Beamline 10.0.1 delivers the photons from a 4.5 m long 10 cm periodicity undulator (U100) to various endstations in its
three branchlines. The beamline uses a spherical grating monochromator (SGM) to produce high energy resolution
photon beam, with three gratings to cover the photon energy range from 17 to 340 eV. Typically, angle-resolved
photoemission (ARPES) measurements use 30-70 eV photons. The beam size at the High Energy Resolution
Spectroscopy (HERS) endstation, designed for ARPES, is measured to be 250 μm (H) by 100 μm (V). Due to grazing
incidence geometry in the HERS endstation, the photon beam will have a large projection on the sample surface which
could lead to degradation of experimental resolutions. We are in the process of designing and replacing some of the
existing mirrors to improve the focus spot at HERS endstation. The detailed design parameters and possible upgrade
paths will be presented with verifications using SHADOW ray-tracing program.
ZnSe thin films were prepared by, simple low cost, closed space sublimation method (CSS). The silver doping was
achieved by ion exchange process, i.e. immersing the films in low concentrated silver nitrate solution for different time
periods and flowed by heated treatment in vacuum. The effect of silver concentration on the optical properties , such as refractive index, absorption coefficient and optical band gap, have been calculated from the normal transmission spectra in UV, Visible and NIR region. The structure of the films was studied by X-ray diffraction. The EDS attached to SEM was used to determine the composition of the films. The electrical resistivity, at room temperature, was also measured and it was reduced considerably as silver concentration increased.
In order to fulfill the angular resolution requirements and make the performance goals for future NASA missions
feasible, it is crucial to develop instruments capable of fast and precise figure metrology of x-ray optical elements for
further correction of the surface errors. The Long Trace Profilometer (LTP) is an instrument widely used for measuring
the surface figure of grazing incidence X-ray mirrors. In the case of replicated optics designed for x-ray astronomy
applications, such as mirrors and the corresponding mandrels have a cylindrical shape and their tangential profile is
parabolic or hyperbolic. Modern LTPs have sub-micro radian accuracy, but the measuring speed is very low, because
the profilometer measures surface figure point by point using a single laser beam. The measurement rate can be
significantly improved by replacing the single optical beam with multiple beams. The goal of this study is to
demonstrate the viability of multi-beam metrology as a way of significantly improving the quality and affordability of
replicated x-ray optics. The multi-beam LTP would allow one- and two-dimensional scanning with sub-micro radian
resolution and a measurement rate of about ten times faster compared to the current LTP. The design details of the
instrument's optical layout and the status of optical tests will be presented.
Systematic error and instrumental drift are the major limiting factors of sub-microradian slope metrology with state-of-the-art x-ray optics. Significant suppression of the errors can be achieved by using an optimal measurement strategy
suggested in [Rev. Sci. Instrum. 80, 115101 (2009)]. Here, we report on development of an automated, kinematic,
rotational system that provides fully controlled flipping, tilting, and shifting of a surface under test. The system is to be
integrated into the Advanced Light Source long trace profiler, LTP-II, allowing for complete realization of the
advantages of the optimal measurement strategy method. We describe in detail the system's specification, design
operational control and data acquisition. The performance of the system is demonstrated via the results of high precision
measurements with a number of super-polished mirrors.
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