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A plane grating monochromator for the new undulator at Aladdin: 8–240 eV

1994; Elsevier BV; Volume: 347; Issue: 1-3 Linguagem: Inglês

10.1016/0168-9002(94)91898-8

1872-9576

R. Reininger, Sherry L. Crossley, M.A. Lagergren, M. Severson, R. W. Hansen,

Optical Coatings and Gratings

A comparative study on the expected performance of two monochromator designs for the new undulator beamline at the Aladdin storage ring is reported. The undulator, a 3.5 m device, will cover the energy range 8–240 eV in the first and third harmonic. The flux and resolution of a stigmatic plane grating monochromator (PGM) equipped with an entrance slit and of a spherical grating monochromator (SGM) with a movable exit slit were calculated analytically and by means of ray-tracings. The PGM design, tuned to a resolving power of 104, can deliver more than 1012 photons/s at the sample position in the photon energy range 20–170 eV. The illuminated spot size at the sample position will be less than 500 μm (horizontal) by 50 μm (vertical). This performance is not achieved with the SGM design.