Papers by Greg Hammett and collaborators on gyrofluid and gyrokinetic simulations of tokamak plasma turbulence and the development of theory-based transport models (plus other topics in recent years...)

This page is mostly for my theory-focussed papers since about 1990.

A more complete publication list is in the Harvard/Smithsonian/NASA abstract service, and the most complete is at ORCID.

The Gkeyll code web pages have a more complete list of papers and presentations from the full group.

For white papers prepared for review committees, along with talks and poster slides, see the presentations web page.

2021

Magnetic Fluctuations in Gyrokinetic Simulations of Tokamak Scrape-Off Layer Turbulence , Noah R. Mandell, Princeton University Ph.D. dissertation (2021).

2020

Conservative discontinuous Galerkin scheme of a gyro-averaged Dougherty collision operator M. Francisquez, T.N. Bernard, N.R. Mandell, G.W. Hammett, and A. Hakim, Nuclear Fusion 60, 096021.

“Fluid and gyrokinetic turbulence in open field-line, helical plasmas”, M. Francisquez, T. N. Bernard, B. Zhu, A. Hakim, B. N. Rogers, and G. W. Hammett , Physics of Plasmas 27, 082301 (2020)

Conservative discontinuous Galerkin schemes for nonlinear Dougherty-Fokker-Planck collision operators, Ammar Hakim, Manaure Francisquez, James Juno, and Gregory W. Hammett (2020) J. of Plasma Phys., 86, 905860403. (arxiv)

“Continuum electromagnetic gyrokinetic simulations of turbulence in the tokamak scrape-off layer and laboratory devices”, Ammar H. Hakim, Noah R. Mandell, T. N. Bernard, M. Francisquez, G. W. Hammett, and E. L. Shi, Phy. Plasmas 27, 042304 (2020) (APS-DPP invited talk paper.)

"Electromagnetic full-f gyrokinetics in the tokamak edge with discontinuous Galerkin methods", N. R. Mandell, A. Hakim, G. W. Hammett, M. Francisquez, J. Plasma Phys. 86, 905860109 (2020), featured article, open access. (local pdf) (arxiv)

"Investigating shear flow through continuum gyrokinetic simulations of limiter biasing in the Texas Helimak", T.N. Bernard, T. Stoltzfus-Dueck, K.W. Gentle, A. Hakim, G.W. Hammett, and E.L. Shi., Phy. Plasmas 27 (2020), 062304.

2019

"Discontinuous Galerkin schemes for a class of Hamiltonian evolution equations with applications to plasma fluid and kinetic problems", A. Hakim, G. W. Hammett, E. L. Shi, N. R. Mandell (arxiv) 2019.

"Gyrokinetic continuum simulations of plasma turbulence in the Texas Helimak", Bernard, T. N.; Shi, E. L.; Gentle, K. W.; Hakim, A.; Hammett, G. W.; Stoltzfus-Dueck, T.; Taylor, E. I., Physics of Plasmas, 26, 042301 (arxiv)

"Full-f gyrokinetic simulation of turbulence in a helical open-field-line plasma", Shi, E. L.; Hammett, G. W.; Stoltzfus-Dueck, T.; Hakim, A., Physics of Plasmas 26, 012307 (2019) (arxiv)

2018

"Continuum Gyrokinetic Simulations of NSTX SOL Turbulence with Sheath-Limited Model Geometries", A. Hakim, E.L. Shi, T. Bernard, M. Francisquez, G.W. Hammett, F. Jenko, N.R. Mandell, Q. Pan, T. Stoltzfus-Dueck, D. Told, 27th IAEA Fusion Energy Conference (2018, India). (local copy)

"Full-f version of GENE for turbulence in open-field-line systems", Pan, Q.; Told, D.; Shi, E. L.; Hammett, G. W.; Jenko, F., Phys. Plasmas 25, 062303 (2018).

2017

"Gyrokinetic Continuum Simulation of Turbulence in Open-Field-Line Plasmas", Eric L. Shi, Ph.D. Dissertation, Princeton University, 2017. (arxiv)

"Gyrokinetic continuum simulation of turbulence in a straight open-field-line plasma", E. L. Shi, G. W. Hammett, T. Stoltzfus-Dueck, A. Hakim, J. Plasma Phys. 83 (2017) 905830304. Editors selected as a "Featured Article" and free to download. (arxiv)

"Recent Advances Towards a Lithium Vapor Box Divertor", R.J. Goldston, A. Hakim, G.W. Hammett, M.A. Jaworski, J. Schwartz, Nucl. Materials and Energy, 12, 1118 (2017) (open access)

2016

"Scrape-Off Layer Turbulence in Tokamaks Simulated with a Continuum Gyrokinetic Code", A. Hakim, E.L. Shi, I.G. Abel, G.W. Hammett, T. Stoltzfus-Dueck, Proc. of the 26th IAEA Fusion Energy Conference (2016, Kyoto, Japan). (arxiv 2016.)

"Phase mixing versus nonlinear advection in drift-kinetic plasma turbulence", A. A. Schekochihin, J. T. Parker, E. G. Highcock, P. J. Dellar, W. Dorland, G. W. Hammett, J. Plasma Phys. 82, 905820212 (2016). (arxiv 2015, arvix version used abbreviated title "Phase mixing vs. nonlinear advection in drift-kinetic plasma turbulence".)

2015

"Multiscale Nature of the Dissipation Range in Gyrokinetic Simulations of Alfvenic Turbulence", D. Told, F. Jenko, J. M. TenBarge, G. G. Howes, and G. W. Hammett Phys. Rev. Lett. 115, 025003 (2015). (local copy)

"A Gyrokinetic 1D Scrape-Off Layer Model of an ELM Heat Pulse", E.L. Shi, A. H. Hakim, G. W. Hammett, Phys. Plasmas 22, 022504 (2015). (local copy) arxiv

2014

"Intrinsic momentum transport in up-down asymmetric tokamaks", Justin Ball, Felix I. Parra, Michael Barnes, William Dorland, Gregory W. Hammett, Paulo Rodrigues, Nuno F. Loureiro, Plasma Phys. Control. Fusion 56 (2014), 095014. Featured in a PPCF LabTalk Highlight. ( arxiv)

"On discontinuous Galerkin discretizations of second-order derivatives", A. H. Hakim, G. W. Hammett, E. L. Shi, subm. to J. Comp. Phys. (2014).

