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.

Source

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

• 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)

Computers and Software

The beamline has computers running Linux (Red Hat and Fedora) with the following crystallographic software:

• CCP4
• HKL-2000
• CNS
• Solve/Resolve
• Xtalview
• O

The beamline also has a PC running Windows XP.  We also provide internet connectivity if you desire to bring a personal laptop to the beamline.

Data Backup

The beamline provides support for backing up your data onsite in the following formats

• CD and DVD burners

Supporting both DVD+ and DVD- formats

• Portable Hard Drives using Firewire (IEEE1394) or USB

Our computers currently only have USB1.1, so Firewire currently offers the fastest transfer rate.

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