fptg

The Fusion and Astrophysical Plasma Physics Group (FAPP) at University of California San Diego studies the physics of plasma—hot, ionized gas—with the aims of advancing fusion energy and humankind’s understanding of the universe.


Research

Members of the Fusion and Astrophysical Plasma Physics Group (FAPP) develop theoretical framework models of how plasmas move and interact with magnetic fields and boundaries. Numerical simulations are used to model turbulence, transport, gradient relaxation, pattern formation, and system stability, among other properties.

These models provide insight into the phenomenology of plasma and help to guide large-scale simulations used to develop fusion energy technology.


Projects

Avalanching and turbulence spreading

How does turbulence and turbulent mixing propagate and penetrate stable regions?

Zonal flow scale selection and staircase formation

Why do zonal flow patterns select the scale they do? What are the consequences?

Flow pattern formation in linear devices CSDX

How do azimuthal (zonal) and axial flows interact and compete for free energy?

Cosmic ray acceleration

How are high energy cosmic rays accelerated?
How do plasma physics processes accelerate a simple nucleon to the energy of a home run baseball in flight?

L → H transition

What is the physics of the forward and back transitions to/from the remarkable good confinement state of H-mode?

Elasticity in turbulent spinodal decompositions

What determines the size of the blobs formed? What properties does the spinodal decomposition turbulence have?


Also see Publications.


Presentations

"Multi-scale and Multi-step: Zonal Shearing Patterns in Drift-ETG Turbulence”
P.H. Diamond (presenter)
Poster Presentation, US/EU Transport Task Force Workshop — Williamsburg, Virginia, USA, 26 April 2017

“Pattern Formation in Magnetically Confined Plasmas: Why It Matters”
P.H. Diamond (presenter)
Oral Presentation, Umezawa Memorial Colloquium, Department of Physics, University of Alberta — Alberta, Canada, May 2017

“Stochastic Phase Dynamics in Turbulent Regimes: some thoughts toward a unified model”
P.H. Diamond (presenter) (with Z.B. Guo, P.W. Xi, X.-Q. Xu)
DIII-D Science Meeting 2017 — 02 June 2017

“Mode Competition, Saturation Mechanisms and Spatial Patterns in Multi-scale Turbulence – a Selected Overview”
P.H. Diamond (presenter)
Invited Talk, Asia-Pacific Transport Working Group (APTWG), Asia-Pacific Plasma Theory Conference (APPTC), Nagoya University — Nagoya, Japan, 06 June 2017

“On the Physics of Avalanche Formation in Confined Plasmas”
P.H. Diamond (presenter)
Invited Talk, 9th Festival de Théorie — Aix-en-Provence, France, 04 July 2017

“Synchronization and Phase Dynamics — An Introduction”
P.H. Diamond (presenter)
Invited Lecture, 9th Festival de Théorie — Aix-en-Provence, France, 04 July 2017

“Elastic Turbulence in the Cahn–Hilliard–Navier–Stokes System — A New Look at Familiar Themes in Turbulence”
P.H. Diamond (presenter), X. Fan, and L. Chacon)
Invited Talk, AAPPS-DPP — Chengdu, China, 18 September 2017

“Selected Topics in MHD” (series of four pedagogical lectures given as a Visiting Professor)
P.H. Diamond (presenter)
Invited Lectures, SWIP — Chengdu, China, September 2017

“Transport of Energetic Particles in Astrophysical Plasmas: from Rectilinear to Diffusive Propagation”
M. Malkov (presenter)
Invited Talk, 16th Annual International Astrophysics Conference — Santa Fe, New Mexico, USA, March 2017

“Competition of Mean Perpendicular and Parallel Flows in a Linear Device”
J.C. Li (presenter), P.H. Diamond, R. Hong, and G. Tynan
Poster Presentation, US/EU Transport Task Force — Williamsburg, Virginia, USA, 26 April 2017

