Re: age of particles

Steffen and Rob,

ATRACK is not the time since first interaction, but the time since the start
of the primary particle. The primary particle is loaded into stack with
ATRACK = 0 and the time is updated at every step

Alberto

On Thu, 9 Jul 2009, Steffen Mueller wrote:

> Hi Rob,
>
> this might help you, just saw it recently as I also had the same question:
>
> http://www.fluka.org/web_archive/earchive/new-fluka-discuss/1026.html
>
> According to this ATRACK is not the age of the track but the time since first
> interaction, which is - as far as I understood - what you were asking for.
>
> Cheers,
> Steffen
>
> Rob Appleby wrote:
>> Dear FLUKA experts,
>>
>> I would like to save in mgdraw.f the age of a particle, with t=0 at the time
>> of the first interaction. i.e. the total age.
>> ATRACK in TRACKR gives the age of the track which needs to be summed up over
>> the history to give the total age of a final particle.
>> I've used SPAREK as a running time sum through the cascade, which I update
>> in
>> stuprf.f after every hadronic interaction by adding ATRACK to this running
>> sum
>> (adding the TRACK age of the parent). This gives (I think) the age of the
>> final particle, when read out in mgdraw at the end, with a contribution for
>> every track ending in a hadronic interaction. In stupre.f I also do the same
>> thing for EM interactions, except the particles produced in the EM
>> interaction
>> are already pushed onto the stack and so I can't add the parent age to the
>> running sum in SPAREK. I tried adding
>> AGEMF(Npstrt) but this is already the daughter particles and so equal to 0.
>>
>> Is this possible to update the running sum correctly, or is there a better
>> way
>> to get this total age?
>>
>> Many thanks,
>> Rob
>>
>> ***********************************
>> Rob Appleby, EN/MEF, CERN.
>> robert.appleby_at_cern.ch
>> Tel: +41 22 76 76532
>> ***********************************
>>
>>
>>
>
>

-- 
Alberto Fasso`
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