Beamline X24C

  • General Information
    • Source Type
      Bending magnet

      Status
      Unused Port

      General User Beamtime
      0%

      Energy Range
      .006-1.8 keV

      Beamline Type
      Participating Research Team (PRT)

      Beamline Description
      Photoemission and reflectance spectroscopy. This beamline ranges from the vacuum ultraviolet up to soft x-rays. Light from the synchrotron is collimated with a platinum-coated fixed-curvature toroidal mirror (M1). The monochromator has a double crystal type scanning motion and uses either gratings or crystals in vacuum with in-situ exchange. The dispersive elements include a 600 grooves/mm grating with a 2 degree blaze and gold coating, a 2400 grooves/mm grating with a 2 degree blaze and gold coating, a 150 l/mm grating with a 2 degree blaze, a multilayer test grating that has 4 degree blaze and 2000 grooves/mm pitch coated with 8.0 nm 2D W/C multiplayer. Light is focused onto an exit slit with a platinum-coated fixed-curvature toroidal mirror (M2) identical to M1. A reflectometer is mounted in an 18" diameter UHV bell jar with sample adjustable in angle of incidence and orientation around sample normal and a detector mount capable of being set at a fixed distance but any angle about sample. The reflectometer chamber can be rotated to alter polarization. Sample preparation and introduction are performed using an auxiliary UHV chamger attached to the side of the reflectometer. Another calibration chamber mounted downstream of the reflectometer can accommodate multiple samples with large sample size. The sample and detector translational and angular motions are controlled by XDAC software. No corrosive or non-UHV compatible materials allowed.

      Technique(s)
      X-ray reflectivity
      Ultraviolet photo absorption spectroscopy
      X-ray absorption spectroscopy

      Institution(s)
      Artep Corporation
      SFA, Inc.
      United States Naval Research Laboratory (NRL)

      Research Types
      Reflectance and photoemission spectroscopy.

  • Contact Information
    • Spokesperson The person from each beamline who acts as a contact point between the beamline management and NSLS administration. Contact for questions about the beamline scientific program, experimental capabilities, and beamline management.
      Jeff Morrill, United States Naval Research Laboratory (NRL), jeff.morrill@nrl.navy.mil, 2024047826

      Local Contact The beamline staff member who is typically responsible for overseeing the daily operation and maintenance of the beamline. Contact for questions about beamline instrumentation, experimental details, and training.
      Johnny Kirkland, Global Defense Technology and Systems, Inc. (GTEC), kirkland@bnl.gov, 6313445824

      Beamtime Scheduler The beamline staff member responsible for coordination of beamline schedule every trimester. Contact for questions about beamtime scheduling.

      Beamline Phone
      631-344-5824

  • Instrumentation
    • Beamline Characteristics

      Energy RangeMono Crystal or GratingResolution (ΔE/E)FluxSpot Size (mm)Total Angular Acceptance (mrad)
      10 – 460 eV 600 grooves/mm 2 x 10-3 109 - 1012 ph/sec 2.0H x 1.2V 6
      250 – 950 eV 2400 grooves/mm 2 x 10-3 or 8 x 10-4 108 - 1010 ph/sec 2.0H x 1.2V 6
      800 - 2000 eV multilayer mirrors 3% 109 - 1011 ph/sec (@ 3%) 2.0H x 1.2V 6
      1.6-12 eV 150 grooves/mm 2.5e-3 108 - 1010 ph/sec 2.0H x 1.2V 6




      Source Type
      Bending magnet

      Optical System
      Mirror 1: Platinum-coated, fixed-curvature toroidal mirror (M1); beam collimated into monochromator; 2 degree grazing angle; full orientation control; located 10 meters from the source. Monochromator: Grating/crystal monochromator; double crystal type scanning motion; uses either gratings or crystals in vacuum with exchange; 3.5 - 85.0 degree grazing angle range; 600 grooves/mm grating has a 2 degree blaze and is gold coated; 2400 grooves/mm grating has a 2 degree blaze and is gold coated; 150 grooves/mm grating has a 2 degree blaze; multilayer mirrors is W/B4C coated. Mirror 2: Platinum-coated, fixed-curvature toroidal mirror (M2) identical to M1; beam focused onto fixed exit slit 26 meters from the source yielding 1:1 image of source; 2 degree grazing angle; full orientation control; located 16 meters from the source.

      Experimental Apparatus
      A reflectometer mounted in an 18" diameter UHV bell jar with sample adjustable in angle of incidence and orientation around sample normal, detector mount capable of being set at a fixed distance but any angle about sample, whole chamber rotation to alter polarization, and sample preparation/introduction from an auxiliary UHV chamber. No corrosive or non-UHV compatible materials allowed. Calibration chamber with inside dimensions 63” long x 24” diameter, sample translational and angular motions, and 1 cmx1cm Si photodiodes and 2"x2” CMOS area detectors.

      Computer System Hardware & Software
      Apple Power MC G4 with Mac OS 9: XDAC Labview-based software for data acquisition and control of monochromator and sample/detector motions for the reflectometer and calibration chamber.

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