“Outstanding Problems in Astroparticle Physics for Plasma Physicists”
M. Malkov (presenter)
Invited Seminar, Joint Seminar Mechanical & Aerospace Engineering & Center For Energy Research, University of California San Diego — San Diego, California, USA, 12 April 2017

“The Edge Shear Flows and Particle Transport near Density Limit of the HL-2A Tokamak”
Hong, R. (presenter), G.R. Tynan, P.H. Diamond, L. Nie, D. Guo, R. Ke, T. Long, Y. Wu, B. Yuan, and M. Xu.
Oral Presentation, US/EU Transport Task Force Workshop — Williamsburg, Virginia, USA, 25 April 2017

“A Model for Axial Flow and Profile Evolution in the CSDX Linear Device”
R. Hajjar (presenter), P.H. Diamond, R. Hong, S. Thakur, and G.R. Tynan
Poster Presentation, US/EU Transport Task Force — Williamsburg, Virginia, USA, 27 April 2017

"Cascades, ‘Blobby’ Turbulence, and Target Pattern Formation in Elastic Systems”
X. Fan (presenter), P.H. Diamond, and Luis Chacón
Poster Presentation, Sherwood Fusion Theory Conference, MIT Plasma Science and Fusion Center — Annapolis, Maryland, USA, 02 May 2017

“Zonal Flow Patterns: How Toroidal Coupling Induces Phase Jumps and Shear Layers”
Guo, Z. (presenter) and P.H. Diamond
Invited Talk, 9th Festival de Théorie Conference — Aix-en-Provence, France, 04 July 2017

“Competition of Mean Perpendicular and Parallel Flows in a Linear Device”
Li, J.C. (presenter), P.H. Diamond, R. Hong, and G.R. Tynan
Short Talk, 9th Festival de Théorie Conference — Aix-en-Provence, France, 18 July 2017

“Bistable Dynamics of Turbulence Intensity in a Corrugated Temperature Profile”
Guo, Z.B. (presenter) and P.H. Diamond
Invited Talk, AAPPS-DPP — Chengdu, China, 19 September 2017

“Turbulence in Elastic Media: A New Look at Classic Themes”
Fan, X. (presenter), P.H. Diamond, and L. Chacón
Invited Talk, APS—59th Annual Meeting — Milwaukee, Wisconsin, USA, 23 October 2017

“Anomalies in Cosmic Ray Composition: Explanation Based on Mass-to-Charge Ratio”
Hanusch, A, T. Liseykina, and M. Malkov (presenter)
Poster Presentation, APS—59th Annual Meeting — Milwaukee, Wisconsin, USA, 23 October 2017

“From Scatter-free to Diffusive Propagation of Energetic Particles: Exact Solution of Fokker–Planck Equation”
M.A. Malkov (presenter)
Poster Presentation, APS—59th Annual Meeting — Milwaukee, Wisconsin, USA, 23 October 2017

“Single Eddy Mixing in Cahn–Hilliard Flows”
Fan, X. (presenter), P.H. Diamond, and L. Chacón
Poster Presentation, APS—59th Annual Meeting — Milwaukee, Wisconsin, USA, 25 October 2017

“Dynamics of Staircase Formation: Reduced Model of Beta Plane Turbulence”
Diamond, P.H. and M.A. Malkov (presenter)
Poster Presentation, APS—59th Annual Meeting — Milwaukee, Wisconsin, USA, 25 October 2017

“Tracing the Pathway from Drift-wave Turbulence with Broken Symmetry to the Onset of Sheared Axial Flow”
Hong, R. (presenter), J.C. Li, S. Chakraborty-Thakur, R. Hajjar, P.H. Diamond, and G.R. Tynan.
Poster Presentation, APS—59th Annual Meeting — Milwaukee, Wisconsin, USA, 25 October 2017

