1. Cryostat design Mechanical design: Thermal screens: Specifications:
The general design is validated,
Few changes which will be defined before the end of June,
The flatness of the Lambda seat must be better than 0.1mm, the seat must be machined again after welding of the cold vessel.
Thermal screens:
An aluminum design is proposed,
If CD wishes replace the aluminum by copper, this choice must be justified by economic or technical reasons.
Specifications:
Maximum allowable operating pressure:  4 barg,
Hydraulic test pressure: 7.15 bara,
The manufacturing norms must be defined (EN13458 norms ?)

2. Vertical Cryostat : Small changes suggested
T ribs
T ribs
End welding
Thermal shield
Remachined surface after welding (flatness ~0.1mm)

3. Liquid Insert : few changes suggested
re-organise flanges to clear central access
ACS task :
The final version of the mechanical drawings: end of June
Add “many” spares acces
Shield design to copy from CERN: quarter disc folded-sheet + “T”rib
Increase radius~1cm
Add “many” acces holes
Insert will be used for cryogenic commissioning

6. Lambda Insert : several modifications
Mechanical design:
Several modifications must be made to install the magnetic measurement system.
The new design of the top flange is chosen to reduce the mass of the insert.

7. Lambda Insert Magnet is around 5100kG
re-organise flanges to clear central access
(+3 anti-cryostat clearance)
reduce the weight of TopLid (crane 7T)
Add “many” spares acces
Shield design to copy from CERN: quarter disc folded-sheet + “T”rib
(simpler)
Add “many” acces holes
clear central access
(+3 anti-cryostat holes)
Simplify Lambda-plate profile
(as cern)
Add some acces holes:
measurement and heaters
Heat exchanger manufacturing
(SS304+copper)
Magnet is around 5100kG
2 shorter Level Sensors

11. Heat Exchanger HX681 Low pressure circuits specifications:
Operating pressure: 16 mbar (10 mbar to 1 bara),
External maximal pressure: 5 bara,
Operating temperature: 1.8 K (1.6 K to 4.5 K),
Cryogenic power (design): 120 W at 1.8 K,
Inner pipe surface: > 1m².
Low pressure inside the heat exchanger
Atmospheric pressure circuits specifications:
Operating pressure: 1.2 bara,
Maximal pressure: 5 bara,
Operating temperature: 1.85 K (1.6 K to 4.5 K),
Cryogenic power (design): 120 W at 1.85 K.
Manufacturing:
- All pipes can be brazed on the heat exchanger body with a silver alloy,
- Use CuC2 for all components, excepted the flanges SS304L or SS316L.
Atmospheric pressure outside the heat exchanger
Pressurized helium bath
Hydraulic tests:
- External pressure: 6 barg,
- Internal pressure: 6 barg.