M.D. Nov 27th 2002

M0' analysis workshop 1

Monitoring system : lessons from M0’Monitoring system : lessons from M0’

Contents : Monitoring electronics Laser APD electronics Conclusions & requirements for 2003

M.D. Nov 27th 2002

M0' analysis workshop 2

Monitoring system descriptionMonitoring system description

M.D. Nov 27th 2002

M0' analysis workshop 3

MEM stability : Use self measurement of Vinj (stabilized at 10-4 / year)

Stability better than 50 V / 500 mV over 1 month

Monitoring electronicsMonitoring electronics

M.D. Nov 27th 2002

M0' analysis workshop 4

FE-Asic stability : Use electronics injection pulse

Rather good stability over 2 months (1/1000 drift)

Monitoring electronicsMonitoring electronics

2002/08/08

M.D. Nov 27th 2002

M0' analysis workshop 5

PN stability : Compare PN0 with PN2 (level1 fan-out) :

Not stable at all (2.5 % over 2 months) !

Monitoring electronicsMonitoring electronics

2002/08/08

M.D. Nov 27th 2002

M0' analysis workshop 6

PN stability : Look in archives : Accelerated aging

in oven in 200160-80 degrees

PN2 should have never been put on M0’ !Zero quality control on PN diodes at this time.

Monitoring electronicsMonitoring electronics

2001/03/06

PN0 PN2

PN3PN1

M.D. Nov 27th 2002

M0' analysis workshop 7

Energy stability :

Huge variation with time (short term and long term)“Raison d’être” of monitoring systemOK

LaserLaser

M.D. Nov 27th 2002

M0' analysis workshop 8

Pulse width stability :

Huge variation with time (short term and long term)

Huge effect on APD/PN0 Need to be monitored !

LaserLaser

d(f

pp

a)/d

Nanogreen laserParticles

Quantronix lasernominal

Quantronix laser2002

M.D. Nov 27th 2002

M0' analysis workshop 9

Electronics stability : Small dependence on T

No problem with present regulation Dependence with LV :

No significant change in gain up to nowPedestals affected

Regular pedestal runs Dependence with VFE mode :

Pedestal affected Free vs Forced mode Hard to monitor for hidden gains (G9, G5 and G1 in frre

mode) Dependence with laser energy

Pedestals affected Compute dynamic pedestals

Dependence with laser pulse widthConvolution with FPPA shaping time

Need to monitor laser pulse width event by event

APD lineAPD line

M.D. Nov 27th 2002

M0' analysis workshop 10

Electronics stability : Dependence with HV :

A priori big dependence of APD gain with HVNeed to checked stability of APD response with present HV

system On good channels :

VFE electronicsVFE electronics

= 1.4/1000

M.D. Nov 27th 2002

M0' analysis workshop 11

Back to crystal 1142 : Calibration drift by 5-6/1000 in 2 weeks :

Compare with electron runs

APD lineAPD line

Calibration runs @ 120 GeV

M.D. Nov 27th 2002

M0' analysis workshop 12

ConclusionsConclusions

Monitoring system : Need to implement an efficient quality control on PN diodes Electronics very stable but :

Need to clarify pedestal puzzle (fppa 200x) Need to monitor laser pulse width event by event

Requirement for 2003 Residual instabilities seems physical

Parasitic irradiationsHV fluctuation ?Red laser required for next year

To-do :Reprocess irradiation data with all the correction

Should be able to get S/R curves with PN diodes as only reference

Fine study of HV data