“Modelling Axial Flow Generation and Profile Evolution in the CSDX Linear Device”
Hajjar, R.J. (presenter), P.H. Diamond, G.R. Tynan, R. Hong, and S. Thakur
Poster Presentation, APS—59th Annual Meeting — Milwaukee, Wisconsin, USA, 25 October 2017

“Studies of Turbulence-driven Flows: Competition in a Straight Magnetic Field and Revisiting Zonal Flow Saturation”
Li, J.C. (presenter), P.H. Diamond, R. Hong, and G. Tynan
Poster Presentation, APS—59th Annual Meeting — Milwaukee, Wisconsin, USA, 25 October 2017

Collisionless Shocks and Particle Acceleration, AGU 2016 Fall Meeting - San Francisco, CA - Mischa Malkov - Invited Talk - 12/13/16

Propagation of Energetic Particles Through Heliosphere - Exact Solution of Fokker-Planck equation, AGU 2016 Fall Meeting - San Francisco, CA - Mischa Malkov - Poster Presentation - 12/13/16

How Phase Patterns Define Zonal Flow Structure and Avalanche Scale, 58th Annual Meeting of the APS Division of Plasma Physics - San Jose, CA - Zhibin Guo and Patrick H. Diamond - Poster Presentation - 11/3/16

L-H Transition Threshold Physics at Low Collisionality, 58th Annual Meeting of the APS Division of Plasma Physics - San Jose, CA - Mischa Malkov - Poster Presentation - 11/3/16

Positron Anomaly in Galactic Cosmic Rays: Constraining Dark Matter Contribution, 58th Annual Meeting of the APS Division of Plasma Physics - San Jose, CA - Mischa Malkov - Poster Presentation - 11/3/16

Proton and Helium Injection Into First Order Fermi Acceleration at Shocks: Hybrid Simulation and Analysis, 58th Annual Meeting of the APS Division of Plasma Physics - San Jose, CA - Mischa Malkov - Poster Presentation - 11/3/16

Intrinsic Axial Flows in CSDX and Dynamical Symmetry Breaking in ITG Turbulence, 58th Annual Meeting of the APS Division of Plasma Physics - San Jose, CA - Jiacong Li - Poster Presentation - 11/3/16

Modeling Studies of Transport Bifurcation in the Drift Wave Turbulent Plasma of CSDX, 58th Annual Meeting of the APS Division of Plasma Physics - San Jose, CA - Reema Hajjar - Poster Presentation - 11/3/16

Cascades and Spectra of Elastic Turbulence in 2D: Spinodal Decomposition & MHD, 58th Annual Meeting of the APS Division of Plasma Physics - San Jose, CA - Xiang Fan - Poster Presentation - 10/31/16

New Results in Negative Viscosity Models for Fusion Plasma Dynamics, 26th IAEA Fusion Energy Conference - Kyoto, Japan - P.H. Diamond - Poster Presentation - 10/19/16

L-H Transition Threshold Physics at Low Collisionality, 26th IAEA Fusion Energy Conference - Kyoto, Japan - M.A. Malkov - Poster Presentation - 10/19/16

Phase Locking, Phase Slips, and Turbulence, 26th IAEA Fusion Energy Conference - Kyoto, Japan - Z.B. Guo - Poster Presentation - 10-18-16

Cascades and Spectra of 2D Cahn-Hilliard-Navier-Stokes (CHNS) Turbulence, Advances in Geophysical and Astrophysical Turbulence (AGAT) - Cargese, Corsica, France - X. Fan - Oral Talk - 8-5-16

Models of the L-H Transition: A Look at an Evolving Store, The 18th International Congress on Plasma Physics (ICPP) - Kaohsiung, Taiwan - P.H. Diamond - Oral Talk - 06-29-16

How Mesoscopic Staircases Condense to Macroscopic Barriers, The 6th Asia-Pacific Transport Working Group (APTWG) Meeting - Seoul, Korea - P.H. Diamond - Oral Talk - 06-21-16

