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Open AccessArticle10.1016/j.phpro.2015.06.010

Experimental and Numerical Investigations for the Operation of Large Scale Helium Supercritical Loops Subjected to Pulsed Heat Loads in Tokamaks

C. Hoa,B. Lagier,B. Rousset,F. Michel,Pascal Roussel-2015-01-01-Physics Procedia
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TL;DRAbstract

Strategies for smoothing pulsed heat loads are of great interest for future operation of large refrigeration systems for tokamaks, such as JT-60SA or ITER as their superconducting magnets are cooled by independent supercritical helium loops. Numerical and experimental process studies have been conducted at CEA Grenoble to validate and optimize the control of such large scale refrigeration circuits. At the cryo-distribution level, in the auxiliary cold box, pulsed heat load effects have been analysed on a scaled down loop of supercritical helium driven by a cold circulator. Variation of pressure and mass flow can be significant depending on the pulsed load scenario and on the volume distribution between the heat sources and extractions along the loops. Extensive experimental tests have been performed on the HELIOS (HElium Loop for hIghlOads Smoothing) test facility during the past three years and the present article aims at summarizing the pulsed load strategies and the understanding of

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Strategies for smoothing pulsed heat loads are of great interest for future operation of large refrigeration systems for tokamaks, such as JT-60SA or ITER as their superconducting magnets are cooled by independent supercritical helium loops. Numerical and experimental process studies have been conducted at CEA Grenoble to validate and optimize the control of such large scale refrigeration circuits. At the cryo-distribution level, in the auxiliary cold box, pulsed heat load effects have been analysed on a scaled down loop of supercritical helium driven by a cold circulator. Variation of pressure and mass flow can be significant depending on the pulsed load scenario and on the volume distribution between the heat sources and extractions along the loops. Extensive experimental tests have been performed on the HELIOS (HElium Loop for hIghlOads Smoothing) test facility during the past three years and the present article aims at summarizing the pulsed load strategies and the understanding of

Keywords

Nuclear engineeringTokamakSupercritical fluidHeliumMaterials scienceSuperconducting magnetRefrigerationMass flow

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