GEM and Mini Prototype DC Cosmics Run

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12-22-08

Setting Electronics

Using The Stanford Pulse Generator, Model DG535, four identical pulses were injected into the GEM(I mean output),, two PMTs and DC(first Metalica and then Plastika).

Four injected pulses into the Detectors 12-22-08.png


12-23-08

Noise Level PMTs Bottom1000Volts Top1052Volts.png


Mini DCs and GEM detectors are sandwiched between the two PMTs. The top scintillator is operated at 1050 Volts and bottom one-1000 Volts.

HV settings on GEM detector: [math]V_{Drift}=3300[/math] Volts and [math]V_{GEM}=3000[/math] Volts
HV settings on DCs: Sense=1450 Volts, Field=-725 Volts && Guard=724 Volts.

The coincidence pulse from two PMTs is used as a trigger and gate for GEM and DCs.

The PreAmp voltage on DCs is set to 6.4 Volts, the pulse form DC is amplified using PostAmplifier(amplification is on maximum). The TDC output of the amplified pulse is discriminated using the Leading Edge Discriminator and putted to the NIM-ECL converter, which than goes to the TDC(VME). The ADC output of the PostAmp was used for ADC(VME).

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