Position Stability Monitoring of THEthe LCLS Undulator Quadrupoles
Abstract
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.
- Authors:
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1037607
- Report Number(s):
- SLAC-PUB-14891
TRN: US1201623
- DOE Contract Number:
- AC02-76SF00515
- Resource Type:
- Conference
- Resource Relation:
- Conference: Presented at 33rd International Free Electron Laser Conference (FEL 2011), Shanghai, China, 22-26 Aug 2011
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS; FREE ELECTRON LASERS; GROUND MOTION; LIGHT SOURCES; LINEAR ACCELERATORS; MONITORING; MONITORS; PLANNING; QUADRUPOLES; RESOLUTION; STABILITY; WAVELENGTHS; WIGGLER MAGNETS; Accelerators,XFEL
Citation Formats
Nuhn, Heinz Dieter, Gassner, Georg, Peters, Franz, and /SLAC. Position Stability Monitoring of THEthe LCLS Undulator Quadrupoles. United States: N. p., 2012.
Web.
Nuhn, Heinz Dieter, Gassner, Georg, Peters, Franz, & /SLAC. Position Stability Monitoring of THEthe LCLS Undulator Quadrupoles. United States.
Nuhn, Heinz Dieter, Gassner, Georg, Peters, Franz, and /SLAC. 2012.
"Position Stability Monitoring of THEthe LCLS Undulator Quadrupoles". United States. https://www.osti.gov/servlets/purl/1037607.
@article{osti_1037607,
title = {Position Stability Monitoring of THEthe LCLS Undulator Quadrupoles},
author = {Nuhn, Heinz Dieter and Gassner, Georg and Peters, Franz and /SLAC},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/1037607},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Mar 26 00:00:00 EDT 2012},
month = {Mon Mar 26 00:00:00 EDT 2012}
}