1 Cryostat assembly, integration and commissioning procedures M.Olcese Version: 07 May 2008

2 Definitions Flanges/plates (from innermost): –MC plate: mixing chamber plate –HEX plate: heat exchanger plate –STILL plate –4K flange: Inner Vacuum Chamber (IVC) plate –40K plate –300K flange: Outer Vacuum Chamber (OVC) plate Vessels/screens: –MC screen (upper and lower part) –HEX screen –4K vessel: IVC vessel –40K screen –300K vessel: OVC vessel

3 Schematic: cryostat Main external shielding 300K, 4K vessels and 40K screen 300K, 4K flanges and 40K plate Lateral STILL lead shield Internal screens (STILL-HEX-MC) Lateral STILL lead shield support cradle Detector Detector support plate Internal top lead shield STILL plate STILL top lead ring HEX and MC plates

4 Main platform (lower) 1° floor Main platform (upper) 2° floor Light platform Corridor side Parking Side of main shielding Concrete walls Main rail system Aux. rail system Schematic: building and platform

5 Scenarios 1.Initial installation: 1.1 Installation of 300k-40k-4k plates 1.2 Dry fit of vessels and screens 1.3 Installation of STILL-HEX-MC plates 2.Cryostat commissioning 3.Detector installation 4.Access for maintenance

6 General issues All the individual items (with few exceptions) can be brought on the main platform for the installation: –from the hut ground floor with the platform in the side position –Directly from the external corridor using an auxiliary rail system

7 1 Initial installation 1.1 installation of top plates/flanges The plates are delivered clean and inside plastic bags The plates are piled up on the main platform (a platform add-on may be required to reach the 1° floor level) The main platform is raised Eye bolts + radial extensions (if needed) will be fixed to the plates. The plates are lifted by means of the hoist cable system and connected to the tie rods/suspensions It may be convenient to install, along with the plates, some of the internal components like: sections of the source tube, wire feed-throughs, IVC pumping tube, …

8 Main platform Platform extension Option 1 Stack of plates in reverse order (4K-40K-300K) Initial installation 1.1: setting of plates on platform at ground level

9 Option 2 Plates set on auxiliary platform from the corridor side Initial installation 1.1: setting of plates on platform at ground level

10 Initial installation 1.1: platform with plates ready for lifting

11 Initial installation 1.1: platform reach the 1° floor level

12 Initial installation 1.1: 300K-4K flanges and 4K plate are installed in sequence

13 Initial installation 1.1: completed

14 1 Initial installation 1.2 dry-fit of 300K-4K vessels and 40K screen Purpose: –check the handling procedure and sign-off of the cable hoist system –Check vacuum tightness and deformations of OVC and IVC Issues/comments: The internal screens (still, HEX, MC) must be installed in clean conditions, so they will not be installed in this phase through the floor opening. They will be installed and removed from the clean room at the end of the dry fit All the screens/vessels are delivered in upright position on a basement

15 Initial installation 1.2: 4K (40K, 300K) vessel set on platform Option1 Option2

16 Initial installation 1.2: 4K (40K, 300K) vessel ready for lifting Lifting ears and eye bolts are installed and hoist cables connected Lifting cables

17 Initial installation 1.2: 4K (40K, 300K) vessel lifted and fixed to the 4K flange

18 Initial installation 1.2: testing Leak tightness Vacuum Deformations

19 1 Initial installation 1.3 Installation of STILL-HEX-MC plates

20 Initial installation 1.3: installation of temporary support structure The main platform is moved aside

21 Initial installation 1.3: 300K-40K-4K vessels lowered down

22 Initial installation 1.3: the floor is closed and sealed off From this moment on the area around the cryostat will have to be kept clean at all time

23 Initial installation 1.3: installation of the STILL plate

24 Initial installation 1.3: installation of the STILL plate

25 Initial installation 1.3: installation of the HEX and MC plates

26 Initial installation 1.3: installation of the HEX and MC plates

27 2. Cryostat commissioning 2.1 integration of all the internal components (DU, pulse tubes, wire inserts, source guiding tubes, suspensions) –Preliminary cooling tests and functional tests of all components 2.2 installation of STILL lateral lead shield 2.3 installation of the internal top lead shield and dummy detector (DD) –alignment and calibration of the detector suspension system 2.4 Final tests COMMENTS: –The 2.1 phase will last for quite some time and will require several openings and closings of the cryostat: it is recommended to use a temporary support structure on the main platform to store the screens/vessels. This would allow the assembly of the main external shielding in parallel and off-line –In phase 2.1 not all the screens/vessels may be needed for the tests: those internal are stored on the first floor and could be installed when needed independently from the external ones

