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
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:
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.
- CD/DVD burners Supporting both DVD+ and DVD- formats.
The appropriate media should be provided by the user for data backup.