28 June 2021 – 02 July 2021 Contact: [email protected] Commissariat à l’énergie atomique et aux énergies alternatives THTTEV006 DESIGN OF THE PIP-II 650 MHZ LOW BETA CRYOMODULE N. Bazin † , R. Cubizolles, S. Berry, M. Lacroix, G. Maitre, S. Bouaziz, C. Simon and O. Napoly Université Paris-Saclay, CEA, 91191 Gif-sur-Yvette, France V. Roger, Y. Orlov and S. Chandrasekaran Fermilab, Batavia, IL 60510, USA CEA Contribution to PIP-II: the LB650 cryomodule Design of the LB650 cryomodule Licensing of the LB650 cryomodules System acceptance reviews Procurement of cryomodule components: For 1 pre-production cryomodule + 9 series cryomodules Some components provided by Fermilab: cavities and tuning systems, power couplers, instrumentation (sensors, actuators, cables and feedthroughs), cryogenic valves, heat exchangers, bayonets, helium guards Assembly of all the LB650 cryomodules RF tests of all the LB650 cryomodules (including cryogenics and RF equipment) Design of the LB650 transport frame with the manufacturing of two units, and road tests Disassembly of warm couplers and top port and preparation for shipment of the LB650 cryomodules Design of the LB650 cryomodule Most of the PIP-II cryomodules have the same design concept: the cavity string is supported by the strongback that stays at room temperature . There one configuration for the single spoke cryomodules and an other one for the elliptical cryomodules (LB650 and HB650). LB650 & HB650 cryomodules: Similar cavity design: β = 0.61 for LB650 cryomodule and β = 0.92 for HB650 cryomodule Same power coupler Similar frequency tuning system Similar configuration: 4 cavities for LB650 cryomodule, 6 cavities for HB650 cryomodule Smilar layout for the cryogenic circuits Design strategy for the LB650 cryomodule: benefits from the design, assembly and test of the HB650 prototype cryomodule that comes two years earlier than the LB650 pre-production cryomodule Maximum reuse of components from the HB650 cryomodule: support assemblies of the cavities, heat exchanger, bayonets, cold-warm transition, bellows between cavities, thermal straps, instrumentation Design Strategy Close collaboration between FNAL and CEA design teams Layout of the LB650 cryomodule Each cavity is supported by two posts that are connected to the strongback Cavity attached to the two posts thanks to 4 C clamp assemblies The C clamp close to the power coupler fixes the position of the cavity and the three others allow motion in the horizontal plane due to thermal shrinkage during cool down The alignment of the cavity string is done before the insertion of the cold mass inside the vacuum vessel The strongback stays at room temperature, so the position of each cavity is fixed and the displacement is controlled and monitored using optical devices (HBCAM) to respect the alignment requirements Strongback principle Conclusion of the thermal analysis of the strongback: in order to keep the its temperature close to room temperature, it is mandatory to have high emissivity of both the bottom surface of the strongback and the inner surface of the vacuum vessel, as the radiation from the vacuum vessel is the main source of heat on the strongback the magnetic shield shall not be installed between the vessel and the strongback Vacuum vessel Made of carbon steel, flanges made of stainless steel Design to limit the deformations of the strongback interfaces Maximum deformation: 1.2 mm Thermal shield Shield made of aluminum 1100 Thermo-mechanical studies to assess the gradient, the deformations and the stress during cool down
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28 June 2021 – 02 July 2021
Contact: [email protected] à l’énergie atomique et aux énergies alternatives THTTEV006
DESIGN OF THE PIP-II 650 MHZ LOW BETA CRYOMODULE
N. Bazin†, R. Cubizolles, S. Berry, M. Lacroix, G. Maitre, S. Bouaziz, C. Simon and O. Napoly
Université Paris-Saclay, CEA, 91191 Gif-sur-Yvette, France
V. Roger, Y. Orlov and S. Chandrasekaran
Fermilab, Batavia, IL 60510, USA
CEA Contribution to PIP-II: the LB650 cryomoduleDesign of the LB650 cryomodule
Licensing of the LB650 cryomodules
System acceptance reviews
Procurement of cryomodule components:
For 1 pre-production cryomodule + 9 series cryomodules
Some components provided by Fermilab: cavities and tuning systems, power couplers, instrumentation (sensors, actuators, cables andfeedthroughs), cryogenic valves, heat exchangers, bayonets, helium guards
Assembly of all the LB650 cryomodules
RF tests of all the LB650 cryomodules (including cryogenics and RF equipment)
Design of the LB650 transport frame with the manufacturing of two units, and road tests
Disassembly of warm couplers and top port and preparation for shipment of the LB650 cryomodules
Design of the LB650 cryomodule
Most of the PIP-II cryomodules have the same design concept: the cavity string is supported by the strongback that stays at roomtemperature . There one configuration for the single spoke cryomodules and an other one for the elliptical cryomodules (LB650 and HB650).
LB650 & HB650 cryomodules:Similar cavity design: β = 0.61 for LB650 cryomodule and β = 0.92 for HB650 cryomoduleSame power couplerSimilar frequency tuning systemSimilar configuration: 4 cavities for LB650 cryomodule, 6 cavities for HB650 cryomoduleSmilar layout for the cryogenic circuits
Design strategy for the LB650 cryomodule: benefits from the design, assembly and test of the HB650 prototype cryomodule that comes twoyears earlier than the LB650 pre-production cryomodule
Maximum reuse of components from the HB650 cryomodule: support assemblies of the cavities, heat exchanger, bayonets, cold-warmtransition, bellows between cavities, thermal straps, instrumentation
Design Strategy
Close collaboration between FNAL and CEA design teams
Layout of the LB650 cryomodule
Each cavity is supported by two posts that are connected to the strongback
Cavity attached to the two posts thanks to 4 C clamp assemblies
The C clamp close to the power coupler fixes the position of the cavity and thethree others allow motion in the horizontal plane due to thermal shrinkage duringcool down
The alignment of the cavity string is done before the insertion of the cold massinside the vacuum vessel
The strongback stays at room temperature, so the position of each cavity is fixedand the displacement is controlled and monitored using optical devices (HBCAM)to respect the alignment requirements
Strongback principle
Conclusion of the thermal analysis of the strongback: in order to keep the itstemperature close to room temperature, it is mandatory to have high emissivity ofboth the bottom surface of the strongback and the inner surface of the vacuumvessel, as the radiation from the vacuum vessel is the main source of heat on thestrongback the magnetic shield shall not be installed between the vessel andthe strongback
Vacuum vessel
Made of carbon steel, flangesmade of stainless steel
Design to limit the deformationsof the strongback interfaces
Maximum deformation: 1.2 mm
Thermal shield
Shield made of aluminum 1100
Thermo-mechanical studies to assess the gradient, the deformations and thestress during cool down
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