The data shown here are from run 1175 at 0 degree rotation angle, taken with sensor D35-S9-43. It is raw data without any cuts, exactly how it was read out. The plots shown here show the readout given by one pixel versus the readout of a different pixel (here pixel 20 and 21). In these plots one can distinguish 3 regions:

A) pedestal region. Both pixel have no hit, and are at their pedestal value. A correleation here indicates common noise in the system.

B1) Pixel 21 got a hit but pixel 20 has no hit and is at its pedestal value.

B2) Pixel 20 got a hit but pixel 21 has no hit and is at its pedestal value.

C) Both pixel got hit/charge sharing between them. Both pixel are not at their pedestal value

If one now looks at 2 pixel that are not neighboring like pixel 20 and 32 then one can see that the region C is empty. No charge sharing between the pixels. Looking at 2 adjecent pixel (20 and 21) we see charge sharing (region C). It can also be seen by the shape of region C that the chip is saturating. As there is charge collected with both pixels, there is no sign of a maximum charge, the signal of both pixel stay at the same level and are not decrease when there is charge also collected by the other pixel. If the chip were not saturating one would expect a distribuation on region C that looks more like a straight line from B1 to B2.

The same plots for Sudhir's data from the stand alone system: ("car_event_ru106_6_va_225_rgpr_230_halfacwpot.root")

("car_event_ru106_6_va_245_rgpr_230.root")

last up-dated 1-31-01 Comments? Contact Carsten Rott