Difference between revisions of "QADC spectrum"

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|[[File:gain_voltage.png | thumb |alt=Example alt text|GEM voltage vs. the charge of the peaks appear as shutter is open (red, green) and close (blue)| 200px]]||
 
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|[[File:gain_voltage_ratios.png | thumb |alt=Example alt text| GEM voltage vs. the realtive gain of the peaks appear as shutter is open (red,green)and close(blue) | 200px]]||
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Revision as of 17:45, 31 October 2013

QDC Analysis

The first test for the detector signal after installing U-233 is by using CAEN V792 Q-ADC (Analog charge to digital converter). The aim of this test is to test the shutter ability to help in distinguishing the emitted particles from U-233 source based on liberated charge from their ionization in gas.


Example alt text
charge collected as the voltage is 2.60 2.90 kV for GEM and cathode successively
Example alt text
charge collected as the voltage is 2.65 2.95 kV for GEM and cathode successively
Example alt text
charge collected as the voltage is 2.70 3.00 kV for GEM and cathode successively
Example alt text
charge collected as the voltage is 2.75 3.05 kV for GEM and cathode successively
Example alt text
charge collected as the voltage is 2.80 3.10 kV for GEM and cathode successively


Example alt text
charge collected as the voltage is 2.60 2.90 kV for GEM and cathode successively
Example alt text
charge collected as the voltage is 2.65 2.95 kV for GEM and cathode successively
Example alt text
charge collected as the voltage is 2.70 3.00 kV for GEM and cathode successively
Example alt text
charge collected as the voltage is 2.75 3.05 kV for GEM and cathode successively
Example alt text
charge collected as the voltage is 2.80 3.10 kV for GEM and cathode successively


A Non-linear increase in the charge collected by the Q-ADC as the voltage increases for GEM HV-circuit, also the figures show the change in the charge spectrum as the shutter position changed, shutter open's charge spectra show more collected charge than that of shutter close.


Example alt text
GEM voltage vs. the charge of the peaks appear as shutter is open (red, green) and close (blue)
Example alt text
GEM voltage vs. the reltive gain of the peaks appear as shutter is open (red,green)and close(blue)



















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