mqxf cold-mass assembly and cryostating h. prin, d. duarte ramos, p. ferracin, p. fessia 4 th joint...

MQXF Cold-mass Assembly and CryostatingH. Prin, D. Duarte Ramos, P. Ferracin, P. Fessia4th Joint HiLumi LHC-LARP Annual Meeting November 17-21, 2014 KEK, Tsukuba

H. Prin, D. Duarte Ramos, P. Ferracin, P. Fessia

Cold mass assembly stepsMagnets reception (visual inspection, mechanical and electrical measurement)Cold mass assemblyMagnets alignment on the dedicated bench

Alignment key installation and welding to the magnet yokeUpper shell positioning

18/11/2014H. Prin, D. Duarte Ramos, P. Ferracin, P. Fessia*MQXFAor MQXFBMQXFAor MCBXFB


Cold mass assembly stepsTack welding the alignment key and the shell to preserve alignment

Rotation by 180 around the longitudinal axis18/11/2014H. Prin, D. Duarte Ramos, P. Ferracin, P. Fessia*


Cold mass assembly stepsTransfer inside assembly cradles

Magnets alignment measurement (at the yoke level)

18/11/2014H. Prin, D. Duarte Ramos, P. Ferracin, P. Fessia*Individual geometrical measurements of straightness in horizontal and vertical planes, twist over full length

Pitch, yaw and roll angle between magnets


Cold mass assembly stepsBus bars installation and connection

Instrumentation wires connection (V-Taps, Quench heaters, cryogenic instrumentation)

Electrical tests (check instrumentation and general wiring) 18/11/2014H. Prin, D. Duarte Ramos, P. Ferracin, P. Fessia*Wires preparationWires routingWires connectionResistive heaterCryo Thermometer


Cold mass assembly stepsCold bore tube installationHeat exchanger tubes insertionUpper shell installation

Electrical tests (final check before welding, very important!)

18/11/2014H. Prin, D. Duarte Ramos, P. Ferracin, P. Fessia*


Cold mass assembly stepsTransfer in the welding press

Longitudinal welding



Cold mass assembly stepsRemoval from the welding pressWelds examination (Visual + X rays)Electrical testsTransfer to finishing benchGeo-magnetic measurements to determine the cold mass main axis

18/11/2014H. Prin, D. Duarte Ramos, P. Ferracin, P. Fessia*Cold mass transfer to the finishing benchTracker in position during measurementsExisting QIMM and DIMM magnetic measurement rotating coil systems


Cold mass assembly stepsWelded cylinder cutting extremities and machining

Support bases alignment and welding

Equipped end covers (flanges and bellows) alignment and welding

Cold bore and heat exchangers alignment and welding to the end covers(Pick-up support alignment and welding if any)18/11/2014H. Prin, D. Duarte Ramos, P. Ferracin, P. Fessia*


Cold mass assembly stepsCold mass geometry measurement

Electrical testsWarm magnetic measurements and polarity checks (if different from step 21.)18/11/2014H. Prin, D. Duarte Ramos, P. Ferracin, P. Fessia*Cold mass finishing benchesGeometric measurement moleLaser tracker


Cold mass assembly stepsCold mass preparation for pressure/leak and cold tests: weld caps on covers apertures

Weld examination (Visual + X rays)

Transfer and connect the cold mass into the pressure test tank

Perform pressure and leak tests

QA documentation18/11/2014H. Prin, D. Duarte Ramos, P. Ferracin, P. Fessia*Preparation for leak/pressure and cold testsInsertion in the pressure/leak test tankLeak detection diagram = f (pressure)


Cryostating stepsOnly the main steps are listedThe list is for the most complex cryostat variant, i.e. with jumper and phase separator, thus including a so-called service moduleIntermediate leak checks and electrical tests will be done at critical steps (to be defined)A pressure test may be required at the end, before shipping to the cold test facilityAssuming an LHC type cryostat with support posts and a bottom tray supported shield. The sequence may end up quite different if we need to implement an alternative cryostat design.



The examples of the IR quad and LHC main dipole18/11/2014H. Prin, D. Duarte Ramos, P. Ferracin, P. Fessia*


Cryostating steps (I)Assembly of 1.9 K auxiliary lines, outside the cold masspumping line, aux. bus-bar lines, quench line, etc.Preparation of instrumentation cablespresent LHC choice is to connect all of them to instrumentation feed-box on top of the cryostatAssembly the cold mass onto the bottom tray and cold supports subassemblyWrapping multi-layer insulation (MLI) around the cold massAssembly of the thermal shield shells and auxiliary 70K lines, if anyWrapping MLI around the thermal shieldsInsertion into the vacuum vesselin this phase only 2 lifting points at the extremitiesFastening the cold supports



Cryostating steps (II)Welding of cryogenic piping and phase separatorsAssembly of the instrumentation feed-through (IFS)Splice brazing and welding of bus-bars bypass and temporary cryo circuits for cold testing (those that may not be done during cold mass assembly)Closing of the service module thermal shield and vacuum vesselAssembly of the jumper to the QRL and the IFS boxFinal tests and preparation for transport to SM18 for cold testingCold testStrippingInterfaces preparation for tunnel installationShielding/beam screen insertion



Appendix18/11/2014H. Prin, D. Duarte Ramos, P. Ferracin, P. Fessia*


Computation of deflectionAssumptionsTotal length: 9.5 mMass/m: 1500 kg/mOD: 630 mmVessel thickness:8, 10 and 12 mmOnly the moment of inertia of the vessel is consideredMinimum deflectionC = 2.12 mMaximum deflectionC = 0 m


TH8 mm10 mm12 mmY min0.20 mm0.16 mm0.14 mmY max9.83 mm7.94 mm6.68 mm


Computation of deflection18/11/2014H. Prin, D. Duarte Ramos, P. Ferracin, P. Fessia*


Cold mass and cryostatOpen issuesWelding on backing strip on aluminum shells

Thickness of stainless steel shell (8 or 10 mm)

Supports of the cold-massConsidered scenario2 (not at the extremities) or 3 supports while inserting the magnet (LHC main dipole scenario)3 support of the cold-mass inside the cryostat2 supports for the cryostat18/11/2014H. Prin, D. Duarte Ramos, P. Ferracin, P. Fessia*


mqxf cold-mass assembly and cryostating h. prin, d. duarte ramos, p. ferracin, p. fessia 4 th joint...

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