Dear Paola,
Right now I am using the normal Beam Card with C12, momentum
spread=0,angular distr. = 0, but I am planning to use the source.f
routine in the near future.
Regards
Yuri
2014-08-20 10:39 GMT+02:00 Paola Sala <paola.sala_at_mi.infn.it>:
> Dear Yuri,
> sorry, but I have to confirm that changing the energy in usrmed is NOT
> possible. It may seem to work, but it doesn't, it spoils preset
> quantities.
> There is a better and safer way to perform what you plan, that is to
> change the thickness of your foil event by event. In this way all the
> simulation will be self-consistent. I'll explain you how to do, only I
> would like to know if you are already using a "source.f" routine or not.
> Regards
> Paola
>
>
>> Dear Paola,
>>
>> thank you for your answer!
>> We have the following idea: There is a thin foil in the nozzle of a
>> particle therapie device. This foil has mesh structure and therefore:
>> 1. shifts the Bragg Peak of C12 Ions
>> 2. modulates(broadens) the BP
>> We want to take these 2 effects into account in Fluka. As it is quite
>> difficult to modell the mesh foil geometrically, we decided to replace
>> the mesh foil with a homogeneous one. This will only shift the BP. In
>> order to broaden it we want to use the UsrMed routine. The modulation
>> function of the foil (probability vs. particle range shift) is already
>> known. We want to sample from this function delta_z ("particle shift"
>> in cm) and convert it to delta_E using an ICRU49 equation. Delta_E
>> will be then added to the original Energy of the particle. This way we
>> can artificially broaden the BP.
>> Actually we already tried this and it seems to work fine. The only
>> problem is that I still use in my equation Z and A from the projectile
>> (IPROZ, IPROA), whereas I need the specific Z and A of each particle
>> flying into the material. Do you know how I can access them?
>>
>> Best regards
>> Yuri
>>
>> 2014-08-17 17:32 GMT+02:00 Paola Sala <paola.sala_at_mi.infn.it>:
>>> Dear Yuri Simeonov,
>>> The energy of particles cannot be changed inside usrmed.f, attempting
>>> to
>>> do s it would make the program crash or give meaningless results. If you
>>> could explain in more detail your problem could try to see if there is
>>> a
>>> way to solve it.
>>> Regards
>>> Paola
>>>
>>>> Dear fluka experts,
>>>>
>>>> I want to use UsrMed.f routine to modulate the energy of each particle,
>>>> which is transported into a user-defined material (Initial source is
>>>> C12).
>>>> As I calculate the energy using an equation, I need to know the
>>>> specific Z
>>>> and A of each particle inside the UsrMed (Z will vary due to
>>>> fragmentation). Which variables should I use?
>>>>
>>>
>>>
>>> Paola Sala
>>> INFN Milano
>>> tel. Milano +39-0250317374
>>> tel. CERN +41-227679148
>>>
>>
>
>
> Paola Sala
> INFN Milano
> tel. Milano +39-0250317374
> tel. CERN +41-227679148
>
Received on Wed Aug 20 2014 - 15:27:09 CEST