High resolution main-ion charge exchange spectroscopy in the DIII-D H-mode pedestal
- Princeton Univ., Princeton, NJ (United States)
- General Atomics, San Diego, CA (United States)
- Oak Ridge Associated Universities, Oak Ridge, TN (United States)
A new high spatial resolution main-ion (deuterium) charge-exchange spectroscopy system covering the toka- mak boundary region has been installed on the DIII-D tokamak. Sixteen new edge main-ion CER sightlines have been combined with nineteen impurity sightlines in a tangentially viewing geometry on the DIII-D mid- plane with an interleaving design that achieves 8 mm inter-channel radial resolution for detailed profiles of main-ion temperature, velocity, charge-exchange emission and neutral beam emission. At the plasma bound- ary, we find a strong enhancement of the main-ion toroidal velocity that exceeds the impurity velocity by a factor of two. The unique combination of experimentally measured main-ion and impurity profiles provide a powerful quasi-neutrality constraint for reconstruction of tokamak H-mode pedestals.
- Research Organization:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States)
- Sponsoring Organization:
- USDOE
- Contributing Organization:
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA; Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831, USA; B.A. Grierson, K.H. Burrell, C. Chrystal, R.J. Groebner, S.R. Haskey, D.H. Kaplan, "High resolution main-ion charge exchange spectroscopy in the DIII-D H-mode pedestal", Rev. Sci. Instrum. 87, 11E545 (2016)
- Grant/Contract Number:
- AC02-09CH11466; FC02-04ER54698
- OSTI ID:
- 1340075
- Alternate ID(s):
- OSTI ID: 1371902
- Report Number(s):
- 5275; RSINAK; TRN: US1701646
- Journal Information:
- Review of Scientific Instruments, Vol. 87, Issue 11; Conference: 21st Topical Conference on High-Temperature Plasma Diagnostics , Madison, WI (United States), 5-9 Jun 2016; Related Information: DIII-D data shown in this paper can be obtained in digital format by following the links at https://fusion.gat.com/global/D3D-DMP; ISSN 0034-6748
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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