Abstract
A new design of a focusing monochromator is presented which overcomes both the drastic change in energy resolution when a cylindrically bent crystal is tuned to different energies and the thermal problems that arise with intense wiggler sources. A bi-triangular crystal is asymmetrically cut for the lowest desired energy and pressed to a curved cooling plate which corresponds to the focusing radius at the lowest energy. When tuning to a higher energy the most effective asymmetric cut is re-established by a rotation around the scattering vector. This rotation also changes the effective radius of bend and the position of the focal spot. The focal spots lie on approximately a straight line at a convenient angle to the secondary monochromatic beam.
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