Open AccessPerformance limits of indirectly cryogenically cooled silicon monochromators – experimental results at the APS
Author(s) -
Lee WahKeat,
Fezzaa Kamel,
Fernandez Patricia,
Tajiri Gordon,
Mills Dennis
Publication year - 2001
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049500013868
Subject(s) - silicon , materials science , physics , optoelectronics , nuclear engineering , optics , engineering
The results of high‐heat‐load tests of indirectly cryogenically cooled silicon monochromators are presented. The measurements show that, provided that the total power absorbed by the crystal is less than ∼150 W, indirect cryogenically cooled silicon monochromators will perform well, with thermal‐induced slope errors of less than 2 arcsec. At the Advanced Photon Source, this corresponds to the undulator closed‐gap (11 mm) condition at 100 mA with white‐beam slit sizes slightly larger than the full width at half‐maximum of the radiation central cones. The dependence of the slope errors on the thermomechanical properties of silicon are discussed and clearly demonstrated.