Abstract
Data logging and complex algorithm implementations acting on multichannel systems with independent devices require the use of time synchronization. In the case of Gas Electron Multipliers (GEM) and Thick-GEM (THGEM) detectors, the biasing potential can be generated at the detector level via DC to DC converters operating at floating voltage. In this case, high voltage isolation buffers may be used to allow communication between the different channels. However, their use add non-negligible delays in the transmission channel, complicating the synchronization. Implementation of a simplified precise time protocol is presented for handling the synchronization on the Field Programmable Gate Array (FPGA) side of a Xilinx SoC Zynq ZC7Z030. The synchronization is done through a high voltage isolated bidirectional network interface built on a custom board attached to a commercial CIAA_ACC carrier. The results of the synchronization are shown through oscilloscope captures measuring the time drift over long periods of time, achieving synchronization in the order of nanoseconds.
Highlights
Gaseous detectors are an integral part of present and future instrumentation in particle physics
In the case of Gas Electron Multipliers (GEM) and Thick-GEM (THGEM) detectors, the biasing potential can be generated at the detector level via DC to DC converters operating at floating voltage
Implementation of a simplified precise time protocol is presented for handling the synchronization on the Field Programmable Gate Array (FPGA) side of a Xilinx SoC Zynq ZC7Z030
Summary
Gaseous detectors are an integral part of present and future instrumentation in particle physics. Thick-GEM (THGEM) detectors are robust multipliers with high gains (104–106 at 1 Torr) manufactured using standard Printed Circuit Board (PCB) technology [2] These detectors need different bias voltages applied to the electrodes, often with values in the order of kV. To study fast transient, such as the propagation of electrical discharges in different segments of an electrode, a time-stamp resolution for current/voltage monitoring in the order of 10 ns or better is needed [5]. A multichannel HVPSS allows the implementation of automatic protocols to stabilize the gain during pressure and temperature variation as well as to prevent possible unstable conditions without user intervention This configuration enables logging environmental conditions during fast transients so as to study the propagation of electrical discharges between electrodes and segments for further studies on critical conditions with the final goal of preventing them. A description of the implementation is presented
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