OPTICAL CAVITIES FOR IR-FELS AT THE FELI

Authors
SAEKI K OKUMA S OSHITA E WAKITA K KOBAYASHI A TOMIMASU T
Citation
K. Saeki et al., OPTICAL CAVITIES FOR IR-FELS AT THE FELI, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 375(1-3), 1996, pp. 10-12
Citations number
6
Categorie Soggetti
Nuclear Sciences & Tecnology","Physics, Particles & Fields","Instument & Instrumentation",Spectroscopy
Journal title
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment → ACNP
ISSN journal
01689002
Volume
375
Issue
1-3
Year of publication
1996
Pages
10 - 12
Database
ISI
SICI code
0168-9002(1996)375:1-3<10:OCFIAT>2.0.ZU;2-6
Abstract
The g-parameters of two optical cavities whose length is 6.718 m are d esigned to be stable. The FEL beam is outcoupled from the upstream mir ror with an aperture by hole output coupling. The cavity mirrors are s pherical and gold-coated on copper substrate. The outcoupling mirror h as a hole of 0.5 mm diameter in the center. Our alignment system conce pt is that the optical axis of two mirrors is adjusted to coincide wit h the electron beam position. The electron beam position in the beamdu ct of the undulator is detected using three OTR plates and images of O TR at the plates are observed by CCD cameras.