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User name mcnulty
Log entry time 09:28:57 on August25,2009
Entry number 285837
keyword=Prex test runlist
Prex test runlist: Starting 8/25 at 01:45
Data for 5uA on thin Ta
4303 ps2=1, ps3=1 (s0=1.4kHz, Scint=400Hz) Dipole settling to 1.206
4304 mostly beam tuning
4305 ps2=1,ps3=1 (quartz= about 1Hz for 1.206 (+0.7% dp/p))
4306 ps2=50,ps3=1 (quartz=10Hz for 1.202 (+0.4% dp/p))
4307 ps2=50,ps3=1 (quartz=1Hz for +0.7% dp/p)
4308 ps2=50, ps3=1 (quartz=10Hz for 1.198 (+0.1% dp/p))
4309 ", ", (quartz=25Hz for 1.194 (-0.2%) Dipole changing a bit here
Made Access (02:45-04:15) to check quartz signal cabling and replace 45deg quartz detector with 0deg 1cm thick quartz, checked ADC gate timing of quartz signal--to do this we needed to use a quartz detector self trigger--the timing was good. We reestablished the prex_scint trigger (T3). Also moved prex test dets 11mm away from beamline in y direction--for better y alignment.
4310 - 4313 Cosmic/DAQ tests
4314 ps2=50,ps1=1, (s0=1.5kHz,Scint=600Hz) Dipole is scanning here
4315 ps2=10,ps3=1 more dipole scanning
Note that after a preliminary analysis of these runs, the quartz signal is still difficult to distinguish from pedestal.
Made Access (0600-06:30) to change the T3 trigger from Scint to Quartz (note that now the quartz signal is R.cer.a and the Scint signal is R.cer.a).
Note that for all the above runs, the T3 threshold is 30mV
We are now taking 5uA on thick Ta using (-0.2% dp/p).
4316 threshold = 60, ps2=10 or 50?, ps3=1 (s0 rate is 10k)
4317 thresh=100, ps2=1,ps3=1 (T3 rate is ~250Hz)
4318 thresh=100, ps2=1,ps3=1
4319 thresh=100, ps2=50,ps3=1
4320 thresh=30, ps2=1, ps3=1
Many of these runs have been analyzed. The root files can be found here:
Pcture 1 shows a very raw pulse height distribution from the Quartz (self triggered). More analysis is needed to understand this distribution, but at least it is something besides a pedestal.