"The actual scaling of a nominally third-order Reynolds stress", J. A. Krommes and G. W. Hammett, Phys. Plasmas 21 (2014), 054502.

"Applications of large eddy simulation methods to gyrokinetic turbulence", A. Bañón Navarro, B. Teaca, F. Jenko, G. W. Hammett, T. Happel and ASDEX Upgrade Team, Phys. Plasmas 21, 032304 (2014). (Copyright), arxiv version.

"An Oscillating Langevin Antenna for Driving Plasma Turbulence Simulations", J.M. TenBarge, G.G. Howes, W. Dorland, G.W. Hammett, Comp. Phys. Comm. 185, 578 (2014). doi, arxiv.

2013

"Report of the Study Group GK2 on Momentum Transport in Gyrokinetics", J. A. Krommes and G. W. Hammett, Technical Report PPPL-4945, October, 2013. (local copy)

"The Low-Recyling Lithium Boundary and Implications for Plasma Transport", Erik Michael Granstedt, Ph.D. Dissertation, Princeton University, 2013.

"Positivity Preservation and Advection Algorithms With Applications To Edge Plasma Turbulence", J. L. Peterson and G. W. Hammett, SIAM J. Sci. Computing 35, B576 (2013). (Submitted Aug. 8, 2012, final version Feb. 25, 2013) (with errata, 4/8/2017)

"Comparing linear ion-temperature-gradient-driven mode stability of the National Compact Stellarator Experiment and a shaped tokamak", J. A. Baumgaertel, G. W. Hammett, and D. R. Mikkelsen, Phys. Plasmas 20, 022305 (2013). (Copyright) arxiv.

2012

"Gyrokinetic studies of the effect of beta on drift-wave stability in the National Compact Stellarator Experiment", J. A. Baumgaertel, G. W. Hammett, D. R. Mikkelsen, M. Nunami, and P. Xanthopolous, Phys. Plasmas 19, 122306 (2012). (Copyright)

"Progress in Simulating Turbulent Electron Thermal Transport in NSTX", W. Guttenfelder, J. L. Peterson, J. Candy, S. Kaye, Y. Ren, R. Bell, G. W. Hammett, B. J. LeBlanc, D. Mikkelsen, W. M. Nevins, and H. Yuh. Nucl. Fusion 53 (2013) 093022.

"Progress in Simulating Turbulent Electron Thermal Transport in NSTX", W. Guttenfelder, J. L. Peterson, J. Candy, S. Kaye, Y. Ren, R. Bell, E. A. Belli, G. Hammett, B. LeBlanc, D. Mikkelsen, W. Nevins, G. Staebler, and H. Yuh, Proc. 24th IAEA Fusion Energy Conference (2012), San Diego, CA USA, TH/6-1.

"PTRANSP Tests of TGLF and Predictions for ITER", R. Budny, X. Yuan, S. Jardin, G. Hammett, and G. Staebler, Proc. of the 24th IAEA Fusion Energy Conference (2012), San Diego, CA USA, ITR/P1-29.

"Characteristics of Microturbulence in H-mode Plasma of LHD" K. Tanaka, T. Kobayashi, K. Toi, S. Inagaki, C. Michael, L. Vyacheslavov, D. Mikkelsen, J. Baumgaertel, G. Hammett, W. Guttenfelder, Y. Takemura, S. Sakakibara, Y. Suzuki, M. Yokoyama, K. Ida, Y. Ichihiro, R. Yasuhara, K. Narihara, T. Akiyama, T. Tokuzawa, and K. Kawahata, Proc. of the 24th IAEA Fusion Energy Conference (2012), San Diego, CA USA, EX/P7-03.

"Simulating the Effects of Stellarator Geometry on Gyrokinetic Drift-Wave Turbulence", J. A. Baumgaertel, Ph.D. Dissertation, Princeton University, May, 2012.

“Analytic and Numerical Study of Current-Driven Drift Waves and Microturbulence in Fusion Energy Devices”, Nadine Maria Kremer, Ulm University Diploma Thesis (2012).

"Scaling of linear microtearing stability for a high collisionality National Spherical Torus Experiment discharge", W. Guttenfelder, J. Candy, S. M. Kaye, W. M. Nevins, R. E. Bell, G. W. Hammett, B. P. LeBlanc, and H. Yuh, Phys. Plasmas 19, 022506 (2012) (Copyright)

"Suppressing Electron Turbulence and Triggering Internal Transport Barriers with Reversed Magnetic Shear in the National Spherical Torus Experiment", J. L. Peterson, R. Bell, J. Candy, W. Guttenfelder, G. W. Hammett, S. M. Kaye, B. LeBlanc, D. R. Mikkelsen, D. R. Smith, and H. Y. Yuh, Phys. Plasmas 19, 056120 (2012). 2011 APS-DPP Invited Talk. (Copyright)

"Simulation of microtearing turbulence in National Spherical Torus Experiment", W. Guttenfelder, J. Candy, S.M. Kaye, W.M. Nevins, E. Wang, J. Zhang, R.E. Bell, N.A. Crocker, G.W. Hammett, B.P. LeBlanc, D.R. Mikkelsen, Y. Ren, H. Yuh, Phys. Plasmas 19, 056119 (2012). 2011 APS-DPP Invited Talk. (Copyright)

2011

"Simulating gyrokinetic microinstabilities in stellarator geometry with GS2", J. A. Baumgaertel, E. A. Belli, W. Dorland, W. Guttenfelder, G. W. Hammett, D. R. Mikkelsen, G. Rewoldt, W. M. Tang, and P. Xanthopoulos Phys. Plasmas 18, 122301 (2011) (Copyright) arxiv.

"An Enhanced Nonlinear Critical Gradient for Electron Turbulent Transport Due To Reversed Magnetic Shear", J. L. Peterson, G. W. Hammett, D. R. Mikkelsen, H. Y. Yuh, J. Candy, W. Guttenfelder, S. M. Kaye, and B. LeBlanc. Arxiv. (It was later discovered that there were some issues related to how impurities were treated in these simulations so that the results appear to be for a different value of Z_eff*T_e/T_i than we first thought. Corrected versions of this work are described in Peterson's later Ph.D. Dissertation and 2011 APS invited talk paper.)

