THE TROIKA BEAMLINE AT ESRF

The Troika beamline is a high-brilliance multi-station undulator beaml ine that operates with x-ray transparent diamond and/or beryllium mono chromators. A series of such transmission monochromators can use the s ame white beam and supply several experimental stations simultaneously with monochromatic x-rays of slightly different energies (beam-multip lexing). The favorable thermal and crystallographic properties of perf ect diamond are well matched to the characteristics of the new low emi ttance undulator sources. The low absorption of both diamond and beryl lium make beam-multiplexing to an attractive alternative to convention al single-station beamlines. The Troika beamline operates between 6 ke V and 18 keV taking advantage of the gap tunable undulator. First expe riments exploring the brightness, polarization properties and the high flux of coherent x-rays produced reveal the superior potential of thi rd generation synchrotron sources.