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  • 1990-1994  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 450-450 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In parallel to the design and construction of new synchrotron radiation sources quite important efforts are required to upgrade existing and develop new x-ray optics that is capable of conditioning powerful x-ray beams with minimum losses of brilliance. In the context of these research and development activities a well equipped laboratory is absolutely vital. Such a laboratory must have capabilities to prepare, mount, transfer, align and test optical elements with the high precision that is typical for European Synchrotron Radiation Facility (ESRF) beamline instrumentation, for example, microroughness and slope error of mirrors down to 0.1 nm root mean square and μrad, respectively, and μm and μrad spatial and angular positioning. At ESRF the following facilities presently exist or are being installed: (i) a laboratory for single crystal orientation, cutting, grinding, polishing, and mounting, (ii) three interferometers for optical metrology of surfaces such as figure and finish, all in clean room and thermally stable environment, (iii) a three axis diffractometer for precise x-ray metrology of all kinds of optical elements up to 1-m long, also in clean room and stable environment, (iv) a multilayer fabrication facility featuring sputtering and plasma chemical vapor deposition with in situ x-ray diffraction and ellipsometry controls.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The performance of an adaptive mirror strongly depends on the quality of the overall mirror optimization and on the model on which the control algorithm is based. Fundamental parameters entering the mirror design are: mirror function, source and beam parameters, response time, actuator positions and forces. In a case of a wiggler source, we show that it is possible to decrease the thermal deformation generated by 4 kW absorbed power by a segmented mirror of one meter length from 600 μrad to a few μrad. The discussion is based on detailed mechanical analysis and on ray-tracing simulation.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 489-492 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Adaptive optics were proposed as a solution to heat load problems generated by powerful x-ray beams of next generation synchrotron radiation sources. A first adaptive x-ray mirror prototype is presently under design at the ESRF. This device, which is optimized for a wiggler beamline, is described here. It is composed of three main subsystems: the mirror body, the correction feedback loop including the actuators for the mechanical correction, and the optical setup for inspecting the mirror shape.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 486-488 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The calculation of the spherical aberration, which has been given only in the case of a point source up to now, is extended to the case of source of finite size. It is shown that the real size of the image can be well described by a convolution of the ideal size of the image and the aberrations involved. The expression for an optimum magnification is developed yielding the smallest possible image size for a given optical system in the case of a cylindrical mirror. Calculations are presented for different ESRF sources and the results are compared to simulations performed by the ray-tracing code SHADOW.
    Type of Medium: Electronic Resource
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