Difference between revisions of "April 13, 2011 Tracking CDC/FDC"
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Fernando would send Gerard more preamps (FDC and CDC versions) for linearity tests. | Fernando would send Gerard more preamps (FDC and CDC versions) for linearity tests. | ||
| − | Fernando mentioned the temperature sensor on the preamps, he would like to remove it. | + | Fernando mentioned the temperature sensor on the preamps, he would like to remove it. After some discussion he decided to do some measurements to see how temperature-sensitive the gain is. |
==FDC and CDC updates== | ==FDC and CDC updates== | ||
There was nothing astonishing to report so in view of the time we left these updates for next week. | There was nothing astonishing to report so in view of the time we left these updates for next week. | ||
Revision as of 16:38, 13 April 2011
Meeting Time and Place
Wednesday April 13, 2011 at 11:00am At Jefferson Lab, the meeting will be held in F326
Connections
To connect from the outside, please use ESNET
- ) ESNET: 8542553
- )To connect by telephone, dial:
- You can look up toll-free number at http://www.readytalk.com/intl
- US and Canada: (866)740-1260 (toll free)
- International: (303)248-0285 (toll call)
- enter access code followed by the # sign: 3421244#
Agenda
- Announcements
- FADC-125 Discussion
- FDC Update
- CDC Update
- Status of the Construction.
- Status of the hook-up wires.
- Coax terminator for PCB End Terminator Terminator
Minutes
Participants: Curtis, Naomi, Gerard, Lubomir, Simon, Dave, Eugene, Fernando
FADC125
Gerard presented some linearity tests that he had made with his preamp (configuration to be determined by Fernando) and the fADC125, the preamp showed considerable nonlinearity at half the ADC range. This raised the possiblity of doubling the ADC gain. The FDC cathodes show preamp saturation at about 80% of the ADC range so the FDC could use a gain increase of 20% but not 200%. Gerard suggested using 2 variants of the fADC.
CDC results with cosmics at CMU show nice separation from noise but the fADC values are 50% less than expected. There is a concern that increased noise in Hall D might hide the minimum ionizing peak but increasing the fADC gain will not change this. We would have to increase the HV and maybe use a quencher to suppress afterpulses.
Fernando would send Gerard more preamps (FDC and CDC versions) for linearity tests.
Fernando mentioned the temperature sensor on the preamps, he would like to remove it. After some discussion he decided to do some measurements to see how temperature-sensitive the gain is.
FDC and CDC updates
There was nothing astonishing to report so in view of the time we left these updates for next week.
