LCTPC WP Phone Meeting #71 – 26.11.2008

Micromegas module 1

D. Attié, P. Colas, M. Dixit, Yun-Ha Shin, R. Woods

TPC Tests Analysis Meeting, DESY 28 May 2009

Comparison of kapton Comparison of kapton and ink resistive and ink resistive

detectorsdetectors

Description of the detectors

2

Detector Dielectric layer Resistive layerResistivity

(MΩ/□)

Resistive Kapton

Kapton

70 μm

C-loaded Kapton

25 μm ~4-8

Resistive InkEpoxy-glass

100 μm

Ink (3 layers)

~50 μm~1-2

TPC Tests Analysis Meeting - Resistive detectors comparison -

Resistive Kapton Resistive Ink

PCB

Kapton

Resistive Kapton

PCB

Prepreg

Resistive Ink

Glue

1-2 μm

Glue

1-2 μm

Comparison at B=1T, z ~ 5 cm

3TPC Tests Analysis Meeting - Resistive detectors comparison -

Resistive Kapton Resistive Ink

• RUN 310

• vdrift = 230 cm/μs

• Vmesh = 380 V

• Peaking time: 500 ns

• Frequency Sampling: 25 MHz

• RUN 549

• Vdrift = 230 cm/μs

• Vmesh = 360 V

• Peaking time: 500 ns

• Frequency Sampling: 25 MHz

Dead pad: [row: 54; column: 18]

Pad Response Functions

Resistive Kapton

4TPC Tests Analysis Meeting - Resistive detectors comparison -

Resistive Ink

Γ = 6.6 mm

δ = 10.4 mm

Γ = 10.8 mm

δ = 12.7 mm

Spatial resolution at z = 4.3 cm

5TPC Tests Analysis Meeting - Resistive detectors comparison -

Resistive Kapton Resistive Ink

σ [z=4,3 cm] = 130 μm σ[z=4,3 cm] = 72 μm