Keyword: laser
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MOPC03 Diamond Refractive Optics Fabrication by Laser Ablation and at-Wavelength Testing optics, synchrotron, FEM, experiment 59
 
  • S.P. Antipov, E. Gomez
    Euclid TechLabs, Solon, Ohio, USA
  • R. Celestre, T. Roth
    ESRF, Grenoble, France
 
  Funding: SBIR grant #DE-SC0013129
The next generation light sources will require x-ray optical components capable of handling large instantaneous and average power densities while tailoring the properties of the x-ray beams for a variety of scientific experiments. Diamond being radiation hard, low Z material with outstanding thermal properties is proposed for front pre-focusing optics applications. Euclid Techlabs had been developing x-ray refractive diamond lens to meet this need. Standard deviation of lens shape error figure gradually was decreased to sub-micron values. Post-ablation polishing procedure yields ~ 10nm surface roughness. In this paper we will report on recent developments towards beamline-ready lens including packaging and compound refractive lens stacking. Diamond lens fabrication is done by femtosecond laser micromachining. We had been using this technology for customization of other beamline components. Several application cases will be highlighted in this presentation: diamond anvils, x-ray flow cells and in-beam mirrors.
 
poster icon Poster MOPC03 [1.754 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-MOPC03  
About • paper received ※ 21 July 2021       paper accepted ※ 01 October 2021       issue date ※ 01 November 2021  
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TUOA02 Conceptual Design of the Cavity Mechanical System for Cavity-Based X-Ray Free Electron Laser FEL, cavity, vacuum, electron 103
 
  • D. Shu, J.W.J. Anton, L. Assoufid, W.G. Jansma, S.P. Kearney, K.-J. Kim, R.R. Lindberg, S.T. Mashrafi, X. Shi, Yu. Shvyd’ko, W.F. Toter, M. White
    ANL, Lemont, Illinois, USA
  • H. Bassan, F.-J. Decker, G.L. Gassner, Z. Huang, G. Marcus, H.-D. Nuhn, T.-F. Tan, D. Zhu
    SLAC, Menlo Park, California, USA
 
  Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract DE-AC02-06CH1 1357 (ANL) and DE-AC02-76SF00515 (SLAC).
The concept behind the cavity-based X-ray FELs (CBXFELs) such as the X-ray free-electron laser oscillator (XFELO)* and the X-ray regenerative amplifier free-electron laser (XRAFEL)** is to form an X-ray cavity with a set of narrow bandwidth diamond Bragg crystals. Storing and recirculating the output of an amplifier in an X- ray cavity so that the X-ray pulse can interact with following fresh electron bunches over many passes enables the development of full temporal coherence. One of the key challenges to forming the X-ray cavity is the precision of the cavity mechanical system design and construction. In this paper, we present conceptual design of the cavity mechanical system that is currently under development for use in a proof-of-principle cavity-based X-ray free electron laser experiment at the LCLS-II at SLAC.
*Kwang-Je Kim et al., TUPRB096, Proceedings of IPAC2019
**Gabe Marcus et al., TUD04, Proceedings of IPAC2019
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-TUOA02  
About • paper received ※ 02 August 2021       paper accepted ※ 05 October 2021       issue date ※ 30 October 2021  
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TUPB15 Fabrication of the Transition Section of a Corrugated Wakefield Accelerator via Laser Micromachining GUI, wakefield, simulation, radiation 175
 
  • P. Bado, M. Dugan, A.A. Said
    Translume, Inc., Ann Arbor, Michigan, USA
  • A.E. Siy
    UW-Madison, Madison, Wisconsin, USA
  • K.J. Suthar, A. Zholents
    ANL, Lemont, Illinois, USA
 
  Funding: This manuscript is based upon work supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-06CH11357
A cylindrical, corrugated wakefield accelerating (CWA) structure is being designed to facilitate sub-terahertz Cerenkov radiation produced by an electron bunch propagating in a waveguided structure comprising accelerating sections and transition sections*. The accelerating structure consists of several copper-based 50-cm long sections of internally corrugated tubes with 2-mm inner-diameter. These sections are coupled together using transition sections, which are also copper-based. The transition section has a main body diameter ranging from 2mm to 3.2mm and its length is about 14mm. Two sets of four orthogonal waveguides radiate from the central body. Beside their mechanical coupling function, these transition sections provide for periodic monitoring of the centering of the electron bunch, and for removal of unwanted higher-order EM modes. The fabrication of these transition sections is presented. The fabrication process is based on the use of a sacrificial fused silica glass mandrel, whose body corresponds to the inner volume of the copper element. This fused silica mandrel is subsequently electroplated. The micro-fabrication of a prototype of the transition section is underway. Modelling of various fabrication errors was undertaken to understand their effect and to determine tolerances. Source of machining imperfections are reviewed and their impact compared to the modelling results.
*A. Zholents et al., "A conceptual design of a Compact Wakefield Accelerator for a high repetition rate multi user Xray Free-Electron Laser Facility," in Proc. 9th Int.l Particle Accel. Conf., 2018
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-TUPB15  
About • paper received ※ 27 July 2021       paper accepted ※ 19 October 2021       issue date ※ 30 October 2021  
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TUPC09 Progress of Nano-Positioning Design for the Coherent Surface Scattering Imaging Instrument for the Advanced Photon Source Upgrade Project photon, alignment, detector, scattering 196
 
