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The incident photon energy is preferred to be 9.5 keV but justified deviations can be considered. The x-ray focus can vary over a range of ~2-3 µm to ~100 µm.
Measurements at cryo-cooled temperatures or room temperature will be possible.
The setup includes the option of an on-axis cryo-cooler to maintain crystals at temperatures of 278 to 100K during the measurements. An Arinax humidity control instrument is available for controlled humidity (30.0 % to 99.8 % RH) during measurements at ambient temperatures.
A sample exchange robot, the Stanford Automated Mounting (SAM) system, may be used to exchange samples on compatible magnetic bases held in SSRL cassettes or uni-pucks from inside an LN2 liquid nitrogen filled storage Dewar: http://smb.slac.stanford.edu/users_guide/manual/Using_SSRL_Automated_Mounti.html. Samples at ambient temperatures may be mounted from 10 sample base storage locations on the side of the SAM robot.
More detailed information on what is supported by the standard SMB suite of capabilities for sample mounting, data collection modes, etc. can be found here. Please contact SMB support staff prior to the experiment for specific information on sample compatibility and size restrictions, borrowing SAM compatible cryotools and sample holders, or the availability of custom automation in sample centering and positioning. For users new to the SAM robot, a kit of supplies for using the SAM robot for sample exchange with cryogenically cooled samples may be lent to your group prior to the experiment (to be returned after the experiment).
LCLS proposals are submitted through the User Portal.
With this standard configuration, MFX will be able to support jet-based Serial Femtosecond Crystallography (SFX) experiments at atmospheric pressure and temperature with noise minimization from the Helium environment. This will be possible with or without a pump laser. Also supported will be Small Angle and Wide Angle X-ray Scattering (SAXS/WAXS) with or without a pump laser using the wide variety of sample delivery jets, either LCLS-owned or supplied by the user groups. The detector will be a Rayonix 170 capable of 10 Hz operation with 1920x1920 pixels.
An Opolette HR 355 will be available for <8 ns pump laser pulses over a wide tunability range (410-2200 nm). This laser will be fiber-coupled then propagated in free-space into the sample chamber and combined collinearly with the x-ray, with in-coupling ~250 mm upstream of the sample and with the focusing lens ~350mm away from the sample. Note that the efficiency of the optics and the performance of the laser will not be the same for the entire wavelength range. The maximum achievable power density will be determined by the existing optical system and will not be modified. Contact the MFX scientists to discuss specific needs and determine if they can be achieved using this standard configuration of the laser. The expected performance at the source is shown below (the energy on target will be substantially lower due to transport losses). The MFX system will have the following options:
SLAC National Accelerator Laboratory, Menlo Park, CA
Operated by Stanford University for the U.S. Dept. of Energy