Hi Vasilis,
Tank you for your advice. I have used the EMFCUT card to filter out electron and photon transports that are happening at the higher layers of the atmosphere and used gradually reduced the filtering as I reach the layer AIR100 which is where the detector is. For 1000 event, it takes around 7 minutes to complete a run. thus 1E6 events would take 700 minutes which is still quite a bit of time. Would you recommend that I start gradually reducing the threshold later instead of what's already in the input file? Do you think the results will stay accurate enough? Thank you for your help so far.
Regards,
Michel Georges Najarian
________________________________
From: Vasilis Vlachoudis <Vasilis.Vlachoudis_at_cern.ch>
Sent: Thursday, April 11, 2019 2:15 AM
To: Michel Georges Najarian; fluka-discuss
Subject: RE: EMFCUT strategy
Hi Michel,
the electromagnetic process has an exponential cost in CPU time the lower the energy cuts you put.
Below a few MeV you don't have any photo-nuclear interactions (anyhow a tiny contribution which in fluka
it has to be enabled explicitly). Thus the only contribution from simulating electrons/photons for low
energies is only for energy deposition purposes, of course very close to your detector.
So my approach would have been far away from the sensitive region use high cuts (several MeV or
even higher). You have to experiment with sort runs and profile the cpu time.
Lower the cuts close to your detector, without going below a certain point
that the range of the em particles is much shorter than the scoring you are interested.
Vasilis
________________________________
From: owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it] on behalf of Michel Georges Najarian [michel.najarian_at_edu.uwaterloo.ca]
Sent: Wednesday, April 10, 2019 16:13
To: fluka-discuss
Subject: [fluka-discuss]: EMFCUT strategy
Hi FLUKA experts,
I'm using the two-step method to simulate cosmic rays hitting a detector in Ottawa. So far, I've been able to complete both steps but I'm now trying to include electron and photon transport, which I didn't include initially as the computational time was way too big. Thus I decided to use the EMF card with EMF-OFF SDUM to drastically reduce computational time. Reading on EMFCUT, I theorized that I'd be possible to get turn on EMF only for specific regions which wouldn't require as much computation time as having EMF on for all the regions.
As a result, my question is, what's the best way/strategy to simulate electron and photon transport, using the EMFCUT card, in order to have results with reasonable computational time? From which layer of the atmosphere should I start simulating electron and photon transport in order to have accurate enough results? Thank you very much!
Regards,
Michel Georges Najarian
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Received on Fri Apr 12 2019 - 17:11:01 CEST