Abstract
The stability in synchrotron radiation of β-alumina and beryl has been investigated by exposing the crystals in a white beam at CHESS operating at 5.2 GeV electron energy over a period of ∼ 100 h at an average radiant power of 28 W/cm 2. Rocking curves at the CuK α energy were used to monitor the diffraction properties before and after exposure to synchrotron radiation. A Si(220) crystal was used as the first crystal. It was found that both materials exhibit no catastrophic material failure. β-alumina is clearly proven stable with no degradation of its rocking characteristics. There was in fact indication of reflectivity improvement after exposure. Results on beryl are not conclusive because the starting material (a mineral specimen) had a lot of inherent microstructural and crystallographic defects. Rocking curves in the soft X-ray region at 10.5 Å were also determined using a (10 1 0) RAP crystal as first crystal. A 19-layer 50 Å d-spacing Nb-C sputtered film was also characterized for comparison.
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