Naslov
A floating multi-channel picoammeter for micropattern gaseous detector current monitoring

Autori
Utrobičić, Antonija ; Kovačić, Marinko ; Erhardt, Filip ; Poljak, Nikola ; Planinić, Mirko

Izvornik
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment (0168-9002) 801 (2015); 21-26

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Floating current measurement ; picoammeter ; digital readout ; GEM detector

Sažetak
This paper presents a concept of a multiple channel picoammeter suitable for operation at a high voltage. To ensure floating operation, 1 kHz readout rate and low battery usage, the picoammeter employs an optical fibre for data transmission. The analogue conditioning section consists of a transimpedance amplifier that is connected to a 16 bit Sigma Delta ADC which is integrated into the microcontroller. Simultaneous reception of data sent from multiple picoammeter units is achieved using an FPGA device and a USB interface to the host PC. A prototype with a +/- 125 nA range was constructed. The paper includes a calibration procedure of the prototype and an example of a current leakage test conducted on a 10x10 cm2 GEM foil. The resolution achieved by the prototype in a 15 min test at 0, 5 nA bias was 6, 5 pA FWHM.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Elektrotehnika

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