1. Single Phase Test at CERN DUNE prototype Requirements (Cryostat and Cryogenics)
David Montanari / Johan Bremer /
Jack Fowler / Dimitar Mladenov
Apr 9, 2015
Rev. 14

2. Single Phase test at CERN
Outline
Intro
Cryostat
Detector installation
Infrastructures
Cryogenic systems
Outstanding issues
Summary
Apr 9, 2015
Single Phase test at CERN

3. Single Phase test at CERN
Intro
The goal of this prototype is to do a test of a full scale single phase TPCs (before the long-shut down in mid 2018).
Each panel is about 2.5 m wide, 6.3 m tall and 0.16 m thick and weights about 600 kg.
The general idea is to build a flexible facility that can potentially host other detectors in the future (including a 6.9 m tall TPC, with same other dimensions).
Current configuration is CPA-APA-CPA, but there is a proposal to do APA-CPA-APA.
TPCs are currently hung from the top plate, but there is a proposal to decouple them from the the top plate and hung the TPC support rails from a bridge across the roof of the cryostat supported on the floor of the building.
Current internal dimensions: 7,282 mm (Transv) x 9,522 mm (Parallel) x 8,391 m (Height).
Current external dimensions: 10,082 mm (Transv) x 12,322 mm (Parallel) x 11,291 m (Height).
These slides present the current requirements for cryostat and cryogenic systems.
Apr 9, 2015
Single Phase test at CERN

4. Cryostat Requirements – 1
Parameter
Value
Type of structure
Membrane cryostat
Membrane material
SS 304/304L, 316/316L or equivalent.
Other materials upon approval.
Fluid
Liquid Argon (LAr)
Outside reinforcement (Support structure)
Self standing steel enclosure. Might include heaters to prevent steel from freezing.
TPC size (Field Cage + Frame)
CPA-APA-CPA Configuration (APA-CPA-APA possible)
Length: 5,282 mm (Transverse to beam)
Width: 7,322 mm (Parallel to beam)
Total Height: 6,305 mm
Drift distance
2,500 mm
Minimum clearance of TPC (Back)
1,200 mm (CPA bar to the tip of the corrugation) *
Minimum clearance of TPC (Front)
1,000 mm (CPA bar to the tip of the corrugation) *
Minimum clearance of TPC (Sides)
Minimum clearance of TPC (Floor)
400 mm (CPA bar to the tip of the corrugation) *
Depth of LAr above TPC
300 mm (Over the CPA bar)
Minimum depth of LAr inside cryostat
7,491 mm (from the floor)
Ullage
900 mm (to match the Far Detector to test TPC supports)
Maximum static heat leak
10 W/m2 (Sides/Floor)
15 W/m2 (Roof)
Note (*): The TPC clearances are set to allow for installation of TPC from inside the cryostat
Apr 9, 2015
Single Phase test at CERN

5. Cryostat Requirements – 2
Parameter
Value
Vapor barrier
Stainless steel plates (part of support structure)
Insulation thickness
900 mm (it was 800 mm. Updated to reflect GTT standard dimensions)
Secondary barrier
GTT design (sandwiched within the insulation). Liquid tight.
Membrane thickness (GTT)
1.2 mm (assumed 2 mm to calculate outer structure)
Corrugation height
60 mm (to be changed to 70 mm)
Minimum inner dimensions cryostat
7,282 mm (Transverse) x 9,522 mm (Parallel) x 8,391 m (H) *
(flat plate to flat plate)
Operating gas pressure
Positive pressure. Nominally 70 mbar (~1 psig)
Design Pressure
345 mbarg (~5 psig)
Design Temperature
77 K (liquid Nitrogen temperature for flexibility)
Leak tightness
1E-6 mbar*l/sec
All surfaces in the ullage during operations
< 100K
Penetrations
1 Side penetration through the membrane at the lowest possible/practical elevation for LAr circulation and purification.
2 Beam windows. See location on drawings. Size TBD.
Accessibility after operations
Capability to empty the cryostat in 30 days and access it in 60 days after shutdown.
Lifetime / Thermal cycles
Consistent with LAr program. 20 cool down and total warm ups.
Note (*): The dimensions are calculated assuming to be able to insert a 6.6m high TPC inside the cryostat as well. The current one is only 6.0 m high.
Apr 9, 2015
Single Phase test at CERN

