ADAPTIVE SILICON MONOCHROMATORS FOR HIGH-POWER INSERTION DEVICES - TESTS AT CHESS, ESRF AND HASYLAB

X-ray wigglers which produce tens of kilowatts of photon power within the white beam will soon become available at third-generation sources of synchrotron radiation. Insertion devices that produce several kilow atts already exist and we have used those at CHESS, ESRF and HASYLAB t o test adaptive 111 silicon water-jet-cooled monochromators at up to 2 kW total incident beam power. This development from earlier work at t he Brookhaven National Synchrotron Light Source (NSLS) uses the pressu re in the water coolant to provide active compensation of the strain f ield in the thermal footprint, nulling its effect to within residual v ariations in Bragg angle of only a few are seconds. The design is robu st, vacuum compatible and uses no moving mechanical parts.