Overlapping geometry

[thnam]

Currently there is one overlap in our geometry:

Checking overlaps for volume TargetBorderShielding ... OK!
Checking overlaps for volume BeamWindow ... OK!
Checking overlaps for volume BeamWindowT ... 
-------- WWWW ------- G4Exception-START -------- WWWW -------
*** G4Exception : GeomVol1002
      issued by : G4PVPlacement::CheckOverlaps()
Overlap with volume already placed !
          Overlap is detected for volume BeamWindowT
          with MuTrigger volume's
          local point (3.77962,43.7113,84.8), overlapping by at least: 200 um 
NOTE: Reached maximum fixed number -1- of overlaps reports for this volume !
*** This is just a warning message. ***
-------- WWWW -------- G4Exception-END --------- WWWW -------

The offending volume is the BeamWindowT (appears to be the black tape outside of the beam port) in every subgeometry configuration: https://github.com/alcap-org/g4sim/blob/master/alcap/configure/sub_all/subgeo_default#L67-L69

    T 0 Rp1I thTp 0 360 BeamWindowT 1 World Plastic none S pRw0+thw0/2+thTp/2 0 180 0 0 0

An easy fix for this is pull the MuTrigger block back a bit:

-       B    XTr   XTr   LTr    MuTrigger    1     World     Air          none         S pRTr  0    180     0    0    0
+       B    XTr   XTr   LTr    MuTrigger    1     World     Air          none         S pRTr+thTp  0    180     0    0    0

Another issue is the tape we used seems to be typical electrical tape made of polyvinyl chloride (density 1.3), but assigned as Plastic (density ~ 0.95 in the material list). I added the PVC material and set it accordingly.

[thnam]

The fix is applied on SiR2, Al100 and the default subgeo.

[AndrewEdmonds11]

Thanks, Nam. I'll be sure to make the same correction with the files I use.

[thnam]

So I was wrong about the black things in front of beam ports. It should be black paper (Tedlar®, made of PVF), the tape was just keeping the paper in place. I changed the layer to PVF.