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X12c External Homepage

Beamline X12c

General Information

Source Type
Bending Magnet

Status
Operational

General User Beamtime
65%

Energy Range
5.5-20.0 keV

Beamline Type
Participating Research Team (PRT)

Technique(s)
Multi wavelength anomalous diffraction
Macromolecular crystallography

Institution(s)
Brookhaven National Laboratory, Biology Dept.

Research Types
Macromolecular crystallography, multi-wavelength anomalous dispersion (MAD), software for high-throughput crystallography.

Contact Information

Spokesperson The person from each beamline who acts as a contact point between the beamline management and NSLS administration. Contact for questions about the beamline scientific program, experimental capabilities, and beamline management.
Robert Sweet, Brookhaven National Laboratory, rsweet@bnl.gov, 344-3401

Local Contact The beamline staff member who is typically responsible for overseeing the daily operation and maintenance of the beamline. Contact for questions about beamline instrumentation, experimental details, and training.
Anand Saxena, Brookhaven National Laboratory, asaxena@bnl.gov, 344-4844

Beamtime Scheduler The beamline staff member responsible for coordination of beamline schedule every trimester. Contact for questions about beamtime scheduling.
Alexei Soares, Brookhaven National Laboratory, soares@bnl.gov, 344-7306

Beamline Phone
631-344-5642

Instrumentation

Beamline Characteristics

Energy Range Mono Crystal or Grating Resolution (ΔE/E) Flux Spot Size (mm) Total Angular Acceptance (mrad)
5 – 20 keV Si(111) 8 x 10-4 ~2 x 1010 ph/sec 0.1 – 0.5 mm diam. variable to 2

Source Type
Bending magnet

Optical System
The X12C beamline optics consist of a vertically collimating mirror (that is shared with X12B) followed by a channel-cut Si(111) crystal monochromator and a doubly focusing toroidal mirror.

Experimental Apparatus
The X12C endstation contains a four-circle Enraf-Nonius kappa geometry diffractometer, a four-cell CCD x-ray area detector which was built at Brandeis University, and an Oxford Cryosystems 600 series cryostream system for sample freezing. The diffractometer and detector will be replaced in the near future by modern commercial versions.

Computer System Hardware & Software
Networked array of Linux PCs. CBASS data collection software, HKL2000 data analysis software.

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