6. Single Phase test at CERN
EHN1
Bridge Crane
Single Phase Test cryostat
WA105 cryostat
Pit B
Apr 9, 2015
Single Phase test at CERN

7. Crane clearance above cryostat
Current hook height above cryostat as modeled 7,609 mm top cap thickness included. It currently leaves 1,320 mm of clearance for rigging and handling of TPC panels).
Hook height 9,900 mm above gallery floor
Pit B depth 9,000 mm
Apr 9, 2015
Single Phase test at CERN

8. Single Phase test at CERN
Plan view (From Ilias)
Pit B
Bridge Crane
WA105 cryostat
Possible alternative location
Single Phase Test cryostat
Apr 9, 2015
Single Phase test at CERN

9. Side view of cryostat w beam orientation
Top cap
Liquid level
Beam
~6°
11,291
Detector panels
5,000 mm
Membrane
Insulation
Outer Structure
Apr 9, 2015
Single Phase test at CERN

10. Top view of cryostat w beam orientation
Membrane
Primary Orientation
~10°
10,082
10°
Insulation
Outer structure
12,322
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Single Phase test at CERN

11. End view of cryostat w beam orientation
Beam entrance points on the upstream side of the cryostat:
Primary location: at the center of the cryostat (North-South direction) and ~5,000 mm from the floor.
Secondary location (if available): same height as the primary beam position, but with 1,500 mm offset to the North.
11,291
~1,500 mm
5,000 mm
North
South
Apr 9, 2015
Single Phase test at CERN

12. Cryostat Top Requirements – 1
Parameter
Value
Configuration
Metal plate reinforced with profiles/beams anchored to the membrane cryostat support structure with several penetrations of different size including two hatches and a manhole. The hatches shall be designed to be removable. If welded, provisions shall be made to allow for removal and re-welding six (6) times.
Dimensions
To match the cryostat: 10,082 mm x 12,322 mm x 1,500 mm (thick)
Plate/Trusses non-wet material
Steel if room temperature.
SS 304/304L or equivalent if at cryogenic temperature.
Wet material
SS 304/304L, 316/316L or equivalent. Other materials upon approval.
Fluid
Liquid Argon (LAr)
Design Pressure
345 mbar (~5.0 psig)
Design Temperature
77 K (liquid Nitrogen temperature for flexibility)
Maximum allowable roof deflection (*)
0.003 differential between APA and CPA
Pressure stability inside the tank
No requirements, as long as the roof deflection is within le limit. Same for atmospheric pressure variations.
Maximum static heat leak
15 W/m^2 (Greater than sides/bottom to allow for the penetrations)
Max vibration
No problem < 1 kHz
Worst is 100 kHz
All surfaces in the ullage during operations
≤ 100K
Note (*): This may require decoupling the TPC support from the top. We are now looking at an external bridge over the top plate supported on the floor of the building.
Apr 9, 2015
Single Phase test at CERN

