HPD Magnetic Distortion Calibration System for RICH1 - Update -

1. HPD Magnetic Distortion Calibration System for RICH1- Update - Ray Mountain, Sheldon Stone Syracuse University With help from: Dave Websdale, Trevor Savidge, Gabriel Vidal, Bill Cameron, Neville Harnew • Outline: • 2D vs 1D Mapping • Dimension Specs • Vendor Responses • Open Questions R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 02 Feb 2007 1

2. 2D vs 1D MAPPING (C) (A) (B) • 2D with Point Source • Move point light source like (A), in both X and Y • Fine scan at zero field and full field level • 1D with Line Source • Will allow for a more spatially compact system • Move a light source like (B), in X only • Turn on N selected fibers each pass (avoid confusion with pattern reco) • Mimics 2D point source – this not a grid strategy, but still is a direct mapping strategy in which Y has a “fixed” step size (gives LUT) • Make multiple passes at each field value • Scan at several field levels during ramp • Toy MC Simulation • Have rudimentary simulation in place • Studying this procedure: find what the “fixed” step size should be, in order to pattern recognize pixel edges; and find N -OR- Columns can be staggered to decrease effective pitch between spots Multiple fibers, for redundancy X 1st scan 2nd scan R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 02 Feb 2007 2

3. DIMENSIONS (1) These dimensions were distributed to vendors as specs this page and next Purpose: to give vendors constraints, but … not to detail for them the constraints on cross-sectional area (next page), at least not at this stage Need to cross-check these TOP VIEW (after original dwg by Trevor) CIRCLES INDICATE AREAS TO BE SCANNED OUTER BORDER INDICATES MAX PHYSICAL EXTENT OF XY STAGE (EXCLUDING CABLES) SPACING AROUND PERIMETER ALL DIMENSION ARE IN MM R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 02 Feb 2007 3

4. DIMENSIONS (2) SIDE VIEW (DETAIL) (after original dwg by Trevor) MAXIMUM AVAILABLE CROSS-SECTIONAL SPACE IS AS SHOWN, BUT THIS REGION WILL CONTAIN MECHANICAL SUPPORTS WHICH ARE YET TO BE FINALIZED (THE SIZING OF THESE IS STILL NEGOTIABLE) ALL DIMENSION ARE IN MM R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 02 Feb 2007 4

5. VENDOR RESPONSES • Positive Responses from: • Parker (Daedel/Bayside), Velmex, Nook • Mostly Rejection: • Aerotech, Oriel, IMS Intelligent Motion Systems, OES Motion Control, Techno Linear, ACS Advanced Control Systems, Allied Control, Compumotor, others… • Due to: overall dimension too large, or spatial constraints too tight • Still outstanding: • Newport R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 02 Feb 2007 5

6. PARKER / DAEDEL • 2D System: • Unwilling to bid with these size constraints (too long to be stiff for this cross section) • May be able to surgically alter one of the LP28 or HD404XR (shown previously), to reduce size and reinforce stiffness • 1D System: • LP28 + matching “Idler” (linear rail) • Short side of array, will require a long arm carrying the linear light source • Issues: • Need to increase travel. (Investigating…) • Worried about moment loading. (Investigating…) • Plastic nut (bearing on truck) radiation damage? (Investigating…) • Grease on screw R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 02 Feb 2007 6

7. VELMEX • 2D System: • Smallest they have is big, and… would have to completely gut the thing to get it to fit – not really possible with this design (wedge-shaped car uses body as rail) • However, not finished interrogating the vendor, can still press for smaller extrusion • 1D System: • Open frame (just bottom of frame) • Short side of array (longest of this type) • Issues: • Also need to increase travel – can mount motors off to the side • Will substitute NASA-style materials (plastics) for radiation damage X-Slide (1D) BiSlide (2D) R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 02 Feb 2007 7

8. NOOK • 2D System: • Just actuator (not including motor), will have to spec motor separately • Two-motor, belt-driven, all custom • 1D System: • Similar dimensions (no motor) • One motor, screw-driven, all custom • Short side of array • Issues: • Good source for components • Have to determine resolution • Can increase travel by decreasing carriage size R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 02 Feb 2007 8

9. VENDOR SUMMARY • So • Most promising systems are 1D stages, which instrument the short dimension, and require a long cross-bar for the light source which is stiff • On Our Own? • So, none of these vendors have come up with a design which sufficiently fulfills our specs: either form factors are too big or travel too small, given overall size constraints • One recourse then is to design our own system, starting if we can from a commercially-available system or at least commercial components. We could of course use more space… • Would probably concentrate on 1D system, instrumenting the long dimension instead of the short one, and concentrate on increasing the travel. • Have some ideas as to how to do this, from discussions with the vendors. R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 02 Feb 2007 9

10. OPEN QUESTIONS Can we fit any of these? Parker LP28 or Nook EG – both have form factors about 30 x 30 mm2 Please cross-check the above specified dimensions For overall size, etc. If new 3D model, that would be helpful Can increase travel if: Let the motor stick out one end, or at the side of one of the photon funnel walls – probably not possible? Use “parallel” arrangement with motor on side of slide – but this may not gain as much as it seems at first. Investigating… Decrease length of carriage, for some models Can decrease form factor if: Redesign carriage, for some models Machine away part of body (but must be mindful of retaining stiffness) Other vendors to contact? Any suggestions Light source design: Switching on/off different fibers Focusing multiple components, etc. Is there a map of “important” photons? Defining regions that we could possibly occlude if we had to, or not calibrate as well? — How to proceed? Finish iterating with vendors Send their best design to Trevor to check against 3D model, and he can respond by pointing out the problematic areas. (use a step file?) Modify it or design own system Iterate with Trevor for final decision Meet in ~2 weeks to settle this (Also work on light source design) R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 02 Feb 2007 10