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Vincent Roger PIP-II Machine Advisory Committee Meeting 10 April 2017 Design of SC Cryomodules

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Page 1: Charge for the PIP-II Machine Advisory Committee (P2MAC) · The goal of PIP-II is to provide, by the middle of the next decade, 1.2 MW of beam power from the Main Injector for the

Vincent RogerPIP-II Machine Advisory Committee Meeting10 April 2017

Design of SC Cryomodules

Page 2: Charge for the PIP-II Machine Advisory Committee (P2MAC) · The goal of PIP-II is to provide, by the middle of the next decade, 1.2 MW of beam power from the Main Injector for the

05/20/2023

V. Roger | Design of SC Cryomodule2

1. Introduction2. Design strategy3. Cryomodule design - PIP II

1. Definition of the way to support the cavities2. P&I Diagram3. Pipe sizing4. Vibration5. Assembly process

4. Cryomodule status - PIP II5. Summary

Outline

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1. IntroductionIn addition to the HWR cryomodule, 4 SC cryomodules need to be designed at 325 MHz and 650 MHz to complete the Proton Improvement Plan-II (PIP-II) at Fermilab.

V. Roger | Design of SC Cryomodule

SSR1 Cryomodule

SSR2 Cryomodule

LB650 Cryomodule

HB650 Cryomodule

HWR Cryomodule

Page 4: Charge for the PIP-II Machine Advisory Committee (P2MAC) · The goal of PIP-II is to provide, by the middle of the next decade, 1.2 MW of beam power from the Main Injector for the

General parameters of SC cryomodules

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1. Introduction

V. Roger | Design of SC Cryomodule

Cryogenic loads in SC cryomodules for operation in the CW regime

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2. Design strategy

V. Roger | Design of SC Cryomodule

• Define the way to support the string assemblyo Alignmento Tooling

• Design of the string assemblyo Cavity spacingo Length of the cryomodule

• Write down the P&I Diagram of the cryomoduleo Estimation of the heat-loadso 1 or 2 thermal shieldso Exchanger inside or outside the cryomodule

• Calculate the needed diameter for each cryogenic lineso Relief valve calculation and code complianceo Small df/dP

• Design the cold-mass around the string assembly• Design of the vacuum vessel with the interfaces• Design tooling

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3. Cryomodule design - PIP II3.1 Definition of the way to support the cavities

V. Roger | Design of SC Cryomodule

The alignment of the cavities will be done on the strong-back outside the vacuum vessel. To keep the alignment, the strong-back needs to be supported in the exact same way when it will be inside the vessel.

Choice: A strong-back at room temperature supporting the cavities

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3. Cryomodule design - PIP II3.1 Definition of the way to support the cavities

V. Roger | Design of SC Cryomodule

The strong-back at room temperature will support the cold-mass. To validate this strategy, thermal analysis have been in order to be sure that the temperature of the strong-back will not change significantly during the operation.

For SSR1, a strong-back temperature of 285K has been estimated

during the operation.

Page 8: Charge for the PIP-II Machine Advisory Committee (P2MAC) · The goal of PIP-II is to provide, by the middle of the next decade, 1.2 MW of beam power from the Main Injector for the

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8 V. Roger | Design of SC Cryomodule

• The displacement during the cool down need to be estimated.

• The bellows need to be calculated (allowable displacement & forces applied).

• All the assembly process and tooling need to be developed “particle-free”.

3. Cryomodule design - PIP II3.2 Design of string assembly

HB650string assembly

SSR1string assembly

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3. Cryomodule design - PIP II3.3 P&I Diagram

V. Roger | Design of SC Cryomodule

SSR1, SSR2, LB650 and HB650 cryomodules share a similar P&I Diagram according to the number of cavities and solenoids.

• One single thermal shield• An exchanger inside the cryomodule• A 2 phase helium pipe sized in order

to get a small df/dp• A cool-down warm up line sized to

reduce the transition time (resistive / supra)

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3. Cryomodule design - PIP II3.4 Pipe sizing

V. Roger | Design of SC Cryomodule

All the lines meet the requirements according to the pressure relief consideration. The diameter of the two phase helium pipe has been oversized on purpose to order to help during the operation and reduce df/dp.

Pipe sizing - SSR1

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3. Cryomodule design - PIP II3.5 Vibration

V. Roger | Design of SC Cryomodule

Take advantage of LCLS II experience.Helium lines have been design in order to reduce the movement and vibration on the 2 phase helium pipe.

Investigation on LCLS II cryomodule are still on progress in order to reduce vibration and optimize the cryogenic process.

Based on these results some design modifications will be done on the side opening of the PIP II cryomodules.