"Electromagnetic Transport from Microtearing Mode Turbulence", W. Guttenfelder, J. Candy, S. M. Kaye, W. M. Nevins, E. Wang, R. E. Bell, G. W. Hammett, B. P. LeBlanc, D. R. Mikkelsen, and H. Yuh, Phys. Rev. Lett., 106, 155004 (2011).

"A Fast Semi-implicit Method for Anisotropic Diffusion", P. Sharma and G.W. Hammett, J. Comp. Phys. 230, 4899 (2011) arxiv

2010

"Overview of the US collaborative program in stellarator experiments", D. A. Gates, C. Baylard, J. Baumgaertel, et al., Fusion Energy 2010 IAEA Meeting, Daejon, Rep. of Korea, ICC/P4-01.

"Climate Change, Nuclear Proliferation and Fusion Energy", R. J. Goldston, L. R. Grisham, G. W. Hammett, Fusion Energy 2010 IAEA Meeting, Daejon, Rep. of Korea, SEE/1-1Ra.

"Gyrokinetic statistical absolute equilibrium and turbulence", Jian-Zhou Zhu and Gregory W. Hammett, Phys. Plasmas 17, 122307 (2010). (Copyright) arxiv

"Experiments with liquid metal walls: Status of the lithium tokamak experiment", Robert Kaita, Laura Berzak, Dennis Boyle, Timothy Gray, Erik Granstedt, Gregory Hammett, Craig M. Jacobson, Andrew Jones, Thomas Kozub, Henry Kugel, Benoit Leblanc, Nicholas Logan, Matthew Lucia, Daniel Lundberg, Richard Majeski, Dennis Mansfield, Jonathan Menard, Jeffrey Spaleta, Trevor Strickler, John Timberlake, Jongsoo Yoo, L. Zakharov, Rajesh Maingi, Vlad Soukhanovskii, Kevin Tritz and Sophia Gershman, Fusion Eng. and Design 85, 874, November 2010.

"Direct multiscale coupling of a transport code to gyrokinetic turbulence codes", M. Barnes, I. G. Abel, W. Dorland, T. Goerler, G. W. Hammett, F. Jenko, Phys. Plasmas 17, 056109 (2010). (Copyright) APS-DPP09 Invited talk. (local) (arxiv)

2009

"Gyrokinetic Simulations of Spherical Tokamaks", C M Roach, I G Abel, R J Akers, W Arter, M Barnes, Y Camenen, F J Casson, G Colyer, J W Connor, S C Cowley, D Dickinson, W Dorland, A R Field, W Guttenfelder, G W Hammett, R J Hastie, E Highcock, N F Loureiro, A G Peeters, M Reshko, S Saarelma, A A Schekochihin, M Valovic, and H R Wilson, EPS 2009 Conf. invited talk, Plasma Physics and Controlled Fusion, 51, 124020 (2009). preprint.

"Linearized model Fokker-Planck collision operators for gyrokinetic simulations. II. Numerical implementation and tests", M. Barnes, I. G. Abel, W. Dorland, D. R. Ernst, G. W. Hammett, P. Ricci, B. N. Rogers, A. A. Schekochihin, T. Tatsuno, Physics of Plasmas 16, 072107 (2009) (Copyright) (2008 arxiv preprint).

"Astrophysical gyrokinetics: kinetic and fluid turbulent cascades in magnetized weakly collisional astrophysical plasmas," A. A. Schekochihin, S. C. Cowley, W. Dorland, G. W. Hammett, G. G. Howes, E. Quataert, T. Tatsuno, Astrophysical J. Supp. Ser., 182, 310-377 (2009) (Arxiv version, originally submitted 2007)

"Concurrent, parallel, multiphysics coupling in the FACETS project", J R Cary, J. Candy, J Cobb, R H Cohen, T Epperly, D J Estep, S Krasheninnikov, A D Malony, D C McCune, L McInnes, A Pankin, S Balay, J A Carlsson, M R Fahey, R J Groebner, A H Hakim, S E Kruger, M Miah, A Pletzer, S Shasharina, S Vadlamani, D Wade-Stein, T D Rognlien, A Morris, S Shende, G W Hammett, K Indireshkumar, A Yu Pigarov and H Zhang, J. Phys.: Conf. Ser. 180 012056 (2009).

2008

"Model Collision Operators for Numerical Gyrokinetics" I. G. Abel, M. Barnes, S. C. Cowley, W. Dorland, G. W. Hammett, A. A. Schekochihin, T. Tatsuno, Theory of Fusion Plasmas, Joint Varenna-Lausanne Int. Workshop (2008), AIP Conf. Proc. Vol. 1069 (2008).

"Effects of plasma shaping on nonlinear gyrokinetic turbulence", E. A. Belli, G. W. Hammett, and W. Dorland, Physics of Plasmas, 15, 092303, (2008). (Copyright)

"On 1D diffusion problems with a gradient-dependent diffusion coefficient," S.C. Jardin, G. Bateman, G.W. Hammett, L.P. Ku, J. Comp. Phys. 227, 8769 (2008). ( 2007 draft paper). (with errata / corrections).

"First results from core-edge parallel composition in the FACETS project", J. R. Cary, J. Candy, R. H. Cohen, et al., SciDAC 2008, J. of Phys.: Conf. Series 125, 012040 (2008).

"Kinetic Simulations of Magnetized Turbulence in Astrophysical Plasmas", G. G. Howes, W. Dorland, S. C. Cowley, G. W. Hammett, E. Quataert, A. A. Schekochihin, T. Tatsuno, Phys. Rev. Lett. 100, 065004 (2008). arxiv

"Gyrokinetic turbulence: a nonlinear route to dissipation through phase space", A. A. Schekochihin, S. C. Cowley, W. Dorland, G. W. Hammett, G. G. Howes, G. G. Plunk, E. Quataert, T. Tatsuno, Plasma Phys. Control. Fusion 50, 124024 (2008) (Invited talk, EPS Conference on Plasma Physics, 2008). arxiv

2007

"Dissipation-scale turbulence in the solar wind", G.G. Howes, S.C. Cowley, W. Dorland, G.W. Hammett, E. Quataert, and A. A. Schekochihin, in "Turbulence and Nonlinear Processes in Astrophysical Plasmas; 6th Annual International Astrophysics Conference", AIP Conference Proc. 932, 3 (2007).

"An Iterative Semi-Implicit Scheme with Robust Damping ," (pdf), N.F. Loureiro, G.W. Hammett, J. Comp. Phys. 227, 4518 (2008). arxiv (submitted June 2007, revised Dec. 2007).

