The Silicon Vertex Tracker for the SuperB detector is designed as an evolution of the BaBar SVT, based on double-sided strip detectors. The wider acceptance in polar angle (down to 300 milliradians) will imply larger incidence angles (up to 73°) on the sensors. On the z-side (reading out the z coordinate, along the beam direction) this results in large clusters with small signal values on individual channels. For optimum performance it would be desirable to continuously vary the sensor pitch on z-side versus position. An easy and convenient way to approximate this configuration is to bond two or three adjacent strips to a single trace of the fanout circuit that connects the strips to the front-end electronics (the so-called ‘pairing’ option). In order to accurately measure the total capacitance of strips in various pairing configurations (×2,×3,×4) two test detectors have been assembled on PCBs, and various strip connection schemes have been implemented by wire bonding, on p and on n-side, respectively. Capacitance and dissipation factor have been measured versus bias voltage and frequency. These data are being used to estimate the noise contribution of the detector and to choose the best z-side connection scheme in the SVT.
Characterization of strip detector parameters for the SuperB Silicon Vertex Tracker
RASHEVSKAYA, IRINA;BOSISIO, LUCIANO;LANCERI, LIVIO;VITALE, LORENZO;
2013-01-01
Abstract
The Silicon Vertex Tracker for the SuperB detector is designed as an evolution of the BaBar SVT, based on double-sided strip detectors. The wider acceptance in polar angle (down to 300 milliradians) will imply larger incidence angles (up to 73°) on the sensors. On the z-side (reading out the z coordinate, along the beam direction) this results in large clusters with small signal values on individual channels. For optimum performance it would be desirable to continuously vary the sensor pitch on z-side versus position. An easy and convenient way to approximate this configuration is to bond two or three adjacent strips to a single trace of the fanout circuit that connects the strips to the front-end electronics (the so-called ‘pairing’ option). In order to accurately measure the total capacitance of strips in various pairing configurations (×2,×3,×4) two test detectors have been assembled on PCBs, and various strip connection schemes have been implemented by wire bonding, on p and on n-side, respectively. Capacitance and dissipation factor have been measured versus bias voltage and frequency. These data are being used to estimate the noise contribution of the detector and to choose the best z-side connection scheme in the SVT.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
