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X17C is a superconducting wiggler white x-ray beam line. It is dedicated to high pressure diamond anvil cell research. The energy dispersive x-ray diffraction (EDXD) technique is used. The principle is based on the Bragg relation, which can be expressed as:

                                E (keV) = 6.1993 / d (Å) sin q

 Since 2003 X17C has developed angle dispersive x-ray diffraction (ADXD) with a Sagitally bent Laue monochromator. The monochromatic beam energy range can be from 20 keV to 40 keV. The detector is Fuji image plate.

 X17C is a facility beam line at the NSLS of BNL. It is running by The University of Chicago. It is funded by NSF of US through COMPRES (COnsortium for Materials Properties Research in Earth Sciences).

 Good news : COMPRES provides limited funds to support Earth science users dormitory accommodation

1. Beam line parameters:

        EDXD

• X-ray energy range: 5 - 100 keV , MCA set at 5 - 80 keV
• Wiggler magnetic field B: 4.2 T at 2.8 GeV
• Beam dimension: 1 mm x 1 mm - 0.01 mm x 0.01 mm
• Diffraction 2q angle: above 7 degree

          ADXD

• Monochromatic beam energy can be 20 - 40 keV.  (wavelength 0.62 - 0.31Å)
•  Beam dimension: 0.2 mm x 0.2   - 0.02 mm x 0.012mm
• Sample to detector distance:150 mm - 350 mm  
• Photon flux is 6x10⁸ photons/s (10¹² ph/s/mm²) at 30 keV, divergence is 1 mrad by 1 mrad.  Energy bandwidth is 10^-4 dE/E..       

2. Research program:

• EDXD and ADXD for polycrystalline samples in diamond cells up to 300 GPa at ambient temperature. 
• EDXD for resistively heated polycrystalline samples in diamond cells up to 1100K at 100 GPa. 
• Single-crystal x-ray diffraction up to 100 GPa. 
• Single-crystal x-ray diffraction for microscopic samples below 1 micron.
• Ruby fluorescence spectroscopic system for pressure calibration. 
• Off-line laser-heating equipment for temperatures up to 4000K at high pressure.

3. Facility:

• Radiation hutch
• ADXD setup 
• Hutch layout
• Sample preparation lab
• Ruby pressure measuring system
• Computing

4. Publications

•   Publication - 1999
•   Publication - 2000
•   Publication - 2001
•   Publication - 2002
•   Publication - 2003
•   Publication - 2004
•   Publication - 2005
•   Publication - 2006

5. Beam time application

      Beam time application:  Submitting proposal and beam time requesting are through NSLS PASS system. There are 3 cycles of beam time in a year.

      Application deadline: Jan - April  is Sept. 30; May - August is Jan. 31; Sept - Nov is May 31.

6. More information:

•   http://www.nsls.bnl.gov/
•   http://www.compres.stonybrook.edu/

7. Beam line faculty

    Spokesperson: Mark Rivers, The University of Chicago,

                             (630)252-0422, rivers@cars.uchicago.edu

    Local contact person: Jingzhu Hu, The University of Chicago,
                              (631)344-5343, jzhu@bnl.gov

    Local contact person: Quanzhong Guo, The University of Chicago ,
                              (631)344-5343, qguo@bnl.gov

This page is maintained by Jingzhu Hu.

            Please send comments, to: jzhu@bnl.gov
            Tel: (631)344-5343(o), (631)344-5917 (beam line)
            Fax: (631)344-7078
            Last revised : Sept. 2006