1. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 1 Undulator Tuning Status Z. Wolf, S. Anderson, R. Colon, S. Jansson, D. Jensen, S.Kaplunenko, Y. Levashov, Ed. Reese, A. Weidemann

2. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 2 Undulator Tuning And Related Topics Overview Undulator quadrupoles Transportation test Temperature “tests” Repairs Shim-beampipe interference fix Re-tuning status/schedule Tunnel field map Reference undulator

3. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 3 Undulator Quadrupoles Finished Scott Anderson (Detailed report in preparation) No Outliers No Tolerance (individual supplies) No Tolerance

4. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 4 Undulator Quadrupoles Finished Absolute Value Of Magnetic Center Shift In BBA Cycle Tolerance 3 microns

5. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 5 Undulator Quadrupoles Finished Difference Between Magnetic And Mechanical Centers

6. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 6 Transportation Test Details in LCLS-TN-08-9 Route Outside and undulator temperatures Undulator temperature rise 1° F (0.6 C) During test D. Kharakh, Y. Levashov, N. Horton, Y. Levashov, E. Reese

7. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 7 Transportation Test

8. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 8 Transportation Test Conclusion No significant changes occurred to the undulator during the transportation test.

9. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 9 Temperature “Tests” Details in LCLS-TN-08-8 Undulator Storage T lab = 20 ± 0.1 C Building 750, 18 undulators, T = 11 C, 3 checked Building 33, 6 undulators, T = 27 C, 2 checked Building 81 storage, 5 undulators, T = 20 ± 2 C, 1 checked Building 81 laboratory, 1 undulator, T = 20 ± 0.1 C Problem The undulator fiducialization changed. Examples to follow. Y. Levashov, E. Reese

10. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 10 Bldg 750 Temperature 20 C ~11 C Temperature ~9 C

11. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 11 Building 750 Gap Change 1 micron average gap change Gap change during storage Field changes agree with gap changes CMM Hall probe Pole sub-assembly length

12. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 12 Building 750 Undulator Changes x-trajectory, y-trajectory, phase errors, all ok But The fiducialization changed by 200 microns in x

13. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 13 Building 750, 3 Undulators

14. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 14 Building 33 Temperature J. Chan

15. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 15 Building 33 Gap Changes

16. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 16 Building 81 Storage Area Temperature

17. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 17 Building 81 Storage, Gap Changes

18. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 18 Building 81 Lab, Gap Changes T = 20 ± 0.1 C

19. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 19 Temperature Fiducialization Change Summary T = 11 C T = 20 ± 2 C T = 27 C T = 20 ± 0.1 C err = 50 μm err = 0.7 μm err = 0.2 μm err = 7 μm For ∆K/K = 1.5 × 10 -4 ∆x max = 195 μm ∆y max = 83 μm ∆g max = 0.9 μm Conclusion Temperature excursions permanently change the undulator fiducialization. Undulator 39

20. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 20 Trajectories And Phase Are OK Undulator 39 Went through all temperature excursions. Trajectories: no significant change Phase Errors: added ~1° rms

21. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 21 Storage Problem Summary The undulators in bldgs 750 and 33 must be re-fiducialized. The trajectories and phases are ok. The average gap changed by about 1 micron. The magnetic axis shifted by about 200 microns in x. 200 microns → ∆K/K ≈ 1.8 × 10 -4 Tolerance ∆K/K = 1.5 × 10 -4 Bldg 750 re-measured undulators All finished undulators are presently stored in the MMF. A recent air conditioner shutdown does not appear to have damaged them.

22. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 22 Tuning Work Repair undulators Fix shim interferences Re-tune Re-fiducialize A. Weidemann, Y. Levashov, E. Reese

23. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 23 Two areas to replace shims 130µm Ed Reese Repairs Before repair

24. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 24 50µm Ed Reese After Repair

25. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 25 X-Trajectory Shim Interference Fix X-trajectory shim Cut material off X-trajectory shims limit vacuum chamber “in”-motion to 2.5mm Undulators tuned for ±6 mm Shims to be modified to allow - 6mm motion and Undulator tuning to be checked

26. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 26 Y-Trajectory Shim Interference Fix Old New Fix, new triangles on old strongback

27. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 27 Schedule Yellow items are done. Three undulators still need repair. Eleven undulators have shims replaced, are re-tuned and re-fiducialized. Two have feet and are RFI. (The CMM has been tied up with girders.)

28. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 28 Average Field On Each Girder In The Tunnel S. Anderson, J. Welch By bench By tunnel By limit Shield Atten = 1/6 Pole Amplif = 2.4 By limit From I 2y limit for constant field: ∆B gap max = 0.09 G ∆B outside max = 0.2 G

29. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 29 Reference Undulator K is tuned to the same value each time, K nom = 3.498623 K is adjusted for temperature and X-position. (All errors included in the plot.) R.M.S. = 1.1 × 10 -4 Re-tuning starts

30. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu November 12, 2008 30 Conclusion Undulator quadrupole measurements are done. A transportation test showed no undulator changes from handling. Temperature excursions produce permanent undulator fiducialization changes. The magnetic field in the tunnel is within the range of the magnetic shield except at a few girders. Three undulators still require repairs. Re-tuning is roughly 1/3 done. Adequate undulator storage is still a problem. (The tunnel is our “planned” solution.)