1 st Oktober 2014 Rob van Weelderen Gennaro Bozza Cryogenic Group Technology Department CERN Overview Fluka Heat Loads Explicit Design Margins Beamscreen cooling cryogenic parameters ID: 1041428
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1. Beam Screens Cooling Update(1st Oktober 2014)Rob van Weelderen, Gennaro BozzaCryogenic Group, Technology Department, CERN
2. OverviewFluka Heat Loads + Explicit Design MarginsBeam-screen cooling cryogenic parametersCapillary sizing as function of design heat loadSummary beam-screen cooling
3. D1 & IT: Fluka Beam screen heat loads+ explicit design marginsDesign for Total@7.5 x 1034 cm-2s-1: 975 W at beam-screen1) From F. Cerutti, WP3-meeting 22 May 2014, @5 x 1034 cm-2s-1:“At 5L0 550 W on the beam screen of the IT-D1 ” ↓2) Design with 50 % margin (7.5 x 1034 cm-2s-1) on secondary's 550 W x 1.5 = 825 W on beam screen ↓3) Provision for 150 W electron cloud4) Image current load considered marginal
4. Cryogenic beam-screen cooling choicesFor high heat loads the optimum functioning has been identified to lie in the 40 K – 60 K temperature range when cooled by helium†Work with highest practical operating pressure (18 bar – 19 bar), so that helium density is highest, and thus capillaries have smallest possible diameter4 parallel capillaries are deemed the maximum for practical integration (screen & interconnects)The Q1 beam-screen capillaries are assumed to be large due to the especially massive tungsten absorbers on this beam-screen: 16 mm OD, 0.8 mm wall thicknessHeat load: 17.1 W/m (corresponding to 975 W over 57 m)†“Cryogenic Beam Screens for High-Energy Particle Accelerators”, Baglin, V (CERN) ; Lebrun, P (CERN) ; Tavian, L (CERN) ; van Weelderen, R (CERN), 24th International Cryogenic Engineering Conference - International Cryogenic Materials Conference 2012, Fukuoka, Japan, 14 - 18 May 2012
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6. Summary beam-screen coolingDesign heat load 17.1 W/m (@7.5 x 1034 cm-2s-1 , 975 W total over Q1 to D1)Q1: 4 x 16 mm OD, 0.8 mm wall thickness cooling capillariesQ2-D1: 4 x 8.5 MM OD, 0.8 mm wall thickness cooling capillaries20 bar (absolute) design pressure18 bar – 19 bar (absolute) operating pressure40 K -60 K operating temperatureThe capillaries extend all the way from Q1 to D1 and traverse all cold masses and interconnectsN.B. 0.8 mm wall thickness needs to be verified with respect to design pressure