik
Skiba, Mateusz, 1985- (author)
Uppsala universitet,Tillämpad kärnfysik
Weiszflog, Matthias (author)
Uppsala universitet,Tillämpad kärnfysik
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Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA;Univ York, Heslington YO10 5DD, York, England. Fusionsplasmafysik (creator_code:org_t)
Elsevier, 2017
2017
English.
In: Nuclear Materials and Energy. - : Elsevier. - 2352-1791. ; 12, s. 91-99
Related links:
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https://doi.org/10.1...
https://uu.diva-port... (primary) (Raw object)
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • New techniques that attempt to more fully exploit spectroscopic diagnostics in the divertor and pedestal region during highly dissipative scenarios are demonstrated using experimental results from recent low-Z seeding experiments on Alcator C-Mod, JET and ASDEX Upgrade. To exhaust power at high parallel heat flux, q(vertical bar vertical bar) > 1 GW/m(2), while minimizing erosion, reactors with solid, high-Z plasma facing components (PFCs) are expected to use extrinsic impurity seeding. Due to transport and atomic physics processes which impact impurity ionization balance, so-called 'non-coronal' effects, we do not accurately know and have yet to demonstrate the maximum q(vertical bar vertical bar) which can be mitigated in a tokamak. Radiation enhancement for nitrogen is shown to arise primarily from changes in Li- and Be-like charge states on open field lines, but also through transport-driven enhancement of H-and He-like charge states in the pedestal region. Measurements are presented from nitrogen seeded H-mode and L-mode plasmas where emission from N1+ through N6+ are observed. Active charge exchange spectroscopy of partially ionized low-Z impurities in the plasma edge is explored to measure N5+ and N6+ within the confined plasma, while passive UV and visible spectroscopy is used to measure N1+ - N4+ in the boundary. Examples from recent JET and Alcator C-Mod experiments which employ nitrogen seeding highlight how improving spectroscopic coverage can be used to gain empirical insight and provide more data to validate boundary simulations.

Subject headings

NATURVETENSKAP  -- Fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences (hsv//eng)
NATURVETENSKAP  -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)

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