DAQ Tasks for Spring 2015 Commissioning Run
- Minimum requirement for ST event with good timing:
- ADC
- TDC
- Matched particle track
- Thresholds:
Scalers: - individual threshold for each channels or common threshold : determine - control of thresholds TDC: - individual threshold for each channels or common threshold : determine - control of thresholds ADC: - individual threshold for each channels or common threshold : determine - control of thresholds
If ADC or TDC work with common threshold all gains need to be matched to assure uniform discrimination
Flash ADCs Pedestals: automatic procedure for measuring pedestals on-demand when DAQ idle as part of special pedestal trigger as a part of regular data taking system for storing results in a database system for tracking changes over time semi-automatic procedure for setting pedestals make available for download after approval
ST Channels
develop gain matching procedure
develop threshold setting procedure
do a threshold curve for gain matched system
Bias Voltage
system for storing current values in a database (currently stored in EPICS (?), connection to CCDB?)
start with FIU bench-measurement values
measuring relative gains of SiPM as a function of bias voltage:
use tracking & PID to select minimum ionizing & attenuation correction
measure pedestal dependence on Bias Voltage
system for gain matching for SiPM:
bias voltage settable for individual detectors
develop gain matching procedure using bias voltage:
select common criteria for event selection (position, partilce type, momentum)
minimum ionizing
use mode 8 data sample data reguarly
develop algorithm for determining new bias values
Scalers
rates need to be in agreement with TDC/ADC rates
stand-alone GUI for reading values (exists already anything new needed?)
Measure discriminator threshold with flash & w/o flash align flash, TDC and scaler rates if all devices have common threshold the gain needs to be adjusted to align all check thresholds with flash wave form data
SiPM monitoring
design procedure for estimating photo-electrons per MeV (PID & tracking needed) system for storing results in a database
Efficiency Monitoring:
time resolution: monitor time resolution (internal time differences between detectors)
energy resolution: monitor standard dedx data
signal attenuation: determine attenuation parameters. Monitor parameter variation as a function of time/rate
efficiency: determine efficiency using tracking formation.
system for storing time resolution, attenuation parameters and efficiency parameters in CCCDB
Timing calibration
time-walk calibration: develop automatic procedure, monitor parameters signal shape characterization: regular sampling of signal shapes
Run preparations: establish standard procedure for data taking update online monitoring system review existing histograms suggest additions
Procedure during experiment: assess ST status: rates, efficiencies alarm handler: prepare actions according to various alarm handler events