28 2. Cryostat commissioning 2.1 integration of all the internal components (DU, pulse tubes, wire inserts, source guiding tubes, suspensions)

29 Cryostat commissioning 2.1: installation of internal components In parallel: assembly of main shielding

30 Cryostat commissioning 2.1: installation of internal screens (1)

31 Cryostat commissioning 2.1: installation of internal screens (2)

32 Cryostat commissioning 2.1: installation of internal screens (3) Screens lifted by the cable hoist system or by hydraulic jacks

33 Cryostat commissioning 2.1: installation of external vessels (1)

34 Cryostat commissioning 2.1: installation of external vessels (2) main shielding completed

35 Cryostat commissioning 2.1: cold tests

36 Cryostat commissioning 2.1: cold tests During testing: The temporary support is removed

37 Cryostat commissioning 2.1: cold tests During testing: The platform with the main shielding is brought on-axis

38 2. Cryostat commissioning 2.2 installation of STILL lateral lead shield

39 Cryostat commissioning 2.2: preparation for installation of STILL lateral lead shield (1) The floor is opened

40 Cryostat commissioning 2.2: preparation for installation of STILL lateral lead shield (2) The 4K-40K-300K vessels are lowered into the main shield

41 Cryostat commissioning 2.2: preparation for installation of STILL lateral lead shield (3) Floor closed External vessels sealed off

42 Cryostat commissioning 2.2: preparation for installation of STILL lateral lead shield (4) Removal of internal screens

43 Cryostat commissioning 2.2: preparation for installation of STILL lateral lead shield (5) Removal of internal screens

44 Cryostat commissioning 2.2: preparation for installation of STILL lateral lead shield (6) Main shielding moved aside

45 Cryostat commissioning 2.2: preparation for installation of STILL lateral lead shield (7) Temporary support added on main platform

46 Cryostat commissioning 2.2: preparation for installation of STILL lateral lead shield (8) Platform raised and sealed

47 Cryostat commissioning 2.2: preparation for installation of STILL lateral lead shield (9) Floor opened Temporary support raised to reach floor level

48 Cryostat commissioning 2.2: installation of STILL lateral lead shield (1) Still lead cradle set on support

49 Platform lowered Cryostat commissioning 2.2: installation of STILL lateral lead shield (2)

50 Cryostat commissioning 2.2: installation of STILL lateral lead shield (3) Bottom lead layer and first ring added

51 Cryostat commissioning 2.2: installation of STILL lateral lead shield (4) Platform lowered

52 Cryostat commissioning 2.2: installation of STILL lateral lead shield (5) Installation of 2° lead ring

53 Cryostat commissioning 2.2: installation of STILL lateral lead shield (6) Platform lowered

54 Cryostat commissioning 2.2: installation of STILL lateral lead shield (7) Lead rings installation completed

55 Cryostat commissioning 2.2: installation of STILL lateral lead shield (8) Top Cu ring added Lead assembly lifted Tie rods connected Load transfer to STILL plate Check correct placement

56 Cryostat commissioning 2.2: preparation for installation of internal top lead shield (1) Platform lowered Floor closed Temporary support removed

57 Main shielding moved on axis Flexible seal is connected Floor opened Cryostat commissioning 2.2: preparation for installation of internal top lead shield (2)

58 The main shielding is raised The still lateral lead shield assembly is transferred on the main shielding Cryostat commissioning 2.2: preparation for installation of internal top lead shield (3)

59 The platform is lowered The floor is closed Cryostat commissioning 2.2: preparation for installation of internal top lead shield (4)

60 The internal screen (STILL; HEX; MC) are installed by using the hoist system Cryostat commissioning 2.2: preparation for installation of internal top lead shield (5)

