1 MICE at RAL CE Collaboration meeting @ RAL, 2 November 2003 Elwyn Baynham, Tom Bradshaw, Iouri Ivaniouchenkov, Tony Jones, Jim Rochford Engineering Department, RAL
Dec 20, 2015
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MICE at RAL
MICE Collaboration meeting @ RAL, 2 November 2003
Elwyn Baynham, Tom Bradshaw, Iouri Ivaniouchenkov, Tony Jones, Jim Rochford
Engineering Department, RAL
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Scope of presentation
• Layout
• Infrastructure : Hydrogen system
• Infrastructure : Cryogenic system
• Next steps
MICE Collaboration meeting @ RAL, 2 November 2003
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MICE layout : Conceptual points
MICE Collaboration meeting @ RAL, 2 November 2003
MICE shielding incorporates:- radiation shielding- magnetic shielding
Radiation safety :- a roofed blockhouse ( to shield against direct and scattered X/gamma-rays and neutrons)
Fire safety:- hydrogen zone is a high risk fire zone => max 25 metres long escape path
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MICE layout : Experimental hall
MICE Collaboration meeting @ RAL, 2 November 2003
View upstream the beam
View downstream the beam
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MICE magnetic shielding
MICE Collaboration meeting @ RAL, 2 November 2003
2m
3.8m
5.6m 17m
6m
Revised 3D model:
Open ended rectangular box model20mm thick iron plate
+Two 150mm thick iron platesID 40mm OD 3.6m
6MICE Collaboration meeting @ RAL, 2 November 2003
MICE magnetic shielding
For 200Mev/c, beta 43cm - mode
Outer surface of Outer surface ofShield components ISIS injector wall Control room wall
Bmod (g) Bmod (g)Top+sides+detector 0.8 2.23
Top+sides 0.72 2.33Sides+detector 0.71 2.39
No shielding 1.78 12.5
200MeV/c beta 43cm
Fringe field on outer walls
7MICE Collaboration meeting @ RAL, 2 November 2003
cellar
1 m
services zone
Concrete radiation shielding Steel magnetic shielding
stay clear zone
Scale:
Main gate
Exit
High level exit
Sliding lead door
Path way >= 0.8 m
5.6 m
MICE LayoutOption: MICE restricted area is inside a roofed blockhouse
Door
door
cold box
Bridge
3.8 m
Door
Sliding lead door
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MICE Layout Version: 28 October 2003
MICE Collaboration meeting @ RAL, 2 November 2003
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MICE Layout Version: 28 October 2003
MICE Collaboration meeting @ RAL, 2 November 2003
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cellar
1 m
services zone
Concrete radiation shielding Steel magnetic shielding
stay clear zone
Scale:
Main gate
Exit
High level exit *
Sliding lead door
5.6 m
door
door
door
cold box
3.8 m
MICE LayoutOption: MICE restricted area in the hall is separated with a single shielding wall
* Door is normally blocked when MICE is running
11MICE Collaboration meeting @ RAL, 2 November 2003
cellar
1 m
services zone
Concrete radiation shielding Steel magnetic shielding
stay clear zone
Scale:
Main gate *Exit *
High level exit *
5.6 m
door
door
cold box
3.8 m
* All doors are normally blocked when MICE is running
MICE LayoutOption: All the hall is a MICE restricted area
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MICE layout : Questions
Can we run MICE without access into the experimental hall ?
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Hydrogen system: Conceptual points
MICE Collaboration meeting @ RAL, 2 November 2003
• Closed system concept :
- hydrogen absorber and a storage unit form a single closed system in a way that hydrogen is either stored as a gas in the storage unit or is liquefied in the absorber;
- pressure in the system is always higher than the atmospheric pressure.
• Individual hydrogen system for each absorber
Ideally it is a truly passive system
Air can not leak inside the system
Safety pros:
Minimal amount of hydrogen per system
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Hydrogen system: Options
Hydrogen storage unit = large (about 30 m3) tank Pros: truly passive system Cons: about 100 m3 for the location of tanks (=> on the roof ?)
MICE Collaboration meeting @ RAL, 2 November 2003
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Hydrogen system: Options
Alternative option:
Hydrogen storage unit = compact (< 1 m3) metal hydride bed
Pros: - very compact system (easier to collect hydrogen in case of leak) - hydrogen is stored as a solid compound Cons: not a passive system (requires active heater/cooler)
A question then: is it a reasonable compromise from the safety point of view ?
