Simulations of Energetic Particle Modes In Spherical Torus G.Y. Fu, J. Breslau, J. Chen, E. Fredrickson, S. Jardin, W. Park Princeton Plasma Physics Laboratory.

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Simulations of Energetic Particle Modes In Spherical Torus G.Y. Fu, J. Breslau, J. Chen, E. Fredrickson, S. Jardin, W. Park Princeton Plasma Physics Laboratory H.R. Strauss -- New York University L.E. Sugiyama -- MIT NSTX Physics Meeting, Princeton, NJ, Dec. 2, 2002

Outline Introduction M3D Particle/MHD Hybrid Model Beta-induced Alfven Eigenmode in STs NBI-driven TAEs in NSTX Summary

Introduction Recent NSTX experimental observations show rich beam-driven instabilities: fishbone, TAEs, CAE/GAE etc and associated hot particle losses. Alfven modes in STs are less understood as compared to those in conventional tokamaks. Need to study possible new features of beam- driven Alfven modes associated with ST’s unique parameter regime: low aspect ratio, high beta, large energetic ion speed and gyroradius. In this work we investigate stability and nonlinear dynamics of beam-driven Alfven modes (TAE/EPM) via hybrid simulations using M3D code.

M3D Code M3D is an extended MHD code which has multi- level of physics: resistive MHD, two fluids, particle/MHD hybrid etc. 3D and nonlinear. unstructured mesh in poloidal planes and finite difference in toroidal direction. Valid for 3D stellarator geometry. massive parallel with MPI.

Particle/MHD Hybrid Model

Beta-induced Alfven Eigenmode in STs It is known that fluid compression results in a beta-induced continuum gap below the usual toroidicity-induced gaps in shear Alfven continuum in a tokamak. We investigate the finite beta effects on fast ion-driven Alfven eigenmodes in STs. It is found that a TAE is excited at low plasma beta and an low-frequency EPM is excited at a high beta. This EPM can be called beta-induced Alfven eigenmode (BAE) since its frequency is inside the beta-induced continuum gap.

Parameters and Profiles for BAE in STs

q profile

Example of Unstructured Mesh

Transition from TAE to BAE at High Beta

NBI-driven TAEs in NSTX In the NBI-heated NSTX plasmas, beam-driven modes were observed with mode number n=1~5 and frequencies similar to TAE’s. The M3D code is used to simulate these modes for experimental parameters. Unstable TAEs are excited in the simulations with frequencies similar to the observed values. Initial nonlinear simulations indicate n=2 TAE mode frequency chirps down and the mode moves out radially.

The bursting modes are in the TAE frequency range (NSTX) Multiple modes burst at the same time. Toroidal mode number, n, ranges from with the dominant mode being n=2 or 3. Mode frequencies in reasonable agreement with expected TAE frequencies. E. Fredrickson

The final mode growth and decay is very fast Some of the mode amplitude modulation represents "beating" of the multiple modes. Mode growth and decay times are approximately  s. E. Fredrickson

NSTX Parameters and Profiles NSTX shot # at t=0.267sec: R=87cm, a=63cm, B=0.43T, n e (0)=2.5e13, Ti=1.7kev, Te=1.4kev; q(0)=1.82, q(a)=12.9, weakly reversed;  (0)=21%,  beam (0)=13%; v beam /v Alfven = 2.1,  beam /a =0.17

q profile

Pressure Profiles: P thermal and P beam

N=1, 2 & 3 Modes in NSTX

N=4 mode

Simulations show unstable TAEs with mode frequencies consistent with observations n f_simu (kHz) f_exp

Nonlinear Evolution of n=2 TAE: Mode Saturation and Frequency Chirping

Mode Moving Out After Saturation

Summary We have carried out first simulations of beam ion- driven Alfven modes in NBI-heated NSTX plasmas using extended MHD code M3D. The calculated TAE frequencies are consistent with experimental observations. Initial nonlinear simulations show the n=2 TAE mode frequency chirps down at saturation and the mode moves out radially.