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next-exp / nexus

Geant4 simulation framework of the NEXT Collaboration
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First implementation of p-terphenyl wavelength shifter #185

Closed soleti closed 2 years ago

soleti commented 2 years ago

P-terphenyl is an organic compound which can be used to shift Xe light into the near UV. Coupled to UV-to-blue fibers (such as B2 from Kuraray), it may provide a higher light collection efficiency than the usual blue-to-green fibers + TPB. This PR includes a first implementation of this material. The literature doesn't provide the WLS absorption length as a function of the wavelength, so we make an estimate based on the absorption spectrum provided in https://iopscience.iop.org/article/10.1088/1748-0221/5/04/P04007.

soleti commented 2 years ago

Now that I look, there was already a p-terphenyl material stub, but it was called TPH. Let me fix this...

paolafer commented 2 years ago

Ok, I understand then that TPH is a specific type of p-terphenyl?

soleti commented 2 years ago

Not that I am aware of? The materials list states G4String name = "TPH"; // p - terphenyl

paolafer commented 2 years ago

Not that I am aware how? The materials list states G4String name = "TPH"; // p - terphenyl

Ok, it's just an abbreviation of terphenyl, then :-).

jmalbos commented 2 years ago

Some publications refer to p-terphenyl as TPH. The function @soleti mentions comes from the early days of NEXT, where we explored the use of several WLS. You can remove it or call the new function from within, if we want to keep both names.

paolafer commented 2 years ago

I think it's better to keep just one name, as it is in the current version proposed by @soleti, it's simpler and avoids confusion.