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3. Cryomodule design - PIP II3.6 Assembly process - SSR1 cryomodule

First the string assembly will be assembled inside the clean-room.Then, the cold-mass starting with the strong-back will be assembled outside.

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The G10 support posts will isolate the strong back at room temperature from the components at cold temperature.

V. Roger | Design of SC Cryomodule

3. Cryomodule design - PIP II3.6 Assembly process - SSR1 cryomodule

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The bottom part of the thermal shield will be set up on the G10 support posts.

V. Roger | Design of SC Cryomodule

3. Cryomodule design - PIP II3.6 Assembly process - SSR1 cryomodule

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The support posts of the cavities and solenoids will be installed on the G10 posts.

V. Roger | Design of SC Cryomodule

3. Cryomodule design - PIP II3.6 Assembly process - SSR1 cryomodule

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With a supporting fixture, the assembly string will be put in place on its posts.

V. Roger | Design of SC Cryomodule

3. Cryomodule design - PIP II3.6 Assembly process - SSR1 cryomodule

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The current leads of the solenoids will be set up.

V. Roger | Design of SC Cryomodule

3. Cryomodule design - PIP II3.6 Assembly process - SSR1 cryomodule

Page 18: Charge for the PIP-II Machine Advisory Committee (P2MAC) · The goal of PIP-II is to provide, by the middle of the next decade, 1.2 MW of beam power from the Main Injector for the

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The two phase helium pipe will be welded on the top of the cavities and solenoids.

3. Cryomodule design - PIP II3.6 Assembly process - SSR1 cryomodule

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Finally the top part of thermal shield with MLI all around will be placed all around the cold-mass.

V. Roger | Design of SC Cryomodule

3. Cryomodule design - PIP II3.6 Assembly process - SSR1 cryomodule

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Then, the cold-mass will be inserted inside the vacuum vessel.For this dedicated tooling will be designed.

V. Roger | Design of SC Cryomodule

3. Cryomodule design - PIP II3.6 Assembly process - SSR1 cryomodule

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The vacuum vessel will be close and side opening will be set up.For this dedicated tooling will be designed.

V. Roger | Design of SC Cryomodule

3. Cryomodule design - PIP II3.6 Assembly process - SSR1 cryomodule

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Cryogenic lines will be welded to the valves, bayonets, exchanger and chimney.

V. Roger | Design of SC Cryomodule

3. Cryomodule design - PIP II3.6 Assembly process - SSR1 cryomodule

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The thermal shield will be set on the top and side openings.

V. Roger | Design of SC Cryomodule

3. Cryomodule design - PIP II3.6 Assembly process - SSR1 cryomodule

Page 24: Charge for the PIP-II Machine Advisory Committee (P2MAC) · The goal of PIP-II is to provide, by the middle of the next decade, 1.2 MW of beam power from the Main Injector for the

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24 V. Roger | Design of SC Cryomodule

3. Cryomodule design - PIP II3.6 Assembly process - SSR1 cryomodule

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4. Cryomodule status - PIP II4.1 SSR1 Cryomodule

V. Roger | Design of SC Cryomodule

4.2 SSR2 Cryomodule

The design of SSR2 Cryomodule didn’t start, but it should be similar to SSR1 cryomodule. CM delivery is expected by 2023.

SSR1 string assembly• Final design: 100% completed• Procurement: 100% completed• Assembly completed by 1st half 2018

SSR1 cryomodule - Top assembly• Conceptual design: completed• Final design: ~90% completed• First CM delivered by 1st half 2019

The cold-mass review is expected by June 2017. Work packages and lead engineers are clearly identified to complete this cryomodule.

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4. Cryomodule status - PIP II4.3 HB650 Cryomodule

V. Roger | Design of SC Cryomodule

The preliminary design is done. The strategy is now, first, to have the review of SSR1 cold-mass before completing HB650 cryomodule.

First CM delivered by 1st half 2021

4.4 LB650 Cryomodule

The design of the LB650 CM will be similar to the HB650 CM. RRCAT is in

charge of the design.First CM delivered by 2nd half 2022

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5. Summary

V. Roger | Design of SC Cryomodule

• A common design strategy has been defined for SSR1, SSR2, LB650 and

HB650 cryomodules.

• The design of the SSR1 Cryomodule is advanced and this experience will

be used to complete the design of the other cryomodules.

• The technical team is formed by engineers, scientists and technicians with

previous experience in SRF. Work packages and lead engineers are clearly

identified.

• To respect the planning of these CM, particular attention need to be taken

considering cavity, tuner, and coupler manufacturing and the availability of

the test station to qualify these elements.


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