Self Organized Criticality → OV with MFE Focus, The 6th Asia-Pacific Transport Working Group (APTWG) Meeting - Seoul, Korea - P.H. Diamond - Special Lecture - 06-21-16

Climbing the Potential Vorticity Staircase: How Profile Modulations Nucleate Profile Structure and Transport Barriers, Wave Interactions Workshop - WIN2016, Linz, Austria - P.H. Diamond - Key-Note Lecturer - 4-26-16

L-H Transition Threshold Physics for Weakly Collisional Plasmas, 2016 Transport Task Force Workshop, Denver, CO - Mikhail Malkov - Poster - 3-30-16

How Phase Patterns Define Zonal Flow Structure and Avalanche Scale, 2016 Transport Task Force Workshop, Denver, CO - Zhibin Guo - Poster - 3-31-16

On the Physics of Intrinsic Flow in Plasmas Without Magnetic Shear, 2016 Transport Task Force Workshop, Denver, CO - Jiacong Li - Plenary Session Talk - 3-31-16

Memory, cascades and Spectra in Models of 2D MHD and Elastic Turbulence, 2016 Transport Task Force Workshop, Denver, CO - Xiang Fan - Poster - 3-31-16

A Reduced Model of ExB and PV Staircase Formation and Dynamics, 57th Annual Meeting of the APS Division of Plasma Physics, Savannah, GA - Patrick H. Diamond - Poster - 11-18-15

Physics of the Power Threshold Minimum for L-H Transition, 57th Annual Meeting of the APS Division of Plasma Physics, Savannah, GA - Mikhail Malkov - Poster - 11-18-15

Potential Vorticity (PV) Dynamics and Models of Zonal Flow Formation, 57th Annual Meeting of the APS Division of Plasma Physics, Savannah, GA - Pei-Chun Hsu - Poster - 11-18-15

Symmetry Breaking by Parallel Flow Shear: Dynamics of Intrinsic Axial Flow in a Linear Device, and Its Implication for Intrinsic Rotation in Tokamaks. 57th Annual Meeting of the APS Division of Plasma Physics, Savannah, GA - Jiacong Li - Poster - 11-18-15

2D Spinodal Decomposition in Forced Turbulence: Structure Formation in a Challenging Analogue of 2D MHD Turbulence, 57th Annual Meeting of the APS Division of Plasma Physics, Savannah, GA - Xiang Fan - Poster - 11-18-15

Dynamics of Intrinsic Axial Flow in a Cylindrical Experimental Plasma, Journal Club Talk, La Jolla, CA - Jiacong Li - 11-13-15

Physics of the Power Threshold Minimum for L-H Transition, The 15th Workshop in H-Mode Physics and Transport Barriers, Max-Planck Institute for Plasma Physics, Munich, Germany - Mikhail Malkov - 10-21-15

Cosmic Ray Confinement and Transport Models for Probing Their Putative Sources, Max-Planck Institut fur Kernphysik, Heidelberg, Germany - Mikhail Malkov - 10-16-15

Relaxation and the Dynamics of Staircase Formation: Some Physics Beyond the Color VGs - Festival de Theorie - Pathways to Relaxation, Aix-en-Provence, France - P.H. Diamond - 7-17-15

2D Spinodal Decomposition in Forced Turbulence - Festival de Theorie - Pathways to Relaxation, Aix-en-Provence, France - Xiang Fan - 7-7-15

Pattern Formation in Magnetically Confined Plasmas: Why Staircases are Inevitable - Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou, China - P.H. Diamond - (Invited Talk) - 6-16-15

On the Collisionless Damping and Saturation of Zonal Flows - Plenary Talk, The 5th Asia Pacific Transport Working Group International Conference, Dalian, China - P.H. Diamond - 6-3-15

Potential Vorticity (PV) Dynamics and Models of Zonal Flow Formation - Thesis Defense - Pei-Chun Hsu - 05-29-15

