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Topic: LUXE simulation and analysis TF
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mc sim:
- check if Sasha can submit in the grid
- follow up offline on the distribution to sites
Daniel:
- need to resolve the ellipse shape (at ~10m it would be ~300 um)
- Gianluca:
- we should mostly quantify xi with the profiler (i.e. intensity at the IP)
- “collision quality” monitoring
- the profiler will be sensitive to the number of photons more than the power (i.e. cannot infer the energy from the deposition)
- photon spectrometer should be able to measure double differential (dN/(dE*dTheta))
Ben:
- s2 - head-on can be in the ICS case, no? (what’s the impact of our angle?)
- s3: what do we actually measure form the ellipse? average xi or max xi or peak xi? —> would need to see how things come out of Tom’s simulation and how these are seen in the profiler
- LCFA will have around 10% uncertainty at xi =~2-3
- s5: do we have a cutoff to the energy deposition in the profiler? —> the energy deposited can be very small - what’s the scale of the low-E tail in the plots?
- LMA is slow to simulate
- Gianluca:
- xi<1 can be done with a simple model (dipole etc…)? —> we can use the profiler there. In principle we can do perturbative calculation there.
- Daniel:
- what would be the impact of the collision angle? —> TBD
- we have a problem with prediction uncertainty between xi=1 and xi=~2
Tom:
- Gianluca:
- proposal is good
- need to talk offline with Gianluca, Marco and Sasha to see which points we need to simulated with G4 for the profiler tests.
- we should also fold in the impact of the converter and the air before the profiler
- we need to look at the photon 2D distribution before the converter, before the exit of the beampipe and just before the profiler
Gianluca:
- will be used also in the g+laser
- Daniel:
- if we have the profiler measurement, the photon spectrum and the electron beam divergence, can we estimate the actual xi? --> probably yes but more work is needed
- what do you actually measure here? (peak xi, average xi, max xi,....)? --> not clear at the moment