[Gate-users] Optical Photons Detection

[Raphael Bögel]

Dear Gate users,

i think you may help me with a problem i don't get by with.
I want to detect optical photons with an ideal apd.

The system consists of an LSO crystal ideal apd behind it (x position).

The problem: nearly all optical singles are located on the opposite side
of the apd. 

The profiles look like this:

x location: peak .. low .. low .. low  <- exactly the opposite of what i
expected
y location: peak .. low .. low .. peak
z location: peak .. low .. low .. peak

Another consideration is that there are nearly no optical absorptions
meassured, just "Transportation".

The surface between the crystal and the apd is described by
"perfect_apd".
All other surfaces of the crystals are described by
"polished_teflon_wrapped". I added both at the end of the mail.


best regards,
Raphael



 <surface name="perfect_apd" type="dielectric_metal" sigmaalpha="0.0"
finish="ground">
    <propertiestable>
      <propertyvector name="SPECULARLOBECONSTANT" energyunit="eV">
    <ve energy="4.08" value="0"/>
    <ve energy="1.84" value="0"/>
      </propertyvector>
      <propertyvector name="SPECULARSPIKECONSTANT" energyunit="eV">
    <ve energy="4.08" value="0"/>
    <ve energy="1.84" value="0"/>
      </propertyvector>
      <propertyvector name="BACKSCATTERCONSTANT" energyunit="eV">
    <ve energy="4.08" value="0"/>
    <ve energy="1.84" value="0"/>
      </propertyvector>
      <propertyvector name="REFLECTIVITY" energyunit="eV">
    <ve energy="4.08" value="0.0"/>
    <ve energy="1.84" value="0.0"/>
      </propertyvector>
      <propertyvector name="EFFICIENCY" energyunit="eV">
    <ve energy="4.08" value="1."/>
    <ve energy="1.84" value="1."/>
      </propertyvector>
    </propertiestable>
  </surface>




  <surface name="polished_teflon_wrapped" type="dielectric_dielectric"
sigmaalpha="0.1" finish="groundbackpainted">
    <propertiestable>	
      <propertyvector name="SPECULARLOBECONSTANT" energyunit="eV">
	<ve energy="4.08" value="1"/>
	<ve energy="1.84" value="1"/>
      </propertyvector>
      <propertyvector name="SPECULARSPIKECONSTANT" energyunit="eV">
	<ve energy="4.08" value="0"/>
	<ve energy="1.84" value="0"/>
      </propertyvector>
      <propertyvector name="BACKSCATTERCONSTANT" energyunit="eV">
	<ve energy="4.08" value="0"/>
	<ve energy="1.84" value="0"/>
      </propertyvector>
      <propertyvector name="RINDEX" energyunit="eV">
	<ve energy="4.08" value="1"/>
	<ve energy="1.84" value="1"/>
      </propertyvector>
      <propertyvector name="REFLECTIVITY" energyunit="eV">
	<ve energy="4.08" value="0.95"/>
	<ve energy="1.84" value="0.95"/>
      </propertyvector>
      <propertyvector name="EFFICIENCY" energyunit="eV">
	<ve energy="4.08" value="0"/>
	<ve energy="1.84" value="0"/>
      </propertyvector>
    </propertiestable>  
  </surface>