13. Cryostat Top Requirements – 2
Parameter
Value
Hatch opening for TPC installation (*)
3,550 mm x 2,000 mm (in the current installation model)
Secondary open for personnel
2,000 mm x 1,000 mm (in the current installation model)
Grounding plate
1.6 mm thick copper sheet brazed to the bottom of the top plate.
Lifting fixtures
Appropriate for positioning the top and the different parts that constitute it.
Cold penetrations
Minimum 4. Location and design TBD.
Lifetime / Thermal cycles
Consistent with the LAr program TBD.
All surfaces in the ullage during operations
< 100K
Additional design loads
Top self-weight (including stiffening beams, membrane, insulation, etc.)
TPC (5,400 Kg total)
TPC anchors (TBD)
Live load (488 kg/m^2)
Electronics racks (400 kg in the vicinity of the feedthroughs)
Services (150 kg on every feed through)
Seismic load
CERN requirement
TPC anchors
Capacity: 3,000 kg each anchor.
Number and location TBD (Minimum 6).
1.6 mm thick copper sheet brazed to the bottom of the top plate
(LBN proposed design – TO BE VERIFIED).
Note (*): This may change depending on the TPC configuration. APA-CPA-APA requires a larger opening.
Apr 9, 2015
Single Phase test at CERN

14. Cryostat Top Requirements – 3
Parameter
Value
Penetrations
1 LAr In
1 Purge GAr In
1 Vent GAr
2 Pressure Safety Valves
1 Vacuum Safety Valve
1 GAr boil off to condenser
1-2 Liquid level sensors
1-2? Instrumentation? Purity Monitors? Light pulsers??
1 Temperature sensors feedthroughs ?
1 LAr for cool down
1 GAr for cool down
TPC signal 12” CF Cold
3 TPC feed through each row (250mm CF) regardless of TPC configuration
1 Photon Detector for APA (10” CF) Cold
Calibration ??
Lifetime
Consistent with LAr program
Thermal cycles
20 cool down and total warm-ups?
Note: all feedthroughs need a purge port to ensure that the top flange is warm and no back diffusion brings contaminants back into the cryostat.
The design is connected to the installation procedure. Since the design has to allow for CAC and ACA configurations, each row of TPCs will have the same ports.
Apr 9, 2015
Single Phase test at CERN

15. Preliminary thinking on top design
Large hatch
Large hatch
Penetrations
Reinforcements
Beam
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Single Phase test at CERN

16. Detector Installation Plan
The current model is to install the detector panels by passing TPC components through a large hatch (dimensions depend on the TPC configuration) in the top cap of the cryostat and connect them to the bridge supported on the floor. The current plans for the LBNF Far Detector also feature an external support for the TPCs.
Additional footprint: are there space limitations in the building?
Needs to support both different detector configurations. Currently the plan is for the mechanical supports and feedthroughs to be the same for each row of planes.
Apr 9, 2015
Single Phase test at CERN

17. TPC lowered inside Cryostat
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Single Phase test at CERN

18. Cryostat Infrastructures Requirements
Parameter
Value
Current cryostat footprint (estimate).
Need to estimate the TPC support bridge also.
12,322 mm (L) x 10,082 mm (W)
Work area around the top of the cryostat (platform type)
2.0 m around the whole perimeter
Lay down space
TBD
Clean Room space
Class 10,000 where TPC components are assembled and installed. Size depends on installation technique.
Crane coverage
Over the cryostat and the lay down space
Crane capacity
30-40 ton (needs feedback from the design of the top plate). Could be the current overhead crane, but how can we integrate it inside the Clean Room ??
Could use a floor mounted gantry ??
Minimum hook height above the cryostat for TPC installation
4.5 m + lifting fixture (TPCs are rotated prior to insertion)
Lighting
UV filtered lights are needed in all work areas where the photon detectors are exposed (if any).
Ventilation
Appropriate additional ventilation when working inside the cryostat.
Scaffolding
Up to 7.0 m in height inside the cryostat.
Power outlets
For portable tools and welding machines inside the cryostat
Note: some of the requirements need input from the design of the top plate, the outer structure and the beam window. They also need to be integrated with the installation process.
Apr 9, 2015
Single Phase test at CERN

19. Current electrical requirements (Preliminary)
The cryostat membrane and any supporting structure need to be isolated from any building metal or building rebar with a DC impedance greater than 300 kOhm.
The cryostat, or “detector” ground, shall be separated from the “building” ground.
A safety ground network consisting of saturated inductors to be used between detector ground and building ground.
Apr 9, 2015
Single Phase test at CERN

