Active spectroscopy measurements of the deuterium temperature, rotation, and density from the core to scrape off layer on the DIII-D tokamak (invited)

Haskey, S. R.; Grierson, B. A.; Stagner, L.; Chrystal, C.; Ashourvan, A.; Bortolon, A.; Boyer, M. D.; Burrell, K. H.; Collins, C.; Groebner, R. J.; Kaplan, D. H.; Pablant, N. A.

doi:10.1063/1.5038349

Title: Active spectroscopy measurements of the deuterium temperature, rotation, and density from the core to scrape off layer on the DIII-D tokamak (invited)

Journal Article · Thu Aug 16 00:00:00 EDT 2018 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.5038349· OSTI ID:1484226

^[1]; Grierson, B. A. ^[1];

^[2];

^[3]; Ashourvan, A. ^[1];

^[1]; Boyer, M. D. ^[1];

^[3]; Collins, C. ^[3]; Groebner, R. J. ^[3]; Kaplan, D. H. ^[3];

^[1]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of California, Irvine, CA (United States)
General Atomics, San Diego, CA (United States)

Main-ion charge exchange recombination spectroscopy (MICER) uses the neutral beam induced D_α spectrum to measure the local deuterium ion (D⁺) temperature, rotation, and density, as well as parameters related to the neutral beams, fast ions, and magnetic field. An edge MICER system consisting of 16 densely packed chords was recently installed on DIII-D, extending the MICER technique from the core to the pedestal and steep gradient region of H-mode plasmas where the D⁺ and commonly measured impurity ion properties can differ significantly. A combination of iterative collisional radiative modeling techniques and greatly accelerated spectral fitting allowed the extension of this diagnostic technique to the plasma edge where the steep gradients introduce significant diagnostic challenges. The importance of including the fast ion Dα emission in the fit to the spectrum for the edge system is investigated showing that it is typically not important except for cases which can have significant fast ion fractions near the plasma edge such as QH-mode. Example profiles from an Ohmic L-mode and a high power ITER baseline case show large differences in the toroidal rotation of the two species near the separatrix including a strong co-current D⁺ edge rotation. As a result, the measurements and analysis demonstrate the state of the art in active spectroscopy and integrated modeling for diagnosing fusion plasmas and the importance of direct main ion measurements.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466; FC02-04ER54698; FC02-95ER54309

OSTI ID:: 1484226

Alternate ID(s):: OSTI ID: 1464861

Journal Information:: Review of Scientific Instruments, Vol. 89, Issue 10; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 30 works

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Main-ion intrinsic toroidal rotation across the ITG/TEM boundary in DIII-D discharges during ohmic and electron cyclotron heating Grierson, B. A.; Chrystal, C.; Haskey, S. R. Physics of Plasmas, Vol. 26, Issue 4 https://doi.org/10.1063/1.5090505	journal	April 2019
Measurements of radial profile of hydrogen and deuterium density in isotope mixture plasmas using bulk charge exchange spectroscopy Ida, K.; Yoshinuma, M.; Yamasaki, K. Review of Scientific Instruments, Vol. 90, Issue 9 https://doi.org/10.1063/1.5097030	journal	September 2019
Main ion and impurity edge profile evolution across the L- to H-mode transition on DIII-D Haskey, S. R.; Grierson, B. A.; Chrystal, C. Plasma Physics and Controlled Fusion, Vol. 60, Issue 10 https://doi.org/10.1088/1361-6587/aad702	journal	August 2018
The isotope effect on impurities and bulk ion particle transport in the Large Helical Device Ida, K.; Sakamoto, R.; Yoshinuma, M. Nuclear Fusion, Vol. 59, Issue 5 https://doi.org/10.1088/1741-4326/ab0e41	journal	April 2019
Feedback control of stored energy and rotation with variable beam energy and perveance on DIII-D Boyer, M. D.; Erickson, K. G.; Grierson, B. A. Nuclear Fusion, Vol. 59, Issue 7 https://doi.org/10.1088/1741-4326/ab17f5	journal	May 2019
Direct gyrokinetic comparison of pedestal transport in JET with carbon and ITER-like walls Hatch, D. R.; Kotschenreuther, M.; Mahajan, S. M. Nuclear Fusion, Vol. 59, Issue 8 https://doi.org/10.1088/1741-4326/ab25bd	journal	July 2019
Predicting the rotation profile in ITER Chrystal, C.; Grierson, B. A.; Haskey, S. R. Nuclear Fusion, Vol. 60, Issue 3 https://doi.org/10.1088/1741-4326/ab6434	journal	January 2020
Transition between Isotope-Mixing and Nonmixing States in Hydrogen-Deuterium Mixture Plasmas Ida, K.; Nakata, M.; Tanaka, K. Physical Review Letters, Vol. 124, Issue 2 https://doi.org/10.1103/physrevlett.124.025002	journal	January 2020
Direct Gyrokinetic Comparison of Pedestal Transport in JET with Carbon and ITER-Like Walls Hatch, D. R.; Kotschenreuther, M.; Mahajan, S. M. arXiv https://doi.org/10.48550/arxiv.1903.02627	text	January 2019

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