RE: [fluka-discuss]: Access to tracking informations in USERDUMP

From: <>
Date: Tue, 07 Feb 2017 14:45:32 +0100

Dear Anton,

you have given me a very clear explanation, providing all the
information I needed. Now I know where the variables are saved and how
to access them. Thank you very much for your help.

About the MGREAD issue, I managed to solve it on my own. The macro
works if I remove the reading and writing of the variables
CXX,CYY,CZZ, that, I think, are not written by the standard mgdraw
output, but by the modified one in chapter 12 of the manual. Anyways,
I am writing in formatted output for the moment, so it does not
actually matter.

Again, thank you for the information and the help.
Best regards,

Quoting Anton Lechner <>:

> Dear Antonio,
> In order to reproduce the problem with MGREAD, could you be so kind
> and send a minimum working example (input file, routines and maybe
> the MGREAD file if you made modifications).
> Meanwhile (since your problem is reading, not dumping) you could try
> to already use a customized MGDRAW routine to get the information
> you need. MGDRAW has an entry (USDRAW) which is called whenever you
> have an interaction (if activated by means of the USERDUMP card). In
> particular, in this entry, one can distinguish the type of
> interaction (via the value of ICODE), one can determine the current
> region/position in the geometry (via MREG, XSCO, YSCO, ZSCO), and
> one can access information about secondaries produced in this
> interaction (looping over particles in GENSTK). With following code
> snippet inserted into USDRAW you could filter out the events which
> are inelastic collisions of primaries (using the generation number
> LTRACK, which is 1 for primaries and making use of the ICODE
> variable, which is 101 for inelastic nuclear collisions). For
> simplicity, I directly write formatted output to unit 50, so no need
> to convert to ascii (you can change this of course).
> * Inelastic collision of a primary
> IF ( LTRACK .EQ. 1 .AND. ICODE .EQ. 101 ) THEN
> *
> * Dump the location of the inelastic collision:
> WRITE( 50,* ) "Inelastic coll at ", XSCO, YSCO, ZSCO
> *
> * Loop over all secondaries and dump their particle code, kinetic
> * energy, statistical weight and direction cosines:
> DO 10 INP = 1, NP
> WRITE( 50,* )
> & ' Part=',KPART(INP),' E=',TKI(INP),' Weight=',WEI(INP),
> & ' Tx=',CXR(INP), ' Ty=',CYR(INP),' Tz=',CZR(INP)
> *
> Note that this code does not consider re-interactions of secondary
> hadrons. If you also want particles produced in re-interactions, you
> need to modify the first if statement (just in case: the particle
> code of the incident particle is accessible via the JTRACK variable).
> Cheers, Anton
> ________________________________________
> From: []
> Sent: 03 February 2017 17:32
> To: Anton Lechner
> Cc:
> Subject: RE: [fluka-discuss]: Access to tracking informations in USERDUMP
> Dear Anton,
> I managed to compile the MGREAD program, but when I try to run it, it
> prints only a few lines and I get this error:
> 'Fortran runtime error: I/O past end of record on unformatted file'.
> About the information: for all the events, I need to know the position
> of the interactions of the source pions in the target, then dump of a
> list of the numbers, momenta and directions of the directly produced
> secondaries. In fact, I intend to study the physical background of
> hadronic interactions for charm mesons' decay measurement in nuclear
> emulsions.
> Thank you for your help.
> Best regards,
> Antonio.
> Quoting Anton Lechner <>:
>> Dear Antonio,
>> Can you be a bit more specific why you cannot read the MGDRAW output
>> with the MGREAD program given in the manual? Did you manage to
>> compile and run it?
>> There is a lot of information written by the default MGDRAW routine.
>> If you tell us more about what you intend to do (e.g. dump particle
>> information at boundary crossings, or dump a list of secondaries
>> produced in interactions), then it might be easier to give some
>> advice.
>> Cheers, Anton
>> ________________________________________
>> From:
>> [] on behalf of
>> []
>> Sent: 30 January 2017 13:18
>> To:
>> Subject: [fluka-discuss]: Access to tracking informations in USERDUMP
>> Dear FLUKA experts,
>> I am a new user, and I am currently learning how FLUKA works. I
>> realized the geometry of the experiment and I made some test runs, but
>> I cannot understand how you access tracking data such as momentum,
>> particle name and number of produced secondary particles in the event
>> (in my case, I want to analyse interactions of a pion beam impining on
>> a Mo target).
>> From the guides and the manual, I learned that the routine mgdraw.f
>> provides, through the card USERDUMP, a collision tape of the event,
>> and that the variables I look for might be present in TRACKR and
>> accessible after some modifications of the user routine.
>> Before modyfing mgdraw.f, however, I would like to learn how it works,
>> but it seems I cannot read the binary file through and/or the
>> MGREAD program contained in flair and in the FLUKA manual. Can you
>> please tell me the commands to use them, or an alternative solution to
>> access the data?
>> I know this may be a silly question, but please answer me.
>> Best regards,
>> Antonio Iuliano.
>> __________________________________________________________________________
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Received on Tue Feb 07 2017 - 16:24:10 CET

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