High-resolution accelerator alignment using x-ray optics

We propose a novel alignment technique utilizing the x-ray beam of an undulator in conjunction with pinholes and position-sensitive detectors for positioning components of the accelerator, undulator, and beam line in an x-ray free-electron laser. Two retractable pinholes at each end of the undulator...

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Bibliographic Details
Published in:Physical review special topics. PRST-AB. Accelerators and beams 2006-03, Vol.9 (3), p.030701, Article 030701
Main Authors: Yang, Bingxin, Friedsam, Horst
Format: Article
Language:English
Subjects:
Accelerators
Accuracy
Alignment
Detectors
Electron beams
Free electron lasers
Geometrical optics
Pinhole cameras
Position sensing
Real time operation
Reproducibility
X ray optics
Zone plates
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Summary:We propose a novel alignment technique utilizing the x-ray beam of an undulator in conjunction with pinholes and position-sensitive detectors for positioning components of the accelerator, undulator, and beam line in an x-ray free-electron laser. Two retractable pinholes at each end of the undulator define a stable and reproducible x-ray beam axis (XBA). Targets are precisely positioned on the XBA using a pinhole camera technique. Position-sensitive detectors responding to both x-ray and electron beams enable direct transfer of the position setting from the XBA to the electron beam. This system has the potential to deliver superior alignment accuracy (1–3μm ) for target pinholes in the transverse directions over a long distance (200 m or longer). It can be used to define the beam axis of the electron-beam–based alignment, enabling high reproducibility of the latter. This x-ray–based concept should complement the electron-beam–based alignment and the existing survey methods to raise the alignment accuracy of long accelerators to an unprecedented level. Further improvement of the transverse accuracy using x-ray zone plates will be discussed. We also propose a concurrent measurement scheme during accelerator operation to allow real-time feedback for transverse position correction.
ISSN:1098-4402
1098-4402
2469-9888
DOI:10.1103/PhysRevSTAB.9.030701