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Status of infrastructureStatus of infrastructure

MICE Video Conference, August 17, 2005

Yury Ivanyushenkov

Applied Science Division,Engineering and Instrumentation Department

RAL

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• Magnetic shielding in the MICE hall

• MICE hall preparations

• Support system overview

• Spectrometer solenoid support

Scope

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Magnetic shielding in the MICE hall

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Magnetic field should not exceed 5 gauss in a public area (ISIS control room).

Magnetic modelling predicts that the 5 gauss line is outside the MICE hall – passive shielding may have to be used.

MICE fringe fields: Problem

Volume in blue: 1000 gauss field

Volume in orange: 5 gauss field

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Fringe fields: Passive magnetic shielding

Flux lines from unshielded coils (MICE Stage 6)

Flux lines from shielded coils with a cylindrical, 10 mm thick steel shield, D=10m.

2d axi-symmetric model of iron shield

20 mm

r =4 m

Coil axis

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Magnetic shielding: Thickness

00.00050.001

0.00150.002

0.00250.003

0.00350.004

0.00450.005

0.00550.006

0.00650.007

0.0075

4.5 4.7 4.9 5.1 5.3 5.5

Field radially at Z=0 (m)

Bm

od (

T)

No shielding

10mm

5mm

3mm

5 gauss

Field detail in the shield region for the different thickness of steel cylinder modelled.

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Coil axis

20 mm8 m

8 m

20 m

3d rectangular model of iron shield8 m

3d rectangular model of iron shield top half only

Coil axis

20 mm4 m

20 m

3d rectangular model of iron shield extended to ground level

2d axi-symmetric model of iron shield

20 mm

r =4 m

Coil axis

MICE magnetic shield: Models

Coil axis

20 mm6 m

20 m2 m

8 m

By Jim Rochford

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BH curve for iron as used in the models

0

5000

10000

15000

20000

25000

0 500 1000 1500 2000

H(Oe)

B(g

)

MICE magnetic shields: Iron

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3d model of complete rectangular shield Bpeak=0.67T

MICE magnetic shield: Complete rectangular shield

5 gauss line

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3d model of ½ a rectangular shield Bpeak=0.93T

5 gauss line

MICE magnetic shield: Half of a rectangular shield

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3d model of a rectangular shield extending to floor Bpeak=0.82T

5 gauss line

MICE magnetic shield: Extended half of a rectangular shield

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Peak field in shield for different models

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

3950 3960 3970 3980 3990 4000 4010 4020 4030 4040 4050

distance along x at y=1 z=1375 (mm)

Bm

od (T

)

3d rectangular tube

3d 1/2 rectangular tube

3d rectangular tube extended to ground

2d cylindrical tube

MICE magnetic shield: Peak field in shield

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Effect of the presence of the shield on the axis field

MICE Collaboration meeting @ Columbia, 14 June 2003

MICE magnetic shield: Effect on the axis field

-4

-3

-2

-1

0

1

2

3

4

5

6

0 1000 2000 3000 4000 5000 6000

Fiel

d (T

)

-4

-2

0

2

4

6

8

Diff

eren

ce (g

auss

)

With 20mm thick iron shieldNo shieldDifference (gauss)

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Top Fx=0,Fy=-1470,Fz=0

1470N

150N

1330N

Z X

Y

MICE magnetic shield: Forces

Sides

Fx=(+/-)1330,

Fy=-150,

Fz=0

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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

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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

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• 2d and 3d models agree well

• Can effectively contain 5 gauss line within hall by using a 20mm thick rectangular shield.

• Initial calculations of the forces on the shield are small

• The field has a very small effect on the axis field

Next step:

- Create a realistic two-wall model of the shield based on the MICE layout (see next slide) and the latest version of MICE magnetic configuration;

- Check shielding efficiency ( wall thickness is a parameter).

MICE magnetic shield: Summary of modelling

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MICE magnetic shielding layout

Magnetic shielding walls

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Magnetic shielding walls

MICE magnetic shielding layout

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Magnetic shielding in the MICE hall

Conclusion:

• Preliminary modelling suggests that passive shielding of MICE will work.

• Modelling needs to be finalized.

• Magnetic shielding design needs to be completed.

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MICE hall preparations

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MICE phase I initial

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MICE phase I final

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MICE hall preparations: To-do list

1. Floor levelling:• concrete plinth at the lower floor part of the building• fill up the cellar• floor extension frame over the trench

2. Beam line radiation shielding support over the trench.

3. Staircases modification:• the staircase on the ISIS linac side of the building • the staircase on the ISIS control room side

4. Holes in the roof and the north wall:• in the roof – for ventilation ducts• in the wall – for hydrogen vents

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MICE hall preparations: To-do list (2)

5. Hydrogen system R&D area• hydrogen extract hood and vent lines• part of mezzanine floor• part of magnetic shielding wall

6. The rest of magnetic shielding walls.

7. Beam-line radiation shielding.

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MICE hall preparations: Status and plans

• General layout is completed.

• Discussion with RAL civil engineers has started -> work will be done by the external company

• Programme of hall modification is being prepared

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Support system overview

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Support structure – Layout and sequences

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Support structure - Required rail positions

MICE Stage IV MICE Stage V

Rail positions of downstream detector for Stages IV & V will overlap with final stage VI rail positions

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Support structure – Rail and Force transfer concept

Y

XZ

Magnetic force

Traverse in X on rail system to give location to +/- 2mmJack from rail and position in x-y-z to survey targets on vacuum vesselShim to blocking plates to locate in x-y-z and react forces

Module

Jacks

Rollers

Rails

Floor Plate

Y support location

Shim

Beam Axis

Survey Target

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Support structure – Super-module

Module to module joints to react forces in Z

CC/RF module with stiff support structure

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Support structure – Rail-mounting concept

Platform moves on rails

Platform is jacked from the rails

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Support structure – Force transfer concept - Y

Shimming to react vertical forces

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Support structure – Force transfer concept - Z

Shimming to react axial (Z) forces

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MICE rail system

Rails

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Concrete floor

Support structure

Dia 650Aperture in ISIS wall

1684.2

160*

1524*

Height of the beam in the MICE hall

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Module Weight, kg

AFC module 1700

RF module 4636

Radiation shield 310

Tracker module 6650(including 1200 kg of magnetic shield)

MICE support structure - Module weights

Table from Wing

Note: Table requires updating

Crane lifting capacity is 12 tonnes (two cranes joined) or 8 tonnes (one crane)

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MICE support structure – Next steps

• Revise support structure requirements/specs for full MICE - include and analyze requirements of access to every module ( collect information from all technical supervisors)

Who is doing this ?

• Suggest support structure for Stage 2 (MICE phase 1) (is it different from the one for complete MICE ?)

• Discuss revised version of support structure at RAL meeting

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Spectrometer solenoid support

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Solenoid out the beam - position

Solenoid in the beam - position

Spectrometer solenoid positions

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Spectrometer solenoid support: Next steps

• Revise support structure requirements - include and analyze requirements of access ( collect information from the technical supervisors) Who is doing this?

• Suggest support structure for spectrometer solenoid at RAL meeting

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MICE module max height

Concrete aperture

Important: The max height from the bottom of the support frame to the topof a module should not exceed 3200 mm

Concertina door

Hinged door

Max horizontal opening 3200 mm

Max vertical opening 3360 mm