Coherent bremsstrahlung at Beijing Electron-Positron Collider

The main characteristics of coherent bremsstrahlung (CBS) for the Beijing E lectron-Positron Collider are calculated. At this collider dN (gamma) simil ar to 3 x 10(8) dE(gamma)/E-gamma photons of CBS will be emitted for a sing le collision of the beams in the energy range E-gamma less than or similar to 240 eV. It seems that CBS can be a potential tool for optimizing collisi ons and measuring Beam parameters. Indeed, the bunch length sigma(z) can be found fi om the CBS spectrum because critical energy E-c proportional to 1 /sigma(z); the horizontal transverse bunch size sigma(x) is related to dN(g amma) proportional to 1/sigma(x)(2). In addition, CBS may be very useful fo r a fast control over an impact parameter R between the colliding bunch axe s.