PELLET SHATTERING PROCESS FOR THE ITER DISRUPTION MITIGATION SYSTEM - PART I: DEVELOPMENT OF A DISCRETE ELEMENT CODE FOR MODELING THE DYNAMIC FRAGMENTATION OF CRYOGENIC MATERIALS - Signetti, Stefano; Matura, Pascal; Murillo, Jose Luis Sandoval; Durr, Nathanael; Buettner, Markus; Watson, Erkai; Moser, Stefan; Gebhardt, Dilara; Jachmich, Stefan; Lehnen, Michael; Kruezi, Uron (Proceedings Of The 17th Hypervelocity Impact Symposium, Hvis 2024, 2025)