20. Electronics, Computing, Power
Electronics Racks on top of the cryostat.
Racks for computers.
Info on Cables/Racks is being collected and should be available by end of April as requested by Guillaume Gros.
Clean power with separate grounding for detector. How much ??
Normal power for all the rest. How much ??
Control room space for DAQ and detector monitoring.
Apr 9, 2015
Single Phase test at CERN

21. Cryogenic System Requirements
Parameter
Value
Location
Preferably not in front of the cryostat (on the beam line)
LAr purity in cryostat
10 ms electron lifetime (30 ppt O2 equivalent)
GAr Piston purge rate of rise
1.2 m/hr
Membrane cool-down rate
From manufacturer
TPCs cool-down rate
< 40 K/hr
< 10K/m (vertically)
Mechanical load on TPC
The LAr or the gas jet pressure shall not apply a mechanical load to the TPC greater than 200 Pascal.
Nominal LAr purification flow rate (filling/ops)
5.5 day/volume change (3.95 m^3/hr = 66 l/m)
All surfaces in the ullage during operations
< 100K
GAr purge within insulation
1 volume change/day of the open space between insulation panels
Cooling power
Cool down: TBD
Operations: 3.4 kW + TBD:
Electronics heat load ??
Heat leak of cryo-piping ?? From cryo-piping design.
Lifetime of the cryogenic system
Consistent with the LAr program TBD
Control system
Integrated with the other neutrino projects (as much as possible)
Apr 9, 2015
Single Phase test at CERN

22. Cryogenic Systems Requirements (Preliminary)
To the extend possible, we want to design a portable system that could be fabricated and tested in one place and installed at destination in another, with quick connections to/from cryostat.
External Cryogenics  can be located anywhere, will probably be outside of the building.
Internal Cryogenics  inside the cryostat.
Proximity Cryogenics  several locations:
Condenser (and maybe LN2 dewar/phase separator) will have to be located above the roof of the cryostat or nearby, but higher than the roof of the cryostat.
LAr circulation pump at the back of the cryostat, on the floor, as low as possible.
Penetrations through the top of the cryostat, in the back region.
GAr purge in the insulation two in and two out at a certain elevation with piping going to the rest of the system.
The remaining can be located where space permits, preferably in the vicinity of the cryostat.
LAr/LN2, GAr/GN2 piping will connect Proximity/External/Internal cryogenics.
The design will inform on size and specific location.
Apr 9, 2015
Single Phase test at CERN

23. Single Phase test at CERN
Outstanding Issues
Detector configuration: CPA-APA-CPA or APA-CPA-APA ??
External trigger counters: do we need them ?? How many and where ?? How much space is required for installation (including cables to racks) and service ??
Photon detector: how many and where ??
The drift distance is currently 2.5 m. Is it confirmed ??
Design of TPC mechanical support: from bridge outside of the cryostat, supported on the floor of the building. May add requirements to the infrastructures (floor space, …).
Size and type (cold/warm) of penetrations through the roof required for TPC operations and monitoring: calibrations? photo detection? purity monitors? Others?
Instrumentation that need to go inside the cryostat (purity monitors, etc.).
Confirmation of the weight of the TPC (5,400 kg total ??). If the detector configuration changes, this will change.
Location and design of the cold penetrations.
Location of TPC anchors (if preferred location exists).
Grounding and isolation requirements.
Electronics, computing and power.
Apr 9, 2015
Single Phase test at CERN

24. Single Phase test at CERN
Summary
Current internal dimensions: 7,282 mm (Transv) x 9,522 mm (Parallel) x 8,391 m (Height).
Current external dimensions are: 10,082 mm (Transv) x 12,322 mm (Parallel) x 11,291 mm (Height).
The cryostat is ~10 degrees rotated with respect to the beam, currently at the end of Pit B.
Preliminary requirements for cryostat, cryogenics and infrastructure outlined.
Several outstanding issues that may change dimensions and requirements. Need to be addressed asap.
Apr 9, 2015
Single Phase test at CERN

