Dynamic modelling of local fuel inventory and desorption in the whole tokamak vacuum vessel for auto-consistent plasma-wall interaction simulations

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http://hdl.handle.net/10138/312021

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JET Contributors , Mlynar , J , Ahlgren , T , Aho-Mantila , L , Airila , M , Björkas , C , Lahtinen , A , Nordlund , K , Safi , E , Sipila , S K , Asunta , O , Groth , M , Hakola , A , Karhunen , J , Koivuranta , S , Kurki-Suonio , T , Lomanowski , B , Lonnroth , J , Salmi , A , Santala , M I K , Varje , J , Siren , P , Likonen , J , Jarvinen , A & Denis , J 2019 , ' Dynamic modelling of local fuel inventory and desorption in the whole tokamak vacuum vessel for auto-consistent plasma-wall interaction simulations ' , Nuclear Materials and Energy , vol. 19 , pp. 550-557 . https://doi.org/10.1016/j.nme.2019.03.019

Title: Dynamic modelling of local fuel inventory and desorption in the whole tokamak vacuum vessel for auto-consistent plasma-wall interaction simulations
Author: JET Contributors; Mlynar, Jan; Ahlgren, T.; Aho-Mantila, L.; Airila, M.; Björkas, C.; Lahtinen, A.; Nordlund, K.; Safi, E.; Sipila, S. K.; Asunta, O.; Groth, M.; Hakola, A.; Karhunen, J.; Koivuranta, S.; Kurki-Suonio, T.; Lomanowski, B.; Lonnroth, J.; Salmi, A.; Santala, M. I. K.; Varje, J.; Siren, P.; Likonen, J.; Jarvinen, A.; Denis, J.
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Materials Physics
University of Helsinki, Materials Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2019-05
Language: eng
Number of pages: 8
Belongs to series: Nuclear Materials and Energy
ISSN: 2352-1791
URI: http://hdl.handle.net/10138/312021
Abstract: An extension of the SolEdge2D-EIRENE code package, named D-WEE, has been developed to add the dynamics of thermal desorption of hydrogen isotopes from the surface of plasma facing materials. To achieve this purpose, D-WEE models hydrogen isotopes implantation, transport and retention in those materials. Before launching autoconsistent simulation (with feedback of D-WEE on SolEdge2D-EIRENE), D-WEE has to be initialised to ensure a realistic wall behaviour in terms of dynamics (pumping or fuelling areas) and fuel content. A methodology based on modelling is introduced to perform such initialisation. A synthetic plasma pulse is built from consecutive SolEdge2D-EIRENE simulations. This synthetic pulse is used as a plasma background for the D-WEE module. A sequence of plasma pulses is simulated with D-WEE to model a tokamak operation. This simulation enables to extract at a desired time during a pulse the local fuel inventory and the local desorption flux density which could be used as initial condition for coupled plasma-wall simulations. To assess the relevance of the dynamic retention behaviour obtained in the simulation, a confrontation to post-pulse experimental pressure measurement is performed. Such confrontation reveals a qualitative agreement between the temporal pressure drop obtained in the simulation and the one observed experimentally. The simulated dynamic retention during the consecutive pulses is also studied.
Subject: 114 Physical sciences
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