Beams Division Seminar Configuration Management in the Tevatron – Alignment Ray Stefanski

1. Beams Division Seminar Configuration Management in the Tevatron – Alignment Ray Stefanski March 6, 2003

2. CM focuses on controlling outcomes. CM controls change, making sure that its impact is assessed and that every effort is made to prevent erosion of functionality or safety. Configuration Management Applies to any complex system, but we will concentrate today on Tevatron magnet alignment and stability.

3. Organization • I would like to discuss alignment roughly along • chronological lines, beginning last Summer when I • first got involved. Our baseline dates to 1995. • We will cover: • Data base development. • Elevations. • Roll measurements. • Continuous elevation monitors. • Smart Bolt measurements. • Summary

4. Contributors: Bruce Hanna Jim Volk Bob Bernstein Terry Sager George Wojcik AMG Chuck Brown Mike Church Andrey Chupyra Vladimir Shiltsev Mike Syphers MCR Dave Augustine Mechanical Techs Don Edwards Todd Johnson Duane Plant Jim Williams Dave Harding Bruce Brown John Carson Jamie Blowers Ray Hanft Hans Jostlein Crag Moore Aimin Xiao Jean Slaughter Dave Ritchie Norm Gelfand

5. Quad Elevations from GW 1995

6. Mike Syphers

7. Murphy Line

8. Computer works The Murphy-line differs from the “ideal.” At each station, the difference is about 10 mils. The accumulated beam-offset after one sector is >250 mils. We might take this seriously, if we knew where the Murphy-line was.

9. BD Development • We’re working on a PC RIM DB for magnetic • field data. We would like to combine this with • Alignment data in the same DB. • We want to monitor corrector magnet settings • more closely to follow changes as they occur • from store to store. Use of SDA.

10. Elevations A14-1 may be an example. A1 under repair today. The Tevatron now has a vertical network, tied to the Lab coordinates.

11. B-sector with more data B15-1 B16-1 B17-1

12. Some history of B16-1 and its neighbors. Elevation of B16-1 is 40.76” measured on 11/19/02. • Memo dated 05/24/99 Mike Church to • Alignment Group: • Elevation of B-16-1 increased from 40.387” • to 40.443” on 05/25/99. • Elevation of B-16-1 increased • to 40.541” on 03/15/00. • US of D-15-5 changed to 40.517”. Thanks to Terry Sager.

13. Aperture Scan 01/07/03 Typical Tev apertures: Quad 3 inch Dipole 2.7 inch C0 lambs ~1 inch B16-1 = 1.36 inch Aperture Scan looks ok! Thanks to Dan Bollinger and Todd Johnson.

14. Example of mismatch in elevation. Quad to Spool A14-1 Quad Spool A14-2 Dipole Spool to Dipole Quad to Spool to Dipole interface. Survey and realignment in this area is presently taking place. CHAURIZE, SALAH J. 03/05/2003

15. Elevation Data at A0 and A1 We really have insufficient data on elevations. We may be missing some important discrepancies.

16. Results of the Level Run

17. B-sector elevation corrections Shift is 17.5 mils

18. E-sector elevation corrections E28-2 E17-1 E34-5 Shift is –39.4 mils

19. Talyvel Clinometer 953 more to go!

20. Comparison with Survey Data outliers A19 to A 26

21. Comprehensive Comparisonwith Survey Some outliers

22. Correlation – Roll vs MFG

23. Quads with Large Rolls

24. Twist Magnets with twist Greater than 1 mrad.

25. Effect of MR Magnet Removal Roll: Twist:

26. Pockets of Interest Magnets with twist Greater than 1 mrad.

27. Distribution of larger rolls in the Tevatron. 17.4% have rolls > 1 mrad.

28. Level Meters in the Tevatron Duane Plant, Todd Johnson, Jim Volk, Andrey Chupyra.

29. Continuous relative elevation monitor.

30. A16-3 and A16-4 WLM Jim Volk

31. Some recent history from Todd Johnson’s Tilt Meters. B-Sector A-Sector E-Sector Quench

32. Have the Tev magnet coils moved in the ensuing years? We measure significant differences in roll between the us and ds ends of many magnets. The alignment lugs were originally set to account for any magnet twist: Both ends of the magnet should have the same roll. Twist may be induced by 4-point stands. There are several things we can do: a. Measure smart bolt settings (will be done tomorrow on a select set of magnets in the tunnel). b. Use the Kaiser coil to check for magnet coil alignment. c. There are about 24 magnets in storage that could be put on a stand and checked. Coupling in the Tevatron

33. Tev Magnet cross section

34. Smart Bolt Survey in Tevatron Would induce one Unit of a1. Measurements taken on 2/1982 and 2/18/2003. Dave Harding, John Carlson, Jamie Blowers, And many others.

35. Coupling Study @ 150 GeV • Beam mis-steered in P1 line • T:SQ global skew quad circuit at 0 amps • Look at betatron oscillation coupling between horz & vert • Below are ~ 4 turns of data; 1st turn on left; scale limits  4mm Horizontal Vertical Ron Moore

36. This is where we need to get creative. How do we manage the baseline configuration? • We need to measure magnet positions often, at least once per year. • To follow changes as they take place, we should monitor what magnets are doing over time. • Keep track of changes in corrector magnet currents. • The tilt monitors give a measure of short term changes: We need a cheap way to put 1,000 of these in the ring. • Hans Jostlein has come up with a quick roll measuring device: We hope to be able to do the entire ring in 2-3 days. • In a similar vein, we’ll need some way to quickly measure elevation. Horizontal position checks would be useful also.

37. Summary • A BD is being developed for Tevatron magnets to include • magnetic fields and alignment data. • We need to complete elevation measurements. • A14-1 was a revelation. • A horizontal survey network is in the design stage. • A continuous position monitoring system is being developed. • What can we say about twist. • We may want to realign shims within the iron yoke magnets.