25. Backup

26. Single Phase test at CERN
Outer Structure
Parameter
Value
Configuration
Self standing steel enclosure. Might include embedded heaters to prevent steel from freezing (Floor + Sides).
Vapor barrier
Stainless steel plates connected to the I-beams of the support structure.
External dimensions
10,082 mm (Transverse) x 12,322 mm (Parallel) x 11,291 m (H)
Design Pressure
345 mbarg (~5 psig)
LAr + GAr load
949 ton (Bottom)
547 ton (Long side)
418 ton (Short side)
Uplift force (top)
- 239 ton (GAr)
Additional loads
Loads transferred from the top plate down to the support structure
Grading at the top (TBD)
External loads of counters (if any)
Design code
CERN regulation
Seismic load
Penetrations
1 side penetration from the inner membrane at the lowest possible/practical elevation for LAr circulation and purification.
2 Beam windows. See location on drawings. Dimensions TBD.
4 side penetrations for GAr purge in insulation (2 In, 2 Out). Location and size TBD.
Maximum deflection towards outside
TBD
Apr 9, 2015
Single Phase test at CERN

27. Detector Installation Plan – 2
The second installation plan is to build the detector directly in the cryostat without the top cap using temporary supports. Once complete, attach to the underside of the top cap. Then lower the complete assembly. (See backup slides option 2 for some older conceptual slides). Potential problems with cryogenic installation.
Apr 9, 2015
Single Phase test at CERN

28. Concept 1 Needs updating with new TPC configuration and Cryostat
Apr 9, 2015
Single Phase test at CERN

29. Manipulating the TPC components
Apr 9, 2015
Single Phase test at CERN

30. Manipulating the TPC components II
Apr 9, 2015
Single Phase test at CERN

31. Manipulating the TPC components III
Apr 9, 2015
Single Phase test at CERN

32. Concept 2 Needs updating with new TPC configuration and Cryostat
Apr 9, 2015
Single Phase test at CERN

33. Installation hardware with CPA support rail
Support rail length is shorter than top cap width. This rail will be fixed and supported from the underside of the top cap later.
The rail is positioned close to the edge of the cryostat for allow personnel access to the hangers from the top edge of the containment vessel.
Assume the top edge of cryostat can support load and that people can work there.
Apr 9, 2015
Single Phase test at CERN

34. Moving CPA over Cryostat and rotation
Assume that there are 2 lifting devices from the crane bridge and they can be operated at the same time to rotate the TPC planes.
The planes would be lifted on edge horizontally over the cryostat. One lifting device would be lowered while the other is stationary to perform the rotation of the object.
Apr 9, 2015
Single Phase test at CERN

35. Positioning and attachment of CPAs to support rail
Once rotated the lower cable would be disconnected from the plane and the upper connection would be used to move the plane under the support rail.
The plane would be connected to the support rail by personnel working from the top of the containment vessel.
The second plane would be moved in and connected to complete the 1st CPA plane assembly.
Apr 9, 2015
Single Phase test at CERN

36. Translate CPA plane assembly to opposite side of Cryostat
Once completed, we would translate the 1st CPA plane assembly to the opposite side of the cryostat.
This could be done with rollers on the cryostat or using the overhead crane.
Apr 9, 2015
Single Phase test at CERN

37. Install APA planes and translate
Install the APA rail and the two APA planes in a similar method.
Then translate the APA planes to opposite end of the cryostat with the other CPA plane.
Apr 9, 2015
Single Phase test at CERN

38. Install the 2nd set of CPA planes
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Single Phase test at CERN

39. Position the 3 TPC planes
After positioning the 3 planes to their final positions with respect to the cryostat walls and each other, install the end field cages. These could be supported from the APA and CPA rails.
How to deploy the upper field cages?
When and how to cable the APA planes?
The lower field cages could stored on the floor of the cryostat and connected at this point.
Apr 9, 2015
Single Phase test at CERN

