4-BM External Website

Beamline 4-BM

  • General Information
    • Source Type
      3-pole wiggler (3PW)

      Construction and Commissioning

      General User Beamtime

      Energy Range Category
      Hard X-Ray (1-50 keV)

      Energy Range
      2 - 23 keV or pink

      Beamline Type
      Participating Research Team (PRT)

      Beamline Description
      XFM is unique as a spectroscopy beamline because it spans the tender (2-5 keV) and hard (5-23keV) energy range (P to Tc K-edges), and also offers a polychromatic "pink" mode ideal for rapid 2D and 3D fluorescence imaging and tomography. It employs compound focusing to achieve a user-tunable spot size from 1 to 10 microns while maintaining a long working distance for physically large samples and custom in situ environmental cells. If desired, a pre-focused bulk (1x1mm) beam is available at the sample position for medium energy powder XRD and bulk EXAFS measurements.

      X-ray Absorption Micro/Nanoprobe
      X-ray Diffraction Micro/Nanoprobe
      X-ray Fluorescence Micro/Nanoprobe
      X-ray Micro/Nano Spectroscopy
      X-ray Absorption Spectroscopy
      X-ray Absorption Spectroscopy, Extended Fine Structure
      X-ray Absorption Spectroscopy, Near Edge Fine Structure
      X-ray Diffraction, Powder

      Research Types
      Materials and Nanoscience; Energy Science; Chemistry and Catalysis; Climate, Earth and Planetary science; Life and Biological Science; Molecular Environmental Science; Cultural Heritage, and many more!

  • 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.
      Ryan Tappero, Brookhaven National Laboratory, rtappero@bnl.gov, 344-5245

      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.
      Alvin Acerbo, University of Chicago, aacerbo@uchicago.edu, 9144171002

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

      Beamline Phone

  • Instrumentation
    • Beamline Characteristics

      Energy RangeMono Crystal or GratingResolution (ΔE/E)FluxSpot Size (mm)Total Angular Acceptance (mrad)
      2 - 23 keV Si(111) 2 x 10-4 (Δλ/ λ) 2 x 1011 ph/sec user tunable from 1 - 10 microns or 1 mm 0.12 x 0.40 mrad
      4 - 20 keV Si(311) 2.5 x 10-5 (Δλ/ λ) 4 x 1010 ph/sec user tunable from 1 - 10 microns or 1 mm 0.12 x 0.40 mrad
      "pink" to 23 keV n/a n/a 2 x 1015 ph/sec user tunable from 1 - 10 microns or 1 mm 0.12 x 0.40 mrad

      Source Type
      3-pole wiggler (3PW)

      Optical System
      Compound focusing: Toroidal macro-focusing mirror illuminates a secondary source aperture (SSA), and a pair of KB micro-focusing mirrors is used to image the secondary source; beam diverging from the SSA is collimated vertically with a bent flat mirror and monochromated with Si(111) or Si(311) crystal pairs.

      Experimental Apparatus
      Vortex ME4 SDD with Quantum Xspress3 DXPs or Canberra 13-element Germanium Array detector with XIA XMAPS DXPs. MAIA-384 detector with custom FPGA electronics. Rayonix 165 CCD detector or MAR 345 image plate. Ion chambers and photodiode detectors. XYZ-theta high-resolution motorized sample position stages. Motorized experimental tables (5-degrees of freedom). CCD-coupled optical microscopes with epifluorescence capabilities. Peltier cold stage (-20C), Linkham cryostage (-150C), and cryostream sample cooling capabilities.

      Computer System Hardware & Software
      Beamline components are controlled by EPICS 3.14 using VME. The user interface is through the Python and Control System Studio (CSS) clients. The user views the experimental system (sample and the surrounding environment) through CCD-coupled optical microscopes with Prosilica cameras. Windows 7 workstations running Python and CSS clients; Linux Debian running IOCs and CSS clients.

  • Links