35 citations · 55 across the 8 of their papers we have counts for
9 papers
A Unified theory of transport barriers (TBs) in magnetically confined systems
Swadesh M. Mahajan, David R. Hatch, Zensho Yoshida +1
A thermodynamic model of a plasma boundary layer, characterized by enhanced temperature contrasts is proposed. The theory is constructed to determine the inner boundary temperature…
Microtearing Thresholds and Second-Stable Ballooning in the DIII-D Pedestal: Reduced Modeling and Core-Edge Implications
David R. Hatch, Leonhard A. Leppin, Mike T. Kotschenreuther +4
Global and local linear gyrokinetic simulations of 42 pedestal equilibria from three DIII-D discharges are used to investigate pedestal stability and its impact on pedestal structu…
Gyrokinetic Simulations of a Low Recycling Scrape-off Layer without a Lithium Target
Akash Shukla, Jonathan Roeltgen, Michael Kotschenreuther +7
Low-recycling regimes are appealing because they entail a high edge temperature and low edge density which are good for core confinement. However, due to considerably enhanced heat…
Direct Comparison of Gyrokinetic and Fluid Scrape-Off Layer Simulations
A. Shukla, J. Roeltgen, M. Kotschenreuther +7
Typically, fluid simulations are used for tokamak divertor design. However, fluid models are only valid if the SOL is highly collisional, an assumption that is valid in many presen…
The effect of separatrix density and PFC material on H-mode confinement in the ITPA global H-mode database
M. Kotschenreuther, X. Liu, D. R. Hatch +1
Recent data, added to the ITPA global H-mode database [1] for ASDEX-U [2] and JET-ILW, reveals that the separatrix density has a correlation with the H20 factor (Confinem…
Transport Barriers in Magnetized Plasmas -- General Theory with Dynamical Constraints
Mike Kotschenreuther, Xing Liu, Swadesh M. Mahajan +2
A fundamental dynamical constraint -- that fluctuation induced charge-weighted particle flux must vanish -- can prevent instabilities from accessing the free energy in the strong g…
The free energy balance equation applied to gyrokinetic instabilities, the effect of the charge flux constraint, and application to simplified kinetic models
M. Kotschenreuther, X. Liu, S. M. Mahajan +1
The free energy balance equation for gyrokinetic fluctuations is derived and applied to instabilities. An additional term due to electromagnetic sources is included. This can provi…
Reduced models for ETG transport in the pedestal
David R. Hatch, Craig Michoski, Dongyang Kuang +10
This paper reports on the development of reduced models for electron temperature gradient (ETG) driven transport in the pedestal. Model development is enabled by a set of 61 nonlin…
Flow Shear Suppression of Pedestal Turbulence--A First Principles Theoretical Framework
D. R. Hatch, R. D. Hazeltine, M. K. Kotschenreuther +1
A combined analytic and computational gyrokinetic approach is developed to address the question of the scaling of pedestal turbulent transport with arbitrary levels of …