Beamline phone numbers:
+44 (0) 1235 77 8617
+44 (0) 1235 77 8713
Principal Beamline Scientist:
Nick Terrill
Tel: +44 (0) 1235 778047
E-mail: nick.terrill@diamond.ac.uk
Email: robert.rambo@diamond.ac.uk
Tel: +44 (0)1235 56 7675
Please note: these are the design specifications. Potential users should contact the I22 beamline team to discuss current capabilities.
| 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 |
For the Microfocus Option
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
|
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.
|
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.
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