Advanced Photon Source

Office of Science User Facilities

7-BM Home

Overview of the 7-BM Beamline

The 7-BM beamline is dedicated to time-resolved measurements of complex fluid flowfields using x-ray radiography, phase contrast imaging, and fluorescence spectroscopy.  High resolution (5 micron) x-ray tomography is also used to complement fluid flowfield measurements.  Funding for the final commissioning of 7-BM was provided by the DOE Office of Energy Efficiency and Renewable Energy. Commissioning was completed at the end of FY2012. The beamline is currently operated by the X-Ray Science Division of the APS.

Major Areas of Research
  • Fuel sprays from automotive fuel injectors, both diesel and gasoline. See more on the X-Ray Fuel Spray web page from Argonne's Energy Systems Division.
  • Sprays for air-breathing propulsion.
  • Fuel injection for rocket injectors.
  • Gas-phase fuel injection, mixing, and combustion.

 

Diesel-Chamber-Smaller.pngMcKenna burner in the x-ray beamline

 

 

 

 

 

 

 

Combined radiography and fluorescence of an aerated spray

Example x-ray tomography of a gasoline direct injection nozzle
Beamline Performance

Monochromatic Beam

  • Total flux: 4 x 1011 ph/s at 8 keV
  • Energy range: 5 - 9 keV, 3.2% ΔE/E; 9-15 keV at 1.0% ΔE/E
  • Focus spot size: 5 x 6 μm FWHM
  • Detection bandwidth: up to 6.5 MHz

White Beam

  • Beam size 12 mm (H) x 5 mm (V)
  • Energy range: 5 - 100 keV
Status of 7-BM

New in FY 2016, 7-BM is now instrumented to perform work using the bending magnet white beam.  This enables high-speed phase contrast imaging, as well as high-resolution hard x-ray tomography, in addition to the beamline's previous capabilites in x-ray fluorescence measurements and high-speed radiography. 

The APS Scientific Software Engineering and Data Management group is currently developing a data portal for dissemination of data collected at 7-BM.  When complete, this data portal will allow outside groups to download rich datasets for spray flowfields, including information on nozzle geometry, injector internal motions, and spray dynamics.

7-BM is currently accepting General Users. Beamtime requests should be made through the APS General User Proposal System.