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Beamline X3A

General Information

Source Type
Bending Magnet

Status
Operational

General User Beamtime
25%

Energy Range Category
Hard X-Ray (1-50 keV)

Energy Range
4.6-15.1 keV

Beamline Type
Participating Research Team (PRT)

Technique(s)
Multi wavelength anomalous diffraction
Macromolecular crystallography

Institution(s)
Case Western Reserve University
Rockefeller University
Sloan-Kettering Institute for Cancer Research

Research Types
Macromolecular protein 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.
Mark Chance, Case Western Reserve University, mark.chance@case.edu, 216-368-4406

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.
Wuxian Shi, Case Western Reserve University, wushi@bnl.gov, 6313442099
John Toomey, Case Western Reserve University, jtoomey@bnl.gov, 631-344-7057

Beamtime Scheduler The beamline staff member responsible for coordination of beamline schedule every trimester. Contact for questions about beamtime scheduling.
Wuxian Shi, Case Western Reserve University, wushi@bnl.gov, 6313442099

Beamline Phone
631-344-5787

Instrumentation

Beamline Characteristics

Energy Range Mono Crystal or Grating Resolution (ΔE/E) Flux Spot Size (mm) Total Angular Acceptance (mrad)
4.6 - 15.1 keV Sagitally focused Si(111) with an option of Si(220) 3 eV at E = 10keV 3.8 x 1010 photons/sec at E=12.6 keV, I = 300 mA through 0.2 x 0.2 aperture 0.7 H x 0.2 V (variable) 15 mrads; 4 mrads currently used

Source Type
Bending magnet

Optical System
Be Windows: front end: 0.010" thick; 7.0 m from source exit window: 0.020" thick.

Primary Aperture: 7.5 m from source.

Monochromator: Double crystal monochromator with fixed exit geometry; Bragg angle range is 7.55 degrees - 28 degrees; sagitally focusing Si(111) crystals, high precision rotary energy scale; operates in high vacuum; located 9.6 meters from the source.

Mirror: For harmonics rejection and vertical focusing (0.08 mm FWHM); flat cylindrically bent mirror; independent choice of mirror angle and focal length; located 11.2 meters from the source.

Experimental Apparatus
Radiation hutch located 13 meters from the source; 3 meters long and approximately 2.5 meters wide. MAR 165mm CCD Detector. Oxford cryojet. Computer controlled X-Y aperture and X-Y translation stage (125 lbs. load capacity). Two transmission ion chambers with electronics (amplifiers, V/F converters, scalers).

Computer System Hardware & Software
Beamline control and data acquisition: Pentium III 1GHz computer running Windows XP; NSLS Data Acquisition Software with CAMAC interface; 3.5" floppy drive, 250 MB Zip Drive, CD/RW, ethernet connection for FTP data transfer.

Beamline data analysis: Pentium III 1GHz computer running Windows XP, 3.5" floppy drive, 250 MB Zip drive, CD and DVD drive, ethernet connection for FTP data transfer.

Crystallography data acquisition, processing, and analysis: Si Graphics Octane,
2.8Ghz Dual processor running Linux red hat Enterprise WS(v.3)

Laser Jet 4050N (postcript) printer

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