VISA Undulator Fiducialization and Alignmen
نویسندگان
چکیده
As part of the R&D program towards a fourth generation light source, a Spontaneous Emission (SASE) demonstration is being prepared. The Visible Amplifier (VISA) undulator will be installed at Brookhaven National Laboratory year. The VISA undulator is an in-vacuum, 4-meter long, 1.8 cm period, pure-pe device, with a novel, strong focusing, permanent magnet FODO array included w mm undulator gap. The undulator is constructed of 99 cm long segments. To SASE gain requires establishing overlap of electron and photon beams to within imposes challenging tolerances on mechanical fabrication and magnetic fie necessitates use of laser straightness interferometry for calibration and alignment axes of the undulator segments. This paper describes the magnetic centerline de the fiducialization and alignment processes which were performed to meet the tole
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