Source size conserving broad band monochromators of fixed exit geometry for high energy synchrotron radiation

The degradation of the effective source size by energy tunable, fixed exit, broad band monochromators for high energy synchrotron radiation (40-100 ke V) is measured to be below 2 mu rad. Two monochromator schemes consisting o f either two bent Lane crystals or two SiGe gradient crystals in a non-disp ersive setting are characterized. The relative energy bandwidth is about 0. 1% and reflectivities are above 80%. The source size broadening and band wi dths are found to be in agreement with predictions by a kinematical model. (C) 2001 Published by Elsevier Science B.V.