COMPARISON OF THE CALIBRATION VALUES 2000/2001
AND
MAGNET EFFECT

Rachid Nouicer : June 19, 2001

The goal for this work is to check the cabling to the FEC's and to the DMU crate. In addition I want to check that the  the configuration map has not been changed between 2000 and 2001.This work also compares the calibration values with magnet ON and OFF. The work is done only for the Inner and Outer Vertex detector.
The analysis has been done using the following runs :
- for the data 2000, I used run 4973 for the pedestals and run 4974 for the gain calibrations.
- for the data 2001, I used run 6195 for the pedestal and run 6196 for the gain calibrations
- for the data 2001 with magnet ON, I used run 6407 for the pedestals and 6410 for the gain calibration
- The plot  below correspond to the mean pedestal, mean gain and noiserms for every sensor on the  Inner and outer vertex detector. The error bar on the Y axis which is smaller correspond to the rms value.

Conclusion of the results :

-  Inner Vertex
a) from the pedestal and gain plots presented below, it  seems that the cabling and the configuration map are correct and they are the same as in 2000.
b) from the noise plot, it seems that the noise in VBA1 and VTA0 sensors is higher in 2001 than in 2000. After investigation, it seems that the map of the noise channels has not been  made for the 2001 run. This implies that during the analysis if you find that you have more hits in the VBA1 and VTA0 sensors, this mean that the map of the noise channels is not included. 

- Outer Vertex
a) from the pedestal and gain plots presented below, it  seems that the cabling and the configuration map are correct and they are the same as 2000.
b) from noise plots, VTA6 has more noise in 2001 than 2000. The problem is that the map of the noise channel has not been made for 2001.

- Magnet effect 
The magnet effect is defined in the following way   :
Magnet effect = (Noise with magnet ON - Noise with magnet OFF ) / Noise with magnet OFF

   From the plots presented below, it seems that the magnet effect using the noise runs is
    less than 0.6 % for the Inner Vertex and less than 0.8 % for the Outer Vertex

1 - Pedestal and the Gain for the Inner Vertex :

2 - Noise  for the Inner Vertex :

3 - Pedestal for the Outer Vertex :

4 - Gain for the Outer Vertex :

5 - Noise for the Outer Vertex :

6 - Noise in 2001 with Magnet ON and OFF on the Inner Vertex :

7 - Noise in 2001 with Magnet ON and OFF on the Outer Vertex :