"Electron Heating in Hot Accretion Flows," P. Sharma, E. Quataert, G.W. Hammett, J.M. Stone, ApJ 667, 714 (2007). arxiv

"Introducing FACETS, the Framework Application for Core-Edge Transport Simulations", J R Cary, J Candy, R H Cohen, S Krasheninnikov, D C McCune, D J Estep, J Larson, A D Malony, P H Worley, J A Carlsson, A H Hakim, P Hamill, S Kruger, S Muzsala, A Pletzer, S Shasharina, D Wade-Stein, N Wang, L McInnes, T Wildey, T Casper, L Diachin, T Epperly, T D Rognlien, M R Fahey, J A Kuehn, A Morris, S Shende, E Feibush, G W Hammett, K Indireshkumar, C Ludescher, L Randerson, D Stotler, A Yu Pigarov, P Bonoli, C S Chang, D A D'Ippolito, P Colella, D E Keyes, R Bramley and J R Myra, J. Phys. Conf. Ser. 78, 0120866 (2007). SciDAC 2007 conference.

"Verification of gyrokinetic delta f simulations of electron temperature gradient turbulence," W.M. Nevins, S.E. Parker, Y. Chen, J. Candy, A. Dimits, W. Dorland, G.W. Hammett, and F. Jenko, Phys. Plasmas 14, 084501 (2007) UCRL-JRNL-230864.

"A Model of Turbulence in Magnetized Plasmas: Implications for the Dissipation Range in the Solar Wind", Gregory G. Howes, Steven C. Cowley, William Dorland, Gregory W. Hammett, Eliot Quataert, Alexander A. Schekochihin, JGR 113, A05103 (2008) arxiv

"Preserving Monotonicity in Anisotropic Diffusion," Prateek Sharma, Gregory W. Hammett, J. Comp. Phys. 227, 123 (2007). arxiv.

"11th EU-US Transport Task Force workshop on transport in fusion plasmas", J.W. Connor, C. Angioni, P.H. Diamond, G.W. Hammett, C. Hidalgo, A. Loarte, and P. Mantica, Nucl. Fusion, 47, 361 (2007). Report on the 2006 EU-US TTF workshop held in Marseilles, Sept. 4-7.

2006

"Gyrokinetic Simulations of ETG and ITG Turbulence," A.M. Dimits, W.M. Nevins, D.E. Shumaker, G.W. Hammett, T. Dannert, F. Jenko, M.J. Pueschel, W. Dorland, S.C. Cowley, J.N. Leboeuf, T.L. Rhodes, J. Candy, C. Estrada-Mila, Nucl. Fus. 47, 817 (2007), Special issue of Nuclear Fusion, for the Fusion Energy 2006 IAEA conference, below. (2006 preprint)

"Gyrokinetic Simulations of ETG and ITG Turbulence," A.M. Dimits, W.M. Nevins, D.E. Shumaker, G.W. Hammett, T. Dannert, F. Jenko, W. Dorland, J.N. Leboeuf, T.L. Rhodes, J. Candy, C. Estrada-Mila, Proceedings of the 21st IAEA Conference, "Fusion Energy 2006", Chengdu, China, Oct. 16-21, 2006.

"Kinetic Effects on Turbulence Driven by the Magnetorotational Instability in Black Hole Accretion," P. Sharma, Ph.D. Dissertation, Princeton University (August 2006). (local copy)

"Studies of Numerical Algorithms for Gyrokinetics and the Effects of Shaping on Plasma Turbulence," E.A. Belli, Ph.D. Dissertation, Princeton University (April 2006). (local copy)

"Characterizing electron temperature gradient turbulence via numerical simulation", W.M. Nevins, J. Candy, S. Cowley, T. Dannert, A. Dimits, W. Dorland, C. Estrada-Mila, G.W. Hammett, F. Jenko, M.J. Pueschel, D.E. Shumaker, Phys. Plasmas 13, 122306 (2006).

"Shearing Box Simulations of the MRI in a Collisionless Plasma," P. Sharma, G.W. Hammett, E. Quataert, J.M. Stone (2006) ApJ 637, 952. astro-ph/0508502

"Astrophysical Gyrokinetics: Basic Equations and Linear Theory," Gregory G. Howes, Steven C. Cowley, William Dorland, Gregory W. Hammett, Eliot Quataert, Alexander A. Schekochihin, Ap.J 651, 590 (2006), astro-ph/0511812.

2005

"Discrete particle noise in particle-in-cell simulations of plasma microturbulence," W. M. Nevins G. W. Hammett, A. M. Dimits, W. Dorland and D. E. Shumaker, Phys. Plasmas 12, 122305 (2005). Preprint version: UCRL-JRNL-212536, August 2005. Addendum.

"Plasma instabilities and magnetic-field growth in clusters of galaxies," A.A.Schekochihin, S.C.Cowley, R.M.Kulsrud, G.W.Hammett, P.Sharma, astro-ph/0501362, Ap.J. 629, 139 (2005).

"A Numerical Instability in an ADI Algorithm for Gyrokinetics", E. A. Belli and G. W. Hammett, PPPL-4034, Comp. Phys. Comm. 172, 119 (2005).

2004

"Magnetised plasma turbulence in clusters of galaxies", A. A. Schekochihin S. C. Cowley, R. M. Kulsrud, G. W. Hammett, P. Sharma, Proceedings of "Magnetized Plasma in Galaxy Evolution", Sep. 27th-Oct. 1st 2004, Jagiellonian University, Krakow, Poland. astro-ph/0411781.

"Saturated State of the Nonlinear Small-Scale Dynamo", A. A. Schekochihin, S. C. Cowley, S. F. Taylor, G. W. Hammett, J. L. Maron, and J. C. McWilliams, Phys. Rev. Lett 92 (2004), 084504; www.arxiv.org/abs/astro-ph/0308252, Aug. 14, 2003.

2003

"Transition from collisionless to collisional magnetorotational instability", Prateek Sharma, Gregory W. Hammett, Eliot Quataert, Astrophysical J. 596 (2003) 1121, www.arxiv.org/abs/astro-ph/0305486 .

"Collisional Effects on the Kinetic MRI", P. Sharma, G.W. Hammett, E. Quataert, AGN Physics with the Sloan Digitial Sky Survey, Proceedings of a conference held in Princeton, 27-31 July 2003, G. T. Richards, P.B. Hall, Ed. ASP Conference Series, Vol. 311 (2004).

