Publications

Optimizing the HSX stellarator for microinstability by coil-current adjustments,
M.J. Gerard, B. Geiger, M.J. Pueschel, A. Bader, C.C. Hegna, B.J. Faber, P.W. Terry, S.T.A. Kumar and J.C. Schmitt
Nuclear Fusion 63, 056004 (2023)
https://doi.org/10.1088/1741-4326/acc1f6
Design study of an edge current density diagnostic using new high-performance single-channel beam emission spectrometers at DIII-D,
R. Albosta, B. Geiger, G. McKee, D. Den Hartog, J. Schellpfeffer, T. Gallenberger, S. Stewart, and R. Dux
Review of Scientific Instruments 93, 113546 (2022)
https://doi.org/10.1063/5.0101781
Pedestal fluctuation measurements with charge exchange imaging at the DIII-D tokamak,
M. R. Major, G. R. McKee, B. Geiger, D. J. Den Hartog, K. Jaehnig, C. Seyfert, D. R. Smith, S. D. Stewart, and Z. Yan
Review of Scientific Instruments 93, 113503 (2022)
https://doi.org/10.1063/5.0101844
Integrated 2D beam emission spectroscopy diagnostic at the Huan-Liuqi-2A (HL-2A) tokamak,
X. Qin, G. McKee, Z. Yan, B. Geiger, R. Ke, K. Jaehnig, L. Morton, Y. Wu, T. Wu, and M. Xu
Review of Scientific Instruments 93, 103535 (2022)
https://doi.org/10.1063/5.0101806
Design of a new charge exchange recombination spectroscopy diagnostic for impurity transport experiments at Wendelstein 7-X,
Colin Swee, Benedikt Geiger, Ryan Albosta, Oliver Ford, Stuart Loch, M. D. Nornberg, Jacob Schellpheffer, Thomas Wegner, and W7-X Team2
Review of Scientific Instruments 93, 103523 (2022)
https://doi.org/10.1063/5.0101842
Conceptual design and performance predictions for 2D beam emission spectroscopy turbulence measurements at Wendelstein 7-X,
D. R. Smith, G. McKee, D. Den Hartog, B. Geiger, O. Grulke, X. Han, K. Jaehnig, C. Seyfert, and T. Windisch
Review of Scientific Instruments 93, 073506 (2022)
https://doi.org/10.1063/5.0101355
Impurity transport studies at the HSX stellarator using active and passive CVI spectroscopy,
C. Swee, B. Geiger, R. Dux, S. T. A. Kumar, J. F. Castillo, A. Bader, and M. Gerard
Plasma Physics and Controlled Fusion 64, 015008 (2021)
https://doi.org/10.1088/1361-6587/ac3965
Scoping study of detecting high harmonic fast waves in NSTX-U hot core plasma directly using beam emission spectroscopy,
G. Rutherford, S. Shiraiwa, D. R. Smith, and N. Bertelli
Review of Scientific Instruments 92, 053521 (2021)
https://doi.org/10.1063/5.0040399
Ion temperature and rotation fluctuation measurements with ultra-fast charge exchange recombination spectroscopy (UF-CHERS) in the DIII-D tokamak,
D. D. Truong, G. R. McKee, Z. Yan, K. Jaehnig, G. R. Winz, R. J. Fonck, and B. Geiger
Review of Scientific Instruments 92, 053513 (2021)
https://doi.org/10.1063/5.0043095
Effect of magnetic perturbations on turbulence-flow dynamics at the L-H transition on DIII-D,
D. M. Kriete, G. R. McKee, L. Schmitz, D. R. Smith, Z. Yan, L. A. Mortaon, and R. J. Fonck
Physics of Plasmas 27, 062507 (2020)
https://doi.org/10.1063/1.5145207
Safety factor and turbulence dynamics dependence of the L-H power threshold on DIII-D,
Z. Yan, G. R. McKee, P. Gohil, L. Schmitz, C. Holland, S. R. Haskey, B. A. Grierson, R. Ke, T. Rhodes, and C. Petty,
Physics of Plasmas 26, 062507 (2019)
https://doi.org/10.1063/1.5091701
Spatial heterodyne spectroscopy for high speed measurements of Stark split neutral beam emission in a high temperature plasma,
M. G. Burke, R. J. Fonck, G. R. McKee, and G. R. Winz
Review of Scientific Instruments 89, 10D114 (2018)
https://doi.org/10.1063/1.5039285
Extracting the turbulent flow-field from beam emission spectroscopy images using velocimetry,
D. M. Kriete, G. R. McKee, R. J. Fonck, D. R. Smith, G. G. Whelan, and Z. Yan
Review of Scientific Instruments 89, 10E107 (2018)
