Overview of the 7-BM beamline

    The 7-BM beamline is dedicated to time-resolved measurements of complex fluid flowfields using x-ray radiography and fluorescence spectroscopy. 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.


    Beamline Performance

    • Total flux: 4 x 1011 ph/s at 8 keV
    • Energy range: 5 - 9 keV, 3.2% ΔE/E; 9-17 keV at 1.0% ΔE/E
    • Focus spot size: 5 x 6 μm FWHM
    • Detection bandwidth: up to 6.5 MHz

    Status of 7-BM

    NEW IN 2014: The addition of new striped multilayers has increased the flux at 5-9 keV by a factor of 2-3 from the previous beamline configuration, while extending the upper energy limit to 17 keV. K-edge fluorescence of elements up to Sr is now possible.

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


    History of 7-BM

    The two BM enclosures, A and B were built by Howard University (MHATT-CAT) in 1997. The enclosure radiation shielding was validated towards the end of 1997. Several standard components purchased from Oxford Instruments for 7-BM were also procured (L3 slit, P6-20 mode shutter). Jin Wang's group (XSD) built a double-crystal multilayer monochromator, which was first installed and commissioned on 1-BM. In 2007, staff from Argonne's Center for Transportation Research and XSD obtained capital funds from the DOE Office of Energy Efficiency and Renewable Energy to develop a station for time-resolved spray radiography in 7BM-B. The project Final Design Report was approved in Nov. 2008. First light in the 7BM-B hutch occurred in March 2009, and the beamline commissioning was completed in FY 2012.

    Alan Kastengren, XSD