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MI Large Aperture Quad (WQB) Project Part 2 – Installation & Operation

MI Large Aperture Quad (WQB) Project Part 2 – Installation & Operation. Beams-doc #2479. AD Credits. Mechanical Support: L. Valerio, L. Nobrega, M. Albertus and the installation group Electrical Support: L. Bartelson, D. Wolff

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MI Large Aperture Quad (WQB) Project Part 2 – Installation & Operation

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  1. MI Large Aperture Quad (WQB) ProjectPart 2 – Installation & Operation Beams-doc #2479

  2. AD Credits • Mechanical Support: L. Valerio, L. Nobrega, M. Albertus and the installation group • Electrical Support: L. Bartelson, D. Wolff • Instrumentation:J. Fitzgerald, J. Crisp, R. Webber, M. Wendt, M. Olson • ES&H: D. White • Survey: T. Sager and C. Wilson and their group • MI: I. Kourbanis, B. Brown, D. Capista, M. Yang • Other Depts: B. Hendricks, D. Johnson, F. Ostiguy, P. Prieto, R. Andrews • Funded by the Proton Plan. AD/TD Seminar, Nov 2, 2006

  3. Celebration of Completion of WQBs AD/TD Seminar, Nov 2, 2006

  4. Scope of the WQB Project • To design, fabricate and bench-test 9 WQBs • To design, fabricate and bench-test 9 EXWA BPMs • To install 7 WQBs and 7 EXWA BPMs during the 2006 shutdown (the rest for spares) • To install 7 trim coil power supplies • To commission the WQBs and new BPMs AD/TD Seminar, Nov 2, 2006

  5. Location of WQBs Q101 Q222 Q620 Q608 Q222 Q522 Q321 Q402 AD/TD Seminar, Nov 2, 2006

  6. WQB, New BPM and the Old Quads AD/TD Seminar, Nov 2, 2006

  7. IQE wide BPM to be replaced IQE wide BPM to be replaced IQE wide BPM to be replaced IQE wide BPM to be replaced AD/TD Seminar, Nov 2, 2006

  8. IQG wide BPM to be replaced LAM IQB normal BPM to be replaced IQB normal BPM to be replaced AD/TD Seminar, Nov 2, 2006

  9. De-magnetize Cone Welding (L. Valerio) • Lessons from LEP (CERN) and DESY3 (DESY) in early ‘90s • All transition pieces were heat treated before installation • Before heat treatment: μ(weld) = 1.10 ~ 1.15 • After heat treatment: μ(weld) < 1.01 AD/TD Seminar, Nov 2, 2006

  10. BPM 101 (EXWA 01, WQB 001) AD/TD Seminar, Nov 2, 2006

  11. BPM 222 (EXWA 07, WQB 007) AD/TD Seminar, Nov 2, 2006

  12. BPM 321 (EXWA 08, WQB 006) AD/TD Seminar, Nov 2, 2006

  13. BPM 402 (EXWA 04, WQB 004) AD/TD Seminar, Nov 2, 2006

  14. BPM 522 (EXWA 02, WQB 003) AD/TD Seminar, Nov 2, 2006

  15. BPM 608 (EXWA 05, WQB 005) AD/TD Seminar, Nov 2, 2006

  16. BPM 620 (EXWA 06, WQB 002) AD/TD Seminar, Nov 2, 2006

  17. Electron Probe downstream from Q521 (IQE) Electron probe AD/TD Seminar, Nov 2, 2006

  18. WQB Field Quality Requirements • Large good field region: ± 2” (an increase of ±10 mm) • Small tracking error throughout the cycle: integrated field error w.r.t. IQB < 10 units (0.1%) Estimate of lattice perturbation AD/TD Seminar, Nov 2, 2006

  19. Relative Strength Difference between WQB and IQB Due to stronger hysteresis Due to higher saturation AD/TD Seminar, Nov 2, 2006

  20. WQB Hysteresis (upramp) AD/TD Seminar, Nov 2, 2006

  21. IQB310 Hysteresis (upramp) AD/TD Seminar, Nov 2, 2006

  22. Hysteresis Difference between WQB and IQB AD/TD Seminar, Nov 2, 2006

  23. Relative Strength Difference between WQB and IQB Including Hysteresis Effect (reset at 150A) AD/TD Seminar, Nov 2, 2006

