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Magnet Measurement Device for MICE F. Garnier, P-A. Giudici, F.Bergsma CERN

Detailed technical information on a device for precision magnet measurements in the MICE project, including components and calibration processes. Status updates on equipment procurement and readiness for AFC project.

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Magnet Measurement Device for MICE F. Garnier, P-A. Giudici, F.Bergsma CERN

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  1. Magnet Measurement Device for MICE F. Garnier, P-A. Giudici, F.Bergsma CERN MICE Collaboration Meeting No. 29 RAL technical drawings by O.Jamet

  2. Layout Rails Trolley with B-sensors ¼ pipe of aluminum Cradles Service module Tooth belt Servo motor with encoder

  3. Layout supports No support inside magnet independent of magnet shape supports

  4. Layout Detachable service module Revolving disc step size 5 degree

  5. Layout Motor with reduction gear box Outgoing shaft has encoder

  6. ¼ pipe support for rails and cradles (aluminum pipe of 400 mm Ø, L = 6m , thickness 10 mm is most difficult to find part of bench) Thickness 10 mm

  7. Service module to check calibration of B-sensors detachable If necessary determine small corrections on main terms (Y00, Y10 and angles between probes)

  8. Service module NMR-head B-sensor Turntable 2-axis

  9. Disk with 7 B-sensors calibrated at 4.5 Tesla Beam axis Tooth belt Magnet bore Rails ¼ pipe of aluminum Cradle

  10. This flange cannot be removed and cannot be surpassed by rail support Extension disk for AFC 5m version for spectrometer solenoids 2m version for focus absorber solenoids. Extension disk to by-pass internal flange AFC Need to measure from both sides 2m version could be used to measure eventually coupling coils dismountable

  11. Single-row 10 pin connector thermistor Homogeneous field region is small => need high density => single row connector Glass cube with 3 Hall probes B-sensor card Stack of B-sensors in calibrator Double row flat- cable connector SPI-interface front back Passive backplane for B-sensor to carry double-row connector Daisy chain B-sensors

  12. Calibration done at GHMFL Grenoble M5 max 13 Tesla 5 MW 130 mm IMMW15 F.Bergsma

  13. Mounting of B-sensors

  14. Target support for survey

  15. Measurement grid Disk can be rotated in steps of 5 degree 180 mm sensor has to be removed for this region

  16. Pin holes made by CNC machine

  17. Strategy mechanics: 1 build 5 m version , test precision with laser tracker 2 if precision insufficient add encoder and rack and/or foresee laser tracker during measurements etc 3 build 2 m version DAQ: Build simple read-out for 7 B-sensors Anticipate to have interface outside high field region Accuracy: < 0.5 mm longitudinal +/- 0.5mm radial Theta +/- 1 mrad Bx,By,Bz +/- 2 mT Check in situ with NMR on service module

  18. Status 6 m Alu pipe of 40 cm bore arrived, segment cut, principle seems to work Cradles: designed, will be produced outside CERN, rectified inside CERN Rails: ordered , will arrive in one month Chariot: designed, must be build Motion: standard BALDOR motion controller, drive and motor (available) Maybe encoder on rack (unlikely), encoder exist, rack must be ordered B-sensors ready and calibrated Read-out: basics exist ( used in calibrator with 4 cards), parts exist duplicate electronics board should be send to CERN ! Ready at August 2011 for AFC (small version)

  19. Spare slides

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