40. Single Phase test at CERN
Install Top Cap
Bring the top cap over the 3 TPC planes and lower to the support rails.
Connect the ends of the support rails to the hangers on the underside of the top cap.
The HV probes could be installed through the top cap at this point into their receptacles on the CPAs.
The APA cables could be “fished” through the service feed thru for connection later.
Remove the installation hardware from the ends of the support rails.
Lower the top cap and the TPC down in the cryostat.
Apr 9, 2015
Single Phase test at CERN

41. Plan view (Cryostat rotated 10 degrees)
Bridge Crane
WA105 cryostat
Single Phase Test cryostat
Pit B
Note: the angle could change a little bit.
Apr 9, 2015
Single Phase test at CERN

42. Single Phase test at CERN
Current assumptions
Dimensions from EHN1 drawing:
Hook height above floor of pit B: 18,900 mm.
Hook clearance over top cap: 7,609 mm.
Dimensions from detector design:
Detector height: 6,289 mm.
Clearance for detector installation (between height of detector and hook over cryostat): 1,320 mm. How much of this is needed for rigging and handling?
Beam direction from interaction between Cheng-Ju and Ilias.
Apr 9, 2015
Single Phase test at CERN

43. Example: Layout of LBNE 35 ton racks
Trig_Scint
TPC_PD
Purity Monitor
Calibration
DAQ_1
DAQ_2
RPS 1
Empty 2
Cable Dressing
Ethernet Switch-2
NIM Bin
Camera System
Nova Timing Master 3
CCU4
Wire Manager 4
ANL Calibration Module
Ethernet Switch-1 5 6 7
CCU3
Fan
PC-1 8
8 x SSP 9
PM Multiplexer
PC-2 10 11
Penn Trig board
PC-3 12
SurgeX 13 14
Wiener MPOD-Wire/FC PC
IU Calibration System
PC-4 15 16
PC-5 17
Nova Timing Slave 18
PC-6 19 20 21
PC-7 22 23
PC-8 24
Wiener MPOD-LV 25
PC-9 26 27 28
ATCA Shelves 29 30
CCU2 31
Fan/Plenum 32 33 34
CCU1
Crate Power Supply 35 36 37
Impedance Monitor 38
AC Switch Box 39 40 41 42
Note: This is just an example from a smaller detector.
Racks currently on top of Cryostat
Apr 9, 2015
Single Phase test at CERN

44. Example: Current LBNF Rack Equipment
Preliminary List of Detector Electronics Rack types and contents-Per Detector
# of racks
Location
Rack Name
Rack Components
Space (U)
Quantity
Power (VA)
Power Tot (VA)
Notes FD
SiPM system
HV Power Supply
TBD
2 ps/port Caen 5740 ch32, 4 APAs
Shaper
Power Supply backplane
16 channels
Splitter
SiPM FE amplifier
Computer
Cold Electronics
Wiener MPOD 80
8.1
648
2560ch/apa, 10mW/ch. (200W) (4MB/APA) (20APA)
40W/APA=65W*20=1300
1.5V/.6A,2.1V/1A,2.8V/1A,3.6V/.5A,5V/.1A
Drift HV
Power Supply 4
230
920
-115kV/1mA, Heinzinger PNChp neg/M
230V/1A (1-ph), 400V/1A (3-ph) other avail.
TPC Wire Bias 20 7
140
Vg:-1kV,Vu:-1kV,Vx:+1.5kV all 2mA (20APA)
Field Cage Bias 1 2
-1kV/2mA
1710
Computers 15
Rack Protection
Smoke Sensor
assume 15 racks per detector
Rack Protection Mon
120V/<1A
PDU (Power Dist. Units)
Power requirement based on service.
Slow Controls
Intl'k Switch
Hot Spares Rack 3
2400
43200
120V/20A service
Total (kVA)
43.20
L. Bagby - FNAL
Note: This is just an example from a much larger detector.
Apr 9, 2015
Single Phase test at CERN