"Non-existence of normal tokamak equilibria with negative central current", G.W. Hammett, S.C. Jardin, B.C. Stratton. Phys. Plasmas 10, 4048 (2003). (Copyright) arXiv:physics/0303026, PPPL-3788 (Feb. 24 vs.).

"Stabilizing impact of high gradient of beta on microturbulence", C. Bourdelle, W. Dorland, X. Garbet, G.W. Hammett, M. Kotschenreuther, G. Rewoldt, E.J. Synakowski, Phys. Plasmas 10, 2881 (2003) (Copyright) Dec. 16, 2002 preprint.

"Microturbulence, Heat, and Particle Fluxes in JET and DIII-D ITB Plasmas with Highly Reversed Magnetic Shear", R.V. Budny, R. Andre, C.D. Challis, W. Dorland, R. Dux, D.R. Ernst, C. Giroud, C.W. Gowers, C.M. Greenfield, N. Hawkes, G. Hammett, W. Houlberg, T.C. Luce, M.A. Makowski, D. Mikkelsen, M. Murakami, R. Prentice, G. Staebler, B. Stratton, M. Wade, W.P. West, and contributors to the EFDA-JET and DIII-D Work Programs, 30th Eur. Phys. Soc. Conf. on Contr. Fusion and Plasma Physics, St. Petersburg, July 2003 (PPPL-3841).

2002

"A model of nonlinear evolution and saturation of the turbulent MHD dynamo", A.A. Schekochihin, S.C. Cowley, G.W. Hammett, J.L. Maron, J.C. McWilliams, New J. Phys, 4, 84 (2002). ( arXiv:astro-ph/0207503)

"The nonlinear small-scale dynamo and isotropic MHD turbulence", A.A. Schekochihin, S.C. Cowley, G.W. Hammett, J.L. Maron, J.C. McWilliams, Proc. 29th EPS Conf. on Plasma Phys. and Contr. Fusion, Montreux, 17-21 June 2002, ECA Vol. 26B, P-4.035 (2002) arXiv:astro-ph/0207151.

"The Magnetorotational Instability in a Collisionless Plasma", Eliot Quataert, William Dorland, and Gregory W. Hammett. ApJ 577, 524 (2002) arXiv:astro-ph/0205492. (Local pdf)

"Models for the pedestal temperature at the edge of H-mode tokamak plasmas", T. Onjun, G. Bateman, A.H. Kritz, G.W. Hammett, Physics of Plasmas 9, 5018 (2002). Phys. Plasmas 9, 5018 (2002). (Copyright)

"Non-white noise and a multiple-rate Markovian closure theory for turbulence", G.W. Hammett and J.C. Bowman, Submitted to Phys. Fluids, Feb. 2002, arXiv:physics/0203031. (Local pdf and Maple worksheets.)

"Comparing simulation of plasma turbulence with experiment", D.W. Ross, R.V. Bravenec, W. Dorland, M.A. Beer, G.W. Hammett, G.R. McKee, R.J. Fonck, M. Murakami, K.H. Burrell, G.L. Jackson, G.M.Staebler, Phys. Plasmas 9, 177 (2002). (Copyright)

"Gyrokinetic Calculations of Microinstabilities and Transport during RF H-Modes on Alcator C-Mod", M.H. Redi, C. Fiore, P. Bonoli, C. Bourdelle, R. Budny, W. D. Dorland, D. Ernst, G. Hammett, D. Mikkelsen, J. Rice, and S. Wukitch, 29th EPS Conf. on Plasma Physics and Contr. Fusion, June 17-21, 2002, Montreux, Switzerland, PPPL-3707.

2001

"Microstability analysis of NSTX plasmas", C. Bourdelle, R.E. Bell, W. Dorland, G.W. Hammett, W.A. Houlberg, S. Kaye, B.P. LeBlanc, D. McCune, F. Paoletti, G. Rewoldt, E.J. Synakowski, International Conf. on Spherical Tori (Brazil, 2001).

"Critical Gradient Formula for Toroidal Electron Temperature Gradient Modes", F. Jenko, W. Dorland, and G. W. Hammett, Phys. Plasmas 8, 4096 (2001).

"A Landau fluid model for electromagnetic plasma microturbulence", P.B. Snyder, G.W. Hammett, Phys. Plasmas 8, 3199 (2001). (preprint)

"Electromagnetic Effects on Plasma Microturbulence and Transport", P.B. Snyder, G.W. Hammett, September, 2000 (preprint, revised version of GA-A23351), Phys. Plasmas 8, 744 (2001).

2000

"Gyrokinetic Simulations of Tokamak Microturbulence", W. Dorland, B.N. Rogers, F. Jenko, M. Kotschenreuther, G.W. Hammett, D Mikkelsen, D.W. Ross, M.A. Beer, P.B. Snyder, R. Bravenec, M. Greenwald, D. Ernst, R. Budny, 18th IAEA Fusion Energy Conference (Italy, 2000).

"Local Physics Basis of Confinement Degradation in JET ELMy H-mode Plasmas and Implications for Tokamak Reactors", R.V. Budny, B. Alper, D. Borba, D.R. Ernst, C. Gowers, K. Gunther, T.S. Hahm, G. Hammett, N. Hawkes, L. Horton, G. Saibene, R. Sartori, E. Synakowski, M.G. von Hellermann, and Z.-D. Zastrow. 18th IAEA Fusion Energy Conference (Italy, 2000), Nucl. Fusion 42, 66 (Jan. 2002) PPPL-3542.

"Transitionless enhanced confinement and the role of radial electric field shear", D.R. Ernst, R.E. Bell, M.G. Bell, R.V. Budny, B. Coppi, W.M. Dorland, G.W. Hammett, R.J. Hawryluk, K.W. Hill, M.T. Kotschenreuther, D.K. Mansfield, D.R. Mikkelsen, H.K. Park, M. Porkolab, S.D. Scott, G. Schmidt, E. Synakowski, M.C. Zarnstorff, and the TFTR Group, Phys. Plasmas 7, 615-625 (2000). PPPL-3375.

"High Performance Tokamak Microturbulence Visualization With AVS/Express", (MS .doc) Gary D. Kerbel, Visualization Development Environments 2000 Proceedings, (Princeton, April 27-28, 2000).

