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MICE Radiation Shield

MICE Radiation Shield . Design review for the proposed ‘Direct Drive’ MICE Spectrometer Radiation Shield. 17/11/2011 Norbert Collomb. S1. MICE Radiation Shield . Presentation layout: Overview of ‘Direct Drive’ system Dimensions More detailed views Alignment issues

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MICE Radiation Shield

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

  2. S1 MICE Radiation Shield Presentation layout: Overview of ‘Direct Drive’ system Dimensions More detailed views Alignment issues Why Heason? Proposed electrical arrangement Manual Handling Q & A 17/11/2011 Norbert Collomb

  3. S2 MICE Radiation Shield – Direct Drive Overview 4 off 470mm long rail with a magnetic permeability of 1.01 “L-Shape” channel (AL Alloy), reworked from existing matl. 9-Pin D-sub feed through on KF Flange 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 “L-Shape” bracket (AL Alloy) Manual Handling bracket Spectrometer face plate 17/11/2011 Norbert Collomb

  4. S3 MICE Radiation Shield - Dimensions 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. Stroke 432mm Door closed Door open 680mm 24.5mm Clearance 17/11/2011 Norbert Collomb

  5. S4 MICE Radiation Shield – Detail View Adjustable Hard Stop Adjustable Hard Stop Adjustable Limit Switch Bonded Ceramic Drive Strip Direct Drive Motor Direct Drive Motor Adaptor Plate Door open Door Frame Interface Bracket Note: Cable runs not shown for clarity. Direct Drive Motor needs to be in ‘tune’ with Linear Motion system 17/11/2011 Norbert Collomb

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

  7. S6 MICE Radiation Shield – Alignment Issues Rail section approximated to 12mm wide and 11mm high Carriage cuboids approximated to 27mm wide 17mm high and 45mm long Back-plate distortion through welding? 56.5mm Back-plate is a datum feature 80mm 35mm 60mm 17/11/2011 Norbert Collomb

  8. S7 MICE Radiation Shield – Alignment Issues Rotational accuracy when welding back plate determines if shield needs to be driven “uphill” on opening and “downhill” on closing (or vice versa). 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. 17/11/2011 Norbert Collomb

  9. S8 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 http://www.heasonmotionsolutions.com/project-gallery 17/11/2011 Norbert Collomb

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

  11. S10 MICE Radiation Shield – Manual Handling 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 Push – Pull rod 17/11/2011 Norbert Collomb

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

  13. S12 MICE Radiation Shield – Backup Slides • 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

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