[Halld-level1] [New Logentry] PS trigger studies

[somov at jlab.org]

Logentry Text:
--
The PS trigger was set up and operated relatively 
well during the evening/night shift. We collected
several million events at a relatively small
trigger rate of 600 Hz for the TAGM/TAGH and PS 
calibration and efficiency studies (we have a problem
presumably with a fadc, which caused a DMA readout
error at high rate -  to be checked during 
access to the Hall). Most data were taken in 
the readout mode 7.

Production run was set for the night shift with the PS, TAGH/TAGM and TRD

Run conditions:
PS converter 10^-3, radiator 2x10-5 - 10^-4,
very stable runnning conditions.
GTP trigger rate - 2 kHz (600 Hz accepted rate)


run 4167
--------
PS and PSC only, rate 300 Hz, 2x10^-5 radiator
260 k events

run 4168
--------
the same conditions, ~700 k events


TAGH HV scan done with Nathan

run 4172
--------
TAGH voltage -100 V

630k events

run 4173
--------
TAGH voltahe -50 V

Change TAGM fadc readout threshold from 30 to 20
Change TAGH readout threshold from 200 to 70

500 k events

run 4174
---------
TAGH voltage - 150 V
570 k events

run 4175
--------
TAGH voltage +50 V
650 k events

run 4177
--------
TAGH voltage +100 V
Change TAGH readout voltage to 200
300 k events

run 4178
--------
TAGH voltage +150 V
430 k events



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This is a plain text email for clients that cannot display HTML.  The full logentry can be found online at https://logbooks.jlab.org/entry/3367450
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