Difference: Minutes2014-10-13 (1 vs. 2)

Revision 2
15 Oct 2014 - Main.FritzHerbertHeinsius
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META TOPICPARENT name="ForwardEndcapMeetings"

Minutes of the forward endcap EMC meeting, 13th of October 2014, SeeVogh, 10:30 - 11:40

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Preamp gain for VPTT
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Tobias: gain response at B=0.9 T and HV=1000 V about 60% less (tbc. by Bonn measurements). From ELSA test beam: 145 mV/MeV thus maximum 1044 mV. Some tubes have higher gain, so expect maximum 1402 mV with current preamp.
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Tobias: gain response at B=0.9 T and HV=1000 V about 60% of signal without magnetic field (tbc. by Bonn measurements). From ELSA test beam: 145 mV/GeV thus maximum 1044 mV. Some tubes have higher gain, so expect maximum 1442 mV with current preamp.
  Conclusion: 34% more gain would be better = 0.63 V/pC. Werner will produce two preamps, Bochum will test them.

Note (Malte): the preamp with factor 2 higher gain has longer rise time (30 ns) and fall time decreased by factor 2.
 
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