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Title: Impurity ion flow and temperature measured in a detached divertor with externally applied non-axisymmetric fields on $$\mathrm{DIII}$$-$$\mathrm{D}$$

Journal Article · · Journal of Nuclear Materials
 [1];  [1];  [2];  [1];  [2];  [1];  [1];  [2];  [2]
  1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  2. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
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In this study, externally applied non-axisymmetric magnetic fields are shown to have little effect on the impurity ion flow velocity and temperature as measured by the multichord divertor spectrometer in the DIII-D divertor for both attached and detached conditions. These experiments were performed in H-mode plasmas with the grad-B drift toward the target plates, with and without n = 3 resonant magnetic perturbations (RMPs). The flow velocity in the divertor is shown to change by as much as 30% when deuterium gas puffing is used to create detachment of the divertor plasma. No measurable changes in the C III flow were observed in response to the RMP fields for the conditions used in this work. Images of the C III emission are used along with divertor Thomson scattering to show that the local electron and C III temperatures are equilibrated for the conditions shown.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
AC05-00OR22725; FC02-04ER54698; AC52-07NA27344; AC02-00OR22725
OSTI ID:
1286755
Alternate ID(s):
OSTI ID: 1252303; OSTI ID: 1289383
Report Number(s):
LLNL-JRNL-698169; AT1010101; ERAT355
Journal Information:
Journal of Nuclear Materials, Vol. 463, Issue C; ISSN 0022-3115
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 1 work
Citation information provided by
Web of Science

References (10)

Spectroscopic characterization of the DIII-D divertor journal February 1997
Characterization of divertor footprints and the pedestal plasmas in the presence of applied n = 3 fields for the attached and detached conditions in NSTX journal December 2013
Results from radiating divertor experiments with RMP ELM suppression and mitigation journal May 2011
Footprint structures due to resonant magnetic perturbations in DIII-D journal April 2009
Comparison between stellarator and tokamak divertor transport journal January 2011
Initial operation of the divertor Thomson scattering diagnostic on DIII-D journal February 1997
Multichord spectroscopy of the DIII‐D divertor region journal October 1992
Spectroscopic analysis of normal and reversed ion flows in the DIII-D divertor journal February 1999
A tangentially viewing visible TV system for the DIII-D divertor journal January 1997
Spectroscopic measurements of impurity temperatures and parallel ion flows in the DIII-D divertor journal March 1999

Figures / Tables (9)

Fig. 1(p. 13)figure Fig. 1
Fig. 2(p. 14)figure Fig. 2
Fig. 3(p. 15)figure Fig. 3
Fig. 4(p. 16)figure Fig. 4
Fig. 5(p. 17)figure Fig. 5
Fig. 6(p. 18)figure Fig. 6
Fig. 7(p. 19)figure Fig. 7
Fig. 8(p. 20)figure Fig. 8
Fig. 9(p. 21)figure Fig. 9

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DIII-D
RMP
divertor
70 PLASMA PHYSICS AND FUSION
plasma flow
spectroscopy
detachment
divertor plasma
divertor diagnostic
carbon-based materials