The simpliest way to define Cerenkov
detector status during the run :
-
Run monitor either from DD rings or from a file. This program
will create a GLOBAL section (default MON).
-
Start paw (or paw++) from other window.
-
Connect to this global section :
PAW > global_sect MON
-
Go to CC subdirectory :
PAW > cd CC
-
type :
PAW > ccstat
(if you are from clasrun account) or
PAW > exe $CLON_KUMAC/ccstat
You will see something like that :
CC status
The green cells indicate the PMT is OK. The yellow cell can
indicate that it is small number of events and you need to wait
to encrease statistics or that it is small difference in PMT amplitude
to the standard one. Red color indicates that this PMT needs to be tested
by Cerenkov detector expert - probably it is BAD.
The other way to test Cerenkov detector status (advanced)
Also from CC subdirectory you type :
PAW > ccmon [sector number]
After that you will see 4 histogramms on the screen:
CC sector histogramms
That histogramms are mostly for experts, them show the CC
amplitude and time as a function of PMT number.
Upper left histogramm shows two-dimensional plot of CC amplitude
in form of photoelectron numbers as a function of PMT.
You have to check here that
-
most of all events starts at zero amplitude.
The upper right histogramm shows the X projection ; the bottom
left histogramm shows the Y projection of previous histogramm.
On the upper right histogramm you have to see that
-
number of photoelectrons varies from 0 to 15-20.
On the bottom left histogramm you have to check that
-
ALL PMT are functional
-
Odd/even PMT have approximately same values.
Finally the bottom right histogramm shows the
time (in channels) as a function of PMT number. Here you need to see
that
-
ALL PMT are functional
-
Odd/even PMT have approximately same values.
-
The mean time should be about 700 - 1000 channels.
