P. Haar et al., EXPERIMENTAL TEST OF THE SCA FEL EXTERNAL-CAVITY, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 331(1-3), 1993, pp. 621-626
An external cavity driven by the optical pulse train of the SCA/FEL ha
s been installed and tested. The external cavity provides an opportuni
ty to enhance the micropulse energy available for experiment and can b
e used as an FEL diagnostic. We have demonstrated optical energy stora
ge which is the theoretical maximum for a cavity Q of 15. The temporal
behavior of the optical pulse in the external cavity has been compare
d to calculations of the dynamics, allowing us to infer the stability
of our system. We have used our results to plan improvements to the ex
ternal cavity.