  • J.W.J. Anton, M. Chu, Z. Jiang, S. Narayanan, D. Shu, J. Strzalka, J. Wang
    ANL, Lemont, Illinois, USA
 
  Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
As part of the Advanced Photon Source Upgrade (APS-U) project, the Coherent Surface Scattering Imaging (CSSI) [1] instrument is currently being developed. One of the most important components of the CSSI instrument at the 9-ID beamline of the APS-U, the Kirkpatrick-Baez (K-B) mirror system, will focus hard X-rays to a diffrac-tion-limited size of 500 nanometers at a working distance of 550 mm. High angular stability (19 nrad for the hori-zontal mirror and 14 nrad for the vertical mirror) is speci-fied no just for the focused beamsize but, more important-ly, to ensure the beam stability at the detector position that is up to 24 m from the K-B mirrors. A large sample-to-detector distance (up to 23 m), one of the beamline’s unique features for achieving a sufficient coherent-imaging spatial oversampling, requires sample angular stability of 50 nrad. In CSSI scattering geometry, the vertically placed sample reflects X-rays in the horizontal direction at an extremely shallow angle. The design in-cludes two high-precision rotary stages for sample pitch (vertical axis) and yaw (horizontal axis). The current design of instrument’s nano-positioning stages [2] and metrology required to satisfy the stability and positioning requirements are discussed in this paper.
*T. Sun et al., Nat. Photonics 6, 586 (2012).
**D. Shu et al., this conference.
 
poster icon Poster TUPC09 [1.252 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-TUPC09  
About • paper received ※ 13 August 2021       paper accepted ※ 16 October 2021       issue date ※ 27 October 2021  
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WEOB03 Development of a Linear Fast Shutter for BM05 at ESRF and BEATS at SESAME controls, synchrotron, radiation, SRF 229
 
  • C. Muñoz Pequeño, J.M. Clement, P. Thevenau, P. Van Vaerenbergh
    ESRF, Grenoble, France
 
  This paper presents the design of a new linear fast shutter for topography and tomography. A prototype will be assembled and tested at the BM05 beamline at ESRF, and another unit will be installed in the future BEATS beamline at SESAME. The application of the shutter in X-ray diffraction topography allows performance of long exposure cycles of monochromatic beam on crystal samples while preventing irradiation of the detector during readout. It can be also used during sample alignment and acquisition of X-ray tomography scans. Particularly for white-beam tomography, which uses a very high photon flux, minimizing exposure is critical to protect the sample and detector from radiation damage. This highlights the importance of obtaining a short and uniform exposure time over the beam aperture. To fulfill this objective, a new shutter based on the synchronization of two tantalum blades driven by linear brushless DC motors is under development. This versatile design can be used with both monochromatic and white-beam, and it can achieve exposure times ranging from 50 ms to 60 s for a beam size of H 80 mm x V 20 mm. The linear motors allow for a much smoother operation, preventing vibration issues reported with the old shutter. In addition, the use of linear motors rather than solenoids allows an unlimited exposure time, where the previous version used solenoids that could overheat if kept open for too long. A test bench has been constructed for the characterization of the sequence produced by the linear motors, and exposure times of 50 ms with a maximum error of 1 ms have been measured. This article describes the main features of the shutter prototype and its associated motion control system, and the results of the measurements with the motor test bench are discussed as well.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-WEOB03  
About • paper received ※ 18 July 2021       paper accepted ※ 19 October 2021       issue date ※ 02 November 2021  
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WEPB15 A Novel Vacuum Chamber Design for the APS Upgrade of the 26-ID Nanoprobe vacuum, detector, instrumentation, synchrotron 296
 
  • S.J. Bean, P.N. Amann, M. Bartlein, Z. Cai, T. Graber, M. Holt, D. Shu
    ANL, Lemont, Illinois, USA
 
  Funding: Used resources of the CNM and the APS, a U.S. Department of Energy (DOE) Office of Science User Facility, operated for the DOE Office of Science by ANL under Contract No. DE-AC02-06CH11357.
An enhancement design of an existing 26-ID nanoprobe [1] instrument (NPI) at APS is being completed as part of work for the APS-Upgrade (APS-U) project. As part of this enhancement design, a new vacuum chamber geometry configuration has been implemented that balances the desired simultaneous x-ray measurement methods with accessibility and serviceability of the nanoprobe. The main enabling feature on the vacuum chamber is a slanted mid-level vacuum sealing plane. The new chamber design geometrically optimizes the ability to perform simultaneous diffraction, fluorescence and optical or laser pump probe measurements on the sample. A large diffraction door geometry is strategically placed near the sample for ease of access. The newly designed chamber can be readily serviced by removal of the upper chamber section, on which most larger instrument assemblies or beamline attachments are not interfaced. The mechanical design intent and geometry of this chamber concept is described in this paper.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-WEPB15  
About • paper received ※ 12 August 2021       paper accepted ※ 19 October 2021       issue date ※ 08 November 2021  
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WEPC05 An Improved, Compact High Temperature Sample Furnace for X-Ray Powder Diffraction shielding, GUI, radiation, FEL 317
 
