Most of the interaction is done at the machine midtwist
in the M13 Counting Room's "Executive Class". The login at that
machine is twistonl, with the usual TWIST password. You
can also log into midtwist with the usual TWIST account name and
password.
Below, you'll find procedures for the following tasks:
When PACT sparsification is off, ADC outputs from all PACT
channels are recorded; when it is on, only ADC outputs with signals
are recorded. To turn sparsification off/on, go to the Midas status
page and click on FBusC1 (the link just below the row of
buttons at the top of the page); then scroll down to
"C_Start_sparsified" and set it to 0 (for sparsification
off) or 1 (for sparsification on). Do the
same with FBusC2 or you'll only affect one crate!
When sparsification is turned on, the PPC (computer controlling the
Fastbus crate) will read the file ~/online/ppcobj/ped.dat
looking for pedestal values. At the moment, it will load for each
individual channel a threshold:
threshold = pedestal + n*deviation
where n = 2 (hardcoded for now, will become a param in settings
soon).
These thresholds are loaded in memory when the PPC boots or when the
mode is changed from NO_SPARSIFY to
SPARSIFY. There is no mechanism yet to tell the PPC that
the contents of the pedestal file has changed. This will be coming
soon. If you change the values, shutdown the PPC program and reboot.
To turn target PACT readout OFF:
---------------------------------
From the Status page
Select FbusC1 on 3rd row from the top
Select end_link , set it to 4
Select C_Start_ntdc, set it to 0
Back to Status page
Select FbusC2 on 3rd row from the top
Select end_link , set it to 4
Select C_Start_ntdc, set it to 0
To turn target PACT readout ON:
---------------------------------
From the Status page
Select FbusC1 on 3rd row from the top
Select end_link , set it to 3
Select C_Start_ntdc, set it to 1
Back to Status page
Select FbusC2 on 3rd row from the top
Select end_link , set it to 3
Select C_Start_ntdc, set it to 1
twistonl@midtwist
cd online_qod
setenv MTIN /twist/data_onl/current/... (use your run)
./qod
@ped
ana 10000
func 21
exit
SC_ADC.xxx and
PC_ADC.xxx files.
cp PC_ADC.xxx /home/twistonl/online/ppcobj/
cp PC_ADC.xxx /home/twistonl/online/ppcobj/ped.dat
DC's are varied from 2000 V down to 1600 V in 50 V steps. PC's are varied from 2200 V down to 1600 V in 50 V steps. Any planes not being varied are to be set to their nominal voltages (see the "nominal settings" file).