Münster 2011 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 39: Instrumentierung - Poster
HK 39.29: Poster
Wednesday, March 23, 2011, 14:00–16:00, Foyer Chemie
Simulation study and measurements of ultra-thin readout kapton cables for CBM silicon tracking system — •Minni Singla1 and Sudeep Chatterji2 — 1Goethe University Frankfurt — 2GSI Darmstadt
We report on the status of simulation and measurement of thin Aluminum-Kapton cables for the CBM silicon tracking system. The cables are used to tranfer analog signals from the microstrip sensors to the front-end electronics which is mounted outside the fiducial region due to material budget constraints. These cables have been simulated using Raphael, a subpackage of Synopsys. Raphael has been validated by simulating and comparing our results with ANSYS simulations of D0 kapton cables and then by comparing our results with the theoretically known formula. The purpose of these simulations is to optimize the cables so as to reduce the capacitive load from these cables on the front end electronics. The cable capacitance depends on the metal trace width, trace height, thickness of spacer and dielectric constant of the spacer material. The spacer is a polyimide sheet used to separate two kapton layers and to reduce the capacitance contributions from the adjacent layers. If the trace width is reduced to small values (which reduces the capacitance) then the trace height should also be reduced so as to maintain an aspect ratio (=trace width/trace height) of approximately 2-3. However, this would reduce the surface area of the trace leading to a large value of trace resistance. Hence, we have studied the trace resistance using metal traces of different resistivities like Cu and Al. Supported by GSI, HIC for FAIR, EU FP7 Hadronphysics2.