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Beamline X2B

General Information

Source Type
Bending Magnet

Status
Operational

General User Beamtime
25%

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

Energy Range
8-35 keV

Beamline Type
Participating Research Team (PRT)

Technique(s)
X-ray microtomography

Institution(s)
ExxonMobil Research and Engineering Co.

Research Types
X-ray microtomography of oil reservoir rock, polymer and catalysts.

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.
John Dunsmuir, ExxonMobil Research and Engineering Co., john.h.dunsmuir@exxonmobil.com, 908-730-2548

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.
Larry Fareria, Brookhaven National Laboratory, fareria@bnl.gov, 344-2796

Beamtime Scheduler The beamline staff member responsible for coordination of beamline schedule every trimester. Contact for questions about beamtime scheduling.
John Dunsmuir, ExxonMobil Research and Engineering Co., john.h.dunsmuir@exxonmobil.com, 908-730-2548

Beamline Phone
631-344-5602

Instrumentation

Beamline Characteristics

Energy Range Mono Crystal or Grating Resolution (ΔE/E) Flux Spot Size (mm) Total Angular Acceptance (mrad)
6.5 – 35 kev Si(111) 2 x 10-4 ~ 211 ph/sec (@ 11 keV, 70 mA, 2.5 GeV) 5H x 7V 2
White Beam White Beam White Beam      

Optical System
White beamline with flat single crystal Si(111) Bragg spectrometer in He purged enclosure inside hutch. 22 and 44A multilayer mirrors are available on request. A foil holder can also be fitted in place of the monochromator crystals for white beam operations. There is a 75 cm air path between the He purged chamber and the specimen. Motor driven slits mounted in the air path define illuminated area on specimen. A motor driven filter wheel also in the air path holds metal foil filters for energy calibration. An uncoated Zerodur flat is also available for mounting downstream from the monochromator for harmonic rejection. The beam height with the Zerodur mirror in-place is less than 1mm.

Experimental Apparatus
Absorption tomographic scanner consisting of: radiation hutch with white beam and monochromatic beam capability. X-ray imager with CsI scintillator optically coupled to 16bit 1340 x 1300 CCD sensor. Microscope objectives (2.5x, 5x, 10x, 20x) give a pixel pitch of 20 microns/x. A 2.5x projector is available where higher depth of focus is required. Automated control for monochromator and tomographic scanning. A second 12 bit CCD camera is fitted for high speed acquisition in conjunction with multilayer or foil optics. (Use of microtomography equipment is by agreement with PRT members.)

Computer System Hardware & Software
16bit absorption tomographic scanning: WindowsXP PC running an extended version of IPLab (Scanalytics) for beamline configuration, tomographic data acquisition, and tomographic reconstruction.
12Bit high-speed tomographic scanning: A Macintosh G3 running an extended version of IPLab (Scanalytics) for beamline configuration, tomographic data acquisition, and tomographic reconstruction.
Batch reconstruction: An additional WindowsXP PC for batch reconstruction using PRT software running as an ImageJ plugin.
Visualization: The second PC also runs DRISHTI (ANU) for visualization and is networked to the acquisition PC.
Backup beamline control: Dell 310 UNIX system running SPEC for monochromator, mirror and diffractometer control.

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