GOAT Update Tanaz Angelina Mohayai, for the GOAT team November 16, 2018 HPgTPC Meeting
Purpose Reuse ALICE TPC Inner and Outer Readout Chambers ( IROC and ALICE TPC OROC ) for DUNE near detector high OROC pressure gaseous Argon (ND HP IROC GAr) TPC: ALICE: operated @ 1 atm with Ne- CO 2 -N 2 gas mixture IROC/OROC 2 T. A. Mohayai 11-16-2018
Purpose Reuse ALICE TPC Inner and Outer Readout Chambers ( IROC and ALICE TPC OROC ) for DUNE near detector high OROC pressure gaseous Argon (ND HP IROC GAr) TPC: ALICE: operated @ 1 atm with Ne- CO 2 -N 2 gas mixture IROC/OROC DUNE HP GAr TPC: will operate @ 10 atm with Ar-? gas mixture ALICE frontend electronics will not be provided 3 T. A. Mohayai 11-16-2018
GOAT Test Stand G aseous-Argon O peration of the A LICE T PC, GOAT Test ALICE readout chambers at 10 atm and in Ar-? gas mixture (currently 90-10 Ar-CO 2 ) Field Cage Develop front-end electronics Main components: Drift: field cage Ortec IROC Signal readout: preamp ALICE IROC Front-end: preamps and CAEN 50 cm digitizers 4 T. A. Mohayai 11-16-2018
GOAT Test Stand G aseous-Argon O peration of the A LICE T PC, GOAT Test ALICE readout chambers at 10 atm and in Ar-? gas mixture (currently 90-10 Ar-CO 2 ) Field Cage Develop front-end electronics Main components: Drift: field cage IROC Signal readout: ALICE IROC New Front-end: preamps Solution and CAEN 50 cm digitizers 5 T. A. Mohayai 11-16-2018
PASA: an Intermediate Preamplifier Solution for GOAT 40-pads connection for readout with a single Ortec channel 16-channel PASA V out + P re- A mplifier S haping A mplifier, PASA : Intermediate solution before new ideas 16-channel charge sensitive shaping amplifier V out - Differential output – further upgrade to readout system required (a next step) 6 T. A. Mohayai 11-16-2018
Previously on PASA IROC Signal Readout with PASA First attempt: Directly connected PASA to chamber (with original 40-pad setup) Led to disagreement between resulting signal and PASA response function Expected PASA Response Function Difgerential G 4 function after output Output subtraction 7 T. A. Mohayai 11-16-2018
PASA Response to a Function Generator 190 ns FWHM 4mV input signal x 2pF capacitor = 8fC or 50k electrons, with 95mV amplitude/8fC = 11.8mV/fC gain (close to 12.75mV/fC conversion gain of PASA) Input signal: a 4 mV single pulse charging up a 2 pF capacitor Output signal from PASA: agrees with the expected 8 T. A. Mohayai 11-16-2018
Summary and Next Steps Using a function generator, the PASA response function agrees with the expected G 4 distribution Further studies are underway to suppress the noise in the PASA board (current signal-to-noise ratio 10:1) Next steps: Develop new front-end scheme where PASA differential output is converted to a single output for input into CAEN Use PASA in a single-pad connection scheme (as opposed to the current 40-pad connection) 9 T. A. Mohayai 11-16-2018
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