Homogeneity of Small Chambers T4, T6, T7, T8 and Gas Gain Measurements of Frascati and

Roma Chambers

Emmanuel Angulo (CSU Fresno)Weekly Meeting ATLAS Muon Micromegas

7/8/2012

Cu X-Ray Measurements

• 90 Positions (0.9cm x 1cm)

• HV of Strips @ 520 • HV of Drift @ 300• X-Ray with 1mm

collimator and cu foil cover @ 100000 event count, and @ 10mm distance from chamber

Cu X-Ray 1 2 3 4 5 6 7 8 9 10

1

2

3

4

5

6

7

8

9

T4 (10mm to 5mm Drift) Unifortmity

T6 Uniformity

Corner points 1cm x 1cm

Middle point 6cm x 5cm

1 2

5

3 4

Connector 1

Connector 1

Connector 2

Connector 2

Connector 2

Connector 2

T6 Uniformity

T7 Uniformity

Corner points 1cm x 1cm

Middle point 4cm x 5cm

1 2

5

3 4

Connector 1

Connector 1

Connector 1

Connector 2

Connector 2

T7 Uniformity

T8 Uniformity

Corner points 1cm x 1cm

Middle point 4cm x 5cm

1 2

5

3 4

Connector 1

Connector 1

Connector 1

Connector 2

Connector 2

Noise up to Ch 143(Bad signal with connector 2)

T8 Uniformity with 55Fe

•25 Positions (1.8cm x 1.8cm)

• 3mm Collimator Hole @ 50000 event count

•Strip HV @ 520•Drift HV @ 300

Roma and Frascati Chambers Gas Gain 55Fe Measurements

1

3

5

2

4

• 5 Positions (1.8cm x 1.8cm) • 3mm Collimator Hole @ 20000 event count • Strip HV from 440-560• Drift HV @ 300

HV Connectors

X-Strips

Y-Strips

Frascati Gas Gain

440 450 460 470 480 490 500 510 520 530 540100

1000

10000

100000

Gas Gain X-Strips

Position 1 Position 2Position 3Positon 4Position 5

Strip HV

Gas G

ain

440 460 480 500 520 540 5601000

10000

100000

Gas Gain Y-Strips

Position 1Position 2Position 3Position 4Position 5

Strip HV

Gas G

ain

440 460 480 500 520 540 560100

1000

10000

100000

Gas Gain (X Vs Y Strips)

X-Strip Pos 1Y-Strip Pos 1X-Strip Pos 2Y-Strip Pos 2X-Strip Pos 3Y-Strip Pos 3X-Strip Pos 4Y-Strip Pos 4 X-Strip Pos 5Y-Strip Pos 5

Strip HV

Gas G

ain

Roma Gas Gain

440 460 480 500 520 540 5601000

10000

100000

Gas Gain X-Strips

X-Strips Pos 1X-Strips Pos 2X-Strips Pos 3X-Strips Pos 4X-Strips Pos 5

Strip HV

Gas G

ain

440 460 480 500 520 540 5601000

10000

100000

Gas Gain Y-Strips

Y-Strips Pos 1Y-Strips Pos 2Y-Strips Pos 3Y-Strips Pos 5Y-Strips Pos 4

Strip HV

Gas G

ain

440 460 480 500 520 540 5601000

10000

100000

Gas Gain (X Vs Y-Strips)

Y-Strips Pos 1Y-Strips Pos 2Y-Strips Pos 3Y-Strips Pos 5Y-Strips Pos 4X-Strips Pos 1X-Strips Pos 2X-Strips Pos 3X-Strips Pos 4X-Strips Pos 5

Strip HV

Gas G

ain