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- Giacomo is doing spatial, Ryan is spectral (roughly speaking)
- both are interferometric, so the background we had in LCLS1 is mostly gone, but still have some background from stray light, for example
- goose may be the effect of the remaining background, but not sure
- Formula that should work for both: (S-B)/(S(goose)-B)B is the pedestal from dark shots.
- Giacomo will ensure that we run in a regime where (S(goose)-B) is not close to zero
- sxrx34917 (being analyzed by Giacomo and Stefan Droste). this data is "zoomed out" in the time dimension, but will be more zoomed-in for LCLS-II.
- S(goose) comes from moving the laser out of the time window, and is done "offline" according to Giacomo every few hours
- algorithm should be same for spatial/spectral
- Questions for Giacomo:
- the edge looks big in sxrx34917, do we definitely need to divide?
- does the goose contain background from stray light, for example?
- is B just pedestal, or does B include laser-pump? If it's laser-pump, do we need to use IIR to compute B?
- do we use the same B in the numerator/denominator?
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