MCNPX - Question in SDEF card about AXS and EXT

[Alexander Camargo]

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

Help me in the question, please.

 

[PSRB191921]

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 :

 

[Alexander Camargo]

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.

 

[PSRB191921]

The difference must be low because the angle is less than 10 deg and the Energy is very low (18 keV)