1. Mean positions should be shifted by ~50m
Stave4004(Genova) Z-shift problem
Initial Z tuning was not symmetrical: POS_1(m6c)400m POS_13(m6a)500m for module-step distance (however within tolerance m for this distance)
Mean positions should be shifted by ~50m
The remaining Z shift can be explain by temperature effect and impossibility to control Z position of module on deposition table.

2. Temperature dependence
Mauro’s results(before Pixel week):
+55 24
24/9
+20 26
22/9
-75 30
21/9 27
20/9
DZ (µm)
T(ºC)
DATE
Dummy module was glued on stave at 270C and then another dummy module was deposited by robot at the same place at other temperatures.
This shift had an opposite direction!
After Pixel week: Experiments with screws – it was possible to obtain the shift from 0 to 70 m per 30C by tightening/relaxing different screws (unfortunately not in the right direction)
Shift of module on stave position due to change of temperature is big and can’t be controlled/predicted. The only way is a temperature stabilization.

3. Deposition table Flex covers a module-pin contact place
FE was glued on table so now it’s possible to control a module position on the table.

4. Actions
Temperature of the setup will be controlled and monitored with digital thermometer (2 sensors in different places). No way for robust temperature stabilization (too big room) so deposition moment will be changed if needed.
Z position of module on deposition table will be controlled with microscope (glued FE marks).
Initial Z tuning on stave will be done by symmetrization of 4 step-module distances (m6a,m6c,m1a,m1c positions)