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FACET CAPABILITIES: ​​What is the energy spread of the FACET beam?

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​​What is the energy spread of the FACET beam?


​​​What is the energy spread of the FACET beam?


Experimentally it has been ~0.8% uncompressed to ~1.4% fully compressed (RMS), full width ~4% compressed with a complicated looking distribution. We measure the energy spread with the "sYAG":

The simulation expectation for the 7mm R56 chicane optics are ~1% RMS fully compressed with <2% full width.

Follow up question: What would be the ratio of correlated energy spread to uncorrelated? 
It depends on the compression, fully compressed there should be none of course, but we leave in some for 2-bunch operations.


Version: 2.0
Created at 2/3/2014 10:42 AM by Clarke, Christine
Last modified at 2/3/2014 10:44 AM by Clarke, Christine

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