  24. Trim Current with & w/o Hysteresis Effect AD/TD Seminar, Nov 2, 2006

  25. Trim Current Anomaly (M. Tartaglia) AD/TD Seminar, Nov 2, 2006

  26. Required Trim Current Setting Including Hysteresis and Anomaly Effects AD/TD Seminar, Nov 2, 2006

  27. Trim Coil & Power Supply (L. Bartelson) AD/TD Seminar, Nov 2, 2006

  28. WQB Trim Current Table AD/TD Seminar, Nov 2, 2006

  29. WQB Trim Current Plot AD/TD Seminar, Nov 2, 2006

  30. EXWA BPM (L. Valerio, J. Fitzgerald) • Electrode ID = 5.625” • Extended angle = 60 • Installation specs: • Offset (relative to the quad center) < 5 mils (0.13 mm) • Roll < 1 (17 mrad) AD/TD Seminar, Nov 2, 2006

  31. New BPM Requirements • Each new EXWA BPM measures both H and V. • Need new scaling to translate decibels to mm. • Need new offset table for database. • Horizontal beam position: pos = BPM reading + bpm_offset – survey_offset + orbit_offset – electrical_offset • Vertical beam position: pos = BPM reading + bpm_offset + survey_offset – electrical_offset AD/TD Seminar, Nov 2, 2006

  32. New Scaling 1. Analytic: (Chou, ANL/APS/IN/ACCPHY/89-3, 1989) A = constant R = pickup radius = 0.5 x 5.625” = 71.4375 mm x = difference / sum = [10^(A/20) – 10^(B/20)] / [10^(A/20) + 10^(B/20)] 2. Webber’s empirical 5th order polynomial (beams-doc #2280):

  33. Fitting to Raw Data in beams-doc #2007 Horizontal AD/TD Seminar, Nov 2, 2006

  34. Fitting to Raw Data in beams-doc #2007 Vertical AD/TD Seminar, Nov 2, 2006

  35. Hendricks Offset Table • Established 8 years ago in 1998 • survey_offset from Thornton Murphy(missing: 522, 523, 602-608, 619, 620) • bpm_offset and electrical_offset from Jim Crisp • orbit_offset from Dave Johnson

  36. New survey_offset (T. Sager) • Offset of the BPM mechanical center relative to the WQB center • Sign convention: • Horizontal: + pointing inward (namely, facing the proton direction, the left-hand-side is positive) • Vertical: + pointing upward • Roll: + indicating clockwise roll relative to proton direction AD/TD Seminar, Nov 2, 2006

  37. New bpm_offset (J. Fitzgerald) • Offset between the BPM mechanical and electrical center • Calculated using Fitzgerald’s raw data in #2007 • Sign convention: • Horizontal: + pointing outward (namely, facing the proton direction, the right-hand-side is positive) • Vertical: + pointing upward AD/TD Seminar, Nov 2, 2006

  38. New electrical_offset (R. Webber) • Offset from cables and other electronics • All long cables were measured and documented in beams-doc #2288. • Other electronics should have no contribution: • Upstairs new electronics are calibrated to zero gain difference • Combining box and the short cables are believed to have negligible contribution • Correction is done by multiplying A signal by the respective values in this listing

  39. Lattice Measurement • 1-bump - Closed Orbit Displacement from a single dipole kick: • 3-bump ratio: Tune: (x) = 26.42, (y) = 25.44 @ 8.889 GeV/c: B = 29.65 T-m Steering magnet strength (T-m/A): x = 0.007157, y = 0.003166

  40. Beta Function Measurement Change the jth steeringmagnet’s current by Ij and measure closed orbit change xjat the jth BPM: Tune: (x) = 26.42, (y) = 25.44 @ 8.889 GeV/c: B = 29.65 T-m Steering magnet strength (T-m/A): x = 0.007157, y = 0.003166 Measured closed orbit matrix diagonal element (m/A)

  41. 3-Bump: Prediction vs. Measurement

  42. Reference Closed Orbit (H) AD/TD Seminar, Nov 2, 2006

  43. Reference Closed Orbit (V) AD/TD Seminar, Nov 2, 2006

  44. Reference Closed Orbit at WQBs BPM H402 (EXWA04) Calibrated Error between Raw Data and Polynomial Fit

  45. 1-Bump Difference Orbit: V101 – 0.25 A AD/TD Seminar, Nov 2, 2006

  46. 1-Bump Difference Orbit: V101 – 0.5 A AD/TD Seminar, Nov 2, 2006

  47. 1-Bump: Prediction vs. Measurement (I > 0)

  48. While 3-bump measurements were in agreement with the lattice model, 1-bump results were less satisfactory. • A plausible explanation is the cancellation of errors when three CODs are summed up for 3-bump. In other words, 1-bump is more sensitive to errors. • Large discrepancy observed at HP620 needs further investigation. AD/TD Seminar, Nov 2, 2006

  49. 1-Bump: Prediction vs. Measurement (I < 0)

  50. AD/TD Seminar, Nov 2, 2006

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