45. Example: Current LBNF Cavern Equipment
Preliminary List of Detector 10 kt Cavern Equipment
Equip. Name-BLDG
Quantity
Power
Unit
Power (Tot)
Generator Backup
Power Source
Notes
Lighting-Cavern 1 35
kVA
yes
Lighting-Drifts 10 kW
HVAC-Chiller 2
149.2
298.4
200HP
HVAC-Circulating Pumps 4
22.38
89.52
30HP
HVAC-Fan Coil Units 30
1.492
44.76
2HP
HVAC-Air handler supply fan
14.92
20HP
HVAC-Air handler exhaust fan
Sump Pumps 6
3.73
5HP
Vent Fans
8.952
Welding Outlets
41.57
166.28 no
(480V/50A)..Millers David Matinary
Monorail crane-10 ton-hoist(15)+trolly(1)
11.936
11.94
(work cell hoist) 16HP*746
Fire
1.5
Paul-SURF
VESDA
sniffer
HSSD system in cryostat
Halon
Nitrogen Booster Compressors
111.9
447.6
150 HP each
Liquid Argon Pumps
5.2
20.8
480V
Heater Cables
12.6
25.2
Purification Skid (Blowers) 28 46
Purification Skid (Cooling)
21.1 21
Purification Skid (Heating)
63.6 64
System Controls
3.0 3
SLAC RCE System Test Area
1.8
7.2
3 racks + 1 table + 1 bench 15A service
Temporary lighting in cryostat
1.3
1 W/ft^2
Temporary ventilation in cryostat: blower
0.746
0.75
3-ton, 1HP
Temporary ventilation in cryostat: compressor
3.9
General air monitoring in cryostat
TBD
Hoist near hatch-3 ton-hoist(2HP)+trolly(.5HP)
1.865
1.87
(hoist in cryostat) 2.5HP*746
Power for potential battery charging station/powered carts
HEPA filter blower units
0.336
3.36
similar to uboone clean room
Total Power (kVA)
L. Bagby - FNAL
Note: This is just an example from a much larger detector.
Apr 9, 2015
Single Phase test at CERN

46. Cryostat sizing Length
APA width 2300 mm (x 3).
12.5 mm of edge boards on each side of the center joint (x 4).
50 mm from the SS APA (active area boundary) frame to field cage (x 2).
76.2 mm diameter of CPA tube (x 2).
1,000 mm clearance to membrane for access and egress.
1,200 mm clearance for piping and instrumentation.
60 mm depth of corrugations (x 2).
9,522 mm total length of cryostat.
100 cm
100 cm
Mar 20, 2015
Single Phase test at CERN Requirements

47. Single Phase test at CERN Requirements
Cryostat sizing Width
76.2 mm - APA thickness 3”.
4.76 mm height of wire layers on each side (x 2).
2,500 mm drift distance (x 2).
38.1 mm – Half the diameter of 3” CPA frame (x 2).
1,000 mm to membrane for access and egress (x 2).
60 mm depth of corrugations (x 2).
6,256.5 mm total width of cryostat.
Mar 20, 2015
Single Phase test at CERN Requirements

48. Cryostat sizing Height for 6.6 m APA
6,638.7 mm - APA side tube length.
76.2 mm - Distance from top of the cross tube down to the beginning of active volume.
76.2 mm – Diameter of CPA tubing above active volume.
300 mm of liquid above CPA tube.
16 mm boards at bottom of frame.
76.2 mm – Diameter of CPA tubing below APA bottom boards.
300 mm of liquid below CPA tube.
100 mm of space reserved for piping at bottom of cryostat.
7,491 mm is liquid level height.
900 mm ullage based on far detector design.
60 mm depth of corrugations (x 2)
Total height from floor to underside of top cap = 8,391 mm.
Total inner volume 582 m3.
Liquid Volume
APA active volume
APA
CPA
Bottom boards of APA
Space for piping
Mar 20, 2015
Single Phase test at CERN Requirements
Floor of Cryostat

