PTRANSP Simulations of Toroidal Momentum Transport using GLF23 and Weiland Models A. Kritz, F. D. Halpern, C. Wolfe, G. Bateman, A. Pankin Department of Physics, Lehigh University, Bethlehem, PA R. Budny, D. McCune Princeton Plasma Physics Laboratory, Princeton, NJ ITPA May 2007
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PTRANSP Simulations of Toroidal Momentum Transport using GLF23 and Weiland Models
PTRANSP Simulations of Toroidal Momentum Transport using GLF23 and Weiland Models. A. Kritz, F. D. Halpern, C. Wolfe, G. Bateman, A. Pankin Department of Physics, Lehigh University, Bethlehem, PA R. Budny, D. McCune Princeton Plasma Physics Laboratory, Princeton, NJ ITPA May 2007. - PowerPoint PPT Presentation
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PTRANSP Simulations of Toroidal Momentum Transport
using GLF23 and Weiland Models
A. Kritz, F. D. Halpern, C. Wolfe, G. Bateman, A. Pankin
Department of Physics, Lehigh University, Bethlehem, PA
R. Budny, D. McCunePrinceton Plasma Physics Laboratory, Princeton, NJ
ITPA May 2007
ITPA Toroidal Momentum Transport May 8, 2007
Motivation• Momentum transport leads to
– Formation of rotation and velocity shear
– Formation of transport barriers (ITBs)
– Transition to H mode
– Suppression of resistive wall modes
• Momentum transport is less completely studied than anomalous thermal and particle transport
• Toroidal momentum transport model needed in description of the formation of internal and edge transport barriers
• Models for toroidal momentum transport are provided in the GLF23 and Weiland 19 transport models
– In many previous integrated simulations of tokamak discharges, these models were not employed
• A goal of this study is to test and to compare the predictions of these models with experimental data
ITPA Toroidal Momentum Transport May 8, 2007
Simulations of Toroidal Momentum Transport• Predictive PTRANSP simulations of turbulence driven
toroidal momentum transport carried out for 8 discharges
– NBI heated, H-mode JET discharges
• NUBEAM Monte Carlo code used to compute neutral beam injection heating profiles and torque sources
• Toroidal momentum, thermal transport computed using GLF23 or Weiland 19 models and neoclassical transport
– H-mode pedestal width and height computed - PEDESTAL module
– Edge toroidal rotation frequency is obtained from experiment
– Predictive particle transport to be installed in the PTRANSP code
• Sawtooth oscillations carried out using experimental times
– KDSAW module is used with complete magnetic reconnection
• Predicted H-mode toroidal velocity and temperature profiles in quasi-steady state discharges and data compared
ITPA Toroidal Momentum Transport May 8, 2007
New Weiland 19 Model Installed in PTRANSP• The Weiland 19 model is latest version of the extended drift wave
model (EDWM) developed at Chalmers University
• Model can be used to compute electron and ion thermal transport, particle transport, and momentum transport
• Physics improvements over previous versions of the model
– Momentum transport
– Improved finite beta effects
– Low and negative magnetic shear effects
– Varying correlation lengths
– Improved particle pinch effects
• Weiland 19 model implemented in the PTRANSP code
• Information about the model available in
– J. Weiland et al., P2.186, Proceedings of the 33rd EPS Conference 2006