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​What cameras are present at FACET?

Answer Collapse/Expand Text:

After discussion with various current experiments, we landed on three cameras that will be “standard” at FACET:

 1. Low-resolution camera for laser alignment: AVT Mako G-032B

 2. Medium-resolution camera for beam profile monitors: AVT Mako G-125B

 3. High-resolution camera for specialized diagnostics: AVT Mako G-507B

 We plan to have these cameras in stock at FACET so if one dies we can replace it quickly.

 Other GigE models may be present and in fact, if there is another model that becomes particularly popular, FACET will likely start to stock it.

 Users can also bring their own cameras. User groups can discuss between themselves borrowing cameras.

E.g. E-300 cameras:

ORCA-Flash4.0 CMOS Digital Camera

PCO.Edge Camera

What cameras can be integrated (are supported) at FACET?

Answer Collapse/Expand Text:

Bringing a camera into FACET and integrating it into the control system (for data acquisition) requires support from our controls group.

We have access to the LCLS controls group so we get remarkable expertise, leveraging their experience with the LCLS User Facility. Even if a particular camera has not been used at FACET before, they might have experience with it at LCLS.

If you want to bring in a camera and LCLS supports this camera, it is going to be relatively easy for us to add it to the suite at FACET.

Here are the supported camera Confluence pages for the LCLS Photon hutches:

These cameras are supported with EDT framegrabbers, but SLAC has also got its own framegrabbers and most of those models are also supported with the SLAC framegrabber.

​How do I integrate my camera into the control system at FACET?

Answer Collapse/Expand Text:

1) Check whether FACET has cameras already that you can borrow for your shift time. (See FAQ " What cameras are present at FACET?")

2) If not, check whether SLAC controls groups support a camera that meets your needs. It's relatively little effort for us to bring in a new camera to FACET if there is support already developed at SLAC. (See FAQ "What cameras can be integrated (are supported) at FACET?")

3) Finally, if you need to introduce a camera for which there is no existing support, we can engage our controls group to develop the support. It typically takes 2 weeks (full time) for an engineer to add support for a new Camlink module. If it is a new GigE camera (Allied Vision or Basler), it is usually just a few days work.

​How often do cameras die from radiation?

Answer Collapse/Expand Text:
The radiation environment at FACET has been characterized in a study here : see FAQ "How much dose is seen in the FACET tunnel"
Note that the study was with regards photon dose. The shielding does not affect neutron dose. The best method for the protection of equipment from neutrons is to put the camera outside of the accelerator housing and use mirrors. This has been done at SLAC but this is not typical at FACET.
Typically in FACET, available space precludes the use of shielding. Without shielding, our uncooled cameras (Manta GigEs)  typically last a year (~2000 hours of normal operations, located close to the beamline)  though there are particular "hot spots" where cameras will not last a week. These tend to be on the dump table and have been located both through dose measurement and trial and error. Cameras on the dump table are usually located where doses are found to be low and mirrors used as required. Cooled sensors (E-200 cameras: pco.Edge, Hamamatsu Orca) may have longer lifetimes but have also died from radiation at dump table hotspots on the ~week timescale. 
Due to the death-rate of cameras, we keep spares and design mounts such that cameras can be exchanged with minimal disruption.
Care must be taken during beamtime not to cause abnormal conditions that lead to camera damage particularly as cameras for multiple experiments tend to be installed at the same time. Abnormal beam loss can therefore affect other groups. It is important to be aware of the beam orbit. One case where the beam was not on the nominal orbit to the dump, a significant number of  cameras on the dump table died in a single shift.

SLAC SLAC National Accelerator Laboratory, Menlo Park, CA
Operated by Stanford University for the U.S. Dept. of Energy