49. Cryostat Height sizing (6.0 m APA)
6,060.1 mm - APA side tube length
76.2 mm - Distance from top of the cross tube down to the beginning of active volume.
76.2 mm – Diameter of CPA tubing above active volume.
300 mm of liquid above CPA tube.
16 mm boards at bottom of frame.
76.2 mm – Diameter of CPA tubing below APA bottom boards.
300 mm of liquid below CPA tube.
100 mm of space reserved for piping at bottom of cryostat.
6,912 mm is liquid level height.
900 mm ullage based on far detector design.
60 mm depth of corrugations (x 2)
Total height from floor to underside of top cap = 7,812 mm.
Total inner volume 542 m3.
Liquid Volume
APA active volume
APA
CPA
Bottom boards of APA
Space for piping
Mar 20, 2015
Single Phase test at CERN Requirements
Floor of Cryostat

50. Cryogenic Systems Strategy
We, as a community, want to develop a common strategy to address LAr/LN2 cryogenic needs for:
SBN-ND/FD (short term).
Single/Double Phase test at CERN (short term).
LBN (long term) and other future generation detectors to come.
We want to minimize the effort and design and fabricate a standard system that could be “enlarged” and adapted for future short/mid/long term needs.
To the extend possible, we want to design a portable system that could be fabricated and tested in one place and installed at destination in another, with quick connections to/from cryostat.
We want to test all features that might be relevant and of interest for present and future detectors: external LAr pumps, cold roof (< 100 K), etc. and the possibility to turn them on/off to compare.
Three parts are identified (for both LAr and LN2 systems):
Proximity Cryogenics
External Cryogenics
Internal Cryogenics
Apr 9, 2015
Single Phase test at CERN

51. PFD of LAr system (Preliminary)
Apr 9, 2015
Single Phase test at CERN

52. PFD of LN2 system (Preliminary)
Apr 9, 2015
Single Phase test at CERN

53. Cryogenic Systems Capabilities
To clean the cryostat
GAr purging and venting
GAr recirculation and purification.
To cool down the cryostat and fill it with LAr.
To continuously purify the LAr (filling and operations).
To re-condense and purify the boil off gas.
To handle the LAr/GAr and LN2/GN2 flows during all phases.
To maintain the top of the cryostat at ≤ 100 K.
To monitor and control internal and external pressure:
Pressure Control / Vacuum Protection
PSV, VSV, Auto/Manual venting.
Make-up GAr.
To handle the GAr purge inside the insulation.
Instrumentation and diagnostics: T and P sensors, flow meters, liquid level sensors, etc., analytical instruments to measure the contamination, in-line Purity Monitors (??), etc.
To sample GAr from the ullage and measure the concentration of contaminants.
Control system.
Flexibility: new features may be tested (cold roof, LAr external pump). To the extent possible, it is desired to have a flexible system where we can turn on/off the various features for comparison.
Apr 9, 2015
Single Phase test at CERN

54. Cryogenic systems outstanding issues
Selection of the type of LAr filtration system (Mol Sieve/Copper VS Oxysorb/Hydrosorb)
Portability/Scalability: studies on portability and how to design a portable/scalable system that can serve present and future generation detectors of any size.
Studies on how to keep all surfaces at a Temperature lower than 100 K.
LAr Pump (Outside):
Need to see how to isolate the pump electrically and mechanically from the TPC. Issues with electronic noise and microphonics.
Check grounding scheme.
Apr 9, 2015
Single Phase test at CERN

55. Current cryostat schedule (DRAFT)
Preliminary Design: Jan-Jun 2015.
Design Review: Jul-Sep 2015.
Final Design/Procurement: Oct 2015-Sep 2016.
Construction: Oct 2016-Jul 2017.
Apr 9, 2015
Single Phase test at CERN