Diapositive 1

1
Quality Control A long history starting from
1997
Use of the Laser monitoring system ? Follow
up the behavior of Crystals ? Transparency
corrections Feasibility
proved during test beam 1997
2
First LHC cycle in test beam Sept-Oct 1997

Signal processing red LED, green laser and test
pulse
Stability of the light distribution system
checked by PN ratio
Test of the compensation mechanism
Excellent Energy resolution maintained during
irradiations
3
Test Beam 1998 A disaster, all the channels
decrease by few a day
Study of the channels responses to Laser
performed During the test Beam 99 shows the
problem
A bad glue was used Ageing, the APD properties
was modified.
Quality control improved
4
Test of a matrix 6x6 Mars 99 no stability for
Channel response to green Laser due to

the glue which changed the APD
properties

Test of a matrix 6x6 Mai 99
Stability PN1/PN0 0.05
5
6x6 Matrix in theTest Beam June 99
6
Test Beam 2002 APD/PN very unstable 0.3
during two weeks
Problem identified the width of the Laser was
unstable A algorithm
for the correction was found and applied
Quality control needed for the Pulse
Shape reconstruction Quality
control needed for the Laser Shape
7
M0prime in the Test Beam July 02
Width of the Blue Laser not stable
Compute and control the Pulse Shape parameters
for each Laser runs
8

SM0 in the Test Beam Summer 03
MATACQ required
9
E0prime in the Test beam Summer 04
Monitoring analysis MATACQ and Pulse shape
analysis combined

-3 per day
10
E0prime in the Test beam July 04

-3 per day
-1.2 per day
XTal 37 (apatity)
Laser retuned
11
SM10 in the Test Beam Oct-Nov 04
Following the evolution of the laser shape

12
Based on test beam experience acquired from 1997
to 2004

Monitoring Data processing procedure
starting from VFE Electronics going to short
term calibration correction coefficients