MCNPX - Question in SDEF card about AXS and EXT

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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109
32
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
 

Attachments

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.
 
109
32
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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