1999

"Comparative studies of core and edge transport barrier dynamics of DIII-D and TFTR tokamak plasmas", Synakowski EJ, Beer MA, Bell RE, Burrell KH, Carreras BA, Diamond PH, Doyle EJ, Ernst D, Fonck RJ, Gohil P, Greenfield CM, Hahm TS, Hammett GW, Levinton FM, Mazzucato E, McKee G, Newman DE, Park HK, Rettig CL, Rewoldt G, Rhodes TL, Rice BW, Taylor G, Zarnstorff MC, Nucl. Fusion 39, 1733 (1999).

"Highly radiative plasmas for local transport studies and power and particle handling in reactor regimes", Hill KW, Bell MG, Bell RE, Budny R, Bush CE, Ernst DR, Hammett GS, Mikkelsen DR, Park HK, Ramsey AT, Sabbagh SA, Scott SD, Synakowski EJ, Taylor G, Zarnstorff MC, Nucl. Fusion 39, 1949-1954 (1999).

"Potential Methods For Improving Pedestal Temperatures and Fusion Performance", G.W. Hammett, W. Dorland, M.A. Beer, M. Kotschenreuther, contributed paper for workshop on Opportunities and Directions in Fusion Energy Science for the Next Decade (Snowmass, CO, July 1999). Snowmass Proceedings. Also available as PPPL-3360. Note alternate location for proceedings (if you view this PDF within a browser with the Adobe plugin, you can (at least on Windows machines) click on titles to see individual papers, but this probably won't work if you download and view the PDF directly on your computer) and alternate location of my paper.

"Gyrofluid Theory and Simulation of Electromagnetic Turbulence and Transport in Tokamak Plasmas", P.B. Snyder, Princetion Ph.D. Dissertation (1999).

"Comparisons and Physics Basis of Tokamak Transport Models and Turbulence Simulations", A.M. Dimits, G. Bateman, M.A. Beer, B.I. Cohen, W. Dorland, G.W. Hammett, C. Kim, J.E. Kinsey, M. Kotschenreuther, A.H. Kritz, L.L. Lao, J.Mandrekas, W.M. Nevins, S.E. Parker, A.J. Redd, D.E. Shumaker, R. Sydora, J.Weiland, UCRL-JC-135376, 8/24/1999; Phys. Plasmas 7, 969 (2000). Copyright notice. Preprints in PS, or PDF.

"Turbulence Suppression by ExB Shear in JET Optimized Shear Pulses", M.A. Beer, R.V. Budny, C.D. Challis, et.al., 26th EPS Conf. on Conf. on Contr. Fusion and Plasma Physics, Maastricht, June 1999, ECA Vol. 23J, 1669 (1999).

"Simulations of Electromagnetic Turbulence and Transport in Tokamak Plasmas", P.B. Snyder, G.W. Hammett, M.A. Beer, W. Dorland, Proc. 26th EPS Conf. on Contr. Fusion and Plasma Physics, Maastricht, June 1999, ECA Vol. 23J, 1685 (1999).

"Theory Based Models of Turbulence and Anomalous Transport", G.W. Hammett, invited talk, American Physical Society Centennial Meeting (Atlanta, 1999).

"Tests of local transport theory and reduced wall impurity influx with highly radiative plasmas in the tokamak fusion test reactor", K.W. Hill, S.D. Scott, M. Bell, R. Budny, C.E. Bush, R.E.H. Clark, B. Denne-Hinnov, D.R. Ernst, G.W. Hammett, D.R. Mikkelsen, D. Mueller, J. Ongena, H.K. Park, A.T. Ramsey, E.J. Synakowski, G. Taylor, M.C. Zarnstorff, and the TFTR Group, Phys. Plasmas 6: (3) 877-884 MAR 1999 PPPL-3335.

1998

"The Dynamics of Small-Scale Turbulence-Driven Flows", M.A. Beer and G.W. Hammett, invited talk, published in Proc. of the Joint Varenna-Lausanne Int. Workshop on Theory of Fusion Plasmas (August 1998), p.19 (Varenna, Italy 1998).

"Shearing rate of time-dependent E x B flow", T.S. Hahm, M.A. Beer, Z. Lin, G.W. Hammett, W.W. Lee, and W.M. Tang, Phys. Plasmas 6, 922 (1999). Based on APS-DPP-98 invited talk.

"Fusion plasma experiments on TFTR: A 20 year retrospective", R.J. Hawryluk, S. Bath, W. Blanchard, M. Beer, et.al., incl. G.W. Hammett and W. Dorland. Phys. Plasmas 5, 1577 (1998).

1997

"Landau fluid models of collisionless magnetohydrodynamics", P.B. Snyder, G.W. Hammett, and W. Dorland, Phys. Plasmas 4, 3974 (1997). PS, or preprint versions. errata.

"TFTR DT experiments", Strachan JD, Batha S, Beer M, Bell MG, et al., incl. the TFTR team and G.W. Hammett, Plasma Phys. and Controlled Fusion 39, B103-B114 Suppl. 12B Dec 1997.

"Dissipative Closures for Statistical Moments, Fluid Moments, and Subgrid Scales in Plasma Turbulence" S.A. Smith, Princeton Ph.D. Dissertation, 1997.

"Eddy viscosity and hyperviscosity in spectral simulations of 2D drift wave turbulence", S.A. Smith and G.W. Hammett, Phys. Plasmas 4, 978 (1997).

"A gyro-Landau-fluid transport model", R.E. Waltz, G.M. Staebler, W. Dorland, G.W. Hammett, M. Kotschenreuther, J.A. Konings, Phys. Plasmas 4, 2482 (1997). (APS-DPP96 invited paper.)

"The Roles of Electric Field Shear and Shafranov Shift in Sustaining High Confinement in Enhanced Reversed Shear Plasmas on the TFTR Tokamak", E.J. Synakowski, S.H. Batha, M.A. Beer, et.al., Phys. Rev. Lett. 78, 2972 (1997).

1996

"Review of D-T results from TFTR", R.J. Hawryluk, C.W. Barnes, S. Batha, M. Beer, et al., incl. the TFTR team, Fusion Technology 30, 648 (1996).

