16th July 2007

CALICE-UK MAPS ECAL meeting

at RAL

Yoshinari Mikami

University of Birmingham

Status of MAPS study

Longitudinal Shower shape

(100GeV photon)

Good agreement

Linearity comparison

50umX50um vs. 100umX100um

50umX50um is better.

Linearity comparison

MAPS vs. Diode

Good agreement

MAPS; Weighted #hits/event x 7.25keV(Mean cell hits energy at 100GeV photon)

Default Diode; Energy/event x 0.03(Si sensitive thickness ratio of 15um/500um)

Linearity residual comparison

(without charge diffusion and

without charge clustering)

-> 50umX50um is better than 100umX100um.

-> Diode pad has better linearity than MAPS.

(All are weighing by standard factor 1:2 for different W thickness layers.)

Linearity comparison

Without clustering vs. With clustering

Without clustering; ~106 hits/GeV

With clustering; ~ 73 hits/GeV

(No charge spread, no noise, no threshold and no dead area.)

Linearity residual comparison

Without clustering vs. With clustering

(No charge spread, no noise, no threshold and no dead area.)

->Without clustering is better linearity.

->It would be due to that cell boundary effect compensate the linearity wrongly.

Resolution comparison

At least up to ~100GeV,

->100umX100um is better resolution than 50umX50um at Geant4 level.

->Clustering has better resolution. (Consistent with AM's study)

Summary for clustering effect

In lower energy range (up to ~100GeV),

Linearity: Diode > 50umX50um > 100umX100um > Clustering

('Diode > MAPS' is due to multi hits in one MAPS cell.)

('50umX50um > 100umX100um > Clustering' will be due to

that cell boundary effect compensate the linearity wrongly.)

MAPS Resolution: Clustering > 100umX100um > 50umX50um

(The less boundary effect is the better resolution.

-->Agree with expectation)

(No noise, no threshold and no dead area.)

Linearity after charge diffusion

Resolution after diffusion

(No noise, no threshold and no dead area.)

Linearity

after diffusion+750eV threshold

(No noise and no dead area.)

Resolution

after diffusion+750eV threshold

(No noise and no dead area.)

Summary

Tested the linearity after charge diffusion and charge clustering.

Anne-Marie's clustering is working well even in 200GeV energy scale.

Backup slide (1)

2007-06-21T18:39:12