Positioning system for the LCLS undulator.

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Description

The Linac Coherent Light Source (LCLS) Project includes the undulator subsystem that has 33 undulator magnetic structures each 3.4 m long. Positioning of the LCLS undulators along the undulator line with an accuracy of 50 {micro}m in the vertical transverse direction is required. A prototype of the LCLS undulator has been built with a positioning system based on three stages with cam shafts. Each cam shaft produces reciprocating motion with a range of {+-}3 mm. A servomotor with integrated brake, incremental rotary encoder, servo amplifier, and controller is used with a 100:1 ratio gear box to drive each cam shaft. ... continued below

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2 pages

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Trakhenberg, E. M. September 12, 2002.

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Description

The Linac Coherent Light Source (LCLS) Project includes the undulator subsystem that has 33 undulator magnetic structures each 3.4 m long. Positioning of the LCLS undulators along the undulator line with an accuracy of 50 {micro}m in the vertical transverse direction is required. A prototype of the LCLS undulator has been built with a positioning system based on three stages with cam shafts. Each cam shaft produces reciprocating motion with a range of {+-}3 mm. A servomotor with integrated brake, incremental rotary encoder, servo amplifier, and controller is used with a 100:1 ratio gear box to drive each cam shaft. Resolution of the motion control is about 0.05 {micro}m. SmartMotors are connected in parallel through an RS-485 interface to the serial port of the computer. With this approach, the control system is easily expandable; up to 120 motors can be controlled with one serial port. Positioning accuracy of about 10 {micro}m for the LCLS undulator prototype is demonstrated.

Physical Description

2 pages

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  • 24th International Free Electron Laser Conference and 9th FEL User Workshop (FEL 2002), Argonne, IL (US), 09/09/2002--09/13/2002

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  • Report No.: ANL/XFD/CP-108643
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 801622
  • Archival Resource Key: ark:/67531/metadc737110

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  • September 12, 2002

Added to The UNT Digital Library

  • Oct. 19, 2015, 7:39 p.m.

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  • March 25, 2016, 2:16 p.m.

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Trakhenberg, E. M. Positioning system for the LCLS undulator., article, September 12, 2002; Illinois. (digital.library.unt.edu/ark:/67531/metadc737110/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.