1

Angle dependence of residual in Z niiyama

lambda < 10Layer 5

Lambda > 70layer4

Wave form of signal depends on the angle between the track and the pad plane.

The wave formIs distorted for largeDip-angle tracks.This effect is seenfor all layers.

Wave form of signals which used to calculate the center of spatial coor of the cluster.

300

2

The algorithm of finding Z in a cluster.

• Analyze in each pad• peak-time (a)• center-of-gravity in FWHM (b)

• take average in pads by weight of pulse height

• sum up adc value of each pad for every time bin ( projection)

peakCenter-of-gravity

Center-of-gravity in FWHM

time

Pad Id

time

Z calcuratedIn each pad

Take mean of Z coor from each pad by weight of pulse height

Pad Id

time Sum upAdc of each pad for each time bin

3

resZ vs Lambda peak time (a)

4

resZ vs lambda center-of-gravity in FWHM (b)

5

resZ vs Lambda projection & peak

6

resZ vs Lambda projection & take center-of-gravity in FWHM

7

• The dip-angle effect was not corrected.

• We need to manage multi-peak in a pulse.

In each time bin calculate (x,y,z) coor.and track them by RK or circle fitting

Pad Id

time