ASIC meeting June 14, 2010
Contents
Meeting Time and Place
Monday June 11, 2010 at 10:00am At Jefferson Lab, the meeting will be held in room F326-327
Connections
To connect from the outside, please use ESNET
1.) ESNET: 8542553
2.) Phone:
+1-800-377-8846 : US
+1-888-276-7715 : Canada
+1-302-709-8424 : International
then enter participant code: 77438230# (remember the "#")
Agenda
Performance Plots for the ASIC
The following links go to pages that compare the performance of the older preamplifier to the newest version of the ASIC. We note that the interposer board was not used for the older preamplifier and that the Struck FADCs we have at CMU are set to a scale such that 1 volt coresponds to about 4000 channels. We note that the new preamplifier does not exceed ~2000 channles here because the output voltage is now (apparently) limited to 0.5V.
- Preamp 4 : Comparison of scope traces with earlier preamps
- Preamp 4: Comparison of cosmic data with original preamp
- Preamp 4: Comparison of 55Fe data with original preamp
Efficiency Plots for the CDC
The following plot is taken from our NIM article that shows the chamber efficiency as a function of the high voltage setting for various gas mixtures. As can be seen, for the optimal gas mixture (around 50/50), the plateau starts at about 2100 V and there is no efficiency below around 1900V.
2050V - cosmics - max amplitude histogram
2050V- cosmics - energy
