Precision mechanics
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TUPB08 High-Precision Synchrotron Kappa Diffractometer 163
  • G. Olea, N. Huber, J. Zeeb
    HUBER Diffraktiontechnik GmbH&Co.KG, Rimsting, Germany
  A new research product aiming to work in a 3th generation synchrotron facility (PAL/PLS II) has been developed. Based on increased energy X-ray synchrotron radiation tool and well-known Kappa geometry device principle, the product is expected that will investigate atomic and molecular structures of materials at nanoscale level using several X-ray diffraction techniques. The Kappa diffractometer (K-Dm) machine is maintaining the common structural principle of its family, but working with an extreme precision and load, which is far of the competition. The main body is consisting from customized Kappa goniometer (KGm) device with vertical axis of rotation for high-precision sample (cryostat) manipulation, versatile detector arm (Da) for manipulating in horizontal plan different detectors (optics, slits, etc.) after X-ray beam is scattered and stable alignment base (Ab) for roughly adjusting the product around the X-ray beam. In addition, a XYZ cryo-carrier inside of the KGm is included for fine (submicron) sample adjustments. The kinematic, design and precision concepts applied, together with the obtained test results are all in detail presented.*
* HUBER Diffraction and Positioning GmbH&Co.KG,
DOI • reference for this paper ※  
About • paper received ※ 16 July 2021       paper accepted ※ 16 October 2021       issue date ※ 28 October 2021  
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New UHV Angle Encoder for High Resolution Monochromators, a Modern Spare Part for the Heidenhain UHV Ron 905  
  • F. Eggenstein, L. Schwarz, J. Viefhaus, T. Zeschke
    HZB, Berlin, Germany
  A large number of soft X-ray monochromators for high-resolution synchrotron radiation experiments are in operation worldwide. Many of them being plane-grating monochromators with HEIDENHAIN UHV RON905 angle encoders, thirty-six of those encoders are in use at BESSY II. Since decades, those angle encoders are successfully in operation. As of today, this type of encoders became a legacy product and repairing is getting expensive. Therefore, we have developed a new angle encoder, a mechanically compatible "drop-in" replacement of the RON905. A correspondingly manufactured prototype, based on RENISHAW absolute encoders, was investigated on a high precision angle drive test bench. Fourier analysis of the encoder data allowed to determine the accuracy for different angle ranges and shows a better accuracy for the case of the new angle encoder. Furthermore, we will introduce two different methods to increase the system accuracy by plane grating monochromators in collimated light employing the newly developed encoder. The first one is an on-line, in-situ method based on electron/absorption spectroscopy whereas the second, off-line method utilizes an electronic autocollimator.  
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TUPC11 The HD-DCM-Lite: A High-Dynamic DCM with Extended Scanning Capabilities for Sirius/LNLS Beamlines 203
  • A.V. Perna, H.O.C. Duarte, R.R. Geraldes, M.A.L. Moraes, M. Saveri Silva, M.S. Souza, G.S. de Albuquerque
    LNLS, Campinas, Brazil
  Funding: Ministry of Science, Technology and Innovation (MCTI)
After successfully designing, installing, and commissioning two units of the High-Dynamic Double-Crystal Monochromator (HD-DCM) at the Brazilian Synchrotron Light Laboratory (LNLS) - Sirius, two more units are now required. Since they demand only a smaller energy range (5 to 35 keV), the total gap stroke of the new instruments can be significantly reduced, creating an opportunity to adapt the existing design towards the so-called HD-DCM-Lite. Removing the large gap adjustment mechanism allows a reduction of the main inertia by a factor of 5, enabling the HD-DCM-Lite to deliver energy flyscans of hundreds of eV reaching 20 cycles per second while keeping fixed exit and the pitch stability in the range of 10 nrad RMS (1 Hz - 2.5 kHz). Hence, an unparallel bridge between slow step-scan DCMs and fast channel-cut monochromators is created. This work presents the in-house development of the HD-DCM-Lite, focusing on its mechanical design, discussions on the ultimate scanning constraints (rotary stage torque, voice-coil forces, interferometers and encoders readout speed limits and subdivisional errors), and thermal management.
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DOI • reference for this paper ※  
About • paper received ※ 28 July 2021       paper accepted ※ 16 October 2021       issue date ※ 27 October 2021  
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TUPC15 A New Ultra-Stable Variable Projection Microscope for the APS Upgrade of 32-ID 211
  • S.J. Bean, V. De Andrade, A. Deriy, K. Fezzaa, T. Graber, J. Matus, C.A. Preissner, D. Shu
    ANL, Lemont, Illinois, USA
  Funding: Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility, operated for the DOE Office of Science by Argonne National Laboratory under Contract No.DE-AC02-06CH11357
A new nano-computed tomography projection microscope (n-CT) is being designed as part the Advanced Photon Source Upgrade (APS-U) beamline enhancement at sector 32-ID. The n-CT will take advantage of the APS-U source and provide new capabilities to the imaging program at 32-ID. A Kirkpatrick and Baez (KB) mirror-based nanofocusing optics [1,2] will be implemented in this design. To meet the n-CT imaging goals, it is the desire to have sub 10 nanometer vibrational and thermal drift stability over 10-minute measurement durations between the optic and the sample. In addition to the stability requirements, it is desired to have a variable length sample projection axis of up to 450 mm. Such stability and motion requirements are challenging to accomplish simultaneously due to performance limitations of traditional motion mechanics and present a significant engineering challenge. To overcome these limitations, the proposed n-CT design incorporates granite air bearing concepts initially used in the Velociprobe [3]. These types of granite stages have been incorporated into many designs at APS [4] and at other synchrotron facilities [5]. Utilizing the granite air bearing concept, in tandem with other design aspects in the instrument, the requirements become reachable. A novel multi-degree of freedom wedge configuration is also incorporated to overcome space limitations. The design of this instrument is described in this paper.
