The installation
of a chicane bunch compressor at the Accelerator Test Facility (ATF)
in Brookhaven National Lab has been completed. As part of the comissioning
phase, bunch length measurements are being undertaken. A commercially
available bunch length interferometric system(BLIS) will measure coherent
transition radiation (CTR) from an insertable foil. In addition, emitted
THz coherent edge radiation (CER) is studied. The radiation is emitted
from a diagnostic port located between the third and fourth magnets
of the chicane compressor, and transported to a cryogenic bolometer.
A six position filter wheel is used to further study aspects of the
radiation wavelength spectra. CER measurements at the ATF also include
polarization studies, verifying its fundamental differences with synchrotron
radiation. Emission of CER is correlated with compression of the beam,
and with severe distortions of the beam energy spectrum. We report experimental
progress, as well as modelling efforts using fieldEye, a far-field calculator
which is an extension of the TREDI code.