The Poisson alignment reference system implementation at the Advanced Photon Source. Metadata

Metadata describes a digital item, providing (if known) such information as creator, publisher, contents, size, relationship to other resources, and more. Metadata may also contain "preservation" components that help us to maintain the integrity of digital files over time.


  • Main Title The Poisson alignment reference system implementation at the Advanced Photon Source.


  • Author: Feier, I.
    Creator Type: Personal


  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: US Department of Energy (United States)


  • Name: Argonne National Laboratory
    Place of Publication: Illinois
    Additional Info: Argonne National Lab., IL (United States)


  • Creation: 1998-09-21


  • English


  • Content Description: The Poisson spot was established using a collimated laser beam from a 3-mW diode laser. It was monitored on a quadrant detector and found to be very sensitive to vibration and air disturbances. Therefore, for future work we strongly recommend a sealed vacuum tube in which the Poisson line may be propagated. A digital single-axis feedback system was employed to generate an straight line reference (SLR) on the X axis. Pointing accuracy was better than 8 {+-} 2 microns at a distance of 5 m. The digital system was found to be quite slow with a maximum bandwidth of 47 {+-} 9 Hz. Slow drifts were easily corrected but any vibration over 5 Hz was not. We recommend an analog proportional-integral-derivative (PID) controller for high bandwidth and smooth operation of the kinematic mirror. Although the Poisson alignment system (PAS) at the Advanced Photon Source is still in its infancy, it already shows great promise as a possible alignment system for the low-energy undulator test line (LEUTL). Since components such as wigglers and quadruples will initially be aligned with respect to each other using conventional means and mounted on some kind of rigid rail, the goal would be to align six to ten such rails over a distance of about 30 m. The PAS could be used to align these rails by mounting a sphere at the joint between two rails. These spheres would need to be in a vacuum pipe to eliminate the refractive effects of air. Each sphere would not be attached to either rail but instead to a flange connecting the vacuum pipes of each rail. Thus the whole line would be made up of straight, rigid segments that could be aligned by moving the joints. Each sphere would have its own detector, allowing the operators to actively monitor the position of each joint and therefore the overall alignment of the system.
  • Physical Description: 11 p.


  • Keyword: Advanced Photon Source
  • Keyword: Wiggler Magnets
  • Keyword: Feedback
  • STI Subject Categories: 43 Particle Accelerators
  • Keyword: Lasers
  • Keyword: Digital Systems
  • Keyword: Implementation
  • Keyword: Flanges
  • Keyword: Alignment


  • Conference: 5th International Workshop on Accelerator Alignment, Argonne, IL (US), 10/13/1997--10/17/1997


  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI


  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article


  • Text


  • Report No.: ANL/ASD/CP-97313
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 10970
  • Archival Resource Key: ark:/67531/metadc622121


  • Display Note: INIS; OSTI as DE00010970
  • Display Note: Medium: P; Size: 11 pages