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Beamline X4A

General Information

Source Type
Bending Magnet

Status
Operational

General User Beamtime
25%

Energy Range
3.5-20 keV

Beamline Type
Participating Research Team (PRT)

Technique(s)
Multi wavelength anomalous diffraction
Macromolecular crystallography

Institution(s)
Albert Einstein College of Medicine
City University of New York (CUNY)
Columbia University
Cornell University
Mount Sinai School of Medicine
New York Structural Biology Center
New York University
SUNY @ Buffalo
Sloan-Kettering Institute for Cancer Research
Wadsworth Center

Research Types
Macromolecular crystallography, multiwavelength anom. diff. analysis of crystalline biological macromolecules.

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.
Wayne Hendrickson, Columbia University, wayne@convex.hhmi.columbia.edu, 212/305-3456

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.
John Schwanof, New York Structural Biology Center, schwanof@bnl.gov, 631/344-5170
Randy Abramowitz, New York Structural Biology Center, randy@bnl.gov, 631-344-5464

Beamtime Scheduler The beamline staff member responsible for coordination of beamline schedule every trimester. Contact for questions about beamtime scheduling.
John Schwanof, New York Structural Biology Center, schwanof@bnl.gov, 631/344-5170

Beamline Phone
631-344-5604

Instrumentation

Beamline Characteristics

Energy Range Mono Crystal or Grating Resolution (ΔE/E) Flux Spot Size (mm) Total Angular Acceptance (mrad)
~4 – 20 keV Si(111) ~10-4   0.3H x 0.3V 1, 2, 3.5, 5

Source Type
Bending magnet

Optical System
Slits: Variable vertical and fixed horizontal slits.

Monochromator: KOHZU double crystal monochromator with a water-cooled flat first crystal and a sagittally focused second crystal positioned for a fixed exit beam condition. Located ~18 m from source and ~6 m from sample position.

Mirror: Mirror system consisting of two vertically stacked, fused silica, spherical mirrors, to provide vertical focusing and harmonic rejection. One of the mirrors is rhodium coated and the other is uncoated. Located ~19.7 m from source.

Beam Monitor System: Includes ion chambers, attenuators, slits, experimental shutter, collimator and beam stop.

Experimental Apparatus
4-circle diffractometer with ADSC Q4R CCD detector mounted on 2-theta arm; detector distance motor driven through beamline control program. Fluorescence detector and sample alignment camera mounted on diffractometer. Sample cooled with an Oxford Instruments “Cryostream”.

Computer System Hardware & Software
The beamline is controlled using a Windows based control program. Data processing computers available are two Linux workstations, one SGI and one Alpha. Data storage capacity is over 700 GB, data backup on DVDs or convenient connection to Firewire or USB2.0 external drives.

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