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HB650 Cryomodule
Vincent Roger
International workshop on cryomodule design and standardization
6th September 2018
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1. Description of the HB650 cryomodule
2. Assembly process
3. Instrumentation
Layout
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1. Description of the cryomodule
• Vacuum vessel : 9.7 m long and around 1.5 m high compared to the beam axis• Thermal shield at 35-50 K• 5 K line used as thermal intercept & to cool down the cold-mass• 5 Bayonets, 2 cryogenic valves & an heat exchanger• 6 Cavities, tuners & couplers• A cold magnetic shield around each cavity, and warm magnetic shield on the inner
surface of the vacuum vessel (still under discussion)
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1. Description of the cryomodule
• Max Cryomodule height: 2.8 m
• Beamline height from floor: 1.3 m
• Max allowed heat load to 35-50 K: 160 W
• Max allowed heat load to 5 K: 61 W
• Max allowed heat load to 2 K: 50 W
• Transverse cavity alignment error < 0.5 mm
• Angular cavity alignment error < 1 mrad
• Max variation of pressure in the 2-phase helium pipe: 0.1 mbar
1.1 Cryomodule requirements
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1. Description of the cryomodule
• Some analytical calculations have been done to size this vessel.• Relief analysis has been done.• FEA need to be done in order to be sure about the locations of the supports post and
the lifting lugs.• The vacuum vessel is composed of 11 tuner ports which are used also for the
instrumentation.
1.2 Vacuum vessel
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1. Description of the cryomodule
1.3 Layout of the cryomodule
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1. Description of the cryomodule
1.4 Cryogenic lines
Pipe G - 2phase He pipe & Relief lineMAWP: 2.05 bar warm, 4.1 bar cold
Pipe A - 2 K supplyMAWP: 20 bar
Pipe C & D - 5 K lineMAWP: 20 bar
Pipe E & F - 35-50 K lineMAWP: 20 bar
Pipe B - Pumping lineMAWP: 2.05 bar warm, 4.1 bar cold
Pipe H - Cool down /warm up line
MAWP: 20 bar
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Calculations have been done in order to demonstrate that all the pipes of HB650cryomodule have been designed per venting requirements.
Needed diameter for the chimney of the dressed cavity
Needed diameter for the 2-phase helium
pipe
Needed diameter for the relief line
Loss of insulating vacuum
28.8 mm 74.7 mm 75.2 mm
Cavity vacuum loss 40 mm 97.8 mm 97.8 mm
Considereddiameter
93.5 mm 146.8 mm 122.8 mm
The two-phase helium pipe has been oversized in order to increase the gas volumeand therefore the pressure stability.
1.5 Pipe sizing
1. Description of the cryomodule
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2. Assembly process
• Workstation 1: Assembly of the cavity string in the clean room• Workstation 2: Lifting of the string assembly
Welding of the cool-down / warm up lineMoving down the string assembly on the strong-back assembly
• Workstation 3: Assembly of the cold-mass• Workstation 4: Insertion of the cold-mass in the vacuum vessel
Completion of the cryomodule
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2. Assembly process
All the cryogenic lines have been pre-designed based on anassembly process, but the design stage is not over yet. Simulations,and several parts need to be designed including the beam line.
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2. Assembly process
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2. Assembly process
35-50 K line will be leak tested and pressure tested by the manufacturer.
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2. Assembly process
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2. Assembly process
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2. Assembly process
Under the lifting tooling:• The tuner will be set up on each cavity.• The cool down line will be welded to the cavities• MLI will be set on each cavity and on the cryogenic lines.• A magnetic shield around each cavity will be set up.
Design pressure of the cool down line : 20 barg.Design pressure of the weld making the connection with the dressed cavities: 2.05 barg at warm, 4.1 barg at cold .
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2. Assembly process
Same fixtures as LCLS II to align the cavities.
Rough alignment of the cavities
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2. Assembly process
Weldment of the 5 K line and leak tests
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2. Assembly process
Set up of the pumping line, and the 2 K lines connected to the heat exchanger
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2. Assembly process
Inlet of the helium in the 2 phase helium pipe
Weldment of the two phase helium pipe and leak tests
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2. Assembly process
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2. Assembly process
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2. Assembly process
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2. Assembly process
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2. Assembly process
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2. Assembly process
Final pressure test of the 35-50 K line.
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2. Assembly process
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2. Assembly process
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2. Assembly process
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2. Assembly process
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2. Assembly process
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2. Assembly process
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2. Assembly process
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2. Assembly process
Radiographic tests of the weld between the CD line & the CD valve.Final pressure test of the 5 K line.Leak test 2 K line and pumping line.
The CD and JT valves have a similar design as LCLS II project to avoid
thermal acoustic oscillations
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2. Assembly process
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2. Assembly process
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2. Assembly process
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2. Assembly process
Final pressure test of the 2 K line, the pumping line and the dressed cavities.
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2. Assembly process
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2. Assembly process
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2. Assembly process
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2. Assembly process
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2. Assembly process
Leak test of the vacuum vessel.
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3. Instrumentation
In the interface document all the external interfaces of SSR1 Cryomodule havebeen mapped out, how it interfaces with the connected systems of PIP-II and thePIP-II Injector Test (formerly known as PXIE).
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3. Instrumentation
• The instrumentation will be very similar to what has been done on SSR1 cryomodule.• Having two ports for each tuner it is possible to split the instrumentation in order to
have more room to do these connections.• On the top of the cryomodule, two pressure transducers will read the pressure inside
the two-phase helium pipe.
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