Seya Namioka Monochromator for synchrotron beamline applications 5 to 40-eV Index between 3 gratings under vacuum Resolution (E/ΔE) = 5,000 Internal or heat sink grating cooling UHV construction for 10^-10 torr operation Bakeable to 150-degrees C

McPherson Seya Namioka Monochromators (SNM) have a long history in physics research applications. A little of the history about the Seya Namioka development is described here (PDF.) The Seya Namioka is a simple monochromator design, it requires only grating rotation to change wavelength. Not so simple, the calculated optimization of the best angle of incidence to use. Once this was determined, the Seya Namioka design found great popularity in any experimental application that required large separation between entrance and exit slits. It is manufactured today as McPherson Model 231. It has found use at synchrotrons such as SSRL and NSSRC. The latter link has a very nice description of the implementation of the Seya Namioka monochromator for beam line applications. McPherson delivered this 1-meter focal length ultra high vacuum Seya-Namioka monochromator from entrance slit to exit slit. It provides unique branches on entrance and exit slit to allow light from several directions. In addition, it features a triple grating turret, stepper and encoder drive system, and in vacuum adjustable slits.

McPherson ultra high vacuum (UHV) instruments are baked and RGA tested prior to shipment. Unique proven McPherson designs separate support members for chambers and precision grating mechanism. This for reduced sensitivity to vibration and thermal environmental factors. Scan grating angle by computer control and use rotary or laser tilt encoders for absolute feedback. Index gratings under vacuum, manually or by motor control. We have a variety of beam line instruments and accessories available.