|Message: Semi-reflective surfaces||Not Logged In (login)|
Click on the Forum title, e.g. on the "Forums by Category" page, to read a sequence of postings to the Forum and its threads all in one page. If you are only interested in one thread or the thread following a specific posting, click the thread or the posting, which takes you to a smaller page, which contains only the part you are interested in and may be easier to navigate.
Messages are "chained" if there are only replies at the first level, i.e. 1/1.html, 1/1/1.html etc. In case of "chained" messages the message number is replaced by the icon and there is no indentation.
Inline: Display the subject line only or also the text of the posting(s); for the choice "All" the "Outline" choices are switched off.
|1||0||1||no text / full text of posting|
|2||1||All||text for level 1 only / text for All postings|
Outline: Choose the depth of the posting thread, successive toggle controls provide increasing detail.
|1||2||1||2 levels / 1 level (original posting)|
|2||3||2||3 levels / 2 levels|
|3||3||All||3 levels / all levels (all postings)|
Hi, I want to simulate the scintillation light produced inside a large LAr TPC, which is substantially composed of two identical volumes (filled with liquid argon) separated by a thin perforated metallic wall (the "cathode"), so that (part of) the scintillation light produced in one of the volume can also propagate in the other one (see the attached picture) and detected by an array of PMTs. From an optical point of view, the metallic wall can therefore be considered a semi-reflecting surface, with a "transparency" (the ratio between the total area of all the "holes" and the area of the wall) of about 50%. Regarding the scintillation light detection, it is not necessary to simulate the behaviour of "each" hole (with its position and size), but only a "statistical" response: a given fraction of the photons can propagate from a volume to the other one, and the remaining ones are reflected. So, my question is: how to define such a "semi-reflecting" optical surface (provided it is possible, of course) ? I found on Geant4 User documents that in the case of a dielectric_metal surface, a photon can be reflected or absorbed (in the sense that if it is not reflected, it is absorbed). The problem is further complicated by the fact that it is not possible to access or modify the source code of the simulation program, that has to be used as a "black box". The only way to define the parameters of the simulation is to provide a full gdml file with all the needed definitions (materials, geometry, etc.), that the program uses as input file. Thanks in advance, Andrea Attachment: http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2018/03/27/13.28-31041-catodo2.jpg
|Inline Depth:||Outline Depth:||Add message:|