HPD Magnetic Distortion Calibration System for RICH1 - Update 11 -

1. HPD Magnetic Distortion Calibration System for RICH1- Update 11 - Ray Mountain, Sheldon Stone Syracuse University With help from: Dave Websdale, Trevor Savidge, Gabriel Vidal, Bill Cameron, Neville Harnew, Carmelo D'Ambrosio • Outline: • Mechanics • Optics • Outstanding • Plan R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 23 Oct 2007 1

2. MECHANICAL Support (see drawings) Support design: use photon funnel itself as reference (no independent frame) Clamp down to top surface Part “A” to reference Y, use dowel pins to reference X,Z Feedthrough panel Large hole at each end, pattern of taps and o-ring/gasket Cables glued through panel without connectors Plus: hexdriver hole to access gearbox (M8 + o-ring, thrd hole) Installation procedure (see slide) Please review Questions/Issues Sent 3D CAD Please review & identify conflicts Parker stages All components in hand Sizing as expected, fits in mock-up Testing the stages Now ongoing Learn language, write code Test basic motion: Length scale, steps/mm (any calibration constants) Repeatability Using long cables Test in magnetic field (esp. limit switches) Gear box Design basically done Will test after motion tests (need to disassemble stage) R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 23 Oct 2007 2

3. SUPPORT (1) R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 23 Oct 2007 3

4. SUPPORT (2) HEXDRIVER HOLE R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 23 Oct 2007 4

5. SUPPORT (3) R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 23 Oct 2007 5

6. SUPPORT (4) MOVE DOWN 1 MM HERE R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 23 Oct 2007 6

7. INSTALLATION PROCEDURE v1 TOP ARRAY STAGE #1 Screw in front blocks (tight) Align support bar with Ph. Funnel Part “A” dowels Mate dowels, screw in (not tight) Position clamps, screw in (not tight) Reposition stage, if necessary, so that contact with surface “A-2” is solid Tighten down screws in bar and clamps alternately STAGE #2 Repeat above procedure FEEDTHRUS Feed cabling through hole in Ph. Funnel Part “B” until plate meets “B” Position O-ring (or gasket) Screw plate in place GANTRY TBD BOTTOM ARRAY STAGE #1 STAGE #2 FEEDTHRUS Repeat procedures for TOP ARRAY GANTRY TBD Installation should be fairly straightforward since can locate with dowel pins and screw down. Shouldn’t be complicated by direction of g-vector. Will try to do the same for gantry. R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 23 Oct 2007 7

8. SYSTEM DIAGRAM (1) -- MECH PH.FUNNEL F/T (x5) PC (LabVIEW/PVSS) NLS/STAGE = 2-3 LS LS LEN=30 ft (?) SERIAL LINE STAGE A MOTOR ENCODER LOC: ? SOURCE: ? CONTROLLER • Notes: • Controller syncs motors • Power remote off switch LEN=50 ft NLINES=9 MOTOR LOC: NEAR (?) LOC: PH.FUN. STAGE B POWER SUPPLY LS LS LEN=? NLINES=1 WALL LOC: MEZZ. (?) F/T (x4) NEED ONE NEED TWO SUCH SYSTEMS R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 23 Oct 2007 8

9. LIGHT SOURCE (1) Radiation damage Dose: 2.4 kRad/yr at HPDs (confirmed w Ken Wyllie) Normal digital CMOS circuits good to few (10) kRad Beneficial to have power OFF (this is the only case for us), not clear about magnitude of improvement Unknowns (bad news): Unknown dose when LHC turns on, may be orders of magnitude (pilot bunch and where it goes) Large variations even among same circuits, technology, manufacturer Strategy: Put together quickie prototype and irradiate it (FNAL?), and In parallel finish the overall design assuming everything is OK Plan for replacement boards also Electronics design Have engaged local engineering firm (Sensyr Inc.) to help with the design and manufacture (especially the controller and interface) Have several years experience working with them on various projects Redesigned LED circuit to use microcontrollers locally (more modern CMOS than registers, so more rad hard?) Help: It would be good to have an engineer review the design in general and in terms of safety R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 23 Oct 2007 9

10. RADIATION HARDNESS (1) http://lhcb-background.web.cern.ch/lhcb-background/Radiation/SUMtable2.htm http://lhcb-elec.web.cern.ch/lhcb-elec/html/radiation_hardness.htm R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 23 Oct 2007 10

11. RADIATION HARDNESS (2) http://lhcb-elec.web.cern.ch/lhcb-elec/html/radiation_hardness.htm R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 23 Oct 2007 11

12. LIGHT SOURCE (2) Optical design Optimized, using optical prototype Light levels small but OK Checked with PMT + picoammeter: Can see clear PMT photocurrent far below normal turn-on of LED (at ~0.1 mA with typical LED current 20 mA) Photon rate > MHz Spot size ~2-3 mm FWHM achievable w collimation alone Acceptable? Gantry Preliminary design SU shop work will be needed Full gantry assy later Operation Note that only certain simple patterns can be generated with this design (i.e., same row, same column, but not two diagonal LEDs) Each 5x7 matrix has same pattern Typical patterns: One LED each matrix One LED each row, all rows One LED each row, specified rows Open Questions Need to have engineer review electronics design? Spot size acceptable? Other color LEDs (now is the time) R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 23 Oct 2007 12

13. SYSTEM DIAGRAM (2) -- ELEC NPCBs = ? PC (LabVIEW/PVSS) PCB I/C BOX (Interface/Controller) “C” LEN=? USB NLED/PCB = ? MEM LOC: ? MmC LOC: PH.FUN. LEN=? NLINES=? USB PWR LOC: NEAR (?) POWER BOX LEN=? NLINES=? LOC: MEZZ. (?) WALL • Notes: • PCB = Fundamental Unit • “C” = Discrete / mC / FPGA NEED TWO SUCH SYSTEMS R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 23 Oct 2007 13

14. SCHEDULE R. Mountain, Syracuse University LHCb RICH1 Mag Cal Meeting, 23 Oct 2007 14