Tunable side‐bounce monochromator

• Published in: Journal of synchrotron radiation Vol. 28; no. 1; pp. 125 - 130
• Main Authors: Hong, Hawoong, Tischler, Jonathan, Shi, Xianbo, Highland, Matthew
• Format: Journal Article
• Language: English
• Published: 5 Abbey Square, Chester, Cheshire CH1 2HU, England International Union of Crystallography 01.01.2021; John Wiley & Sons, Inc
• Subjects: Angles (geometry); Double cystal monochromator; double‐crystal monochromators; Energy tunable; Exact solutions; NUCLEAR PHYSICS AND RADIATION PHYSICS; Ray tracing; Side-bounce beamline; side‐bounce beamlines; Steering; double-crystal monochromators; energy tunable; side-bounce beamlines
• ISSN: 1600-5775; 0909-0495; 1600-5775
• DOI: 10.1107/S1600577520014940

Side‐bounce beamlines with fixed‐exit angles have been intended to operate with only one selected energy. However, a tunable monochromator in a new geometry is presented here that will make side‐bounce beamlines energy tunable. It requires the addition of two more rotations. Analytic solutions for the values of these two rotation angles are provided. The validity of the new concept was checked by ray tracing and two‐dimensional searches in the additional angles. Operational details on the new scheme, including the exit offset and steering of the beams, were determined. In addition to tunability, the new monochromator will reduce the loss from the polarization factor at low energies. A new type of double‐crystal monochromator is proposed. It will make side‐bounce beamlines energy tunable by adding two more rotations to a conventional double‐crystal monochromator.