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Figure 4
The justification for our third-order instrument design: the same resolution can be achieved using the third order, or using another grating with three times the groove density in the first order. When optimizing for 280 eV (top) we find that a properly optimized 1800 lines mm−1 grating in the third order has higher efficiency than the optimized 5400 lines mm−1 grating in the first order. This is true for sinusoidal (red) as well as blazed profiles (blue). When optimizing for 710 eV (bottom), the third-order grating has comparable but slightly lower efficiency than the first-order alternative. However, it would be impossible to rule a 7800 lines mm−1 grating with acceptable quality, so the third-order grating is the only practical choice.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 20| Part 2| February 2013| Pages 272-285
doi:10.1107/S0909049512051266
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