Hi Hayley,
You don't need to activate LOW-NEU since it is already active with the PRECISIOn default that you are using.
The fact that you don't get any energy deposition in the BLM means that either particles do not reach the BLM gas region (your primary particles may go along the beam line without losses, or losses occur far enough from the BLM) or they cross the BLM gas volume without interactions. To examine that, plot the FLUENCE of particles to see if anything reaches the BLM and whether some interaction is apparent.
Once you are sure that there are showers reaching the BLM active volume, you could change the gas material or increase its density to evaluate whether your problem is just statistics.
I recommend also to 'test' your setting first by sending a beam to a BLM, once you are sure things work OK, you can use your setup of magfld + source
- Mario
From: <owner-fluka-discuss_at_mi.infn.it<mailto:owner-fluka-discuss_at_mi.infn.it>> on behalf of "hayley.smith_at_stfc.ac.uk<mailto:hayley.smith_at_stfc.ac.uk>" <hayley.smith_at_stfc.ac.uk<mailto:hayley.smith_at_stfc.ac.uk>>
Date: Thursday, August 20, 2015 9:15 AM
To: fluka-discuss <fluka-discuss_at_fluka.org<mailto:fluka-discuss_at_fluka.org>>
Subject: [fluka-discuss]: Modelling a beam loss monitor
Hi All
I'm attempting to model the response of an ionisation beam loss monitor. The ionisation monitor is filled with argon gas. As the lost beam interacts with the gas it should create charged particles, which I wish to count.
I have tried to score the charged particles in the gas in a USRBIN, but I am unable to see any evidence of these reactions. I have also tried scoring the energy deposition by region binning and from this work out the charge. However I am seeing no energy deposition. I have tried using a USRBDX to look at boundary crossings between regions but these results contradict the fluence from the USRBIN?
I have turned on IONTRANS, IONFLUCT and DELTARAY but I am unsure if I need to use LOW-NEU to model this effect?
I have been looking at this presentation as a guide:
https://www.fluka.org/free_download/course/triumf2012/Workshop/Lavrik.pdf
What is the best method for modelling the response of an ionisation beam loss monitor? What mistakes am I making?
Many thanks for any help you are able to give - the required input files are attached.
Hayley
Hayley Smith
ISIS Facility
Rutherford Appleton Laboratory
Harwell Oxford
OX11 0QX
01235 445524
hayley.smith_at_stfc.ac.uk<mailto:hayley.smith_at_stfc.ac.uk>
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Received on Fri Aug 21 2015 - 04:32:53 CEST