[Gate-users] Help with gate 6.2 optical simulation

[Marcin Balcerzyk]

Dear Leo.

 

It may be of little help, but try to enable Hits and Ascii output for them
to see the details for some small number of incident gammas, so that
simulation does not choke. If hits are there, and you can see photons in the
hits, then something is wrong in the Digitizer. I comment from my memory,
not so sure of the exact location of the output. Gate 6.x stopped having
optical photons examples, which were there in Gate 5. Try to get the optical
photons example from Gate 5. I think as is, they will not work in Gate 6.2,
but you can try to run it and port the optical photon example to Gate 6.2.
If you get them working, contribute to Gate 6.x development by suggesting
re-addition of these examples to Gate 6.x developer team in a modified form.


 

Generally I remember in Gate 5 that there is concept of surfaces/interfaces
between the crystal and PMT/APD (which stay as a passive box anyway) and
photons passing this surface, which at some time was not very clear to me -
as far as I could understand, you detect only the photons passing the
interface, all else are trapped in your crystal, which has a good physical
reason. I do not see anything like interfaces in your simulation. Interface
has to have n-coefficient defined between the surfaces.

 

Moreover, if you turn to UV photons, you no longer sum up simplified gamma
interaction hits in your module - you have traded your keV photons for
single eV photons! I think to have BOTH keV photons and eV photons in your
simulation, with different adders, you need to write two separate ones, and
run them separately.  With the same SEED (default) you will get the same
history for both simulation. 

 

Kind regards

 

Marcin Balcerzyk

Universidad de Sevilla.

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