[Halld-tracking-hw] Preamps

[Naomi Jarvis]

Good morning!

I would like to talk about the new preamp but I don't think there will 
be enough time in our tracking mtg this morning. 

The concerns are that the preamp output is topping out at around 500 mV 
even with the cosmics, and the gain for cosmics seems to have increased, 
whereas for Fe55 it was ~1/3 less.

I put one page on the wiki      
http://www.jlab.org/Hall-D/software/wiki/index.php/CDC#Preamp4_.28GlueXdoc1364_Tbl_2_Row_2.29
The recent cosmic runs there took a week each, and were with the chamber 
flat, ie 90 degree cosmics.   I'll add more data as it becomes 
available;  at present it is counting at 2kV. 

Can we set up a time to talk about this next week?   (The rest of this 
week is out for us; I think the only times we cannot do next week are 
1pm Tues + the regular mtg on Wed).

Thanks,

Naomi.