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New members:
- Christian Roedel (Jena) was welcomed to the group. He will be working with Andi along with Matt Zepf (Jena) and Ulrich Schramm (Dresden) who both could not attend this time.
- Noam Hod (Weizmann) was welcomed to the group. He is putting together a detector lab and is interested in getting involved in the detector effort.
Florian - accelerators
- EU.XFEL will probably stay running with 0.25 nC, so use this as a standard value. Also consider 14 GeV which is the standard at the moment, but this should increase in the future.
- The new experimental area was discussed extensively
- XSDU1, originally proposed area:
- We do not want to go through a plan-approval process (Planfeststellungsverfahren) needed if beam dump is modified as this can take years.
- Reinhard commented that an effective 1 per mille beam loss may have been included in approval of the beam line? This would have to be reported anyway and could be okay (=> no new Planfeststellungsverfahren?).
- XTD20, newly proposed area:
- Several advantages: no major beam dump, building infrastructure already present, a lot of space, no photon beam line.
- Since this is upstream of undulators it could be perceived as interfering with photon science, even if only 1/2700 bunches is needed (and not all the time). And, major modifications to the beamline are needed which could take long (time scale needs to be estimated)
- In view of the installation of a 2nd XFEL fan in ~2030+ a beam line anyway needs to be constructed. LUXE would just advance the process and serve as useful testing ground => This could be an argument in favour of LUXE for photon science community.
- This beamline could also be used as a test beam line (strong desire to have one as current one in jeopardy when PETRA IV starts).
- For now both options should be explored in parallel to understand better the critical aspects (Planstellungsverfahren need for XSDU1 & beamline modification time scale+complexity for XTD20)
Andi & Christian - lasers
- It was underlined that we need a suite of redundant diagnostic systems in order to measure e.g. a0.
- The experiment was trying to measure high-field Compton scattering, but using Compton scattering to calibrate laser. Have to be careful that there is independence in the measurements and it is not a circular process.
- Look at the calculation with and without strong-field formula.
Sasha - detectors
- Need to check material properties of target and beam size to see what is safe and reasonable to use.
Tony - theory
- Tony had to leave early so will discuss his work next time.
Next meeting 29 November at 10:00.