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| Mouse over the station for more information on the different components
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The First Optics Enclosure (FOE), as the name implies, is the first enclosure or station the X-ray beam encounters on the experimental floor of the APS in our sector. It houses most of the beam conditioning optics, which prepare the high-power X-ray beam for a particular experiment.
The Beryllium Window is a special polished and cooled high heat-load Be window that is transparent to x-rays. X-ray beam transmitted retaining all the original properties of the undulator. Its purpose is to isolate the vacuum in the FOE from the vacuum in the shielded beam transport.
The Integral shutter is the 'light switch' of the FOE, controlling whether or not the beam is allowed to propagate downstream to an experiment. It can also act as a secondary thermal dump.
Mirror B is also used for harmonic rejection as well as realigning the beam reflected from the first mirror so that it is once again parallel to the monochromatic beam.
Mirror A serves two purposes: First, it is used as a low-pass filter that removes high order harmonics present in the x-ray beam. Secondly, it has the ability to focus the beam in the vertical direction. The mirror provides an approximate 1:1 focus at the 60-m mark.
• Angle range 2-5 mrad
• Highest energy passed through both mirrors ~40keV
(70% transmission using Pt stripe at 2 mrad)
• 3 coatings (Si, Rh, Pt)
Thermal Dump
Since most of the high-power beam is transmitted through the diamond crystals in the monochromator, a high-power beam stop is necessary to terminate the polychromatic and protect downstream components.
The Kohzu high heat-load Monochromator produces a monochromatic beam from a polychromatic beam (created by the undulator in the storage ring) using water-cooled diamond crystals.
• KohzuHLD-3 (Bragg-Bragg geometry)
• Energy Range 6-32keV with diamond (111)
• Energy repeatability less than 0.1 eV.
The L5-92 Power-limiting apertures limit the size of the x-ray beam accepted by the monochromator, thus controlling the power loading. They can be remotely controlled during an experiment in order to optimize the photon flux while minimizing the power loading.
The Bremsstrahlung collimator is a safety device that stops high-energy bremsstrahlung gamma rays produced in the storage ring from propagating to the experimental floor.
The Differential pump isolates the vacuum in the storage ring from the vacuum in the beamline.
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