A floating multi-channel picoammeter for micropattern gaseous detector current monitoring (CROSBI ID 220518)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Utrobičić, Antonija ; Kovačić, Marinko ; Erhardt, Filip ; Poljak, Nikola ; Planinić, Mirko
engleski
A floating multi-channel picoammeter for micropattern gaseous detector current monitoring
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.
Floating current measurement ; picoammeter ; digital readout ; GEM detector
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Podaci o izdanju
801
2015.
21-26
objavljeno
0168-9002
1872-9576
10.1016/j.nima.2015.08.021