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A new pellet extrusion concept for nowadays tokamak plasma control system

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  • Additional Information
    • Contributors:
      Laboratoire de Cryogénie pour la Fusion (LCF); Département des Systèmes Basses Températures (DSBT); Institut de Recherche Interdisciplinaire de Grenoble (IRIG); Direction de Recherche Fondamentale (CEA) (DRF (CEA)); Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)); Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG); Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA); Laboratoire de Calculs et Conception Cryogénique (L3C); European Project: 633053,EURATOM-Adhoc-2014-20,EURATOM-Adhoc-2014-20,EUROfusion(2014)
    • Publication Information:
      CCSD
    • Publication Date:
      2024
    • Collection:
      Université Grenoble Alpes: HAL
    • Subject Terms:
      Dublin; Ireland
    • Abstract:
      International audience ; CEA/DSBT proposes a new pellet production method for plasma fuelling or ELM control systems in nowadays tokamaks. This method is based on CEA/DSBT developments of solid hydrogen ribbon systems for high-energy laser/matter interactions (1).A demonstration test bench was setup at CEA/DSBT and consists of a 250 cm3 extrusion cell filled with solid hydrogen for instance. The cell is pressurized at around 60 bar by precooled hydrogen gas to extrude an ice rod at around 10 K through a Ø2 mm die. The solid throughput is around 350 mm3/s for typically 2 minutes. An optical visualisation system and the outlet pressure measures, in the pumping duct of the extruded rod, characterized the extrusion speed and allows its control. The solid production process uses either protium, deuterium or a mixture of these gases.Numerical simulations were conducted to predict the pressure and temperature conditions at the die level and at the top of the extrusion cell. During the extrusion, the solid hydrogen behaves as a non-Newtonian fluid and exhibits a highly non-linear viscosity. The results of our model and the experimental campaigns will be presented and discussed for future applications.This new pellet source is proposed as an alternative solution to the existing mechanical screw or piston-driven extruders in the current pellet injection systems.These poster and paper present the experimental setup and the results obtained. Acknowledgment: This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 at EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them.(1) “Continuous production of a thin ribbon of solid hydrogen”, S. Garcia et al., : https://doi.org/10.1017/S0263034614000524
    • Relation:
      info:eu-repo/grantAgreement//633053/EU/Implementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium/EUROfusion
    • Online Access:
      https://cea.hal.science/cea-04915662
    • Accession Number:
      edsbas.9B63EA3D