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Undulator Tuning Status

Undulator Tuning Status. Z. Wolf, S. Anderson, R. Colon, S. Jansson, D. Jensen, S.Kaplunenko, Y. Levashov, Ed. Reese, A. Weidemann. Undulator Tuning And Related Topics. Overview Undulator quadrupoles Transportation test Temperature “tests” Repairs Shim-beampipe interference fix

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Undulator Tuning Status

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  1. Undulator Tuning Status Z. Wolf, S. Anderson, R. Colon, S. Jansson, D. Jensen, S.Kaplunenko, Y. Levashov, Ed. Reese, A. Weidemann

  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. Undulator Quadrupoles Finished Scott Anderson (Detailed report in preparation) No Tolerance (individual supplies) No Tolerance No Outliers

  4. Undulator Quadrupoles Finished Tolerance 3 microns Absolute Value Of Magnetic Center Shift In BBA Cycle

  5. Undulator Quadrupoles Finished Difference Between Magnetic And Mechanical Centers

  6. Transportation Test D. Kharakh, Y. Levashov, N. Horton, Y. Levashov, E. Reese Details in LCLS-TN-08-9 During test Outside and undulator temperatures Undulator temperature rise 1° F (0.6 C) Route

  7. Transportation Test

  8. Transportation Test Conclusion No significant changes occurred to the undulator during the transportation test.

  9. Temperature “Tests” Y. Levashov, E. Reese Details in LCLS-TN-08-8 Undulator Storage Tlab = 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.

  10. Bldg 750 Temperature 20 C ~9 C Temperature ~11 C

  11. Building 750 Gap Change Pole sub-assembly length Field changes agree with gap changes Gap change during storage 1 micron average gap change CMM Hall probe

  12. Building 750 Undulator Changes x-trajectory, y-trajectory, phase errors, all ok But The fiducialization changed by 200 microns in x

  13. Building 750, 3 Undulators

  14. Building 33 Temperature J. Chan

  15. Building 33 Gap Changes

  16. Building 81 Storage Area Temperature

  17. Building 81 Storage, Gap Changes

  18. Building 81 Lab, Gap Changes T = 20 ± 0.1 C

  19. Temperature Fiducialization Change Summary T = 20 ± 2 C T = 20 ± 0.1 C Undulator 39 T = 11 C T = 27 C err = 50 μm err = 7 μm err = 0.7 μm err = 0.2 μm For ∆K/K = 1.5 × 10-4 ∆xmax = 195 μm ∆ymax = 83 μm ∆gmax = 0.9 μm Conclusion Temperature excursions permanently change the undulator fiducialization.

  20. Trajectories And Phase Are OK Undulator 39 Went through all temperature excursions. Trajectories: no significant change Phase Errors: added ~1° rms

  21. Storage Problem Summary Bldg 750 re-measured undulators 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 All finished undulators are presently stored in the MMF. A recent air conditioner shutdown does not appear to have damaged them.

  22. Tuning Work A. Weidemann, Y. Levashov, E. Reese • Repair undulators • Fix shim interferences • Re-tune • Re-fiducialize

  23. RepairsBefore repair 130µm Two areas to replace shims Ed Reese

  24. After Repair 50µm Ed Reese

  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. Y-Trajectory Shim Interference Fix New Old Fix, new triangles on old strongback

  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. Average Field On Each Girder In The Tunnel S. Anderson, J. Welch By limit From I2y limit for constant field: ∆Bgapmax = 0.09 G By bench By tunnel Shield Atten = 1/6 Pole Amplif = 2.4 By limit ∆Boutsidemax = 0.2 G

  29. Reference Undulator Re-tuning starts K is tuned to the same value each time, Knom = 3.498623 K is adjusted for temperature and X-position. (All errors included in the plot.) R.M.S. = 1.1 × 10-4

  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.)

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