Draft: Implementation of the concentric layout with square shape chips.

Implementation of concentric layout with trapezoid sensors, outer pipe and new substrate for velo upgrade 2.

Overview of current implementation

Changes:

Concentric layout of sensors around the beam pipe.

1. Sensors forming inner and outer rings, at different z-positions. Number of sensor numbers the same.
2. The distance between the innermost (& outermost) row of pixels to the center is kept the same.

Concentric layout with square and trapezoid sensors

Trapezoid sensor

1. Only for the sensor. The chip, bump bond and glue remain square.
2. Parameters: height 15.910mm, lower_base 19.134mm, upper_base 5.954mm

Parameters derivation

Update procedure of the "ladder"

Substrate shapes changed for concentric layout.

1. The offset of substrate to chip's innermost edge is kept the same. (doesn't seem so on the plots?)

Updated substrate

An outer pipe at r=18mm. To place inner ring of sensors, some slices are needed.

Outer pipe with slices

To-dos:

1. Small fixes:

• The design should be selected by a parameter in xml. But currently the Detector/TV/src/TV_geo.cpp in CMakeLists is overwritten.
• Naming of some of the volumes should be corrected (like ladder)

2. Optimize position parameters of sensor, chip, substrate...
3. Parameterization?

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Validated by

• Core Software
• RTA
• Simulation