Alignment of the VISA Undulator
Abstract
As part of the R and D program towards a fourth generation light source, a Self-Amplified Spontaneous Emission (SASE) demonstration is being prepared. The Visible-Infrared SASE Amplifier (VISA) undulator is being installed at Brookhaven National Laboratory. The VISA undulator is an in-vacuum, 4-meter long, 1.8 cm period, pure-permanent magnet device, with a novel, strong focusing, permanent magnet FODO array included within the fixed, 6 mm undulator gap. The undulator is constructed of 99 cm long segments. To attain maximum SASE gain requires establishing overlap of electron and photon beams to within 50 pm rms. This imposes challenging tolerances on mechanical fabrication and magnetic field quality, and necessitates use of laser straightness interferometry for calibration and alignment of the magnetic axes of the undulator segments. This paper describes the magnetic centerline determination, and the fiducialization and alignment processes, which were performed to meet the tolerance goal.
- Authors:
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Energy Research (ER) (US)
- OSTI Identifier:
- 764963
- Report Number(s):
- SLAC-PUB-8336
TRN: US0004948
- DOE Contract Number:
- AC03-76SF00515
- Resource Type:
- Technical Report
- Resource Relation:
- Other Information: PBD: 9 Feb 2000
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS; ALIGNMENT; CALIBRATION; LIGHT SOURCES; PERMANENT MAGNETS; PHOTON BEAMS; WIGGLER MAGNETS
Citation Formats
Ruland, Robert E. Alignment of the VISA Undulator. United States: N. p., 2000.
Web. doi:10.2172/764963.
Ruland, Robert E. Alignment of the VISA Undulator. United States. https://doi.org/10.2172/764963
Ruland, Robert E. 2000.
"Alignment of the VISA Undulator". United States. https://doi.org/10.2172/764963. https://www.osti.gov/servlets/purl/764963.
@article{osti_764963,
title = {Alignment of the VISA Undulator},
author = {Ruland, Robert E},
abstractNote = {As part of the R and D program towards a fourth generation light source, a Self-Amplified Spontaneous Emission (SASE) demonstration is being prepared. The Visible-Infrared SASE Amplifier (VISA) undulator is being installed at Brookhaven National Laboratory. The VISA undulator is an in-vacuum, 4-meter long, 1.8 cm period, pure-permanent magnet device, with a novel, strong focusing, permanent magnet FODO array included within the fixed, 6 mm undulator gap. The undulator is constructed of 99 cm long segments. To attain maximum SASE gain requires establishing overlap of electron and photon beams to within 50 pm rms. This imposes challenging tolerances on mechanical fabrication and magnetic field quality, and necessitates use of laser straightness interferometry for calibration and alignment of the magnetic axes of the undulator segments. This paper describes the magnetic centerline determination, and the fiducialization and alignment processes, which were performed to meet the tolerance goal.},
doi = {10.2172/764963},
url = {https://www.osti.gov/biblio/764963},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Feb 09 00:00:00 EST 2000},
month = {Wed Feb 09 00:00:00 EST 2000}
}