Difference: Minutes2015-08-31 (1 vs. 2)

Revision 2
25 Sep 2015 - Main.ThomasHeld
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META TOPICPARENT name="ForwardEndcapMeetings"

Minutes of the forward endcap EMC SeeVogh meeting, 31st of August 2015, 14:00-15:00

Presence:

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  • If ommitting the origin in the "preamp output vs. deposited energy"-curve linear fit the data become consistent resulting in an preamp output offset of about 80 mV. We judge this as an accidental, unphysical consistence.
  • We will check again whether the nonlinearity of the shaper modules used in Bonn requieres an additional correction of the beam time data
  • May there also be an effect of 'different pulse shapes' for high and low energetic showers as reported in the past (Myroslav?)
Changed:
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  • VPTT preamp production can not be started until we definitelt know what gain regime we need for the preamps
  • 1,5 kV voltage divider PCBs for all PANDA VPTTs are ready and will be delivered from Basel so we can start mounting them to the tube bases
>
>
  • VPTT preamp production can not be started until we definitely know what gain regime we need for the preamps
  • 1.5 kV voltage divider PCBs for all PANDA VPTTs are ready and will be delivered from Basel so we can start mounting them to the tube bases
 
  • Even though we do not know the necessary absolute gain of the VPTT preamps we can already derive form the VPTT gain distribution by what amount the different gain ranges should differ: O(10%)
  • This is the same range the tolerance of the gain determining capacitors is stated. However, measurements show, that within a lot the tolerance is less, so building (three) different types of preamps is still forseen. Gain measurements of final preamps will be done anyway...

 
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