ITER-IA 3D MHD Simulations of Shattered Pellet Injection(SPI)- D1.1 Optimization of the SPI model

This report is in partial fulfillment of deliverable D1.1 Optimization of the SPI model and summarizes axisymmetric ITER SPI parameter scans performed by the NIMROD code for several ITER equilibria. These axisymmetric parameter scans are to assess the sensitivity of various injection parameters in preparation for 3D MHD SPI simulations. The scans are comprised of 5 scenarios: S1 - fragment size scan : 3 uniform pencil beam, 1 distributed size pencil beam S2 - velocity scan : v = [250,500,750]m/s S3 - velocity dispersion scan : dv/v = [0.2,0.4] (linear distribution) S4 - poloidal extent of plume : [15' ,45' ] (linear distribution) (dv/v=0.2) S5 - poloidal injection angle : +/-[20' ,45' ] (dv/v=0.2) These scans are performed with several ITER equilibria representative of the operating range, from low current and thermal energy (H123 5MA, 29MJ Hydrogen H-mode) to high current and high thermal energy (DT24 15MA, 370MJ D-T H-mode).