fptg

Fusion and Astrophysical Plasma Physics Group

The Fusion and Astrophysical Plasma Physics Group within the Physics Department and the Center for Astrophysics and Space Sciences at the University of California, San Diego is led by Professor Patrick H. Diamond, Distinguished Professor of Physics, and consists of two research scientists-- Mikhail Malkov, Fred Hinton, and four graduate student researchers-- and is managed by an administrative assistant.


Most Recent Publication:

Ion termperature and toridal velocity edge transport barriers in KSTAR - Won-Ha Ko, S.H. Ko, J.M. Kwon, P.H. Diamond, K. da, Y.M. Jeon, J.H. Lee, S.W. Yoon and J.G. Kwak

The structure and evolution of the ion temperature (T_i) and toroidal rotation (V_\phi) profile have been investigated in neutral beam injection (NBI)-heated KSTAR H-mode plasmas, both without and with resonant magnetic pertubations (RMPs). A clear disparity between the width of the V_\phi-pedestal and that of the T_i-pedestal was observed. Also, it was found that there exists a close correlation and weak relative hysteresis between the pedestal \nabla V_\phi and \nabla T_i during both L → H and H → L transitions. During the L → H transition, the V_\phi-pedestal is observed to form ahead of the T_i-pedestal, and build inward from the separatrix. Linear gyrokinetic stability analysis of these KSTAR profiles was performed. The results indicate that parallel velocity shear is a relevant drive for pedestal turbulence and transport. This was largely ignored in previous studies of the pedestal micro-stability. Pedestal ion temperature and rotation profiles were also measured during edge localized mode (ELM) suppression experiments on KSTAR using an n = 1 RMPs. It was found that the top values of the ion temperature and toroidal rotation pedestal drop with RMPs when ELMs are suppressed.

Dedication:

marshall

To the memory of Professor Marshall N. Rosenbluth - an American plasma physicist and member of the National Academy of Sciences - who passed away on September 23, 2003.

Research:


We are working primarily on the theory of fusion plasma including:

  • Nonlinear dynamics of plasmas and fluids
  • Anomalous transport
  • Self-organized criticality in confined plasma
  • L-H transition, transport barrier physics
  • Dynamo theory
  • Nonlinear waves in space plasma

Funding:

fusion

Our work is primarily funded by the Office of Fusion Energy Sciences of the U.S. Department of Energy.

Grant No. DE-FG02-04ER54738.