Canadian Macromolecular Crystallography Facility - Bending Magnet
Designed for complementary performance to the CMCF-ID beamline, the CMCF-BM (08B1) beamline is used for screening crystals, high-throughput crystallographic analysis of well-ordered crystals and other more specialized analyses. The design incorporates white beam slits (WBS), a vertical collimating mirror (VCM), a double-crystal monochromator (DCM) / double-multilayer monochromator (DMM), and a toroidal focusing mirror. The endstation includes a versatile ACCEL MD2 microdiffractometer and Pilatus3 S 6M X-ray detector. Like on the 08ID-1 beamline, data collection is controlled through MxDC.
The CMCF-BM bending magnet produces a lower photon flux than the CMCF-ID insertion device in the DCM mode, which means that exposure times are typically longer than on CMCF-ID. The recent incorporation of a double-multilayer monochromator allows high-flux at fixed energy (8.157 keV), the flux in this mode being comparable to that of the current insertion device beamline setup. More information about the upgrade project is available here.
CMCF-BM is additionally equipped with Vortex ME4 & Röntec XFlash 1001 detectors to perform X-ray spectroscopy for MAD/SAD experiments, metal identification, X-ray Absorption Near Edge Structure (XANES) and Extended X-ray Absorption Fine Structure (EXAFS) analyses on crystals. A SAM automounter allows for remote experiments. The goniometer is equipped with a mini-kappa device. An HC1 humidity control device is also available for use on the beamline.
Schematic
| Component | Distance from Source |
|---|---|
| WBS (White Beam Slits) | 11.5 m |
| Mirror M1 (Vertical Collimating) | 13.0 m |
| DCM (Double Crystal Monochromator) | 17.1 m |
| Mirror M2 (Toroidal) | 19.1 m |
| Sample | 28.6 m |
Beamline Specifications
| Typical Ring Current | 150-220 mA (present maximum after injection) |
| Typical Beam Lifetime | 20 hr; injections every 8 hr |
| Bend Radius | 7.14287 m |
|---|---|
| Horizontal fan available | 6 mrad |
Beamline Hardware
| Mirrors |
Collimating Mirror with two stripes (Si, Rh/Pt) Toroidal Focusing Mirror (Rh/Pt) |
|---|---|
| Horizontal Demagnification (1/Mx) | 2.01(19.1:9.5) |
| Vertical Demagnification (1/My) | 1.37(13:9.5) |
| Crystal Type | Si(111) |
| Monochromator | KOHZU double crystal monochromator (DCM), featuring indirectly water-cooled first crystal and flat, long second crystal |
| Additional Instrumentation |
Bruker Xflash, Vortex ME4 HC1 humidity control device |
|---|---|
| Pin Length | 18 mm Hampton Cryopin |
| Cryo Capability | Oxford Instruments Cryojet / Cryojet 5 (85 - 500K) |
| Automounter | Stanford Automated Mounting system (SAM) with Unipucks, SSRL cassettes |
| Goniometer Model | Integrated in MD2 microdiffractometer |
|---|---|
| Maximum Rotation Speed (Deg/s) | 120 |
| Positioning Error (mDeg) | 2 |
| Sphere of Confusion (microns) | 2 |
| Type | On-Axis Visualization (OAV) |
|---|---|
| Orientation | Along beam axis |
| Maximum zoom | 12x |
| Maximum Field of View | 1.8 x 1.5 mm |
| Minimum Field of View | 0.18 x 0.12 mm |
| Crystal-Detector Distance | 115-700 mm |
|---|---|
| Current Detector Model | Pilatus3 S 6M |
| Framing Rate | 25 Hz |
| X-ray Sensitive Surface | 423.6 x 434.6 mm (184,097 mm²) |
| Head Dimensions (H x W x D) | 59.0 x 60.3 x 45.5 cm |
| 2Θ Range | 20° - not currently in use |
| Resolution | 2463 x 2527 |
| Detector History |
June 2020 - Present: Pilatus3 S 6M August 25, 2015 - May 2020: Rayonix MX300HE July 22, 2015 - August 20, 2015: Rayonix MX225 Before July 22, 2015: Rayonix MX300HE |