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About • paper received ※ 12 August 2021       paper accepted ※ 19 October 2021       issue date ※ 02 November 2021  
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WEPA13 Design of a High-Precision Lifting System for the HL-LHC Heavy Components in the Interaction Region 255
  • F. Micolon, M. Sosin
    CERN, Meyrin, Switzerland
  Given the high radiation level and the tight alignment tolerances, the HL-LHC interaction region components are designed to be realigned remotely using motorized supporting jacks, as human interventions in these zones must be limited to the strict minimum. A position adjustment system will allow a vertical and horizontal displacement of each jack support by at least ±2.5 mm with a resolution of less than 10 µm. The weight of the supported elements, up to 170 kN and transverse loads reaching 30 kN, will have to be remotely moved by means of mechanical actuators. The system will be exposed to a cumulated radiation dose of up to 2 MGy during the 15 years of lifetime. To comply with these requirements, an extensive de-sign effort has been initiated at CERN to study the possible system layouts. This includes the prototyping of various solutions, studying subsystems through dedicated test setups and using simulations to obtain a clear under-standing of the mechanical principles at play. This paper reports on the work undertaken to design the high-precision lifting system, the various mechanical analysis carried out, and their main outcome. It reviews the proposed solutions and their expected alignment performance.  
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About • paper received ※ 15 July 2021       paper accepted ※ 19 October 2021       issue date ※ 30 October 2021  
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WEPA14 All Applications of the ALBA Skin Concept 259
  • A. Crisol, A. Carballedo, C. Colldelram, N González, J. Juanhuix, J. Nicolás, L.R.M. Ribó, C. Ruget
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  • L.W.S. Adamson
    ASCo, Clayton, Victoria, Australia
  • J.B. González Fernández
    MAX IV Laboratory, Lund University, Lund, Sweden
  • E.R. Jane
    FMB Oxford, Oxford, United Kingdom
  During the ALBA design phase, the protein macromolecular protein crystallography beamline, XALOC, required several in-house developments. The major part of these designs was at the end station where the necessity of customization is always much higher. The most relevant of these instruments was the beam conditioning elements table [1]. This accurate stage, which supports the diffractometer as well, includes the four movements required to align the components to the nominal beam as well as position the diffractometer. This design compacts, especially the vertical and pitch movements, both in a single stage, with a couple of stages for all four excursions. The solution maximise the stiffness and preserves at the same time the resolution close to 0.1µm while being able to withstand a half tone of payload. Thanks this compactness and performances this design concept, the vertical and pitch combined stage, was not only applied at XALOC for its diffractometer and detector table, but it has been widely adapted at several ALBA beamlines: at NCD-SWEET [2] as a detector table, a beam conditioning elements table [3] and sample table, at MSPD beamline as the KB table, at NOTOS beamline as metrology table, and also at the new ESA MINERVA beamline [4] for their sample mirror modules positioning. Beamlines have not been the only beneficiaries of this design, also different kind of instrumentation like an hall probe measuring bench [5], and even a stitching platform for the ALBA optics laboratory [6]. Moreover, the concept has outreach ALBA and has been adopted also at other facilities worldwide, synchrotrons and also scientific instrumentation suppliers around Europe. This poster presents most of the applications of the skin concept and their variations and main measured performances.  
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About • paper received ※ 29 July 2021       paper accepted ※ 22 October 2021       issue date ※ 09 November 2021  
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A Rapid Two Axis Scanner for Vacuum Environments With High EMP  
  • C. Deiter, M. Kitel, J. Schulz
    EuXFEL, Schenefeld, Germany
  Funding: This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 654220
We present a two axis scanner for the rapid scanning of solid samples up to 10 Hz in vacuum under harsh EMP conditions. The samples are carried by a standardized sample frame system developed in the EUCALL project (2015-2018, WP6 HIREP) and can be transferred without breaking the vacuum conditions of the interaction chamber. All electronic devices inside the chamber, where the high-power laser shot and the FEL’s X-ray pulses hit the sample, can be disconnected with 10 Hz. To ensure a continuous monitoring of the sample’s position, the role of the encoder is taken over by an interferometer with only optical components inside the chamber. The linear stages are powered by high frequency piezo motors capable to do power cycles with up to 1 kHz. The scanner is controlled by the Beckhoff EtherCAT automation system with an in-house software framework.
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