Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session PO05: MFE: Diagnostics and Disruptions
2:00 PM–5:00 PM,
Wednesday, October 19, 2022
Room: Ballroom 111 B
Chair: Jeffrey Herfindal, ORNL
Abstract: PO05.00011 : Modelling and validation of cryogenic pellet formation for the ITER DMS Shattered Pellet Injector
4:00 PM–4:12 PM
Presenter:
Sandor Zoletnik
(Centre for Energy Research)
Authors:
Sandor Zoletnik
(Centre for Energy Research)
Miklos Vecsei
(Centre for Energy Research)
Erik Walcz
(Centre for Energy Research)
Tamas Szepesi
(Centre for Energy Research)
Noe Bundschuh
(Centre for Energy Research)
Stefan Jachmich
(ITER Organization)
Uron Kruezi
(ITER Organization)
Michael LEHNEN
(ITER Organization)
The pellets are produced by desublimating the gas in a cryogenically cooled barrel, and launched by a gas pressure pulse. A model has been developed for the desublimation process to predict the required cooling power and pellet formation times. It calculates conduction of heat, resulting from desublimation and gas heating at the pellet surface, to the cold head. The surface temperature and desublimation rate are calculated self-consistently, resulting in nearly two orders of magnitude drop in the desublimation rate as the pellet layer thickens. The modelled pellet formation times are close to the measured values. In the experiments often a light-scattering snow-like layer forms on the pellet surface, allowing launch at much lower propellant gas pressures than expected. The contribution discusses the above processes and prospect of pellet formation in the ITER DMS.
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