DOUBLE-CRYSTAL DIFFRACTIVE MODULATOR OF SYNCHROTRON-RADIATION

The efficiency of time-modulation of synchrotron radiation by a double -crystal monochromator periodically curved by pulsed surface acoustic waves has been studied both experimentally and theoretically. It has b een shown that the efficiency of such a system is significantly higher as compared to x-ray modulation by surface acoustic waves applied to x-ray mirrors-that is under the conditions of total external reflectio n. Possible modifications and improvement of a synchrotron radiation d ouble-crystal diffractive modulator are discussed. The experiments wer e done at the diffraction beamline at the Brazilian National Synchrotr on Light Laboratory (LNLS). (C) 1998 American Institute of Physics. [S 0034-6748(98)00606-6].