Title :
Alignment of the VISA undulator
Author :
Ruland, R. ; Arnett, D. ; Bowden, G. ; Carr, R. ; Dix, B. ; Fuss, B. ; Le Cocq, C. ; Wolf, Z. ; Aspenleiter, J. ; Rakowsky, G. ; Skaritka, J. ; Duffy, P. ; Libkind, M.
Author_Institution :
Linear Accel. Center, Stanford Univ., CA, USA
Abstract :
The Visible-Infrared SASE Amplifier (VISA) undulator consists of four 99 cm long segments. Each undulator segment is set up on a pulsed-wire bench, to characterize the magnetic properties and to locate the magnetic axis of the FODO array. Subsequently, the location of the magnetic axis, as defined by the wire, is referenced to tooling balls on each magnet segment by means of a straightness interferometer. After installation in the vacuum chamber, the four magnet segments are aligned with respect to themselves and globally to the beam line reference laser. A specially designed alignment fixture is used to mount one straightness interferometer each in the horizontal and vertical plane of the beam. The goal of these procedures is to keep the combined rms trajectory error, due to magnetic and alignment errors, to 50 μm
Keywords :
superradiance; wigglers; FODO array; VISA undulator alignment; Visible-Infrared SASE Amplifier undulator; alignment errors; beam line reference laser; combined rms trajectory error; magnetic axis; magnetic errors; magnetic properties; pulsed-wire bench; specially designed alignment fixture; straightness interferometer; tooling balls; Coordinate measuring machines; Laser beams; Mechanical variables measurement; Optical amplifiers; Optical interferometry; Particle measurements; Position measurement; Pulse amplifiers; Undulators; Wire;
Conference_Titel :
Particle Accelerator Conference, 1999. Proceedings of the 1999
Conference_Location :
New York, NY
Print_ISBN :
0-7803-5573-3
DOI :
10.1109/PAC.1999.795558
