Transcript Document

MICE at RAL
Elwyn Baynham, Tom Bradshaw, Iouri Ivaniouchenkov, Tony Jones, Jim Rochford
Engineering Department, RAL
MICE Collaboration meeting @ RAL, 2 November 2003
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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 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
MICE Collaboration meeting @ RAL, 2 November 2003
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MICE layout : Experimental hall
View upstream the beam
View downstream the beam
MICE Collaboration meeting @ RAL, 2 November 2003
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MICE magnetic shielding
Revised 3D model:
Open ended rectangular box model
20mm thick iron plate
+
Two 150mm thick iron plates
ID 40mm OD 3.6m
6m
2m
17m
5.6m
3.8m
MICE Collaboration meeting @ RAL, 2 November 2003
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MICE magnetic shielding
For 200Mev/c,
beta 43cm - mode
Fringe field on outer walls
200MeV/c beta 43cm
Shield components
Top+sides+detector
Top+sides
Sides+detector
No shielding
MICE Collaboration meeting @ RAL, 2 November 2003
Outer surface of
ISIS injector wall
Bmod (g)
0.8
0.72
0.71
1.78
Outer surface of
Control room wall
Bmod (g)
2.23
2.33
2.39
12.5
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MICE Layout
Option: MICE restricted area is inside a roofed blockhouse
Exit
cold box
Door
Path way >= 0.8 m
Sliding
lead
door
3.8 m
Main gate
Sliding lead door
stay clear zone
cellar
door
Bridge
5.6 m
services zone
Door
High level exit
Concrete radiation shielding
MICE Collaboration meeting @ RAL, 2 November 2003
Steel magnetic shielding
Scale:
1m
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MICE Layout
MICE Collaboration meeting @ RAL, 2 November 2003
Version: 28 October 2003
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MICE Layout
MICE Collaboration meeting @ RAL, 2 November 2003
Version: 28 October 2003
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MICE Layout
Option: MICE restricted area in the hall is separated with a single shielding wall
Exit
cold box
Main gate
door
Sliding lead door
3.8 m
stay clear zone
cellar
door
5.6 m
services zone
door
High level exit *
* Door is normally blocked when MICE is running
Concrete radiation shielding
MICE Collaboration meeting @ RAL, 2 November 2003
Steel magnetic shielding
Scale:
1m
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MICE Layout
Option: All the hall is a MICE restricted area
Exit *
Main gate *
cold box
door
3.8 m
stay clear zone
cellar
door
services zone
5.6 m
High level exit *
* All
Concrete radiation shielding
MICE Collaboration meeting @ RAL, 2 November 2003
doors are normally blocked when MICE is running
Steel magnetic shielding
Scale:
1m
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MICE layout : Questions
Can we run MICE without access into the experimental hall ?
MICE Collaboration meeting @ RAL, 2 November 2003
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Hydrogen system: Conceptual points
• Closed system concept :
Safety pros:
- 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;
Ideally it is a truly passive system
- pressure in the system is always higher than the
atmospheric pressure.
Air can not leak inside the system
• Individual hydrogen system for each
absorber
MICE Collaboration meeting @ RAL, 2 November 2003
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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Hydrogen flow and safety system
Version: 09/06/2003
(option with a hydrogen tank)
VP
P
P
He Purge
system
Node 1
Vent outside
flame arrester
Hydrogen tank
Volume: about 30 m3
1.6 bar abs > Pressure > 1.1 bar abs
14 K He
from Cold box
Node 5
Hydrogen module enclosure
18 K He
to Compressor
via Radiation shield
X2
Fill valve
P
P
X2
H2 Gas bottle
1.7 bar
P
2.1 bar
Liquid level gauge
Vent valve
P
H2 Detector
Vacuum
Ventilation
system
H2 Detector
Internal Window
Vent outside
flame arrester
LH2 Absorber
Node 2
70 K Safety window
H2 Detector
P
Vent valve
LHe Heat
exchanger
Vent outside
flame arrester
Node 3
Evacuated vent
buffer tank
Vacuum vessel
Node 4
VP
VP
P
Pressure
gauge
P
Pressure
regulator
MICE Collaboration meeting @ RAL, 2 November 2003
Valve
Pressure
relief valve
Non-return
valve
Bursting disk
VP
Vacuum pump
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Hydrogen flow and safety system
Version: 06/08/2003
(option with a metal hydride storage unit)
VP
Metal hydride hydrogen
storage unit
(20 m3 capacity)
P
P
He Purge
system
Vent outside
flame arrester
Node 1
14 K He
from Cold box
Chiller/ heater
unit
18 K He
to Compressor
via Radiation shield
X2
Fill valve
P
P
X2
Node 5
Hydrogen module enclosure
1.7 bar
P
H2 Gas bottle
2.1 bar
Liquid level gauge
Vent valve
P
H2 Detector
Vacuum
Ventilation
system
H2 Detector
Internal Window
Vent outside
flame arrester
LH2 Absorber
Node2
70 K Safety window
H2 Detector
P
Vent valve
LHe Heat
exchanger
Vent outside
flame arrester
Node 3
Evacuated vent
buffer tank
Vacuum vessel
Node 4
VP
VP
P
Pressure
gauge
P
Pressure
regulator
MICE Collaboration meeting @ RAL, 2 November 2003
Valve
Pressure
relief valve
Non-return
valve
Bursting disk
VP
Vacuum pump
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Hydrogen system layout: Option with a hydrogen tank
Hydrogen storage tank
H2 absorber
H2 buffer
tank
Concrete radiation shielding
MICE Collaboration meeting @ RAL, 2 November 2003
Steel magnetic shielding
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Hydrogen system layout: Option with a metal hydride unit
Ventilation duct
H2 absorber
Radiation
shielding
wall
Vacuum jacket
H2
Storage
unit
MICE Collaboration meeting @ RAL, 2 November 2003
H2
Buffer
Tank
(1m3 approx)
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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
Note that we may need to
run with Helium in the
absorbers (TBC)
Component list
Item
14K
4K (Watts)
Absorbers
All sources
150
e-mail from MAC
Transfer lines
41
27.4
M Green estimate
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
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Magnet shield cooling
Summary
A Bross e-mail
Total W
257.00
78.60
Equivalent 4.4K
80.77
78.60 (Total = 159.4W)
Grand total
159.4
Contingency
30%
Budget for
207.18Watts
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Cryogenic System
Basic Layout
Spectrometer
Gas Store
SciFi Detector
Absorber/Focus
Compressors
14K
4K
Return
Coupling
4K
Cold box
Control dewar
Absorber/Focus
14K
Coupling
Note that we need 14K for
hydrogen absorbers
Layout assumes that we can
use 14K for shield cooling
Absorber/Focus
Etc….
