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v3.3.5
Intro:
- what do we beam by noise? noise coming from the machine upstream (beam halo, secondaries,… secondary particles accompanying the primary beam)
- beampipe material is copper but we can use whatever we like inside LUXE range (Sasha uses Aluminium)
- Kapton and radiation hardness? (huge photon flux) this is used in similar fluxes in different
- technologies for the fwd spectrometer could be also Cherenkov
Kyle:
- please move to use proper spectrum of the photons (need to see how to implement the fixation)
- backscattering from the collimators —> will be difficult for the IP detectors —> need more distance.
- liso scintillators will be used in SLAC (fast scintillation time) —> please send around documentation
- need to discuss redundancies for the technologies
- distance from dipole to the detector is too large for the particles to travel in air
- use vacuum all the way with slots? too expensive and a lot of scattering in the slot-window
- put wires in vacuum is possible (down to the 1 mu scale and even below) but we anyhow need a window at the end of the vacuum
- can work on the 2 solutions
Tony:
- go with 17.2 deg
- Sasha: need to reproduce the bremsstrahlung file again.
- do we assume foil is in vacuum?
- timing misalignment also implemented?
- intensity scan:
- simulate additional ~4 points of lower intensity besides the “best” one for each laser
- can increase the spot size or the pulse length to play with the intensity rather than playing with the power itself
- in the gamma+laser setup we can gain a lot by using a larger spot since the Bremss’ photons flux will be bigger than the electron beam.
- misalignments:
- jitter from XFEL is ~8 fs, but the error would be much larger (driven by the laser jitter)
- for every point simulated, we’d need another run(s) with “±1sigma” misalignments implemented.
- in the beginning we can do this only for the “best”
- can launch jobs by early next week
Sasha:
- B-field ?
- change distance between the staves from 5.4 to 10 cm (also the overlap is not 7 cm but 4 cm) —> Noam will ask Oz to change that in the drawings
- fwd spectrometer:
- should use the Cherenkov there for now
- add the collimators after the end of the pipe (200 um thick window made of Kapton)
- move setup as much as possible “to the left” but with minimum interference with the IP detectors
- will optimise the processing time (increasing step sizes etc). Now it’d be impossible to simulate ~1e10 electrons (now: 3h per 100k particles on one machine)
- can distribute jobs between the institutions (DESY, UCL, WIS,…) but need a setup which can work out of the box.
- can launch jobs by early next week