[Halld-cpp] TAC detector signal test
Beni Zihlmann
zihlmann at jlab.org
Mon Mar 21 10:16:23 EDT 2022
Hi All,
I had a look at the TAC signal right at the input to the fADC250.
This is located in channel 0, slot 20, D2-3-TOP
HV used is channel 20, module 14 (double slot size), D2-8-TOP. The
channel in the module is labeled "TAC".
HV = -1700V drawing about 585uA. The trip limit is set at 1000uA.
attached you find 3 pictures of a scope shot for documentation.
The noise level is very low, smaller than 0.5mV. There is a clear but
very small 50Hz baseline modulation visible
at the level of about 0.4mV peak to peak.->TAC_signal3.png
The signal itself has a rise time of about 3ns and a decay time of about
8ns (both 10% to 90% and 90% to 10% respectively).
With a trigger threshold at 10mV the rate is very small way below 1Hz.
->TAC_signal1.png
Higher trigger rates, 10Hz or more (my estimate), is seen with very low
trigger threshold (less than 1mV). -> TAC_signal2.png
Based on these observation the detector looks operational working quite
nice. These tests can however not assess the
functionality at high rates.
cheers,
Beni
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