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Forum: Processes Involving Optical Photons
Re: None Problem with WLS fiber (Nathan Murtha)
Re: Feedback Re: Problem with WLS fiber (Michael H. Kelsey)
Re: Question Re: Problem with WLS fiber (Nathan Murtha)
Re: Warning Re: Problem with WLS fiber (Michael H. Kelsey)
Re: Question Re: Problem with WLS fiber (Nathan Murtha)
Date: 21 Aug, 2014
From: Michael H. Kelsey <Michael H. Kelsey>

On Thu, 21 Aug 2014 15:08:04 GMT, Nathan Murtha wrote: [...]
> I also made a change to the WLSABSLENGTH parameters that I assigned to
> my WLS fiber. Before, I had all the absorption lengths equal to 3.5*m.
> Now, I have any absorption length where the emission spectrum is 0.0
> (for that photon energy) set to be 0.5*mm. Is this the proper way to use
> the WLSABSLENGTH? The way I'm thinking about this is that the fiber will
> absorb all the higher energy photons, and re-emit them at a lower energy
> (thus shifting their wavelengths).

Yes, that should be okay as a temporary test. In reality, you should use the manufacturer's data for emission and absorption spectra to populate your arrays. Generally, the absorption length will be short in the incoming energy range, and long in the outgoing (WLS) range.

> [...] I can't find any reference to OpWLS in the tracking output; maybe I'm just
> looking in the wrong place?

Here's what an example looks like, with /tracking/verbose 1 set:

 *********************************************************************************************
 * G4Track Information:   Particle = opticalphoton,   Track ID = 1,   Parent ID = 0
 *********************************************************************************************

 Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
    0        0        0     -200   2.8e-06        0        0         0 WLSCladCore initStep
    1        0        0     -200   2.8e-06        0    0.432     0.432 WLSCladCore OpWLS

Note the "OpWLS" on the last step. The initial photon is killed, and a new one (Track ID = 2) is created at that point with the new wavelength.

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1 Question: Re: Problem with WLS fiber   (Nathan Murtha - 22 Aug, 2014)
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