Position Stability Monitoring of THEthe LCLS Undulator Quadrupoles

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X-ray FELs demand that the positions of undulator components be stable to less than 1 {mu}m per day. Simultaneously, the undulator length increases significantly in order to saturate at x-ray wavelengths. To minimize the impact of the outside environment, the Linac Coherent Light Source (LCLS) undulator is placed underground, but reliable data about ground motion inside such a tunnel was not available in the required stability range during the planning phase. Therefore, a new position monitor system had been developed and installed with the LCLS undulator. This system is capable of measuring x, y, roll, pitch and yaw of each ... continued below

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4 pages

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Nuhn, Heinz Dieter; Gassner, Georg; Peters, Franz & /SLAC March 26, 2012.

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X-ray FELs demand that the positions of undulator components be stable to less than 1 {mu}m per day. Simultaneously, the undulator length increases significantly in order to saturate at x-ray wavelengths. To minimize the impact of the outside environment, the Linac Coherent Light Source (LCLS) undulator is placed underground, but reliable data about ground motion inside such a tunnel was not available in the required stability range during the planning phase. Therefore, a new position monitor system had been developed and installed with the LCLS undulator. This system is capable of measuring x, y, roll, pitch and yaw of each of the 33 undulator quadrupoles with respect to stretched wires. Instrument resolution is about 10 nm and instrument drift is negligible. Position data of individual quadrupoles can be correlated along the entire 132-m long undulator. The system has been under continuous operation since 2009. This report describes long term experiences with the running system and the observed positional stability of the undulator quadrupoles.

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4 pages

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  • Presented at 33rd International Free Electron Laser Conference (FEL 2011), Shanghai, China, 22-26 Aug 2011

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  • Report No.: SLAC-PUB-14891
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 1037607
  • Archival Resource Key: ark:/67531/metadc841957

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • March 26, 2012

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • Dec. 6, 2016, 4:13 p.m.

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Nuhn, Heinz Dieter; Gassner, Georg; Peters, Franz & /SLAC. Position Stability Monitoring of THEthe LCLS Undulator Quadrupoles, article, March 26, 2012; United States. (digital.library.unt.edu/ark:/67531/metadc841957/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.