BCM test in low current for g2p

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Presentation transcript:

BCM test in low current for g2p Pengjia Zhu May 12th 2011

g2p Polarized target NH3 Low current running 50~150 nA Test of the low current measurement in Hall A Parasitic tests with current experiment using HAPPEX cavities and DAQ Test in 25~500nA current using regular BCM and cavity with HAPPEX DAQ

BCM setup Cavity Regular BCM Beam 25~500nA Up Down Up Down -3dbm Splitter -3dbm PreAmplifier PreAmplifier emily preAmplifier ~15dB PREX preAmplifier ~30dB Downstream HAPPEX receivers Upstream V to F HAPPEX ADC Scaler

Crosscheck of upstream and downstream signal Test of signal to noise ratio of electronics and check of linearity

500,250,125,75,50,25nA emily preAmplifier ~15dB Pregain of electronic upstream 9 downstream 10

Current Dadc 500nA 130 250nA 107 125nA 95 75nA 91 50nA 88.4 25nA 87.6

Current Dadc 500nA 130 250nA 107 125nA 95 75nA 91 50nA 88.4 25nA 87.6

Current Dadc 25nA 110 50nA 113 75nA 117 100nA 128 200nA 149 PREX preAmplifier ~30dB 25,50,75,100,200nA Pregain of electronic upstream 4 downstream 6

emily preAmp Current Dadc 25nA 110 50nA 113 75nA 117 100nA 128 200nA 149

emily preAmp Current Dadc 25nA 110 50nA 113 75nA 117 100nA 128 200nA 149 75nA 91 50nA 88.4 25nA 87.6