Ms. Ding et al., COHERENT TRANSITION RADIATION DIAGNOSTIC FOR ELECTRON BUNCH SHAPE MEASUREMENT AT FELIX, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 393(1-3), 1997, pp. 504-509
An optical autocorrelation system using coherent transition radiation
has been set up to determine the electron bunch shape at FELIX. A pola
risation interferometer and a 10 x 10 mm(2) pyroelectric detector are
used to allow operation over a wide range of wavelength (from 30 mu m
to 10 mm) without strong variation in efficiency. An evacuated 15 m lo
ng overmoded waveguide is used to transport the transition radiation t
o the experimental area. The intensity of the transition radiation was
measured and compared with our calculation. The phase-retrieval techn
ique applied to the measured spectrum provides details of the electron
bunch. The bunch shapes have been studied at different buncher phase
settings. Measurements of coherent transition radiation and coherent u
ndulator radiation are compared.