61 The internal screens (STILL; HEX; MC) are installed by using the hoist system Cryostat commissioning 2.2: preparation for installation of internal top lead shield (6)

62 The floor is opened The internal screens (STILL; HEX; MC) are lowered into the main shielding by using the hoist system Cryostat commissioning 2.2: preparation for installation of internal top lead shield (7) This is the final configuration of the cryostat vessels/screens in “fully open” conditions

63 2. Cryostat commissioning 2.3 installation of the STILL internal top lead shield and dummy detector (DD)

64 The floor is closed The floor plug must be designed to withstand the load of the internal top lead shield Cryostat commissioning 2.3: installation of internal top lead shield (1)

65 A support structure allowing access to the anchoring points at the bottom of the support plate is added Cryostat commissioning 2.3: installation of internal top lead shield (2)

66 The base support plate is set on the platform Cryostat commissioning 2.3: installation of internal top lead shield (3)

67 The Lead layers and copper sheets are added in sequence Cryostat commissioning 2.3: installation of internal top lead shield (4)

68 The platform is raised to bring the internal top lead shield assy at the nominal position The suspensions are connected The load is transferred from the platform to the suspensions Cryostat commissioning 2.3: installation of internal top lead shield (5)

69 The platform is lowered The position of the internal top lead assy is surveyed and adjusted as required Cryostat commissioning 2.3: installation of internal top lead shield (6) An alternative option may consist in using the detector installation cart, thus avoiding moving up and down the main platform

70 The dummy detector is set on the platform the same cart+rail system used later on to install the detector may be used Cryostat commissioning 2.3: installation of the dummy detector (1) Installation cart Rail system

71 The dummy detector (DD) is lifted up to the nominal position Load is transferred to the suspensions The position of the DD is checked and the suspensions are adjusted if needed Cryostat commissioning 2.3: installation of the dummy detector (1)

72 The top part of the MC screen is installed by hands The innermost sections of the source guiding tubes are added Cryostat commissioning 2.3: installation of the top part of MC screen

73 Cryostat commissioning 2.3: installation of the STILL top lead ring

74 The floor is opened The platform is raised up to approach the MC flange The MC screen is fastened Cryostat commissioning 2.3: closing of the cryostat (1)

75 The platform is raised up again to allow the fastening of the HEX and STILL screens and of the STILL lateral lead shield Cryostat commissioning 2.3: closing of the cryostat (2)

76 The 4K-40K-300K vessels are lifted with the cable hoist system Cryostat commissioning 2.3: closing of the cryostat (3)

77 2. Cryostat commissioning 2.4 Final tests The cryostat is cooled down and the final commissioning tests are carried out including the full test of the calibration system

78 3. Detector installation 3.1 Preparation for the installation (removal of dummy detector) 3.2 detector installation

79 The 300K-40K-4K vessels are lowered with the cable hoist system Preparation for detector installation 3.1: opening of the cryostat (1)

80 The STILL-HEX-MC screens and lead shield are lowered by lowering the platform Preparation for detector installation 3.1: opening of the cryostat (2)

81 The platform is fully lowered The floor is closed Preparation for detector installation 3.1: opening of the cryostat (3)

82 The detector installation cart+rail system is installed on the floor Preparation for detector installation 3.1 : removal of the dummy detector (1)

83 The dummy detector is lowered Preparation for detector installation 3.1 : removal of the dummy detector (2)

84 The dummy detector is removed The clean room around the cryostat is now switched to “radon-free” Preparation for detector installation 3.1 : removal of the dummy detector (2)

85 The detector is moved in Detector installation 3.2 (1) Radon-free

86 The detector is raised to the nominal position The load is transferred to the suspensions Radon-free Detector installation 3.2 (2)

87 The suspensions are adjusted if needed The tapes are connected to PP1 The source guiding tubes are adjusted to match Radon-free Detector installation 3.2 (3)

88 The floor is opened The platform is raised The MC-HEX-STILL screen and the STILL lead shield are fastened to the corresponding plates The detector is flushed with N2 Radon-free Detector installation 3.2 (4)

89 The 4K-40K-300K vessels are raised by the cable hoist system The main shield is raised up to the top position The experiment is ready to run Detector installation 3.2 (5)

90 4. maintenance Subset of the procedures followed for the detector installation