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Hi-Lumi WP3 meeting

CryostatsSome ideas for the new Q1 to Q3

October 22, 2013

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MQXFMQXFMCBXDMQXFLMQXFLMCBXDMQXFMQXFMCBXCMCQSX3a2

MCTX3

b6MCTSX3a6

MCDX3b5

MCDSX3a5

MCOX3b4

MCOSX3a4

MCSX3b3

MCSSX3a3

MBXF

Baseline assumptions

No jumper on IP-side Return lines inside the magnet’s cryostat (1.9 K pumping,

shield, quench/cooldown,…) Cold mass diameter: 630 mm Sliding sleeve with flanges for access to interconnect Cryostat on motorised jacks (must be of new design), no tie-

rods, similar alignment stability requirements as now First ideas without busbars routing/interconnection (must be

addressed soon)

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Current cryostat cross sectionHeat

exchanger

Pumping lineQuench line

Thermal shield cooling

“Spider” support

Cold mass

OD 1055

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Pipe specifications (preliminary)

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Cryo spec* Possible standard dimensions MaterialOD thickness ID

HeII in (Y1) 12 copperHeII in (Y2) 12 copperHeII out (pumping line) 97 106 3 100 1.4432, weldedBS in (C') 20 23 1.5 20 1.4404, seamlessBS capillaries (4x) 6.5Quench return line 40 44.5 2 40.5 1.4404, seamlessShield in (E ) 30 35 2.5 30Shield out (F) 30 35 2.5 30Bayonet HX-1 68 copperBayonet HX-2 68 copper*by Rob Van Weelderen

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He II out (pumping line)

Quench return

Shield cooling (inlet + outlet)

Beamscreen inlet (C’)

Cold mass

Clearance for orbital welding machines

Standard diameter & centered cold mass

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Standard diameter & downward offset cold mass

Support post not feasible, suspended system not promising

Very tight piping integration

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Standard diameter & upward offset cold mass

Short support post → higher heat load

Difficult piping integration (if at all possible), also at the phase separator region

Complicated cryostating work

No margin from the start!...

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Increased diameter & centered cold mass

Maximum transport width in the tunnel is 1250 mm, simulation needed (C. Bertone)

Simplest cryostat shape

Short support post → higher heat load

Piping integration ok!

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Standard support post

Piping integration ok

Complication of phase separator to pumping line connection (pumping must be above phase separator)

Incerased diameter & upward offset cold mass

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Elliptical cryostat

Simplified piping integration

Standard transport width

Standard support post

Interconnect sleeve is the main challenge (in contact with industry)

Cold mass can be centered

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Integration in the tunnel: large cylindrical vs elliptical On integration CAD models both cylindrical and elliptical versions seam ok (C.

Collazos) . Elliptical has the advantage of easier access for personnel on the sides.

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Conclusion

Large cold mass and size of the pumping line → a standard 1055 diam. cryostat is most likely not possible

Enlarged cylindrical cryostat complicates transport, integration and access in the tunnel: Integration and transport simulation studies required

Elliptical cryostat complicates the interconnect sleeve: contacts on-going with industry to address design/fabrication issues

Busbar rounting and interconnection study should start as soon as possible

Cryogenics P&ID needed to proceed with the conceptual study of the various cryostats

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