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Cooling Update (25 February 2014)

Cooling Update (25 February 2014). Rob van Weelderen, Cryogenic Group, Technology Department, CERN. Overview. Heat Loads + Explicit Design Margins IT - Bayonet Heat Exchangers Update of Update at next video meeting!. P lacing of cryo -equipment considered (variant 4). a ctively cooled.

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Cooling Update (25 February 2014)

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  1. Cooling Update(25 February 2014) Rob van Weelderen, Cryogenic Group, Technology Department, CERN

  2. Overview Heat Loads + Explicit Design Margins IT - Bayonet Heat Exchangers Update of Update at next video meeting!

  3. Placing of cryo-equipment considered (variant 4) actively cooled actively cooled • Phase-separator & • Piping entries/exits • Phase-separator & • Piping entries/exits • QRL-jumper • SM & • QRL-jumper • Phase-separator • Piping entries/exits Q1,Q2a,Q2b,Q3: actively cooled for about 41 m, double-HXs needed CP,D1 : actively cooled for about 16 m, double-HXs needed

  4. D1 & IT: heat loads Courtesy L. S. ESPOSITO However these loads have to be corrected for the expected 10 % transparency of the Tungsten absorbers material with respect to the Pure Tungsten used for the Fluka calculations + additional loads -

  5. D1 & IT: heat loads Q1-Q2A ~ 260 W, Q2B-Q1B ~ 310 W, D1+CP ~ 195 W, Beam screens ~ 785 W Assuming no electron cloud we have already IT+D1: 764 W Assuming image currents 0.5 W/m on BS (tbc) : 655 W What will be our design choice? Propose + 20 % margin ~ 920 W (686 @IT) at 1.9 K, 785 W at BS

  6. Targeting 686W means: HX inner diameter ~78 mm, Yoke hole ~88 mm

  7. Targeting 686W with split pumping option means: HX inner diameter ~57 mm, Yoke hole ~65 mm

  8. Notes: At 800 W on the Q1-Q3B the split option starts to break down due to vanishing T-regulation margin (but can still “work”) D1 can extract ~250 W with 2x49mm ID HX’s (2x58mm Yoke holes): about 350-400 W with 2x68 ID HX’s (2x77mm Yoke holes). Total IT+CP+D1 heat extraction capacity using split pumping option 1050 W – 1200 W

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