Dear allpix2 developers,
When I choose fixed MIP as source particle, hitting the sensor at different position vertically, the plots in the GenericPropagtion which shows the charge carriers moving path and the final transfered charge to the strip are not matched. See plots below,
This is when MIP hit to the strip center, holes are collected by the implant. Theoretically the charge should be mostly collected by single strip, but when I check the output, charge are equally distributed to two strips:
=== 1 ===
--- mydetector ---
--- Printing MCParticle information (0x22160c0) -------------------------
Particle type (PDG ID): -1
Local start point: 10 mm | 10.062 mm | -0.15 mm
Global start point: 10 mm | -37.938 mm | -0.15 mm
Local end point: 10 mm | 10.062 mm | 0.15 mm
Global end point: 10 mm | -37.938 mm | 0.15 mm
Linked parent: <nullptr>
Linked track: <nullptr>
-------------------------------------------------------------------------
--- mydetector ---
--- Pixel charge information
Pixel: (0, 80)
Charge: 8945 e
Local Position: (0, 10, -0.15) mm
Global Position: (0, -38, -0.15) mm
--- Pixel charge information
Pixel: (0, 81)
Charge: 8325 e
Local Position: (0, 10.125, -0.15) mm
Global Position: (0, -37.875, -0.15) mm
As a comparison, where is when MIP hitting at the strip edge, charge carriers(holes) are moving to two adjescent strips,
while in the output file, charges are mostly collected by single strip:
=== 1 ===
--- mydetector ---
--- Printing MCParticle information (0x36ae190) -------------------------
Particle type (PDG ID): -1
Local start point: 10 mm | 10 mm | -0.15 mm
Global start point: 10 mm | -38 mm | -0.15 mm
Local end point: 10 mm | 10 mm | 0.15 mm
Global end point: 10 mm | -38 mm | 0.15 mm
Linked parent: <nullptr>
Linked track: <nullptr>
-------------------------------------------------------------------------
--- mydetector ---
--- Pixel charge information
Pixel: (0, 79)
Charge: 140 e
Local Position: (0, 9.875, -0.15) mm
Global Position: (0, -38.125, -0.15) mm
--- Pixel charge information
Pixel: (0, 80)
Charge: 19740 e
Local Position: (0, 10, -0.15) mm
Global Position: (0, -38, -0.15) mm
--- Pixel charge information
Pixel: (0, 81)
Charge: 180 e
Local Position: (0, 10.125, -0.15) mm
Global Position: (0, -37.875, -0.15) mm
The non-linear electric fields used in this job are generated by TCAD software:
The charge transfering behaviors really make me confused.
