MAPS Simulation Status

Contents

Energy (#cell_hits) resolution without clustering

- Incoming energy dependence

- Cell size dependence

Linearity with incoming energy dependence

Yoshinari Mikami

University of Birmingham

MAPS meeting at Rutherford Appleton Laboratory

30th November 2006

#Cell_hits/event Resolutions (1)

20 GeV e-

RMS / Mean = 101.5 / 2064

= (4.92 +/- 0.07)%

60 GeV e-

RMS / Mean = 287.3 / 5896

= (4.87 +/- 0.07)%

100 GeV e-

RMS / Mean = 469.3 / 9544

= (4.92 +/- 0.07)%

140 GeV e-

RMS / Mean = 667.7 / 13060

= (5.11 +/- 0.07)%

15um Si sensitive thickness

50um X 50um cell size

5000 events

#cell_hits / event

#cell_hits / event

Single electron from IP to zenith with magnet on.

1 GeV e-

RMS / Mean = 18.3 / 84.8

= ( 21.6 +/- 0.3)%

5 GeV e-

RMS / Mean = 38.8 / 533

= (7.3 +/- 0.1) %

In the lower incoming energy case, it show clear Gaussian distributions.

In the higher incoming energy cese, some events has #cell_hits leakage.

#cell_hits / event

#cell_hits / event

#Cell_hits/event Resolutions (2)

15um Si sensitive thickness

25um X 25um cell size

5000 events or 1000 events

20 GeV e-

RMS / Mean = 141 / 2559

= (5.51 +/- 0.17)%

60 GeV e-

RMS / Mean = 379 / 7323

= (5.18 +/- 0.16)%

140 GeV e-

RMS / Mean = 909 / 16350

= (5.56 +/- 0.18) %

100 GeV e-

RMS / Mean = 625 / 11940

= (5.24 +/- 0.17) %

#cell_hits / event

#cell_hits / event

1 GeV e-

RMS / Mean = 26 /112

= (23.2 +/- 0.3)%

5 GeV

RMS / Mean = 55 / 670

= (8.3 +/- 0.1)%

Slightly worse resolution compared with 50um x 50um cell size.

#cell_hits / event

#cell_hits / event

#Cell_hits/event Resolutions (3)

15um Si sensitive thickness

100um X 100um cell size

5000 events or 1000 events

20 GeV e-

RMS / Mean = 81.3 / 1772

= (4.59+/- 0.15)%

60 GeV e-

RMS / Mean = 239 / 4998

= (4.79+/- 0.15)%

100 GeV e-

RMS / Mean = 418 / 7993

= (5.23+/- 0.17)%

140 GeV e-

RMS / Mean = 554 / 10810

= (5.12+/- 0.16)%

#cell_hits / event

#cell_hits / event

1 GeV e-

RMS / Mean = 14.9 / 70.8

= (21.0 +/- 0.3) %

5 GeV e-

RMS / Mean = 30.7 / 459

= (6.7 +/- 0.1) %

Slightly better resolution compared with 50um x 50um cell size.

#cell_hits / event

#cell_hits / event

Single Electron Energy Resolution
Without Clustering

No threthold is applied for cell hit energy

Counting number of cell hit in a event without clustering.

LDC01 (first 20 layers: W thickness = 2.1mm

last 10 layers: W thickness = 4.2 mm)

->We did not use a weighted number at this moment. (Please see next slide)

Very preliminary

Thicker W thickness

Effect of absorber

Reduction of incoming energy

Decreasing number of secondary particles

Effect of radiator

Increasing number of secondary particle

The weighted mean factor is convoltion of the above two effects.

LDC01 (first 20 layers: W thickness = 2.1mm

last 10 layers: W thickness = 4.2 mm)

->We did not use a weighted number at this moment.

Linearity of #Cell hits/event
with incoming energy dependence

Uncertainty is within

No threthold is applied for cell hit energy

Counting number of cell hit in a event without clustering.

LDC01 (first 20 layers: W thickness = 2.1mm

last 10 layers: W thickness = 4.2 mm)

->We did not use a weighted number at this moment. (Please see previous slides)

In the higher incoming energy case, the linearity is slightly saturated.

It agrees with the leakage in lower tail of #cell_hits/event distribution.

(Please see page 2, 3 and 4.)

Summary of status

36 and 48 contiguous cell hits pattern study

-Fixed a minor bug in double count removing

-Cell size dependence

-Incoming energy dependence

Resolution study

-Using a wighted mean for different W thickness layers

-Consistency check with the same thickness for all layers

-Sensitivity for clustering methods

Clustering

-Demonstration with a simple method is started just recently.

2006-04-25T10:56:42