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MICE Radiation Shield Design review for the proposed ‘Direct Drive’ MICE Spectrometer Radiation Shield 17/11/2011Norbert Collomb.

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Presentation on theme: "MICE Radiation Shield Design review for the proposed ‘Direct Drive’ MICE Spectrometer Radiation Shield 17/11/2011Norbert Collomb."— Presentation transcript:

1 MICE Radiation Shield Design review for the proposed ‘Direct Drive’ MICE Spectrometer Radiation Shield 17/11/2011Norbert Collomb

2 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 & A 17/11/2011 Norbert Collomb S1

3 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 mat l. 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

4 680mm 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

5 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

6 MICE Radiation Shield – Detail View 17/11/2011 Norbert Collomb Rail detail Door closed Carriage detail Door Frame Interface Plate S5

7 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

8 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

9 MICE Radiation Shield – Why Heason? Neutron Shutter Heason 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 17/11/2011 Norbert Collomb S8

10 MICE Radiation Shield – Electrical arrangement 17/11/2011Norbert Collomb Limit switch D5A-2100 Heason HR8-1-V-3 Heason AB1A-2-HR-E8 Control Room display (software) Switch to openSwitch to close Light for open Light for closed Power supply rack Action/Interlock? Confirmation/ Position info In vacuum (≈10 -3 Torr) <10m OR 9-Pin D-sub feed through on CF Flange Discussion with electrical and controls department underway. S9

11 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

12 MICE Radiation Shield – Questions and Answers Thank you for your attention 17/11/2011 Norbert Collomb Questions? S11

13 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 – V const – deceleration for motion MICE Radiation Shield – Backup Slides S12


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