  • E. Haas
    BNL, Upton, New York, USA
  • E. Cardenas
    NYIT, Old Westbury, New York, USA
  • A.P. Sirna
    SBU, Stony Brook, New York, USA
 
  A compact sample furnace was designed and tested at the X-ray Powder Diffraction (XPD) beamline at NSLS-II. This furnace is designed to heat small samples to temperatures of 2000 - 2300°C while allowing the XPD photon beam to pass through with adequate downstream opening in the furnace to collect diffraction data. Since the XPD samples did not reach the desired temperatures initially, engineering studies, tests, and incremental improvements were planned and undertaken to improve performance. The design of the sample furnace will be presented as background, and engineering details will be presented in this paper describing work undertaken to improve the furnace design to allow sample temperatures to reach 2000 - 2300°C or more.  
poster icon Poster WEPC05 [0.534 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-WEPC05  
About • paper received ※ 26 July 2021       paper accepted ※ 17 October 2021       issue date ※ 31 October 2021  
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WEPC13 Sample and Detector Positioning Instruments for the Wide Angle XPCS End Station at 8-ID-E, a Feature Beamline for the APS Upgrade detector, photon, scattering, lattice 333
 
  • K.J. Wakefield, S.J. Bean, D. Capatina, E.M. Dufresne, M.V. Fisher, M.J. Highland, S. Narayanan, A. Sandy, R. Ziegler
    ANL, Lemont, Illinois, USA
 
  Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
The X-ray Photon Correlation Spectroscopy (XPCS) beamline at the Advanced Photon Source (APS) has been selected as one of the nine feature beamlines being de-signed to take advantage of the increase in coherent flux provided by the APS Upgrade. The 8-ID-E enclosure at the beamline will have a dedicated instrument for per-forming Wide Angle XPCS (WA-XPCS) measurements across a range of length and time scales. The instrument will feature a high-stability 6-circle diffractometer, a moveable Long Distance Detector Positioner (LDDP) for positioning a large pixel array detector, and a removable flight path assembly. For intermediate sample to detector distances of 1.5 to 2 meters, a large pixel array detector will be positioned on the diffractometer detector arm. For longer sample to detector distances up to 4 meters, an horizontal scattering geometry will be utilized based on the LDDP to position a second large pixel array detector. The LDDP will consist of a large granite base on which sits a combination of motorized stages. The base will sit on air casters that allow the LDDP to be coarsely posi-tioned manually within the enclosure. Final positioning of the detector will be achieved with the mounted stages. The spatial relationship between the sample and the free moving LDDP will be monitored using a laser tracking system. A moveable flight path will be supported by the diffractometer arm and a mobile floor support to mini-mize air scattering while using the LDDP. The WA-XPCS instrument has been designed with users and beamline staff in mind and will allow them to efficiently utilize the highly enhanced coherent beam provided by the APS Upgrade.
 
poster icon Poster WEPC13 [1.363 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-WEPC13  
About • paper received ※ 12 August 2021       paper accepted ※ 29 October 2021       issue date ※ 01 November 2021  
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THOA03 Alignment Strategies and First Results on Sirius Beamlines network, alignment, synchrotron, vacuum 349
 
  • G.R. Rovigatti de Oliveira, H. Geraissate, R. Junqueira Leão
    LNLS, Campinas, Brazil
 
  The new Brazilian Synchrotron Light Source had its first friendly users late in 2019. During 2020, the first experimental stations were aligned and had the first beam successfully at the sample. The reference network of points used for the storage ring alignment was connected to an external network located in the experimental hall. Following this step, it was possible to extend these references to the hutches environment, where the beamlines components are installed. During the alignment of the first beamlines, a sequence of common tasks was performed, from the bluelining of the hutches footprints, to the components fine alignment. The position and orientation deviation of the main components will be presented for the Manacá, Cateretê, Ema, and Carnaúba beamlines. Two specific measurement strategies used for aligning special components will also be presented: (1) an indirect fiducialization procedure developed for most of the mirrors and their mechanisms using a mix of coordinate measuring machine and articulated measuring arm measurements, and (2) a multi-station setup arranged for the alignment of a 30 meters long detector carriage, using a mix of laser tracker, physical artifacts, and a rotary laser alignment system used as a straightness reference.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-THOA03  
About • paper received ※ 28 July 2021       paper accepted ※ 13 October 2021       issue date ※ 28 October 2021  
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