1 MICE at RAL MICE Collaboration meeting @ RAL, 2 November 2003 Elwyn Baynham, Tom Bradshaw, Iouri...

1

MICE at RAL

MICE Collaboration meeting @ RAL, 2 November 2003

Elwyn Baynham, Tom Bradshaw, Iouri Ivaniouchenkov, Tony Jones, Jim Rochford

Engineering Department, RAL

2

Scope of presentation

• Layout

• Infrastructure : Hydrogen system

• Infrastructure : Cryogenic system

• Next steps


3

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

4

MICE layout : Experimental hall


View upstream the beam

View downstream the beam

5

MICE magnetic shielding


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


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

8

MICE Layout Version: 28 October 2003


9

MICE Layout Version: 28 October 2003



cellar

1 m

services zone


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


cellar

1 m

services zone


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


MICE layout : Questions

Can we run MICE without access into the experimental hall ?

13

Hydrogen system: Conceptual points


• 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

14

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 ?)


15

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 ?



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


Node 1

Node 2

Node 3

Node 4

Node 5


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 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


Chiller/ heaterunit

Node 1

Node2

Node 3

Node 4

Node 5

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Hydrogen system layout: Option with a hydrogen tank


Hydrogen storage tank

H2 absorber


H2 buffertank


H2

Storage unit

Ventilation duct

Radiationshieldingwall

H2

Buffer Tank

(1m3 approx)

H2 absorber

Vacuum jacket

Hydrogen system layout: Option with a metal hydride unit

20

Hydrogen system layout: Option with a hydrogen bed


21

MICE Cryogenic System Design

Tom Bradshaw

Iouri Ivaniouchenkov

Elwyn Baynham MICE Meeting October 2003

22

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)

27

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.

28

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

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


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)


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


Should be outcome of the AFCSWG activity

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1 MICE at RAL MICE Collaboration meeting @ RAL, 2 November 2003 Elwyn Baynham, Tom Bradshaw, Iouri...

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