BioXAS-Main

BioXAS-Spectroscopy-Main beamline is optimized for the high-sensitivity X-ray detection on low concentrated samples.

Schematic

More details about the beamline schematic can be found at Ray Tracing Performance.

The image shows the optical design and X-ray tracing simulation of the beamline.

From left to right, the beamline has:

A wiggler as the source of x-ray.
A fixed mask to let a fraction of the wiggler output reach the beamline optics.
A first collimating toroidal mirror M1. It collimates the beam vertically and focuses it horizontally.
A double crystal monochromator with Si 220 crystal set.
A second, focusing, mirror M2.
A set of Double-Bounce Harmonic Rejection Mirrors (used for some energies, and not shown in the figure).
A set of vertical and horizontal slits in front of the sample.
The sample plane, where the sample is illuminated by the beam.

The detectors, which are not shown in the picture, are detailed in section (link when available)

Optics
M₁ Mirror	M1 mirror: Toroidal, 1 m, Si, Rh-coated, Sagittal radius: 33 mm. Water-cooled.
Monochromator	Monochromator: LN2 cooled, Si(220), ϕ = 0ᵒ & 90ᵒ, double-crystal, non-fixed exit slit (see mono glitch database)
M₂ Mirror	Flat Bent, vertically focusing, 1.1 m. Si, Rh-coated
	For energies below 10 keV, double-bounce harmonics-rejection mirrors (C-coated Si)

Instrumentation
Detectors	Ionization chambers, PIPS, Canberra 2 x 32-element HPGe solid-state
Cryostat	Oxford Helium cryostat, cooled by liquid He Dewar (min. temp 10 K), or liquid Nitrogen Dewar (min. temp 80 k).
Other	Shutter and beam-attenuation filters to alleviate beam damage. Soller slits and fluorescence filters to limit scatter radiation in fluorescence mode.

Data Acquisition

GUI based Data Acquisition Manager Software (AcquaMan) and Python Based

Automation Package (cls_bxs_control)

Automatic scan queuing available for multiple samples and/or multiple spots on the same sample

Athena, Larch and Viper for data analysis