"Gyrofluid Simulations of Turbulence Suppression in Reversed-Shear Experiments on the Tokamak Fusion Test Reactor", M. A. Beer, G. W. Hammett, G. Rewoldt, E. J. Synakowski, M. C. Zarnstorff, and W. Dorland, 1996 APS invited paper, Phys. Plasmas, Vol. 4, No. 5, May 1997, pages 1792-1799. preprints: PS PDF

"Local Transport Barrier Formation and Relaxation in Reverse-Shear Plasmas on the TFTR Tokamak", E.J. Synakowski, S.H. Batha, M.A. Beer, et.al.. 1996 APS invited paper, Phys. Plasmas 4, 1736 (1997).

"First Principles Calculations of Tokamak Energy Transport", M. Kotschenreuther, W. Dorland, Q.P. Liu, G.W. Hammett, M.A. Beer, et.al., 16th IAEA Fusion Energy Conference (Montreal, 1996).

"Isotope Scaling of Heating and Confinement in Multiple Regimes of TFTR", S.D. Scott, G.W. Hammett, C.K. Phillips, E.J. Synakowski, et.al., 16th IAEA Fusion Energy Conference (Montreal, 1996)

"A Comprehensive Gyro-Landau-Fluid Transport Model", R.E. Waltz, G.M. Staebler, G. Hammett, and J.A. Konings, 16th IAEA Fusion Energy Conference (Montreal, 1996).

"Turbulence and Transport in Enhanced Confinement Regimes of Tokamaks: Simulation and Theory", T.S. Hahm, M. Artun, M.A. Beer, G.W. Hammett, W.W. Lee, Z. Lin, H.E. Mynick, S.E. Parker, R.A. Santoro, G. Rewoldt, and W.M. Tang, 16th IAEA Fusion Energy Conference (Montreal, 1996).

"Turbulent Fluctuations in the Main Core of TFTR Plasmas with Negative Magnetic Shear", E. Mazzucato, S.H. Batha, M. Beer, et.al. 16th IAEA Fusion Energy Conference (Montreal, 1996).

"3D Simulations of Tokamak Plasma Turbulence: Experimental Tests and Predictions", W. Dorland, M. Kotschenreuther, Q.P. Liu, M.A. Beer, G.W. Hammett, invited talk, published in Proc. of the Joint Varenna-Lausanne Int. Workshop on Theory of Fusion Plasmas (August 1996), Varenna, Italy 1996 (Editrice Compositori, Bologna, Italy), p. 185.

"Bounce Averaged Trapped Electron Fluid Equations for Plasma Turbulence", M. A. Beer and G. W. Hammett, Phys. Plasmas, Vol. 3, No. 11, November 1996, pages 4018-4022. PPPL report .

"Toroidal Gyrofluid Equations for Simulations of Tokamak Turbulence", M. A. Beer and G. W. Hammett, Phys. Plasmas, Vol. 3, No. 11, November 1996, pages 4046-4064. PPPL report .

"Turbulent Fluctuations in TFTR Configurations with Reversed Magnetic Shear", E. Mazzucato, S. H. Batha, M. A. Beer, ..., T.S. Hahm, G.W. Hammett, et al., Phys. Rev. Lett., Vol. 77, No. 15, October 1996, p. 3145. PDF

1995

"Action at distance and Bohm scaling of turbulence in a tokamak", X. Garbet and R.E. Waltz, Phys. Plasmas 2, 1898 (1996). 1995 APS-DPP Invited Talk.

"Interactive Scientific Exploration of Gyrofluid Tokamak Turbulence" G.D. Kerbel, T. Pierce, J.L. Milovich, D.E. Shumaker, A. Verlo, R.E. Waltz, G.W. Hammett, M.A. Beer, W. Dorland, Int. Journal of Supercomputing Applications, 10, 182-198 (1996). SuperComputing95 Invited Talk.

"Field-aligned Coordinates for Nonlinear Simulations of Tokamak Turbulence", M. A. Beer, S. C. Cowley, and G. W. Hammett, Phys. Plasmas, Vol. 2, No. 7, July 1995, pages 2687-2700. preprint

"The Numerical Tokamak Project: simulation of turbulent transport," B.I. Cohen, D.C. Barnes, J.M. Dawson, G.W. Hammett, W.W. Lee, G.D. Kerbel, J.-N. Leboeuf, P.C. Liewer, T. Tajima, R.E. Waltz, Comp. Phys. Commun. 87, 1 (1995).

"Comparison of Initial Value and Eigenvalue Codes for Kinetic Toroidal Plasma Instabilities," M. Kotschenreuther, G. Rewoldt, and W.M. Tang, Comp. Phys. Comm. 88, 128 (1995). errata.

1994

"Gyrofluid Models of Turbulent Transport in Tokamaks" M.A. Beer, Princeton Ph.D. Dissertation, 1994.

Quantitative Predictions of Tokamak Energy Confinement from First-Principles Simulations with Kinetic Effects, M. Kotschenreuther, W. Dorland, M. A. Beer, and G. W. Hammett, Phys. Plasmas, Vol. 2, No. 6, June 1995, pages 2381-2389. errata.

"Advances in the simulation of toroidal gyro-Landau fluid model turbulence", R.E. Waltz, G.D. Kerbel, J. Milovich, G.W. Hammett, Physics of Plasmas 2, 2408 (1995). APS-DPP 1994 Invited Talk.

"Advances in Simulating Tokamak Turbulent Transport" G.W. Hammett, M.A. Beer, J.C. Cummings, W. Dorland, W.W. Lee, H.E. Mynick, S.E. Parker, R.A. Santoro, M. Artun, H.P. Furth, T.S. Hahm, G. Rewoldt, W.M. Tang, R.E. Waltz, G.D. Kerbel, J.L. Milovich, IAEA-CN-60/D-8, 1994 IAEA Conference (Seville, Spain), in Proc. of the Fifteenth Int. Conf. on Plasma Physics and Contr. Nucl. Fusion Res., Vol. III, p. 273

"Comparison of Nonlinear Toroidal Turbulence Simulations with Experiment" W. Dorland, M. Kotschenreuther, M. A. Beer, G. W. Hammett, R. E. Waltz, R. R. Dominguez, P. M. Valanju, W. H. Miner, Jr., J. Q. Dong, W. Horton, F. L. Waelbroeck, T. Tajima, and M. J. LeBrun, 1994 IAEA Conference (Seville, Spain)

"Toroidal gyro-Landau fluid model turbulence simlulations in a nonlinear ballooning mode representation with radial modes", R.E. Waltz, G.D. Kerbel, and J. Milovich, Physics of Plasmas 1, 2229 (1994).

