Demonstration of a two-dimensional divertor Thomson scattering system on DIII-D

Schroeder, Paul J.; Glass, Fenton; O’Gorman, Thomas; Carlstrom, Thomas N.; McLean, Adam G.; Watkins, Matthias; Taussig, Doug A.; Boivin, Rejean L.

doi:10.1063/5.0173911

Title: Demonstration of a two-dimensional divertor Thomson scattering system on DIII-D

Journal Article · 12 December 2023 · Review of Scientific Instruments

DOI: https://doi.org/10.1063/5.0173911 · OSTI ID:2327022

^[1];

^[2];

^[1];

^[3]; Watkins, Matthias ^[1]; Taussig, Doug A. ^[1]; Boivin, Rejean L. ^[1]

General Atomics, San Diego, CA (United States)
DT Fusion Consulting, Tipperary (Ireland)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Recent upgrades providing two-dimensional divertor Thomson scattering (DTS-2D) measurements of T_e and n_e during a DIII-D plasma shot and a thorough description of system components and their functionality are presented. This system expands the capabilities of the existing single divertor Floor measurement location by introducing seven additional laser beam path options in the poloidal plane, spanning major radii from 1.062 to 1.335 m. The system redirects ~1 J, 50 Hz Nd:YAG laser pulses to the new beam paths within 20 ms, stepping through each path on the divertor Floor every 200 ms during a plasma shot. The laser is redirected using an ex-vessel, fast-steering mirror to one of eight in-vessel beam paths oriented underneath the vessel tiles. Up to eleven measurement positions per beam path, from –1.35 to –1.13 m below the machine midplane, are available by dynamically refocusing the ex-vessel collection fiber array using a high-speed linear stage. As a result, current measurement positions above the divertor Shelf are retained via a hole in the fixed, in-vessel mirror, allowing laser pass through.

View Accepted Manuscript (DOE)

Cite

Export

Save

Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: FC02-04ER54698; AC52-07NA27344

OSTI ID:: 2327022

Journal Information:: Review of Scientific Instruments, Vol. 94, Issue 12; ISSN 0034-6748

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

Country of Publication:: United States

Language:: English

References (14)

MHD stability constraints on divertor heat flux width in DIII-D Leonard, A. W.; Jaervinen, A. E.; McLean, A. G. Nuclear Materials and Energy, Vol. 25 https://doi.org/10.1016/j.nme.2020.100869	journal	December 2020
Design of the divertor Thomson scattering system on DIII‐D Carlstrom, T. N.; Foote, J. H.; Nilson, D. G. Review of Scientific Instruments, Vol. 66, Issue 1 https://doi.org/10.1063/1.1146534	journal	January 1995
Initial operation of the divertor Thomson scattering diagnostic on DIII-D Carlstrom, T. N.; Hsieh, C. L.; Stockdale, R. Review of Scientific Instruments, Vol. 68, Issue 2 https://doi.org/10.1063/1.1147893	journal	February 1997
Thomson scattering diagnostic upgrade on DIII-D Ponce-Marquez, D. M.; Bray, B. D.; Deterly, T. M. Review of Scientific Instruments, Vol. 81, Issue 10 https://doi.org/10.1063/1.3495759	journal	October 2010
Initial results of the high resolution edge Thomson scattering upgrade at DIII-D Eldon, D.; Bray, B. D.; Deterly, T. M. Review of Scientific Instruments, Vol. 83, Issue 10 https://doi.org/10.1063/1.4738656	journal	October 2012
Electron pressure balance in the SOL through the transition to detachment McLean, A. G.; Leonard, A. W.; Makowski, M. A. Journal of Nuclear Materials, Vol. 463 https://doi.org/10.1016/j.jnucmat.2015.01.066	journal	August 2015
Design and operation of the multipulse Thomson scattering diagnostic on DIII‐D (invited) Carlstrom, T. N.; Campbell, G. L.; DeBoo, J. C. Review of Scientific Instruments, Vol. 63, Issue 10 https://doi.org/10.1063/1.1143545	journal	October 1992
A compact, low cost, seven channel polychromator for Thomson scattering measurements Carlstrom, T. N.; DeBoo, J. C.; Evanko, R. Review of Scientific Instruments, Vol. 61, Issue 10 https://doi.org/10.1063/1.1141806	journal	October 1990
Upgraded divertor Thomson scattering system on DIII-D Glass, F.; Carlstrom, T. N.; Du, D. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4955281	journal	July 2016
The two-dimensional structure of radiative divertor plasmas in the DIII-D tokamak Fenstermacher, M. E.; Allen, S. L.; Brooks, N. H. Physics of Plasmas, Vol. 4, Issue 5 https://doi.org/10.1063/1.872278	journal	May 1997
The high field side high density region in SOLPS-modeling of nitrogen-seeded H-modes in ASDEX Upgrade Reimold, F.; Wischmeier, M.; Potzel, S. Nuclear Materials and Energy, Vol. 12 https://doi.org/10.1016/j.nme.2017.01.010	journal	August 2017
Comparison of 2D simulations of detached divertor plasmas with divertor Thomson measurements in the DIII-D tokamak Rognlien, T. D.; McLean, A. G.; Fenstermacher, M. E. Nuclear Materials and Energy, Vol. 12 https://doi.org/10.1016/j.nme.2016.12.002	journal	August 2017
Suppression of large edge localized modes with edge resonant magnetic fields in high confinement DIII-D plasmas Evans, T. E.; Moyer, R. A.; Watkins, J. G. Nuclear Fusion, Vol. 45, Issue 7 https://doi.org/10.1088/0029-5515/45/7/007	journal	June 2005
UEDGE simulation of edge plasmas in DIII-D double null configurations Porter, G. D.; Petrie, T. W.; Rognlien, T. D. Physics of Plasmas, Vol. 17, Issue 11 https://doi.org/10.1063/1.3499666	journal	November 2010

Similar Records

Upgraded divertor Thomson scattering system on DIII-D

Journal Article · 2016 · Review of Scientific Instruments · OSTI ID:22596605

Carlstrom, T. N.; Du, D.; Taussig, D. A.; +2 more

Design of the divertor Thomson scattering system on DIII-D

Conference · 1994 · OSTI ID:10154612

Carlstrom, T N; Foote, J H; Nilson, D G; +1 more

Design of the divertor Thomson scattering system on DIII-D

Journal Article · 1995 · Review of Scientific Instruments; (United States) · OSTI ID:7060027

Carlstrom, T N; Foote, J H; Nilson, D G; +1 more

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Title: Demonstration of a two-dimensional divertor Thomson scattering system on DIII-D

Citation Formats

References (14)

Similar Records

Related Subjects