MICE Radiation Shield

Design review

for the proposed

‘Direct Drive’

MICE Spectrometer

Radiation Shield

17/11/2011 Norbert Collomb

MICE Radiation Shield

Presentation layout:

1. Overview of ‘Direct Drive’ system

2. Dimensions

3. More detailed views

4. Alignment issues

5. Why Heason?

6. Proposed electrical arrangement

7. Manual Handling

8. Q & A17/11/2011 Norbert Collomb

S1

MICE Radiation Shield – Direct Drive Overview

17/11/2011 Norbert Collomb Spectrometer face plate

4 off 470mm long rail with a magnetic permeability of 1.01

“L-Shape” bracket (AL Alloy)

“L-Shape” channel (AL Alloy), reworked from existing matl.

8 off low magnetic permeability carriages with bracket (AL Alloy)

2 off non magnetic direct drive motors with AL Alloy adapter

Non magnetic end stops and limit switches

Manual Handling bracket

9-Pin D-sub feed through on KF Flange

S2

680m

m

Door open Door closed

Stroke 432mm

24.5mm Clearance

MICE Radiation Shield - Dimensions

17/11/2011 Norbert Collomb

Use existing lead shield and frame determined design for corresponding interface components.Utilising existing parts and modify these helps to keep cost down.Splitting the door system (rail and support brackets) allows for easier alignment, but reduces the option to ‘pull’ back-plate straight.All components stay clear of corners (weld seam), window flange and cable runs along entire stroke.

S3

MICE Radiation Shield – Detail View

17/11/2011 Norbert Collomb

Direct Drive Motor

Door open

Note: Cable runs not shown for clarity.

Bonded Ceramic Drive Strip

Adjustable Hard Stop

Adjustable Limit Switch

Adjustable Hard Stop

Direct Drive Motor Adaptor Plate

Door Frame Interface Bracket

Direct Drive Motor needs to be in ‘tune’ with Linear Motion system

S4

MICE Radiation Shield – Detail View

17/11/2011 Norbert Collomb

Rail detail Door closed

Carriage detail

Door Frame Interface Plate

S5

MICE Radiation Shield – Alignment Issues

17/11/2011 Norbert Collomb

Rail section approximated to 12mm wide and 11mm high

35mm

Carriage cuboids approximated to 27mm wide 17mm high and 45mm long

60mm

Back-plate is a datum feature

Back-plate distortion through welding?

56.5mm

80mm

S6

MICE Radiation Shield – Alignment Issues

17/11/2011 Norbert Collomb

Rails must be parallel to each other (top and bottom). Rotational D.o.F. may require shims. Top rail as master – bottom rail as slave configuration.

Rotational accuracy when welding back plate determines if shield needs to be driven “uphill” on opening and “downhill” on closing (or vice versa).

S7

MICE Radiation Shield – Why Heason?

Neutron ShutterHeason Technology recently delivered neutron beam modifying Jaw Packages for the WISH and Nimrod instruments at the Rutherford Appleton Laboratory ISIS Pulsed Neutron and Muon Source.The design specification for both applications called for the construction materials to be aluminium, non magnetic stainless steel or plastic. Ceramic servo motors were a natural choice for positioning each of the four blades in the Jaw package assembly. Supplied by NanoMotion, an exclusive distribution partner of Heason and with a legacy of demanding nanometre-scale positioning applications, the technology is completely non-magnetic and suits vacuum environments perfectly. Each blade was driven with two synchronised ceramic motors, configured with either 4 or 8 elements depending upon the load and force required for the Jaw Package size. A further benefit of the ceramic motor is its ability to hold and lock position with zero position shift when power is removed. See http://www.heasonmotionsolutions.com/project-gallery

17/11/2011 Norbert Collomb

S8

MICE Radiation Shield – Electrical arrangement

17/11/2011 Norbert Collomb

Limit switch D5A-2100Limit switch D5A-2100

Heason HR8-1-V-3

Heason AB1A-2-HR-E8

Control Room display (software)

Switch to open Switch to close

Light for open Light for closed

Power supply rack

Action/Interlock?

Confirmation/Position info

In vacuum (≈10-3 Torr)

<10mOR

9-Pin D-sub feed through on CF Flange

Discussion with electrical and controls department underway.

S9

MICE Radiation Shield – Manual Handling

17/11/2011 Norbert Collomb

Push – Pull rod

Should the need arise to manually open or close the shutter, the system would need to be pressurised and the CF Flange taken off. A “Push-Pull” rod is inserted and the ‘bayonet’ type end inserted into the manual handling bracket.

Manual handling bracket

“Bayonet” type connection

S10

MICE Radiation Shield – Questions and Answers

Thank you for your attention

17/11/2011 Norbert Collomb

Questions?

S11

• Looked at 3 options for Radiation shield design• Advantage – Disadvantage analysis favours Direct Drive

– Cost– Alignment issues– Potentially more reliable than other two systems (MTBF)– Ease of use– Simpler design

• Some minor issues still outstanding (Linear Motion material – long lead time, Direct Drive box < 10m from motor requirement and uncertainty of motor in harsh radiation environment.

• Accuracy of back plate welded into place – distortion, radial and linear alignment

• Manual Handling requires flange removal (pressurisation)• Can programme acceleration – Vconst – deceleration for motion

MICE Radiation Shield – Backup Slides

S12