20th International Spherical Torus Workshop (ISTW2019)

Session

Session 04

04

30 Oct 2019, 09:00

Bruno Brunelli Hall

Conveners

Session 04: Session 04

• Brian Lloyd (UKAEA)

55. NSTX-U: Recent Results and Plans

Stanley Kaye (PPPL)

30/10/2019, 09:00

oral

NSTX-U: Recent Results and Plans
S.M. Kaye
Princeton Plasma Physics Laboratory, Princeton NJ 08543

After an 18-month sequence of key reviews, the NSTX-U Recovery Project was recently approved to initiate procurement and fabrication of components as a step towards completion of the Recovery and commencement of physics operations in the 2021-2022 time frame. The elements of the Recovery,...

29. Validation of gyrokinetic simulations in NSTX including comparisons with a synthetic diagnostic for high-k scattering.

Dr Juan Ruiz Ruiz (1. MIT-Plasma Science and Fusion Center 2. Rudolf Peierls Centre for Theoretical Physics, University of Oxford)

30/10/2019, 09:35

oral

A new extensive validation study performed for a modest beta NSTX NBI-heated H-mode predicts that electron thermal transport can be entirely explained by short-wavelength electron-scale turbulence fluctuations driven by the electron temperature gradient mode (ETG), both in conditions of strong and weak ETG turbulence drive. For the first time, local, nonlinear gyrokinetic simulations carried...

16. 3D HHFW full wave simulations with realistic antenna geometry and SOL plasma in NSTX-U

Nicola Bertelli

30/10/2019, 10:10

oral

In this paper we report an application of the Petra-M on NSTX-U. Petra-M, is a recent developed and open source code, which is based on the scalable MFEM C++ finite element library and allows for FEM analysis from geometry/mesh generation, FEM assembly, FEM system equation solution, and visualization in one platform [1, 2]. The first full torus 3D high harmonic fast wave (HHFW) simulations for...

28. Machine learning approaches to predict the ideal stability properties of spherical tokamak plasmas

Mr A. Piccione (University College London), Mr J.W. Berkery (Columbia University), Mr S.A. Sabbagh (Columbia University)

30/10/2019, 11:15

oral

Machine Learning approaches to predict the ideal stability properties of spherical tokamak plasmas

A.Piccione 1, J.W. Berkery 2, S.A. Sabbagh 2, Y. Andreopoulos 1

1 Department of Electronic and Electrical Engineering, University College London, London, WC1E 7JE, UK

2 Department of Applied Physics and Applied...

51. Transient CHI start-up of low inductance plasma for advanced ST scenarios

Dr Roger Raman

30/10/2019, 11:35

oral

Demonstration of fully solenoid-free start-up at the ~1 MA level and ramp-up to full current of low inductance plasma would be a major step for the ST program, as it would be a convincing enough step for the consideration of ST designs with a reduced size solenoid. In support of this objective, the TSC code, with the inclusion of plasma transport, has been used to study the Transient CHI...

27. Configuration Studies for a Low-Aspect-Ratio Liquid-Metal-Wall Sustained High-Power-Density Tokamak Facility

Dr Jonathan Menard (Princeton Plasma Physics Laboratory)

30/10/2019, 11:55

oral

Utilizing high-Z solid walls such as tungsten is challenging for next-step/Fusion Nuclear Science Facility (FNSF)/Pilot Plant applications due to a range of issues. These issues include Plasma-Facing Component (PFC) material damage from erosion and re-deposition and neutrons, high-Z impurity accumulation and associated core plasma radiative collapse, relatively low heat flux limits at the...