IT & D1 HeII cooling-variants

R. van Weelderen (CERN)

WP3 Meeting(24th of April 2013)

Overview• Variants for placing cryo-equipment considered• Actively cooled parts: ∆T, HX-size as function of

total heat load• Passively cooled parts: Conduction area as

function of heat load per meter• Summary of requirements as function of HeII-

cooling-variant

Variants for placing cryo-equipment considered (1 of 4)

• Phase-separator &• Piping entries/exits

• Phase-separator &• Piping entries/exits• Possible QRL-jumper

• SM &• QRL-jumper

actively cooled passively cooled

Q1,Q2a,Q2b,Q3: actively cooled for about 41 m, double-HXs (80 mm Ø holes) neededCP & D1 : passively cooled for about 16 m, no HXs needed

Variants for placing cryo-equipment considered (2 of 4)

• Phase-separator &• Piping entries/exits

• Phase-separator &• Piping entries/exits• Possible QRL-jumper

• SM &• QRL-jumper

actively cooled passively cooled

Q1,Q2a,Q2b,Q3+CP: actively cooled for about 49 m, double-HXs (80 mm Ø holes) neededD1 : passively cooled for about 8 m, no HXs needed

Variants for placing cryo-equipment considered (3 of 4)

• Phase-separator &• Piping entries/exits

• Phase-separator &• Piping entries/exits• Possible QRL-jumper

• SM &• QRL-jumper• Phase-

separator• Piping

entries/exits

actively cooled passively cooled

Q1,Q2a,Q2b,Q3: actively cooled for about 41 m, double-HXs neededCP : passively cooled for about 8 m, no HXs neededD1 : actively cooled for about 8 m, double-HXs needed

actively cooled

Variants for placing cryo-equipment considered (4 of 4)

• Phase-separator &• Piping entries/exits

• Phase-separator &• Piping entries/exits• Possible QRL-jumper

• SM &• QRL-jumper• Phase-

separator• Piping

entries/exits

actively cooled

Q1,Q2a,Q2b,Q3: actively cooled for about 41 m, double-HXs neededCP,D1 : actively cooled for about 16 m, double-HXs needed

actively cooled

Actively cooled IT-parts

For both variants 1 & 2, we can extract the total IT-CP-D1 heat up to a maximum of 550 W with a ∆T < 100 mK.

Total power extraction limited by :1) # (2)2) size (80 mm

holes)of the HXs

Passively cooled parts

Variant 1: D1+CP conduction area > 300 cm2

Variant 2: D1 conduction area > 130 cm2

Variant 3,4: CP conduction area > ~ 100 cm2 (t.b.c)

Variant 3 and 4 HX comparisonGive the saturation temperature at 1.800 the T of the D1 and CP helium bath is dominated by the available HX-Area and Kapitza resistance of the Cu-surfaces:

2xHXs holes Variant 3 Variant 4

49 mm - 1.925 K

54 mm - 1.910 K

59 mm - 1.900 K

64 mm - 1.889 K

69 mm 1.963 K 1.882 K

74 mm 1.950 K < 1.880 K

79 mm 1.940 K < 1.880 K

‘-’ : means HX overflowing and/or T > 2.0 K, non feasible configurationVariant 3, with HX-holes > 69 mm is critically dependent on the HX-area and variations in

Kapitza resistance of the Cu surfaces risky configurationVariant 4, with HX-holes penetrating D1 and CP is more robust and can do with HX holes

down to 49 mm

Variant 1 Variant 2 Variant 3/4

Power limit (with max HX holes of 80 mm)

550 W (Q1-D1)vapour velocity constraint

550 W (Q1-D1)vapour velocity constraint

550 W (Q1-Q3) +~ 160 W (CP-D1) =710W Area constraint

Q1-Q3 HXsQ1-Q3 Free AreaQ1-Q3 Cryostat Pumping line

2x80 mm holes~ 150 cm2

97-100 mm

2x80 mm holes~ 150 cm2

97-100 mm

2x80 mm holes~ 150 cm2

97-100 mm

CP HXsCP Free AreaCP Cryostat Pumping line

none> 300 cm2

none

2x80 mm holes~ 150 cm2

97-100 mm

None or > 2x49-80 mm holes~ 100 cm2

noneD1 HXsD1 Free AreaD1 Cryostat Pumping line

none> 300 cm2

none

none~ 130 cm2

none

> 2x49-80 mm holes~ 100 cm2

~ X mm

Phase separator& piping entries/exits

1) Q1-end2) Q3-CP

1) Q1-end2) CP-D1

1) Q1-end2) Q3-CP3) CP-D1 or Q3-CP

QRL-jumpers Q3-CPSM

CP-D1SM

Q3-CPSM

Summary1. If Qtotal < 550 W: Variant 2 if 80 mm holes in

CP allowed, if not Variant 3/4

2. If 550 W < Qtotal < 710 W: Variant 3/4, T-D1

will approach 2.0 K, if possible at least 2x49 (preferably 80 mm) mm holes through D1 and CP

3. Qtotal > ~710 W becomes difficult!