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LCLS Undulator Tuning

LCLS Undulator Tuning. Zack Wolf, Yurii Levashov, Achim Weidemann, Seva Kaplounenko, Scott Jansson, Ralph Colon, Dave Jensen. MMF Hardware Installation. FAC April 20, 2006. FAC October 12, 2006. Undulator Work Flow. Tuning Time: about 4 weeks. 1 Week, Fine Tuning. 1 Week, Rough Tuning.

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LCLS Undulator Tuning

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  1. LCLS Undulator Tuning Zack Wolf, Yurii Levashov, Achim Weidemann, Seva Kaplounenko, Scott Jansson, Ralph Colon, Dave Jensen

  2. MMF Hardware Installation FAC April 20, 2006 FAC October 12, 2006

  3. Undulator Work Flow Tuning Time: about 4 weeks 1 Week, Fine Tuning 1 Week, Rough Tuning 1 Week, Come to 20 C <1 Week, Finish Fiducialization Peak Throughput: 1 undulator per week

  4. MMF Temperature Maintenance work was done on the MMF power system causing the large changes In general, the system meets stability requirements Achim Weidemann Previous two week time history at the Kugler bench

  5. Rough Tuning Bench Components

  6. Rough Tuning Bench Reference Pole Undulator Cam Movers Zero Gauss Chamber Bench Cable Handling

  7. Capacitive Sensor Alignment Performance Undulator mechanically aligned to bench in 15 minutes Yurii Levashov

  8. Scans Begin And End In A Zero Gauss Chamber Beginning zero field measurement Ending zero field measurement Senis Hall probe Zero Offset Correction Assume linear offset dependence on time

  9. Y Trajectory Shims Bx Shim New Design Smaller external fields Uniform Bx field in gap Old Shim Design Inconel Steel Spot weld Yurii Levashov

  10. Rough Tuning Test Plan Achim Weidemann 1) Place undulator Use kinematic mount 2) Mechanically align to test stand Optical alignment check, use capacitive sensors and cam movers 3) Magnetically align Hall probe to undulator Move Hall probe in x and y to magnetic center 4) Rough tuning Tune x and y trajectories, anticipate magnetic shield 5) Adjust gap Measure K, adjust gap to set K to required value for that undulator 6) Check alignment Alignment may have changed from gap adjustment 7) Rough tuning Anticipate magnetic shield 8) Add magnetic shield 9) Check tuning

  11. Each Undulator Has Its Own K Value From Heinz-Dieter Nuhn

  12. Fine Tuning Bench Components

  13. Fine Tuning Bench Undulator With Magnetic Shield Cable Handling Cam Movers Kugler Bench Steel Girder And Stands

  14. Kugler Bench Performance Measurements by Georg Gassner X Y straightness spec: < 14 μm Pitch and yaw spec: < 4.2 μrad Specs met in long block region

  15. Coils For Fine Tuning Bench Bx, By One Undulator Period Long Coils Short Coil Zero Gauss Chamber I1 I2 Field Integral Coil Dave Jensen

  16. Fine Tuning Test Plan Yurii Levashov 1) Place undulator Use kinematic mount, use steel girder and stands, shield on 2) Mechanically align to test stand Optical alignment check, use capacitive sensors and cam movers 3) Magnetically align Hall probe to undulator Move Hall probe in x and y to magnetic center 4) Determine the tuning axis Move in x to where K has the required value 5) Tuning Tune x and y trajectories, phase 6) Add phase matching shims 7) Adjust field integrals Use long coil, I1 and I2 for both Bx and By 8) Adjust field uniformity Add quadrupole and sextupole shims as necessary 9) Final checks before gluing shims Check x and y trajectory, phase, phase matching, field integrals, uniformity

  17. Fine Tuning Test Plan (cont.) 10) Glue shims in place Remove y trajectory, quadrupole, sextupole, and phase shims, apply glue, replace 11) Check the gap Make sure no parts of a shim protrude into the gap 12) Check for errors while gluing shims Check x and y trajectories, phase, I1 and I2 of Bx and By, uniformity 13) Map Bx and By in the retracted position 14) Final results data set Measure Bx and By at x = -6, -5, …, 6 mm, y = -0.2, -0.08, 0 0.08, 0.2 mm, calculate field integrals vs z, 65 scans 15) Find the x position, y=0, where K has the required value 16) Add fiducialization magnets to both ends Measure offsets from beam axis to the center of the fiducialization magnets 17) Rough fiducialization using alignment equipment 18) Measure roll on flats at each undulator end 19) Move undulator to CMM, finish fiducialization

  18. Fiducialization

  19. Hall Probe Calibration Water NMR HP3458 Chiller For probe temperature Metrolab NMR Magnet Seva Kaplounenko

  20. Schedule Robert Ruland

  21. Conclusion • MMF construction is complete, temperature stability and set point accuracy • requirements have been met • The rough tuning bench is complete • The Hall probe calibration system is complete • The fine tuning bench has all components complete. Some fixturing work • remains. • The software is mostly complete. Some automation work remains. • Mechanical alignment takes about 15 minutes. • New Bx shims have been designed. • The fine tuning bench construction meets all specifications. • The expected throughput is one undulator per week. Each undulator, • however, spends about 4 weeks in the MMF. • One reference undulator gets re-measured every fourth undulator.

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