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Title: 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.:
Stanford Linear Accelerator Center, Menlo Park, CA (US)
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. doi:10.2172/764963.
Ruland, Robert E. Wed . "Alignment of the VISA Undulator". United States. doi: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},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {2}
}

Technical Report:

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