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Dear all, i am a newbie to GATE, so, i ask apologize if the question
that i will make is naive.<br>
<br>
I am trying to simulate an optical fibber with and without clad.<br>
The fibber should be surrounded by a liquid containing a radioactive
source.<br>
My idea was to make a cylindrical source with a cold area
corresponding to the fibber volume.<br>
<br>
I have started with a fibber without clad:<br>
<br>
###############<br>
##GEOMETRY<br>
###############<br>
/gate/world/daughters/name Fibras<br>
/gate/world/daughters/insert cylinder<br>
/gate/Fibras/geometry/setRmax 1.0 mm<br>
/gate/Fibras/geometry/setHeight 80. cm<br>
/gate/Fibras/setMaterial Polystyrene<br>
/gate/Fibras/vis/setColor yellow<br>
/gate/Fibras/vis/forceSolid<br>
<br>
(...)<br>
#defining the volume and shape of source<br>
/gate/source/Radiation/gps/type Volume <br>
/gate/source/Radiation/gps/shape Cylinder <br>
/gate/source/Radiation/gps/radius 1.05 mm <br>
/gate/source/Radiation/gps/halfz 35. cm <br>
/gate/source/Radiation/gps/centre 0. 0. 0. cm <br>
#Make no activity region on fibers<br>
/gate/source/Radiation/gps/Forbid Fibras<br>
<br>
<br>
And i got the picture NoClad.png.<br>
It seams to work fine.<br>
Them i have decided to add the clad and the only difference was in
the geometry:<br>
<br>
<br>
###########<br>
###GEOMETRY WITH CLAD<br>
###########<br>
/gate/world/daughters/name Fibras<br>
/gate/world/daughters/insert cylinder<br>
/gate/Fibras/geometry/setRmax 1.06 mm<br>
/gate/Fibras/geometry/setHeight 80. cm<br>
/gate/Fibras/setMaterial Polystyrene<br>
<br>
/gate/Fibras/daughters/name Core<br>
/gate/Fibras/daughters/insert cylinder<br>
/gate/Core/geometry/setRmax 1.0 mm<br>
/gate/Core/geometry/setHeight 80. cm<br>
/gate/Core/setMaterial Polystyrene<br>
/gate/Core/vis/setColor yellow<br>
/gate/Core/vis/forceSolid<br>
<br>
/gate/Fibras/daughters/name Clad<br>
/gate/Fibras/daughters/insert cylinder<br>
/gate/Clad/geometry/setRmax 1.06 mm<br>
/gate/Clad/geometry/setRmin 1.0 mm<br>
/gate/Clad/geometry/setHeight 80. cm<br>
/gate/Clad/setMaterial PMMA<br>
/gate/Clad/vis/setColor blue<br>
/gate/Clad/vis/forceSolid<br>
<br>
<br>
(...)<br>
#defining the volume and shape of source<br>
/gate/source/Radiation/gps/type Volume <br>
/gate/source/Radiation/gps/shape Cylinder <br>
/gate/source/Radiation/gps/radius 1.11 mm <br>
/gate/source/Radiation/gps/halfz 35. cm <br>
/gate/source/Radiation/gps/centre 0. 0. 0. cm <br>
#Make no activity region on fibers<br>
/gate/source/Radiation/gps/Forbid Fibras<br>
<br>
But, in this case, the source cold area is not correct (see
WithClad.png)<br>
<br>
In this last part i didn't got the message:<br>
<br>
"Confirming activity forbidden in volume 'Fibras_phys'...<br>
Activity forbidden in volume 'Fibras_phys' confirmed"<br>
<br>
<br>
My question is: is not possible to define a cold area based on
volume and its daughters?<br>
<br>
Your knowledge and help will be very appreciated:<br>
<br>
<br>
<br>
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<p>Carlos Azevedo <br>
Physics Department<br>
University of Aveiro<br>
Portugal</p>
<p>
<a href="mailto:cdazevedo@ua.pt">cdazevedo@ua.pt </a></p>
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