"Comparisons of Gyrofluid and Gyrokinetic Simulations", S. E. Parker, W. Dorland, R. A. Santoro, M. A. Beer, Q. P. Liu, W. W. Lee, and G. W. Hammett, Phys. Plasmas, Vol. 1, No. 5, May 1994, pages 1461-1468.

"Hyperviscosity and the Subgrid Closure Problem for 2D drift Wave Turbulence", S.A. Smith, G.W. Hammett, S.A. Orszag, Proc. of the Int. Conf. on the Numerical Simulation of Plasmas (Valley Forge, 1994).

"Numerical Tokamak Project Code Comparison", R. E. Waltz, B. I. Cohen, M. A. Beer, A. M. Dimits, W. Dorland, S. E. Parker, R. A. Santoro, R. D. Sydora, and H. V. Wong, LLNL Lab Report UCRL-ID-117670, June, 1994.

"Isotope Scaling and Eta_i Mode with Impurities in Tokamak Plasmas', J. Q. Dong, W. Horton, and W. Dorland, Phys. Plasmas, 1 (1994) 3635.

1993

"Developments in the Gyrofluid Approach to Tokamak Turbulence Simulations", G. W. Hammett, M. A. Beer, W. Dorland, S. C. Cowley, and S. A. Smith, Plasma Phys. Control. Fusion , Vol. 35, 1993, pages 973-985. Invited talk at the 1993 International Sherwood Fusion Theory Conference. (errata)

"Gyrofluid Models of Plasma Turbulence" W.D. Dorland, Princeton Ph.D. Dissertation, 1993. ( pdf version )

"Gyrofluid Turbulence Models with Kinetic Effects," W. Dorland and G. W. Hammett, Phys. Fluids B, 5 (812), 1993.

"The Gyrofluid Approach to Simulating Tokamak Turbulence", G. W. Hammett, W. Dorland, M. A. Beer, and F. W. Perkins, in New Ideas in Tokamak Confinement, M. N. Rosenbluth, Ed., American Institute of Physics, 1993, pages 199-216.

"Nonlinear Gyrofluid Model of ITG Turbulence" , W. Dorland, G. W. Hammett, T. S. Hahm, and M. A. Beer, in U.S.-Japan Workshop Ion Temperature Gradient Driven Turbulent Transport (Austin, Texas, January 1993), W. Horton, M. Wakatani, and A. Wootton, Eds., AIP Conf. Proc. 284

"The Marginal Stability of Experimental Profiles", M. Kotschenreuther, in Ion Temperature Gradient Driven Turbulent Transport, W. Horton, M. Wakatani, and A. Wootton, Eds., American Institute of Physics, 1993.

"Toroidal turbulence simulations with gyro-Landau fluid in a nonlinear ballooning mode representions," R. E. Waltz, and G.D. Kerbel, Proceedings of US. Japan Workshop on Ion Temperature Gradient Driven Turbulence, Austin TX Jan 1993 p 271 AIP Press.

"Local shear in general magnetic stellarator geometry", R. E. Waltz and A. H. Boozer, Phy Fluids B5 (1993) 2201.

1992

"Profile characterstics of H-mode bifurcation models, and turbulence simulations with gyro-Landau fluid models in slab and toroidal geometry", G. M. Staebler, R. E. Waltz, M. A. Beer, R. R. Dominguez, W. Dorland, C. M. Greenfield, G. W. Hammett, F. L. Hinton, G. D. Kerbel, T. K. Kurki-Suonio, and J. C. Wiley in Plasma Physics and Controlled Nuclear Fusion Research, 1993, IAEA, Vienna.

"Simulations for confinement in near-fusion experiments", M. Kotschenreuther, H.L. Berk, ... B.Cohen, in Plasma Physics and Controlled Nuclear Fusion Research 1992 (IAEA, Vienna, 1993), Vol. 2, p. 11.

"Gyro-Landau fluid models for toroidal geometry", R.E. Waltz, R.R. Dominguez,and G.W. Hammett. Phy Fluids B4 (1992) 3138.

"Fluid Models of Phase Mixing, Landau Damping, and Nonlinear Gyrokinetic Dynamics,", G. W. Hammett, W. Dorland and F. W. Perkins, Phys. Fluids B4, 2052 (1992). (Copyright) APS-DPP 1991 invited talk. Errata.

"Parallel computational techniques in the simulation of gyro-landau fluid models of tokamak eta-i turbulence", G. D Kerbel, R.E. Waltz, and G.W. Hammett, in the Proceedings of Advances in the Simulation and Modeling of Thermonuclear Plasma, IAEA Technical Meeting, Montreal June 15-19, 1992.

1990

"Novel Computational Techniques to Predict Transport in Confinement Devices, and Applications to Ion-Temperature-Gradient Driven Turbulence," M. Kotschenreuther et.al., in Plasma Physics and Controlled Nuclear Fusion Research 1990 (IAEA, Vienna, 1991), Vol. 2, p. 361.

"Fluid Models for Landau Damping with Application to the Ion-Temperature-Gradient Instability", G.W. Hammett and F.W. Perkins, Phys. Rev. Lett. 64, 3019 (1990). errata

1986

"Fast Ion Studies of Ion Cyclotron Heating in the PLT Tokamak", G. W. Hammett, Princeton University Ph.D. Dissertation, 1986. Available as number GAX86-12694 from University Microfilms International, 300 N. Zeeb Road, Ann Arbor, MI 48106.

The above includes all of my papers starting from 1998, and many of our gyrofluid/gyrokinetic papers from before that, but is missing many of my more experimental fusion papers from before 1998. For those, see

My 2008 bibliography

Some of the above papers are available online. To see them, you may need a postscript viewer, such as the free ghostview, and/or a pdf viewer such as the free Adobe Acrobat viewer. In some cases you may need to uncompress *.gz files using the gnu/unix gunzip utility or winzip.

Ph.D. Theses and other good starting references

Selected unpublished talks and posters since 1998

List of Invited Talks (some unpublished) and Papers up to 1996

List of many of my papers, from the NASA Physics and Astronomy Abstract Database at the Harvard-Smithsonian.

List of my papers at www.arXiv.org . (I've only been posting preprints at arxiv.org in the last couple of years, so there aren't very many here yet.) arXiv.org is a very useful service for archiving and fostering rapid scientific communication, and is widely used in some fields such as astrophysics.)