1 / 24

LCLS Prototype Undulator - Mechanical Design and First Test Experience

This article discusses the major design features and first test results of the LCLS Prototype Undulator, including the use of titanium housing, aluminum alloy holders, and incremental shims for gap adjustment. It also explores possible design changes and improvements.

geraldinek
Download Presentation

LCLS Prototype Undulator - Mechanical Design and First Test Experience

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. LCLS Prototype Undulator Mechanical Design and First Test ExperienceEmil Trakhtenberg Argonne National LaboratoryApril 24, 2002 • Major Design features • First Test Results • Possible Design Changes Emil Trakhtenberg, ANL

  2. LCLS Prototype Undulator(major design features) • Titanium housing made of forged 12” bar. • Poles with so-called “wings”. • Holder of poles and magnets made of aluminum alloy to compensate the changes in the magnetization of the permanent magnets with temperature. • Only one clamp for each pole and magnet. Clamps are made of titanium. • Incremental shims or “push-pull” screw might be used for the undulator gap adjustment. Emil Trakhtenberg, ANL

  3. Gap at the ends of the magnetic structure can be precisely tuned by piezo-translators (two on each end). • Out-bond area is completely open for the side shims to tune the field strength along the undulator. • Side shims have six bars made of low-carbon steel. Each bar can be individually adjusted and locked in place. • Five cam-shaft movers are used for alignment of the undulator as a whole. Emil Trakhtenberg, ANL

  4. LCLS Prototype Undulator Cross Section • Window inside titanium housing is precisely machined. • Precisely machined grooves in the side racks locate pole and magnet positions in the ”Z” direction. Emil Trakhtenberg, ANL

  5. LCLS Prototype Undulator Magnetic Structure • Shims or “push-pull” screws might be used for the gap adjustment. • Base plate of aluminum alloy was chosen to compensate the change of the field along with temperature change. Emil Trakhtenberg, ANL

  6. LCLS Prototype Undulator Pole • Titanium “ears” are ground together finally with poles and then heat treated. • Ears are stretched out of the magnets and fit into the rack grooves. Emil Trakhtenberg, ANL

  7. LCLS Prototype Undulator Titanium Housing Emil Trakhtenberg, ANL

  8. Titanium Housing Deflection under Magnetic Forces Emil Trakhtenberg, ANL

  9. LCLS Prototype Undulator on the Test Stand • Prototype undulator is installed on two steel pillars (temporarily). • Five cam-shaft movers are used for undulator alignment. Emil Trakhtenberg, ANL

  10. LCLS Prototype Undulator Housing on the Support Stand Emil Trakhtenberg, ANL

  11. Deflection of the LCLS Prototype Undulator Emil Trakhtenberg, ANL

  12. Side Shim for the LCLS Prototype Undulator • There are three threaded low - carbon bars per shim. • Side shims can be installed where needed to compensate phase errors and to adjust the vertical field. Emil Trakhtenberg, ANL

  13. End Tuning for the LCLS Prototype Undulator • The short end section of the magnet structure on both ends has slots in the base plate and in the side racks. • It allows precise tuning of the pole gap using piezo-translators. Emil Trakhtenberg, ANL

  14. Fixture for the Magnet Structure Assembly Emil Trakhtenberg, ANL

  15. Movers for LCLS Prototype Undulator Emil Trakhtenberg, ANL

  16. Results of the First Undulator Motion Test-1 Emil Trakhtenberg, ANL

  17. Results of the First Undulator Motion Test-2 Emil Trakhtenberg, ANL

  18. Cam-Shaft Mover for LCLS Prototype Undulator Emil Trakhtenberg, ANL

  19. LCLS Prototype Undulator Possible Design Changes • 1. Clamp each pole from both sides. • 2. Increase the rigidity of the bottom plate for the magnet • structure if still necessary. • 3. Compare the price of a round housing and an assembled one. • 4. Accommodate the wire potentiometers in the mover • design and replace the spherical double bearings with • roller bearings having an outside spherical ring. • 5. Consider the use of the precisely ground steel shims • instead of the brass ones. • 6. Shield the motors. Emil Trakhtenberg, ANL

  20. Double Clamped Pole for the LCLS Prototype Undulator Emil Trakhtenberg, ANL

  21. Assembled Housing for the LCLS Undulator Emil Trakhtenberg, ANL

  22. LCLS Prototype Undulator on Magnet Measurement Stand-1 Emil Trakhtenberg, ANL

  23. LCLS Prototype Undulator on Magnet Measurement Stand-2 Emil Trakhtenberg, ANL

  24. Acknowledgments Vladimir Tcheskidov, Nikolai Vinokurov, Efim Gluskin, Mark Erdmann, Oleg Makarov, Thomas Powers, Isaac Vasserman, Patric Den Hartog, Elizabeth Moog, Branislav Brajuskovic, Jeffrey Collins. Emil Trakhtenberg, ANL

More Related