BEAMLINE X3B

NSLS and Beamline X3B ceased operations on September 30, 2014. Stay tuned for XAS@NSLS-II.

General Information

Contacts

Capabilities

Energy Range
(keV)
Crystal Type Bandwidth Flux (photons / sec) Size of Focus
(mm)
3.8 . 13.3 keV (Si 111) Sagitally focused Si(111) with an option of flat Si(220) 3eV @ E = 10 keV 9 x 10^11 (10 keV, I = 235 mA) 0.7 H x 0.2 V

3 mm vertical and 50 mm horizontal beam aperture in hutch. Horizontal width up to 100 mm possible.

Optical and Beamline Configuration

The beamline optical transport system operates under high vacuum and is enclosed by two Be windows. One 0.010. thick Be window is located in the front end 8.6 m from the source, while a second 0.008. Be exit window is located in the hutch 20 m from the souce. A primary aperture assembly located 11.2 m from source provides pre-monochromator beam-defining slits.

A double crystal monochromator with fixed exit geometry is located 16.5 m from the source, with water cooling for the first crystal. The Bragg angle range is 8.5-35 degrees with a sagitally focusing Si(111) second crystal (magnification 0.23-0.40) available as standard equipment. If requested in advance, flat Si(111) and Si(220) crystals, each 100 mm wide, can be operated side-by-side. A nickel-coated cylindrically bent mirror located 18.1 m from the source is available for harmonic rejection and vertical focusing (0.3 mm FWHM, magnification 0.13-0.29). Mirror angle and focal length can chosen independently for variable beam size on the sample.

Experimental Apparatus

A 4m x 3m radiation hutch is located 20 meters from the source, with a computer controlled X-Y aperture and X-Y-Z translation stage with additional pitch and roll capability (2000 lbs load capacity) available as standard equipment. Detection capabilities are provided by four transmission ion chambers with electronics (amplifiers, V/F converters, scalers) and a Canberra 31 element Germanium fluorescence detector with XIA DXP-xMAP digital multichannel analyzer electronics. A Helium Displex cryostat attached to a vacuum chamber (14 K sample temperature) is standard for low temperature experiments. A laser alignment system and 9 plate, 180 well high-throughput metal screening apparatus are also available on request. Other user-provided experimental apparatus can be readily accommodated on the X-Y-Z translation stage.

Computer System Hardware and Software

Beamline control and data acquisition is provided by two PCs running Windows 8. One PC runs the NSLS XDAC Data Acquisition Software with CAMAC interface, while the second PC controls the 31 element Ge detector using XIA's xManager software and an EPICS-based dxp-xMAP client. A third Windows 8 PC is available for data processing and analysis; the EXAFS data processing programs Athena, Artemis, and Six Pack are available. DVD/RW drives and ethernet connections are present on all machines for data transfer. HP LaserJet 4050N and LaserJet P1102w printers are also available.