Beamline Layout and Technical Specification

 

 

 

Energy range	7 - 20 keV
Energy resolution (Δ E/E)	1.66 x 10-4 with Si (111)
Energy stability	± 0.125 eV
D-spacing range	1 - 5000 Å (Main Beam) 1-1000Å for microfocus
Photon beamsize at sample	240 (H) x 60 (V) µm, varies with camera length and focus point With micro-focussing: From 50 x 50 to 10 (H) x 10 (V) µm
Beam divergence at 12 keV	80 (H) x 50 (V) µrad With micro-focussing: 0.6 x 0.7 mrad

 

 

 

 

Insertion device	In-vacuum U25 undulator
Nominal magnet length	2m
Nominal magnet gap	5-8mm
Magnet period	25mm
Aperture	150 µrad x 75 µrad

• Photon shutter

• Primary Slits

• Double crystal monochromator Si (111)

• Kirkpatrick-Baez Mirrors (Bimorph type)

• Defining Slits

• Secondary Slits

• Diagnostic

For the Microfocus Option

• Secondary Source

 

• Be CRLs in Fswitch

 

 

This section contains info on the I22 Sample area and the services available to the User in that Area.

In order to accommodate a wide variety of sample environments, including all the I22 sample environments and user supplied sample cells and systems, the experiment area has been designed to be very flexible and can be adapted to suit each new configuration. Please talk to a beamline scientist well in advance of your experiment if you are planning to bring your own sample environment to ensure that it will fit.

The beamline was designed to accommodate a sample environment that fits into a 300mm x 300mm x 300mm box in its standard configuration. We may be able to accommodate sample environments up to a 500mm x 500mm x 500mm box if thay can be designed to avoid a clash with the nosecone.

To minimise the disruption to your beamtime and ensure that your sample environment will work on I22, please consult us when designing your sample environments. Please note that all SAXS beamlines are arranged differently so equipment that was designed to work elsewhere may need to be adapted before use on I22.

The experimental hutch is equipped with several sample environments. A micro-focusing option is also available accessing beam sizes ~10µm.

Flux at 12.4keV on sample (ph/s):	3.5 x 1012 in 250 x 80 µm 0.1% @ 300mA
Sample distance from source:	47.35 m
Sample Volume:	Maximum 300 x 300 x 300 mm

 

The Pilatus P3-2M from Dectris is the default SAXS detector at I22

Technical specifications

Number of modules	8 x 3 = 24
Sensor type	Reverse-biased silicon diode array
Sensor thickness	450 μm
Quantum efficiency	5.4 keV: 93.9% 8.0 keV: 97.9% 17.5 keV: 47.5%
Pixel size	172 x 172 μm2
Module size	83.8 x 33.5 mm2
Format	1475 x 1679 = 2,476,525 pixels
Area	253.7 x 288.8 = 73,265.5 mm2
Intermodule gap	x: 7 pixels, y: 17 pixels, 8.0% of total area
Dynamic range	20 Bits = 1’048’573
Counter overflow state	1,048,573
Counting rate per pixel	1x107 X-ray/sec (incoming X-rays)
Energy range	5 – 36 keV
Energy resolution	500 eV
Adjustable threshold range	2.7 - 18 keV
Threshold dispersion	50 eV
Readout time	0.95 ms
Framing rate*	250 Hz
Point-spread function	1 pixel
Data formats	Raw data, TIF, EDF, CBF
External trigger/gate	3.3 - 5V, 3 different modes

 

 

* While Pilatus is capable of collecting significantly shorter exposures there is a limitation of 250Hz for collecting consecutive frames.

The Pilatus3-2M-DLS-L is a custom in-vacuum WAXS detector made for I22 by Dectris. It comprises 21 Pilatus3 modules arranged in the familiar 3 x 8 style of the Pilatus3-2M but with the 3 modules of the bottom right corner missing to allow for transmission of SAXS data through the detector.

 

Technical specifications:

Number of modules	(5 x 3) + (3 x 2) = 21
Sensor type	Reverse-biased silicon diode array
Sensor thickness	450 μm
Pixel size	172 x 172 μm2
Module size	83.8 x 33.5 mm2
Format	Standard 2M: 1475 x 1679 = 2,476,525 pixels Removed area: -494 x 636 = 314,184 pixels Total: 2,162,341 pixels*
Area	Standard 2M: 253.7 x 288.8 = 73,265.5 mm2 Removed area: -85.0 x 109.4 = 9,294.8 mm2 Total:63,970.7 mm2*
Intermodule gap	x: 7 pixels, y: 17 pixels, 7.8% of total area
Dynamic range	20 Bits = 1’048’573
Counter overflow state	1,048,573
Counting rate per pixel	1x107 X-ray/sec (incoming X-rays)
Energy range	5 – 36 keV
Energy resolution	500 eV
Adjustable threshold range	2.7 - 18 keV
Threshold dispersion	50 eV
Readout time	0.95 ms
Framing rate	250 Hz
Point-spread function	1 pixel
Data formats	Raw data, TIF, EDF, CBF
External trigger/gate	3.3 - 5V, 3 different modes

 

*The WAXS nosecone in transmission SAXS geometry can shadow the WAXS detector if the sample is too far from the window.