GCPCC Beamline 

    The GCPCC beamline is located at the Center for Advanced Microstructures and Devices (CAMD), which is operated by Louisiana State University.  The CAMD synchrotron is a second generation source that is currently operated at 1.3 GeV with an injection current of 100 mA and 2 fills per day.

    The GCPCC beamline utilizes 1.5 mrad of the output of a 11-pole 7.5 Tesla super conducting wiggler. The x-rays are collimated vertically by a fixed radius cylindrical mirror, monochromatized by either a channel-cut monochromator or a multilayer monochromator and focused by a toroidal mirror with an adjustable major radius.

    The channel-cut monochromator is designed for MAD data collection and  has a channel-cut Si crystal in the 111 orientation.  The bandpass (Δλ/λ) is approximately 2x10-4.  The multilayer monochromator will have a bandpass of about 5x10-3 which will greatly increase the x-ray flux on the sample.   The bandwidth from the multilayer system will be too large for MAD use but will be good for most other data collection from crystals with a unit cell of less than about 200 Å.   It is possible to switch between the 2 monochromators depending on the requirements of the experiment.

    Source

    • Ring energy: 1.3 GeV
    • Ring current (at injection): 100 mA - 2 fills per day
    • Insertion Device: 7.5 T superconducting, 11-pole wiggler

    Optics

    • Vertical collimating mirror
    • Monochromator, either multilayer or Si(111) channel cut crystal
    • Toroidal focusing mirror

    Beam Characteristics

    With Si(111) Channel Cut Crystal Monochromator

    • Energy range: 7.0 - 17.5 keV  (1.77 Å - 0.71 Å)
    • Bandpass: Δλ/λ: 2.0x10-4
    • Spot size, horizontal x vertical (FWHM): 1.6 mm x 0.4 mm

    With Multilayer Monochromator   (not yet in service)

    • Energy range: 9 - 13 keV (1.38 Å - 0.95 Å)
    • Bandpass: Δλ/λ :
    • Spot size, horizontal x vertical (FWHM):

    Station

    • Sample positioning: Mar Research dtb single-axis goniostat

    Chi motion for crystal mounting (0 - 60°) Motorized sample alignment (Marxy) system

    • Sample to detector distance: 50 - 300 mm
    • Detector theta: 0° - 30°
    • Sample temperature control: Oxford Instruments CryoJet (100 K - room temperature)
    • Detector: Mar165 CCD detector
    • Fluorescence detector: Oxford Cyberstar

    Other equipment/facilities available

    • Incubators (0 - 50° C)
    • Storage dewar
    • Small dewars
    • Hampton cryotools
    • Stereo microscopes   (with polarizer available)
    • Anaerobic chamber
    • Wet lab with fume hood, balances, centrifuges etc.

    Computers and Software

    The beamline has computers running Linux (RHEL and Centos) with the following crystallographic software:

    • CCP4
    • HKL-2000
    • Phenix
    • Coot

    Data are stored on a Network Attached Storage system configured to provide 1 TB of RAID 1 (mirrored)  disk space.   This corresponds to about 120K uncompressed ccd images.

    Both wired (100 base T) and WiFi connections are available for user's laptops.  

    Data Backup

    • CD/DVD burners    Supporting both DVD+ and DVD- formats.

    • Portable Hard Drives and Data Sticks USB 2.0

    • External Interface for SATA Drives

    The appropriate media should be provided by the user for data backup.

     

    LSU