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
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