Re: [fluka-discuss]: Source position

     WHAT(6) < 0.0:  WHAT(4) and WHAT(5), if positive, are interpreted as the
                     maximum and minimum radii of an annular beam spot. If
                     negative, they are interpreted as FWHMs of Gaussian
                     profiles as explained above, independent of the value of
                     WHAT(6).

Hi Vladimir

Just two observations:

when setting extended sources with the BEAM card, please have a look at
the manual Note 4

          4) All options governed by WHAT(3,4,5) are meaningful only if the beam
             direction is along the positive z axis, unless a command BEAMAXES is
             issued to establish a beam reference frame different from the
             geometry frame (see command BEAMAXES). If the beam is not in the
             positive z direction and no BEAMAXES command has been given,
             WHAT(3)-WHAT(5) must be set = 0.0 (unpredictable effects would arise

Furthermore, in your source.f you are setting your beam spot to
(36.,58,.-57), while later you are not using it for x and y

       XFLK (NPFLKA) = RADIUS * SFE
       YFLK (NPFLKA) = RADIUS * CFE

In order to display your source, I suggest to put a fluence USRBIN around
the beam spot (or even entire geometry) and inspect where beam particles
go..

Cheers
Stefan



On Fri, 1 Sep 2017, Vladimir Fedorov wrote:
 

 Dear experts!
  
 I unsuccessfully try to form a disk source 12C (see the fig.png) in the
 direction from a point, shown by arrow, to a point which is the center of dark
 green area (see fig1.png). The result is 0. Particles apparently fly somewhere
 incorrect direction . Additionally I made changes with the positioning of the
 source in source.f. The result is the same.
  
 Tell me, please, how to visualize the position of the source and direction of
 the particles?
  --
 Best regards
 V. Fedorov
  
 

(image/png attachment: res.png)