ARCs cut definition for TEC modules

Javier Fernandez Menendez

Institut für Experimentelle Kernphysik

Karlsruhe University

TEC meeting

14th July 2004

Javier Fernandez (IEKP/UniKa) 2

ARCs TEC Data on the web• R1: 31N + 19S from Hamburg• R2: 21S + 26N from Wien (problem in 2 APVs)

• R3: 31 from Ka + 23 from Ham (x-check)

• R4: 26 modules from Zurich

• R5: not enough statistics yet in community…

• R6: 23 from Aachen

• R7: 24 from Strasbourg

Total: ~230 modules = ~2.5Gb of data in files

Javier Fernandez (IEKP/UniKa) 3

What cuts can be defined?

Pinhole Open

Healthy

Noisy

No statistical criteria here: tagged as bad channels anyway in DB

Statistical and graphical criteria

Not use APV border channels for cuts definition

Javier Fernandez (IEKP/UniKa) 4

Methodology

Noise for all modules from one geometry in one single APV mode

Javier Fernandez (IEKP/UniKa) 5

Methodology: an example

Border Channels:1,2, 128, 129, 255, 256, 384, 385, 511, 512

Next to border channels:127, 130, 254, 258, 383, 386

0.9 (~4

1.3 (~4

Symmetric 4cut from

mean for healthy region definition

Javier Fernandez (IEKP/UniKa) 6

Final result of cuts

1.3 (~4)

0.9 (~4)

Noisy channels perfectly tagged!!!

Still room for fluctuations

(4 = 99.95% probability)

Health

y regio

n

Javier Fernandez (IEKP/UniKa) 7

Summary of noise 4 cutsMode R1 R2 R3 R4 R6 R7

Mean 1.0 1.02 1.11 1.13 1.33 1.44

0.05 0.07 0.05 0.04 0.05 0.06

Plow 0.80 0.75 0.90 0.95 1.10 1.20

Phigh 1.20 1.30 1.30 1.30 1.55 1.70

Mean 1.37 1.40 1.54 1.59 1.70 1.80

0.05 0.08 0.07 0.05 0.06 0.06

Dlow 1.15 1.10 1.25 1.40 1.45 1.55

Dhigh 1.60 1.70 1.85 1.80 1.95 2.05Stereo and Normal R1 show ~equal noise values

Noise and cuts increase with R#

Javier Fernandez (IEKP/UniKa) 8

R2 modules problem

Lower average noise in central APVs

Effect not seen in other geometries with 6 APVs (R1 and R5)

Javier Fernandez (IEKP/UniKa) 9

It makes distribution not gaussian

Central APVs

Not-central APVs contribution

Javier Fernandez (IEKP/UniKa) 10

Not an apparent Wien test problemPIO PIOn

DIO DIOn

Wien Karlsruhe

R2 Module 26690

Javier Fernandez (IEKP/UniKa) 11

Not an apparent Wien test problemPIO PIOn

DIO DIOnWien Aachen

R2 Module 26697

Javier Fernandez (IEKP/UniKa) 12

Conclusions• There is a clear behavior difference between:

channels at the borders of the APV and channels next to channel border

• Noise cuts defined/confirmed for TEC mods. – Program mainAnalyzer (in DefAna package)

allows to redefine them in an easy way if needed and do extensive module analysis/comparisons

• Noise ~equal in stereo and normal modules

• Statistical gaussian method: first iteration

• 4 symmetric criterium maybe too tight ?

• But 5could be too loose in some cases…