Conference Paper

The Chicagoland Observatory Underground for Particle Physics cosmic ray veto system

Fermi Nat. Accel. Lab. Batavia, Batavia, IL, USA
DOI: 10.1109/NSSMIC.2010.5873871 Conference: Nuclear Science Symposium Conference Record (NSS/MIC), 2010 IEEE
Source: IEEE Xplore

ABSTRACT A photomultiplier (PMT) readout system has been designed for use by the cosmic ray veto systems of two warm liquid bubble chambers built at Fermilab by the Chicagoland Observatory Underground for Particle Physics (COUPP) collaboration. The systems are designed to minimize the infrastructure necessary for installation. Up to five PMTs can be daisy-chained on a single data link using standard Category 5 network cable. The cables is also serve distribute to low voltage power. High voltage is generated locally on each PMT base. Analog and digital signal processing is also performed locally. The PMT base and system controller design and performance measurements are presented.

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    ABSTRACT: A newly developed parallel resonant DC-DC high-voltage converter for photomultiplier bases is presented. The converter makes use of the leakage inductance and secondary-side stray capacitance of its set-up transformer to form a resonant circuit. A Cockcroft-Walton multiplier then generates high voltage from the intermediate voltage of the transformer secondary. Regulation is closed loop and provides an output that is a multiple of an analog reference voltage. For digital systems, a digital-to-analog converter drives the reference. This design features low power dissipation, low electromagnetic-interference emission, relative ease of remote operation, and the elimination of HV cables
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