1. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 Undulator Tuning Status Z. Wolf, S. Anderson, R. Colon, S. Jansson, S.Kaplunenko, Y. Levashov, Ed. Reese, R. Ruland, A. Weidemann

2. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 Outline Undulator quadrupole measurements and fiducialization Undulator tuning and fiducialization Problems Repairs Extend K Adjustment Range Schedule Reference undulator measurements

3. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 Undulator Quadrupoles Strength And Harmonics Rotating Coil System Fiducialization Vibrating Wire System

4. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 Integrated Gradient (normalized)

5. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 Harmonics n = 3, 4, 6, & 10

6. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 BBA center shift for +/- 1 amp around +/- 4.3 Amps

7. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 Quadrupole Measurements 25 Undulator Quads measured with the rotating coil. Final Magnet June 26 th. 17 Undulator quads fiducialized to their magnetic center. Final magnet June 30th. Tolerances Integrated gradient: no tolerance, measure transfer function, individual supplies Harmonics: no tolerance, small beam size, looking for big problems BBA center shift: ±3 microns, need to look at outliers, also change energy for BBA So far, all quadrupoles seem acceptable. Closer look at BBA outliers required.

8. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 Undulator Tuning And Fiducialization Overview The tuning is going well Almost done with 33 (details to follow) Mounting feet standardization is progressing Problem with storage, need to re-fiducialize 15 undulators Repairs of un-tunable undulators have started Recent plan to increase K adjustment range The measurements look good Stable, low noise, … Hall probe, short coil, long coil measurements agree The reference undulator measurements are stable

9. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 Done (6) (in Bldg. 33) Ready for feet (5) (in MMF) To be re-fiducialized (15) (in Bldg. 750) To be tuned (2) To be repaired (8) At Argonne (2) Undulator Measurement Status (5/14/08) Undulator Measurement Status Update (6/17/08) 32 through rough tuning 31 through fine tuning 2 are repaired 2 are RFI (new shims)

10. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 Re-measure After Storage x-trajectory, y-trajectory, phase errors, all ok But The fiducialization changed by 200 microns in x

11. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 Bldg 750 Temperature 20 C ~11 C Temperature ~9 C

12. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 Storage Temperature Gap Change 1 micron average gap change Gap change during storage Field changes agree with gap changes CMM Hall probe

13. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 Storage Problem Summary The undulators in bldg 750 should 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 Bldg 33 “data point” in process.

14. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 Two areas to replace shims 130µm Ed Reese Repairs Required Before repair

15. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 50µm Ed Reese After Repair

16. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 New: Extend K Adjustment Range Originally, only ±2.5 mm good field region could be achieved Originally, ±2.5 mm horizontal adjustment range required, but a larger range was desired New B x shims allow ±6 mm horizontal good field region Now we want to extend undulator horizontal adjustment range Need to solve beam pipe clearance problems

17. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 Interference with vacuum chamber 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

18. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 X trajectories

19. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 Interference with vacuum chamber. Continued Old New Fix, new triangles on old strongback

20. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 Y trajectories

21. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 X field integrals

22. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 New RFI Schedule General Plan (my view) 1) While we are waiting to install the undulators, we can re-fiducialize and fix the clearance problems according to this schedule. We start near the end and work backwards. 2) If commissioning is going well, we can install any remaining undulators “as-is”. a) The motion range will be restricted, but at the beginning where it is not as important. b) K may be slightly out of tolerance for the first few undulators. We can correct assuming bldg 750 undulators behave similarly. c) We can swap them and fix them after the machine is running. 3) This is in line with the Lehman committee’s desire to get the machine running without additional delays. * * Undulator commissioning starts # # Beam line commissioning starts

23. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 Reference undulator K is tuned to the same value each time. K is adjusted for temperature and X-position. (All errors included in the plot.) R.M.S. = 9  10 -5 Probe re-calibrated K target =3.498632 Problem with probe calibration* * Z. Wolf “Undulator tuning and fiducialization schedule”. FAC Meeting, April 2007

24. Zachary Wolf Undulator Tuning Statuswolf@slac.stanford.edu June 17, 2008 Conclusion Undulator quadrupole measurements are nearing completion. Production measurements of 33 undulators is nearly complete. New work has started. MMF throughput averaged 2 devices/month. Repairs of un-tunable undulators has started. Tuning accuracy is within the tolerances. The K adjustment range will be increased. Due to interference with the vacuum chamber in off-axis position, X and Y trajectory shims will be modified/replaced on all undulators. The undulators will be re-measured and re-fiducialized and have their shims replaced. Undulator Status 32 undulators went through rough tuning 31 undulators went through fine tuning 2 undulators are repaired 2 undulators RFI (with shims replaced) 1 undulator back from bldg 33, new temperature excursion test