MICE Collaboration meeting @ RAL, 2 November 2003
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P P VP Vacuum pumpBursting diskPressure relief valveValve
Pressureregulator
Pressuregauge
18 K Heto Compressorvia Radiation shield
14 K Hefrom Cold box
Liquid level gauge
LH2 Absorber
Vacuum
Vacuum vessel
LHe Heat exchanger
Hydrogen flow and safety system(option with a hydrogen tank)
Internal Window
70 K Safety window
H2 Gas bottle
PPFill valve
Hydrogen tank
Volume: about 30 m3
1.6 bar abs > Pressure > 1.1 bar abs
Vent outside flame arrester
He Purge system
Non-return valve
Vent outsideflame arrester
Vent valve
Vent valve
1.7 bar
2.1 bar
H2 Detector
H2 Detector
P
P
PP
Evacuated vent buffer tank
VP
P
VP
X 2X 2
VP
Version: 09/06/2003
Hydrogen module enclosure
H2 Detector
Ventilationsystem
Vent outsideflame arrester
Node 1
Node 2
Node 3
Node 4
Node 5
17MICE Collaboration meeting @ RAL, 2 November 2003
P P VP Vacuum pumpBursting diskPressure relief valveValve
Pressureregulator
Pressuregauge
18 K Heto Compressorvia Radiation shield
14 K Hefrom Cold box
Liquid level gauge
LH2 Absorber
Vacuum
Vacuum vessel
LHe Heat exchanger
Hydrogen flow and safety system (option with a metal hydride storage unit)
Internal Window
70 K Safety window
H2 Gas bottle
PPFill valve
Metal hydride hydrogen storage unit
(20 m3 capacity)
Vent outside flame arrester
He Purge system
Non-return valve
Vent outsideflame arrester
Vent valve
Vent valve
1.7 bar
2.1 bar
H2 Detector
H2 Detector
P
P
PP
Evacuated vent buffer tank
VP
P
VP
X 2X 2
VP
Version: 06/08/2003
Hydrogen module enclosure
H2 Detector
Ventilationsystem
Vent outsideflame arrester
Chiller/ heaterunit
Node 1
Node2
Node 3
Node 4
Node 5
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Hydrogen system layout: Option with a hydrogen tank
Concrete radiation shielding Steel magnetic shielding
Hydrogen storage tank
H2 absorber
MICE Collaboration meeting @ RAL, 2 November 2003
H2 buffertank
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H2
Storage unit
Ventilation duct
Radiationshieldingwall
H2
Buffer Tank
(1m3 approx)
H2 absorber
Vacuum jacket
Hydrogen system layout: Option with a metal hydride unit
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Hydrogen system layout: Option with a hydrogen bed
MICE Collaboration meeting @ RAL, 2 November 2003
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MICE Cryogenic System Design
Tom Bradshaw
Iouri Ivaniouchenkov
Elwyn Baynham MICE Meeting October 2003
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System Requirements
• Decay magnet (PSI Magnet) We need to cool this magnet separately as it was designed to
operate with supercritical helium (it could probably run on two-phase). This will be installed at an early stage and needs testing. Also – it will be required for the muon beam line when MICE has gone….
• Solenoids• Detectors• Absorbers
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System Requirements
Component list
Item 14K 4K (Watts)
Absorbers
All sources 150 e-mail from MAC
Transfer lines 41 27.4 M Green estimate
Magnet shield cooling
Couplers x2 30.3 3.2 M Green estimate
Focus magnets x3 21.9 5.2 M Green estimate
Detector mags x2 13.8 2.8 M Green estimate
Current leads small
Detectors 40 A Bross e-mail
Total W 257.00 78.60
Equivalent 4.4K 80.77 78.60 (Total = 159.4W)
Summary
Grand total 159.4
Contingency 30%
Budget for 207.18Watts
Note that we may need to run with Helium in the absorbers (TBC)
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Cryogenic System
Basic Layout
Powered valve
Gate valve
Relief Valve
Spectrometer
Absorber/Focus
Coupling
Absorber/Focus
Coupling
Absorber/Focus
Spectrometer
SciFi Detector
4K14K
Return
Etc….
Compressors
Gas Store
4K
14K
Note that we need 14K for hydrogen absorbers
Layout assumes that we can use 14K for shield cooling
Valve box
Cold boxControl dewar
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Staging
• Step 1 Decay magnet + Sci-Fi
• Step 2 plus spectrometer
• Step 3 plus spectrometer
• Step 4 plus absorber/focus + hydrogen
• Step 5 plus coupling absorber/focus + hydrogen
• Step 6 plus coupling absorber/focus + hydrogen
Spring 2006
2007
Dates are approximate …..
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Refrigerator power
0
100
200
300
400
500
600
40 45 50 55 60 65 70 75
Gas flow g/s
Ref
rig
erat
ion
po
wer
W
No LN2With LN2MarginNo Margin
TCF 50 Refrigerator power (Linde)
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Refrigerator costs
• TCF 20 for decay magnet - £324k
• TCF 50 for everything else - £782k– But does not include control dewar, valve box
or transfer lines.
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Cost reduction exercise
Need to reduce cost of cryogenics
– Use of cryocoolers on the magnets will reduce the requirement considerably but will increase the cost of the individual magnets provided by the participants, as the individual design is more complex.
– Looking to borrow/re-use existing plant (possibly CERN) but cold box may require modifications to get 14K. Installation and re-commissioning costs will be high and we don’t have much manpower.