Physics of the Power Threshold Minimum for L-H Transition - US-EU Transport Task Force 2015, Salem, MA - M.A. Malkov - (Plenary Talk) - 4-30-15

Potential Vorticity Dynamics and Models of Zonal Flow Formation - US-EU Transport Task Force 2015, Salem, MA - Pei-Chun Hsu - (Poster) - 4-30-15

Cosmic Ray Acceleration: the need and ways of doing it faster - Accelerating Cosmic-Ray Comprehension, Princeton, NJ - M.A. Malkov - 04-13-15

Pattern Formation in Confined Plasmas: Why Staircases are Inevitable in Drift-Rossby Turbulence - Science Nonlineaire, Paris, France - P.H. Diamond - 3-18-15

Cosmic Ray Self-Confinement, Escape and Transport - The 56th Annual Meeting of the APS Division of Plasma Physics, New Orleans, LA - M.A. Malkov - (Mini Conference) - 10-28-14

Ion-acoustic Shocks with Reflected Ions - The 56th Annual Meeting of the APS Division of Plasma Physics, New Orleans, LA - M.A. Malkov - (Poster) - 10-27-14

L-H Transition Dynamics and Power Threshold Minimum - The 56th Annual Meeting of the APS Division of Plasma Physics, New Orleans, LA - M.A. Malkov - (Poster) - 10-27-14

Selected CR Features from Plasma Physics Perspective - Workshop on Multiple Messengers and Challenges in Astroparticle Physics, L'Aquila, Italy - M.A. Malkov - (Invited Talk) - 10-8-14

Charlie Kennel's Contribution to the Physics of Collisionless Shocks and the Problem of Cosmic Rays - Science in the 21st Century-Charlie Fest 2014, La Jolla, CA - M.A. Malkov - 08-28-14

In Search of More Efficient Mechanisms for Cosmic Ray Acceleration - The 40th COSPAR Scientific Assembly, Moscow, Russia - M.A. Malkov - 8-4-14

Cosmic Ray Diffusion With Magnetic Focusing - Telegraph Equation? - The 40th COSPAR Scientific Assembly, Moscow, Russia - M.A. Malkov (Poster) - 8-3-14

Cross Phase Evolution and Its Role in ELM Bursts - 4th APTWG International Conference, Kyushu University, Fukuoka, Japan - P.H. Diamond - 6-10-14

Towards a Model of the L-H Power Threshold Scaling - U.S. - E.U. Joint Transport Task Force Workshop, San Antonio, TX - M.A. Malkov (Poster) - 4-23-14

Cross Phase Evolution and its Impact on ELM Dynamics - U.S. - E.U. Joint Transport Task Force Workshop, San Antonio, TX - P.H. Diamond - 4-22-14

"From Reconnection to Relaxation: A Pedagogical Tale of Two Taylors"
P.H. Diamond (presenter)
East-Asian School and Workshop on Laboratory, Space, Astrophysical Plasmas, Jeju Island, Korea — 26 June 2012


Collaborators and Affiliations

UC San Diego: Centers, Projects, and Facilities

Center for Astrophysics and Space Sciences

Center for Energy Research

San Diego Supercomputer Center at UC San Diego

Collaborating Research Organizations

Southwestern Institute of Physics — Chengdu, China

WCI Fusion Theory Institute, National Fusion Research Institute (NFRI) — Daejeon, Korea

General Atomics — San Diego, CA, USA

Observatoire de la Côte d’Azur — Nice, France


Sponsor Organizations

The work of FAPP members is primarily funded by the Office of Fusion Energy Sciences of the U.S. Department of Energy (Grant No. DE-FG02-04ER54738) and NASA.


Data Management Plan

In accordance with the U.S. Department of Energy Office of Science's Statement on Digital Data Management, our Data Management Plan to share data displayed as charts, figures, and images in our work is to include the underlying digital research data as supplementary information in the published work or indicate that the information can be found on this web site or another digital/institutional repository.