The Protein Crystallography Beamline at CAMD


User Information
Beamline Schedule

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 200 mA and 2 fills per day.

The GCPCC beamline utilizes 1.5 mrad of the output of a single-pole 7 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.



  • Ring energy: 1.3 GeV
  • Ring current (at injection): 200 mA - 2 fills per day
  • Insertion Device: 7 T superconducting, single-pole wiggler


  • 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):


  • Sample positioning: Mar Research dtb single-axis goniostat

Chi motion for crystal mounting

  • Sample to detector distance: 50 - 380 mm
  • Detector theta: 0° - 30°
  • Sample temperature control: Oxford Instruments CryoJet (100 K - room temperature)
  • Detector: Mar165 CCD detector
  • Fluorescence detectors: Oxford Cyberstar, Eurisys

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 (Fedora) with the following crystallographic software:

  • CCP4
  • HKL-2000
  • Phenix

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

The beamline also has a PC running Windows XP.

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   Firewire (IEEE1394) or USB 2.0

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