– We will look at transfer line costs but the staging of MICE and the need to change absorbers makes this difficult.
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MICE Collaboration meeting @ RAL, 2 November 2003
Cryogenic system: Conceptual points
• Individual cryogenic system for the beam-line SC solenoid
• Common cryogenic system for the rest of MICE
MICE cooling power requirements, Watts @4.2K
Beam-line SC solenoid 35 35
MICE: Magnets 40 60 Absorbers 100 60 SciFi detectors 150 40 (7:1 option) Extra for absorbers with LHe 53 53 -------- ------- Sub-total: 343 213
Total 378 248+ 30 % margin 500 322
Proposal Revised
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LINDE Helium liquefier/ refrigerator TCF20Cold box with integrated purifier
Dimensions:1985 mm(L)×1100mm(W)×2227mm(H)Weight:1280 kg approx
Utility requirements:Power : 400 V / 50Hz / 3 phase / 3kWCooling water: 0.4 m3/hour, 3-6 bar, 10-25 °C, closed cycle is preferredHelium gas: Helium Grade A (99.996 Vol%)LN2 consumption: 0.8-1 ltr/ltr LHe, saturated liquid
Oil injected screw compressor
Model: KAESER DSD201/241Motor: 110/132 kWDimensions: 2.23 m(L)×1.96 m(W)×1.86 m(H)Weight: 3300/3400 kg
Utility requirements:Power: 400 V/ 50 Hz / 3 phase/ ? kWWater (for water cooled type): 6.7-8.1 m3/hourAir (for air cooled type): 14000-21000 m3/hour
Oil removal systemL: 0.7 mW: 0.8 mH: 2.4 m
200 kg
Pressure control panel
L: 0.8 mW: 0.42 mH: 0.8 m
50 kg
Recovered helium gas drier
L: 0.3 mW: 0.3 mH: 1.9 m
75 kg
Pure gas buffer vessel Volume: 3 – 8 m3(for liquefaction rate: 30-75 ltr/hour)
Design pressure: -1/+16 barg
Control system
Type: SIEMENS SIMATIC S7-300with a SIMATIC OP270-6’’ operator panel(for a stand-alone control and monitoring)
Operating system: S7 (runs on Windows 95 and higher)
Remote monitoring an control: via MPI interface (up to 5 metres) to PC
Plant performance
Liquefaction capacity: without LN2 pre-cooling 18 / 30 / 37 litres/hour ( compressor: DSD141/201/241)
with LN2-pre-cooling 36 / 57 / 78 litres/hour ( compressor: DSD141/201/241)
31MICE Collaboration meeting @ RAL, 2 November 2003
LINDE Helium liquefier/ refrigerator TCF50
Cold box with Instrument panel and Terminal box
Dimensions:2400 mm(L)×1900mm(W)×3270mm(H)Weight: 2600 kg approx
Utility requirements:Power : up to 6 kW (3/1 phase, standard voltage)Cooling water: up to 0.95 m3/hour, 3-10 bar, 18-32 °C Instrument air: up to 10 Nm3/hour, 6 bar min,
Helium gas: Helium Grade A (99.996 Vol%)
Oil injected screw compressor
Model: KAESER ESD 351-50Motor: 200 kWDimensions: 2.65 m(L)×2.2 m(W)×2.2 m(H)Weight: 4900 kg
Utility requirements:Power: 214 kWWater : 18 m3/hourAir : 4 m3/hour
Oil removal system and Gas management panel
L: 1.4 mW: 1.3 mH: 2.5 m
? kg
Pure gas buffer vessel
Control system
Type: SIEMENS SIMATIC S7-400with a SIMATIC OP270-10’’ operator panel(for a stand-alone control and monitoring)
Operating system: S7 (runs on Windows 95 and higher)
Remote monitoring an control: via MPI interface (up to 5 metres) to PC
Plant performance
Refrigeration: 280 W – 525 W * @ 4.5 K
Liquefaction: 60 l/h – 200 l/h * @ 4.5 K * with LN2-pre-cooling
Volume: ? m3
Design pressure: ? bar
Gas drier
L: ? mW: ? mH: ? m
? kg
Coldbox
Instrumentpanel
Terminalbox
Controlpanel
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MICE at RAL: Next steps
Layout: - decide which option to implement (roofed blockhouse / single shielding wall / no additional shielding) => which option does Collaboration prefer ?
- check with RAL/ISIS safety people - suggest magnetic shielding layout (based on the results of modelling)
- modify the AutoCAD drawing
Hydrogen system: - finish conceptual design - finish safety analysis - implement into the MICE layout
Cryogenic system: - finish the layout for PSI solenoid cryogenics - decide which way to go for the rest of cryogenics: dedicated cryogenic plant (new or re-use) / cryocoolers on the magnets
MICE Collaboration meeting @ RAL, 2 November 2003
Should be outcome of the AFCSWG activity