Abstract Details
Abstracts
Author: James Corbett
Requested Type: Poster
Submitted: 2025-03-13 09:14:56
Co-authors: J. CORBETT, R. Samulyak, J. Artola, S. Jachmich, E. Nardon, M. Kong
Contact Info:
Stony Brook University
100 Nicolls Road
Stony Brook, New York 11794
United states
Abstract Text:
Direct numerical simulations of the rocket acceleration of SPI in JET have been performed using PELOTON, a 3D Lagrangian particle pellet code [R. Samulyak et al, Nuclear Fusion 61 (4), 046007 (2021)], and validated using JET experiments. The pellet rocket acceleration is driven by grad-B drift of the ablation cloud that creates asymmetry and non-uniform heating of the cloud. The model accounts for non-uniform charging of the ablation cloud by hot plasma electrons as well as local plasma gradients. As a result, the increased pressure on the HFS compared to the LFS leads to pellet (fragment) rocket acceleration. Pure deuterium and deuterium-neon mixture models have been implemented. The background plasma states have been obtained by using a new plasma cooling model for PELOTON. The cooling model distributes the ablated material within the corresponding flux volumes and accounts for ionization and other energy losses, Ohmic heating by toroidal currents, and the energy exchange between ions and electrons. Plasma profiles predicted by PELOTON’s cooling model have been compared with JOREK and INDEX simulations. PELOTON simulations of rocket acceleration and the corresponding trajectories of deuterium fragments are consistent with experimentally measured trajectories in JET. We also show that composite deuterium-neon pellets containing 0.5% of neon experienced smaller deviation of their trajectories compared to pure deuterium pellets. Future work will focus on the rocket acceleration of SPI in projected ITER plasmas and the development of a reduced order rocket acceleration model.
Characterization: 3.0
Comments: