|Message: Re: Cerenkov + Scintillation (+ OpticalPhoton)||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)|
AddProperty (in G4MaterialPropertiesTable.cc#129) instantiates a G4MaterialPropertyVector(PhotonMomenta,PropertyValues,NumEntries). The 'vector' has to have at least 2 entries. The implementation is more general than the case whereby a scintillator has zero line width emission lines. You can specify a whole continuous spectrum over a range of photon momenta. For practical purpuses this should not be a problem for you as you can make the emission line as narrow as you like.
NumEntries is not the number of emission lines, but rather the number of spectral points you specify. No line width is ever infinitesimal narrow anyway. So, for example, if you have narrow emission lines (with equal intensity, one at 10eV and another at 11eV, you could specify the following array pair:
( 9.999eV,0.0) (10 eV,1.0) (10.001eV,0.0) (10.999eV,0.0) (11 eV,1.0) (11.001eV,0.0)
i.e. you approximate your emission spectrum with narrow saw tooth lines. G4 does a numerical integration over this array and then samples the photon momentum in the usual way [see G4Scintillation::BuildThePhysicsTable() and the "Determine photon momentum" part of G4Scintillation:PostStepDoIt]
SetResolutionScale method has nothing to do with the optical photon momentum spectrum. It rather specifies the intensity smearing for a given energy loss in the scintillator; i.e. the number of photons generated.
G4int NumPhotons = (G4int) MeanNumPhotons + int( ResolutionScale * G4RandGauss::shoot(0.0,sqrt(MeanNumPhotons)));
It is the 'extra' smearing which multiplies the statistical one in NumPhotons.
|Inline Depth:||Outline Depth:||Add message:|