https://doi.org/10.1063/1.5036535
Turbulence and sheared flow structures behind the isotopic dependence of the L-H power threshold on DIII-D,
Z. Yan, P. Gohil, G.R. McKee, D. Eldon, B. Grierson, T. Rhodes and C.C. Petty
Nuclear Fusion 57, 126015 (2017)
https://doi.org/10.1088/1741-4326/aa82c9
Turbulence evolution and transport behavior during current ramp-up in ITER-like plasmas on DIII-D,
G.R. McKee, M. Austin, J. Boedo, R. Bravenec, C. Holland, G. Jackson, T.C. Luce, T.L. Rhodes, D. Rudakov, G. Wang
Nuclear Fusion 57, 086032 (2017)
https://doi.org/10.1088/1741-4326/aa78b8
Evolution patterns and parameter regimes in edge localized modes on the National Spherical Torus Experiment,
D. R. Smith, R. J. Fonck, G. R. McKee, A. Diallo, S. M. Kaye, B. P. LeBlanc, and S. A. Sabbagh
Plasma Phys. Control. Fusion 58, 045003 (2016)
https://doi.org/10.1088/0741-3335/58/4/045003
Observation of the L?H Confinement Bifurcation Triggered by a Turbulence-Driven Shear Flow in a Tokamak Plasma,
Z. Yan, G.R. McKee, R. Fonck, P. Gohil, R.J. Groebner, and T.H. Osborne
Physical Review Letters 112, 125002 (2014)
https://doi.org/10.1103/PhysRevLett.112.125002
Increase of turbulence and transport with resonant magnetic perturbations in ELM-suppressed plasmas on DIII-D,
G.R. McKee, Z. Yan, C. Holland, R.J. Buttery, T.E. Evans, R.A. Moyer, S. Mordijck, R. Nazikian, T.L. Rhodes, and O. Schmitz
Nuclear Fusion 53, 113011 (2013)
https://doi.org/10.1088/0029-5515/53/11/113011
Measurements and simulations of low wavenumber pedestal turbulence in the National Spherical Torus Experiment,
D. R. Smith, S. E. Parker, W. Wan, Y. Chen, A. Diallo, B. D. Dudson, R. J. Fonck, W. Guttenfelder, G. R. McKee, S. M. Kaye, D. S. Thompson, R. E. Bell, B. P. LeBlanc, and M. Podesta
Nuclear Fusion 53, 113029 (2013)
https://doi.org/10.1088/0029-5515/53/11/113029
Relating the L–H power threshold scaling to edge turbulence dynamics
Z. Yan, G.R. McKee, J.A. Boedo, D.L. Rudakov, L. Schmitz, P.H. Diamond, G. Tynan, R.J. Fonck, R.J. Groebner, T.H. Osborne, and P. Gohil
Nuclear Fusion 53, 113038 (2013)
https://doi.org/10.1088/0029-5515/53/11/113038
Characterization and parametric dependencies of low wavenumber pedestal turbulence in the National Spherical Torus Experiment,
D. R. Smith, R. J. Fonck, G. R. McKee, D. S. Thompson, R. E. Bell, A. Diallo, W. Guttenfelder, S. M. Kaye, B. P. LeBlanc, and M. Podesta
Physics of Plasmas 20, 055903 (2013)
https://doi.org/10.1063/1.4803913
Ultra-fast charge exchange spectroscopy for turbulent ion temperature fluctuation measurements on the DIII-D tokamak (invited),
I. U. Uzun-Kaymak, R. J. Fonck, and G. R. McKee,
Review of Scientific Instruments 83, 10D526 (2012),
https://doi.org/10.1063/1.4733548
Diagnostic performance of the beam emission spectroscopy system on the National Spherical Torus Experiment,
D. R. Smith, R. J. Fonck, G. R. McKee, and D. S. Thompson,
Review of Scientific Instruments 83, 10D502 (2012)
https://doi.org/10.1063/1.4728094
2D properties of core turbulence on DIII-D and comparison to gyrokinetic simulations,
M. W. Shafer, R. J. Fonck, G. R. McKee, C. Holland, A. E. White, and D. J. Schlossberg,
Physics of Plasmas 19, 032504 (2012)
https://doi.org/10.1063/1.3691965
Pedestal density fluctuation dynamics during the inter-ELM cycle in DIII-D,
Z. Yan, G. R. McKee, R. J. Groebner, P. B. Snyder, T. H. Osborne, M. N. Beurskens, and K. H. Burrell,
Physics of Plasmas 18, 056117 (2011)
https://doi.org/10.1063/1.3590936
High-Frequency Coherent Edge Fluctuations in a High-Pedestal-Pressure Quiescent H-Mode Plasma,
Z. Yan, G. R. McKee, R. J. Groebner, P. B. Snyder, T. H. Osborne, and K. H. Burrell,
Physical Review Letters 107, 055004 (2011)
