PPPL-5376
Numerical Stress Analysis during Cooldown and Compressive Loading
in an Imperfect Nb3Sn Wire
Authors: C.S. Chang, S. Ku, R. Hager, and M. Churchill
Abstract: Transport barrier formation and its relation to
sheared flows in fluids and plasmas are of fundamental interest in
various natural and laboratory observations and of critical
importance in achieving an economical energy production in a
magnetic fusion device. Here we report the first observation of an
edge transport barrier formation event in electrostatic gyrokinetic
simulation carried out in a realistic diverted tokamak edge geometry
under strong forcing by a high rate of heat deposition. The results
show that turbulent Reynolds-stress driven sheared ExB flows act in
concert with neoclassical orbit loss to quench turbulent transport
and form a transport barrier just inside the last closed magnetic
flux surface