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Ensuring Precision in LCLS Undulator Replacement: Magnetic Tuning and Shim Adjustments

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The replacement of LCLS undulators requires meticulous tuning due to inherent variations in magnet properties. Each of the 40 undulators must be calibrated to ensure the proper beam trajectory coordinates (X and Y) align for the same K-value, despite inherent differences. Accurate shim adjustments are crucial, with variations in coordinates managed within specific micron tolerances. This process involves grinding shim dimensions to maintain consistency across undulators and verifying the replacement precision through optical and non-contact measurements.

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Ensuring Precision in LCLS Undulator Replacement: Magnetic Tuning and Shim Adjustments

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  1. BASICS • It is absolutely impossible to make all 40 LCLS undulators identical due to variation in the magnet properties and a tolerance stack-up, determining the actual pole gap. • Our goal is to find during the magnetic tuning for each individual undulator the proper beam trajectory coordinates (X and Y) for the same K-value. • Each undulator should be tuned in such a way that beam trajectory should be on the intersection of the horizontal and vertical planes. • X and Y coordinates have to be connected to the fiducials for each individual undulator through the magnetic needles. LCLS Undulator Replacement

  2. How to replace any of the LCLS undulators: • We are expecting that the variations in x coordinates between the different LCLS undulators will be within 800 – 1000 microns and the variation in Y coordinate will be within 30 – 50 microns. • Undulator supporting plates (on each side) have vertical and horizontal shims with the sufficient thickness to accommodate X and Y coordinate variations by grinding. • These shims should be precisely ground to get dimensions “A” and “B” exactly the same for all undulators with the precision 20 – 30 microns for the dimension “B” and 50 – 70 microns for the dimension “A”. • A true kinematic mount is not appropriate in my opinion . It will decrease rigidity of the whole structure without any benefit. LCLS Undulator Replacement

  3. LCLS Undulator Replacement

  4. HOW TO MAKE ALL LCLS UNDULATORS IDENTICAL LCLS Undulator Replacement

  5. SUPPORT ADJUSTING SHIMS – EXPLODED VIEW LCLS Undulator Replacement

  6. SUPPORT ADJUSTING SHIMS LCLS Undulator Replacement

  7. CONCLUSION • Test of the LCLS undulator replacement will be a part of SUT. • We intend to remove the dummy undulator off the girder and bring it back 5-6 times and verify optically and with the use of KEYENCE non-contact laser measurement the precision and repeatability of replacement. LCLS Undulator Replacement

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