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Electron-Photon showers in CORSIKA 8
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Description
# Minutes of the EM Shower meeting 01.04.2021
### PROPOSAL installation in CORSIKA (Jean-Marco)
In the current CORSIKA master, the PROPOSAL branch `restructure_parametrization` is used, which has the known interpolation issues.
The development for the new interpolation methods using the [CubicInterpolation library](https://github.com/MaxSac/cubic_interpolation) is in a branch called `restructure_restructure_parametrization`, which will get merged into the master and released in the next days.
This new PROPOSAL can be installed classically as a cmake project and then get included with find_package() but can now also be used with the package manager conan.
Since this is still in the aforementioned branch, the three commands shown in the uploaded markdown need to be executed before installing CORSIKA (the branch `proposal_new_installation_and_bugfixes`).
The CORSIKA installation without the initial PROPOSAL commands will work when the conan-center has approved and uploaded the PROPOSAL project. For the CubicInterpolation library, which is also a conan project, it took a couple of days to get published.
### EM Showers using the updated PROPOSAL (Maxi)
Now with the updated PROPOSAL version fixing the interpolation issues em shower has been produced (it's a good practice to write the commit hash in the plot to know which version has been used ;) with a particle cut of 10 GeV, 10 MeV, and 5 MeV.
The longitudinal profile and the charge excess along the shower axis have been shown.
For these lower cuts, a charge excess gets visible and even between the 5MeV and the 10 MeV cut, a small difference in the charge excess is observed.
(Ralf requests shower plots showing the transversal and lateral distribution)
Next to the particle cut, PROPOSAL offers the opportunity to set a cut on the energy losses, distinguishing between continuous and stochastic losses.
However, in the current interface, this energy loss cut is set to half of the particle cut. This should get adapted in the future, so CORSIKA gets full control over these cuts and sets them independently.
Regarding the photonuclear interactions, PROPOSAL can calculate the energy loss for charge leptons, but no photohadronic loss of high energy photons. Since PROPOSAL cannot produce secondary particles out of it, a pseudo-particle like PhotonuclearLossPROPOSAL is discussed, which CORSIKA then can handle and produce secondary particles using e.g. QGSJet.
The relevant literature for em propagation should be collected in the [wiki](https://gitlab.ikp.kit.edu/AirShowerPhysics/corsika/-/wikis/Physics_EG) as well as not publicly available [theses](https://gitlab.ikp.kit.edu/AirShowerPhysics/corsika/-/wikis/CORSIKA-Theses)
Regarding PROPOSAL, there are only two older papers just explaining leptonic propagation, mainly muons, and taus. A new paper describing the em shower propagation with electrons, positrons, and high energy photons has not started but decided to get written.
However, there is a small summary proceeding from the ICPPA last year and the Master thesis of Jean-Marco, now uploaded in the CORSIKA wiki. Maxi's Master thesis will follow in a few weeks after he will hand it in. In these two theses, the main information about the PROPOSAL enhancements is described.
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