Spectrometer
Valve box
Gate valve
Powered valve
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Relief Valve
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
Dates are approximate …..
Spring
2006
2007
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Refrigerator power
Refrigeration power W
600
500
400
No LN2
With LN2
Margin
No Margin
300
200
100
0
40
TCF 50 Refrigerator
power (Linde)
45
50
55
60
65
70
75
Gas flow g/s
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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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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
Proposal
Beam-line SC solenoid
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Revised
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MICE:
Magnets
40
Absorbers
100
SciFi detectors
150
Extra for absorbers with LHe 53
-------Sub-total: 343
60
60
40 (7:1 option)
53
------213
Total
+ 30 % margin
248
322
MICE Collaboration meeting @ RAL, 2 November 2003
378
500
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LINDE Helium liquefier/ refrigerator TCF20
Cold box with integrated purifier
Dimensions:
1985 mm(L)×1100mm(W)×2227mm(H)
Weight:
1280 kg approx
Utility requirements:
Power :
400 V / 50Hz / 3 phase / 3kW
Cooling water: 0.4 m3/hour, 3-6 bar, 10-25 °C,
closed
cycle is preferred
Helium gas: Helium Grade A (99.996 Vol%)
LN2 consumption: 0.8-1 ltr/ltr LHe, saturated
liquid
Plant performance
Liquefaction capacity:
without LN2 pre-cooling
18 / 30 / 37 litres/hour
( compressor: DSD141/201/241)
with LN2-pre-cooling
Control system
Oil injected screw compressor
Type: SIEMENS SIMATIC S7-300
with a SIMATIC OP270-6’’ operator panel
(for a stand-alone control and monitoring)
Model: KAESER DSD201/241
Motor: 110/132 kW
Dimensions: 2.23 m(L)×1.96 m(W)×1.86 m(H)
Weight: 3300/3400 kg
Operating system: S7
(runs on Windows 95 and higher)
Utility requirements:
Power: 400 V/ 50 Hz / 3 phase/ ? kW
Water (for water cooled type): 6.7-8.1 m3/hour
Air (for air cooled type): 14000-21000 m3/hour
Oil removal system
Pressure control panel
L: 0.7 m
W: 0.8 m
H: 2.4 m
Remote monitoring an control:
via MPI interface (up to 5 metres) to PC
Recovered helium gas drier
L: 0.8 m
W: 0.42 m
H: 0.8 m
L: 0.3 m
W: 0.3 m
H: 1.9 m
50 kg
75 kg
200 kg
MICE Collaboration meeting @ RAL, 2 November 2003
36 / 57 / 78 litres/hour
( compressor: DSD141/201/241)
Pure gas buffer vessel
Volume: 3 – 8 m3
(for liquefaction rate: 30-75 ltr/hour)
Design pressure: -1/+16 barg
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LINDE Helium liquefier/ refrigerator TCF50
Cold box with Instrument panel and Terminal box
Plant performance
Dimensions:
2400 mm(L)×1900mm(W)×3270mm(H)
Weight: 2600 kg approx
Instrument
panel
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,
Cold
box
Terminal
box
Control
panel
Refrigeration:
280 W – 525 W * @ 4.5 K
Liquefaction:
60 l/h – 200 l/h * @ 4.5 K
* with LN2-pre-cooling
Helium gas: Helium Grade A (99.996 Vol%)
Control system
Oil injected screw compressor
Type: SIEMENS SIMATIC S7-400
with a SIMATIC OP270-10’’ operator panel
(for a stand-alone control and monitoring)
Model: KAESER ESD 351-50
Motor: 200 kW
Dimensions: 2.65 m(L)×2.2 m(W)×2.2 m(H)
Weight: 4900 kg
Operating system: S7
(runs on Windows 95 and higher)
Utility requirements:
Power: 214 kW
Water : 18 m3/hour
Air :
4 m3/hour
Oil removal system and Gas management panel
L: 1.4 m
W: 1.3 m
H: 2.5 m
Remote monitoring an control:
via MPI interface (up to 5 metres) to PC
Gas drier
L: ? m
W: ? m
H: ? m
Pure gas buffer vessel
Volume: ? m3
Design pressure: ? bar
? kg
? kg
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MICE Collaboration meeting @ RAL, 2 November 2003
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
Should be outcome of the
AFCSWG activity
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
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