Dear Srinidhi,
you set a proton track-length scoring with the USRTRACK card you sent in the previous email.
The units are GeV-1 cm-2, provided that the region volume is set.
Please refer to Note 1 (and 2) of USRTRACK in the manual.
If you are interested in the energy deposited in you detector, go for USRBIN.
More details about scoring is available in these slides<
https://indico.cern.ch/event/540415/contributions/2194805/>.
Cheers, luigi
On 3 Mar 2017, at 01:10, Shri Bheesette <srinidhi.bheesette_at_cern.ch<mailto:srinidhi.bheesette_at_cern.ch>> wrote:
Hi Luigi,
Thanks for your additional feedback on the issue.
1. Will have a read through it.
2. USRTRACK: The value is expressed in GeV per cm2 per energy unit per primary right? This means I have to multiply it with this value with the width of my detector (1.4cm *1.4cm) to get the unnormalized-to-area value, is this right?
Thanks.
Cheers,
Shri
(Srinidhi Bheesette)
On 1 March 2017 at 22:38, Luigi Salvatore Esposito <luigi.salvatore.esposito_at_cern.ch<mailto:luigi.salvatore.esposito_at_cern.ch>> wrote:
Dear Srinidhi,
to complement the answer by Andrew:
1. to understand how the statistical uncertainty is evaluated in FLUKA, refer to these slides<
https://indico.cern.ch/event/540415/contributions/2194806/attachments/1285749/1912258/09_Statistics_and_sampling_2015.pdf> from last FLUKA course (in particular page 32 and following)
2. the volume in the USRTRACK seems to be not correct: 1.4cm*1.4cm*0.0055cm = 0.01078 cm3
Best regards, luigi
On 1 Mar 2017, at 05:38, Srinidhi Bheesette <srinidhi.bheesette_at_cern.ch<mailto:srinidhi.bheesette_at_cern.ch>> wrote:
Hi Andrew,
Thanks for the feedback:
1. I am sorry I forgot to mention it my mail. I am using a python script to run these simulation for 500000 times. (I could have specified this in the START card). But I did not understand why I need to run these with 5 independent random number seeds?
2. Is this URSTRACK card right?
<image.png>
I wish to score the energy deposited by protons on the SENSOR region with a dim (1.4cm*1.4cm*0.0055cm)
3. Sure, will post the plot with error bars shortly.
Thanks and hoping to her from you soon.
Cheers,
Shri
(Srinidhi Bheesette)
On 1 March 2017 at 15:26, Andrew Davis <andrew.davis_at_wisc.edu<mailto:andrew.davis_at_wisc.edu>> wrote:
Hi Srinidhi
There are a number of issues assuming that your input deck is representative
1) Your START card only contains a single history to run, from a single run of 1 primary you cannot make any assertions regarding the results of your calculation since you have a large statistical uncertainty. You should likely run several million histories with (at least) 5 independent random number seeds using the already established tools to perform the averaging.
2) You used a USRBIN score (with 1 bin for x-y-z) to determine the energy deposition, you might as well use a USRTRACK score, not an issue really, but I may’ve chosen a USRTRACK instead
3) Your plot doesn’t include any statistical error, its hard judge the accuracy of a Monte Carlo calculation without any mention of the statistical error.
Thanks
Andy
On Feb 28, 2017, at 4:57 PM, Srinidhi Bheesette <srinidhi.bheesette_at_cern.ch<mailto:srinidhi.bheesette_at_cern.ch>> wrote:
Hi all,
I have simulated a pixel detector (just a silicon sensor layer) in FLUKA and bombarding it with point neutron source at different energies from 1-25.5MHz with a step size of 0.5MHz. I run a single simulation.
I then score the energy deposited in the detector (one value for one run) and then plot a graph of the energy deposited on the x-axis the source energy on the y-axis shown below:
<image.png>
The energy seems to increase till 20MeV but then start fluctuating from 20.5 to 25.5MeV and also a spike at 17MeV
Am I missing some cards in my input file (attached) for activating some feature for neutron energies after 20MeV?
Please help.
Cheers,
Shri
(Srinidhi Bheesette)
<sensor-22.5MeV.inp>
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Received on Fri Mar 03 2017 - 11:49:18 CET