QtPALS

Changelog QtPals 180102 - added settings save and load INSTALATION HW: pulses max +/- 0.5V, use atenuators for bigger pulses (good are picotech TA050: Attenuator Set) connect signals to DRS4 card as follows: Ch1 - Start Ch2 - Stop Ch3 - Stop2 (optional for 3detector setup) Ch4 - trigger input As triger use sum signal from BK OUT CFD (Ortec 583,584), it shoud be done using 20dB ateunators and standard BNC Tee. CFD windows are set like in analog setup, but little bit more wide Run DRS Oscilloscope, set card to +/-5V, 5.12GS/s sampling and do amplitude and time calibrations; Check signal and trigger with DRS4 Oscilloscope, trigger on Ch4, write Trigger delay and amplitude Close DRS Osciloscope and run QtPALS 1.) Options->Configuration - choose 2D or 3D (two detectors or three detector setup) 2.) set INV according to pulses from detectors, chceck it for negative pulses 3.) set CFD value (0.25 for anode outputs, 0.038 for bipolar dynode outputs) 4.) set trigger like in DRS osciloscope 5.) Start Stop windows set later, according to measured energy histograms 6.) run QtPALS (green play button) and observe energy historams E1,E2,E3, set energy windows according to measured energy histograms in configuration window 7.) Close QtPALS application and reopen it. 8.) Click on New button and select directory where lifetime spectrums will be stored 9.) Run application. Default counts is set to 1e6, you can change it in all histogram windows, by setting NTotal 10.) After finishing measurement store it by Save button Results: 2D mode T1 - Ch1 start(narrow), Ch2 stop T2 - Ch1 start(wide), Ch2 stop T3 - Ch2 start(narrow), Ch1 stop T4 - Ch2 start(wide), Ch1 stop T5 - optinal not usable, diference between pulse amplitude and pulse area 3D mode T1 - Ch1 start(narrow), Ch2 stop T2 - Ch1 start(narrow), Ch3 stop T3 - Ch1 start(narrow), (Ch2+Ch3)/2 stop T4 - Ch1 start(wide), (Ch2+Ch3)/2 stop T5 - Ch2(stop)-Ch3(stop) FWHM ? more info: http://iopscience.iop.org/1742-6596/505/1/012044/ doi:10.1088/1742-6596/505/1/012044 its possible to store "CDB" matrix in 3d mode, its T1 vs T2 (X,Y) Z is counts, usable to filter as CDB spectrum to get better SNR