|Message: Re: Confusion on simulating a foil wrapping||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)|
> I've read that using 'groundbackpainted' always results in lambertian > reflection from the wrap.
Yes, this is correct. Also, note that the 'groundbackpainted' finish applies only the 'dielectric_dielectric' surface types.
> Is this the case even with a dielectric-metal interface?
If your surface type is 'dielectric_metal' then there is no implied narrow dielectric layer between your scintillator and the metal reflector.
> Is it possible wrap a volume in a specular reflector?
Yes, but you must specify the thin air layer as a separate dielectric volume space in G4. What you have then is a dielectric_dielectic surface between the lead glass block and the air gap, and a second surface 'dielectric_metal' between the air gap and the Al wrap. The finish of the second surface can be perfectly polished resulting in a specular reflector.
As an aside, at the moment, the unified model's list of options: SpikeReflection, LobeReflection, BackScattering and LambertianReflection, in the case of 'groundbackpainted' refer to the interface of the scintillator with the implied dielectric (air) gap. The reflection of the wrapping is always lambertian. As things are coded, it is not possible to specify these choices for both this interface and for the wrapping. Allowing both choices can be considered for a future extended functionality.
|Inline Depth:||Outline Depth:||Add message:|