https://doi.org/10.1103/PhysRevLett.107.055004
Ultrafast spectroscopy diagnostic to measure localized ion temperature and toroidal velocity fluctuations,
I. U. Uzun-Kaymakc), R. J. Fonck, G. R. McKee, N. Schoenbeck, D. Smith, G. Winz, and Z. Yan,
Review of Scientific Instruments 81, 10D714 (2010)
https://doi.org/10.1063/1.3479114
Overview of the beam emission spectroscopy diagnostic system on the National Spherical Torus Experiment,
D. R. Smith, H. Feder, R. Feder, R. J. Fonck, G. Labik, G. R. McKee, N. Schoenbeck, B. C. Stratton, I. Uzun-Kaymak, and G. Winz,
Review of Scientific Instruments 81, 10D717 (2010)
https://doi.org/10.1063/1.3478660
Wide-field turbulence imaging with beam emission spectroscopy,
G. R. McKee, R. J. Fonck, M. W. Shafer, I. U. Uzun-Kaymak, and Z. Yan,
Review of Scientific Instruments 81, 10D741 (2010)
https://doi.org/10.1063/1.3495788
Dynamic programming based time-delay estimation technique for analysis of time-varying time-delay,
Deepak K. Gupta, George R. McKee, and Raymond J. Fonck,
Review of Scientific Instruments 81, 013501 (2010)
https://doi.org/10.1063/1.3280161
Localized Turbulence Suppression and Increased Flow Shear near the q=2 Surface during Internal-Transport-Barrier Formation,
M. W. Shafer, G. R. McKee, M. E. Austin, K. H. Burrell, R. J. Fonck, and D. J. Schlossberg,
Physical Review Letters 103, 075004 (2009)
https://doi.org/10.1103/PhysRevLett.103.075004
Dependence of the L- to H-mode power threshold on toroidal rotation and the link to edge turbulence dynamics,
G.R. McKee, P. Gohil, D.J. Schlossberg, J.A. Boedo, K.H. Burrell, J.S. deGrassie, R.J. Groebner, R.A. Moyer, C.C. Petty, T.L. Rhodes,
Nuclear Fusion 49, 115016 (2009)
http://dx.doi.org/10.1088/0029-5515/49/11/115016
Dependence of the low to high confinement mode transition power threshold and turbulence flow shear on injected torque,
D. J. Schlossberg, G. R. McKee, R. J. Fonck, K. H. Burrell, P. Gohil, R. J. Groebner, M. W. Shafer, W. M. Solomon, and G. Wang,
Physics of Plasmas 16, 080701 (2009)
https://doi.org/10.1063/1.3192766
Ultrafast ion temperature and toroidal velocity fluctuation spectroscopy diagnostic design,
G. R. McKee, D. J. Schlossberg, and M. W. Shafer,
Review of Scientific Instruments 79, 10F528 (2008)
https://doi.org/10.1063/1.2974808
Zonal-flow-driven nonlinear energy transfer in experiment and simulation,
C. Holland, G. R. Tynan, R. J. Fonck, G. R. McKee, J. Candy, and R. E. Waltz,
Physics of Plasmas 14, 056112 (2007)
https://doi.org/10.1063/1.2716409
Detection of Zero-Mean-Frequency Zonal Flows in the Core of a High-Temperature Tokamak Plasma,
D. K. Gupta, R. J. Fonck, G. R. McKee, D. J. Schlossberg, and M. W. Shafer,
Physical Review Letters 97, 125002 (2006)
https://doi.org/10.1103/PhysRevLett.97.125002
High sensitivity beam emission spectroscopy for core plasma turbulence imaging (invited),
G. R. McKee, R. J. Fonck, D. K. Gupta, D. J. Schlossberg, M. W. Shafer, and R. L. Boivin,
Review of Scientific Instruments 77, 10F104 (2006)
https://doi.org/10.1063/1.2219429
Structure and scaling properties of the geodesic acoustic mode,
G R McKee, D K Gupta, R J Fonck, D J Schlossberg, M W Shafer and P Gohil,
Plasma Phys. Control. Fusion 48 S123 (2006)
https://doi.org/10.1088/0741-3335/48/4/S09
Velocity fluctuation analysis via dynamic programming,
D. J. Schlossberg, D. K. Gupta, R. J. Fonck, G. R. McKee, and M. W. Shafer,
Review of Scientific Instruments 77, 10F518 (2006)
https://doi.org/10.1063/1.2235169
Spatial transfer function for the beam emission spectroscopy diagnostic on DIII-D,
M. W. Shafer, R. J. Fonck, G. R. McKee, and D. J. Schlossberg,
Review of Scientific Instruments 77, 10F110 (2006)
https://doi.org/10.1063/1.2221908