Beamline
Detailed Specifications and Capabilities
A major feature of X17 DAC is the high brightness associated with the wiggler source of this second generation synchrotron – a feature that is extremely important for diamond cell experiments in which sample volume (and hence diffraction intensity) is normally the key experimental limitation. The wiggler has a high superconductor magnetic field (5 Tesla) that produces a spectral profile similar to bending magnet (BM) beamlines at the Advanced Photon Source (APS), but has the additional advantage of multiple (5) poles and higher current that in principle yield about 5-10 times higher brightness and brilliance than the APS BM. Actual values achieved in practice depend on various beamline factors (e.g. distance from source, monochromators, focusing optics).
Super Conducting Wiggler:
4.2 T,
13.3 mrad fan,
22 keV critical energy
Beam Lines:
5 mrad (X17B1, B2 & B3) shared
& 2.15 mrad X17C
Superconducting Wiggler at the NSLS: Systems Description and Initial Experience
(Decker, NIM, 1990)
The X17C beamline is a side station that runs 100% of the time. The
X17C system includes a θ-2θ goniometer with a large detector arm, an
optional χ-circle for single-crystal diffraction studies, and an
intrinsic Ge detector. A table-top Kirkpatrick-Baez mirror system
provides a doubly focused beam. A sagitally bent double crystal Laue
monochromator was developed for the X17C hutch in collaboration with
NSLS staff. The monochromator can provide 20-40 keV x-rays.
Monochromatic angle dispersive x-ray diffraction (ADXD) experiments at
23, 25, and 30 keV energies are currently in operation, in addition to
traditional energy dispersive mode.
X17B3
X17B3 beamline is available for energy dispersive and monochromatic experiments. A double-sided laser heating system with a fiber laser is in final development stages. The X17B3 beamline runs 33% of the time in dedicated mode with an additional 33% available in parasitic mode when the X17B2 (multi-anvil) station is running. A two-circle goniometer is set up in X17B3. A Kirkpatrick-Baez mirror system can currently produce a double-focused beam of ~10 x 20 μm in size.
The sagitally bent Si Laue crystal monochromator can provide monochromatic beams of 30 keV and 80 KeV. Available detectors are a Mar345 image plate detector and a Perkin Elmer flat panel detector.
Examples of Current Beamline Setups
(click on image for larger version)
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