MCNPX - Question in SDEF card about AXS and EXT

  • #1

Main Question or Discussion Point

My code version is 2.7

I have a disk source of R=0.3 cm, 60 cm above in z axis. I want set limits for the x and y axis, but, I can only put one command "axs" and "ext". How can i define two limits with one command?

my code it is like this
SDEF pos=0 0 60 rad=d1 axs=1 0 0 ext=d2 PAR=2 ERG=0.018 VEC=0 0 1 DIR=-1
SI1 0 0.3
SP1 -21 1
SI2 -1 9
SP2 0 1

i want define x to -1 to 9, and y to 9 to 9.

Like this
upload_2018-10-24_21-5-38-png.png


Help me in the question, please.
 

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Answers and Replies

  • #2
121
35
Hi,
for my part I will simplified with a rectagular parallel beam:
***
sdef par=P pos 0 0 -60 axs 0 0 1 ext 0 vec 0 0 1 dir 1 erg 1 &
X=d1 y=d2 Z=0
Si1 -1 9
sp1 0 1
Si2 -9 9
sp2 0 1
***
In YX plan it gives :

upload_2018-11-2_11-20-35.png
 

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  • #3
Hi, i'm using the same model as yours. do you know if there is any difference in results the cone model, for this?

very thanks.
 
  • #4
121
35
The difference must be low because the angle is less than 10 deg and the Energy is very low (18 keV)
 

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