Revision as of 15:49, 4 November 2015

Overview

We propose to run a "Calibration Challenge" starting the first week of December 2015.

The goal will be to take a run with zeroed out calibrations and to see how many calibrations can be automatically extracted.

Test runs will be performed in the weeks leading up to this challenge.

Types of Tests

Various types of tests could be run to exercise our calibration procedures.

1. Calibration values are normalized to some neutral value (e.g. 1 or 0), and the calibrations are derived "ab initio".
   • Given the diversity of run conditions among the few production runs in the spring data, it makes sense to do this test with just one run at a time, and not combine runs. Therefore, we can test calibrations that only need ~1 runs' worth of data.
2. Current calibration values are perturbed by some amount, and procedures are run to see how well the current values are recovered.
   • The perturbations would be specific to each calibration. Different functional forms? Gaussian? Square wave?
   • This would give us a way of testing calibrations that require more than one run's worth of data to be done from an uncalibrated state.

Types of Data

References:

• Automated Timing Calibrations
• Spring 2015 Dataset Summary

The largest spring production run is 2931, so that would be a good choice. It has the following charateristics:

• 50um diamond radiator
• 800A solenoid current

In principle, simulations could be used as well. Some effort is needed to work on the software to support this.

Calibration Classes

We can classify the calibrations by the type and amount of data needed. Only tables that have well-defined procedures have been included.

One Run Photon Beam Data

• All/base_time_offets
• CDC/timing_offsets
• FCAL/timing_offsets
• START_COUNTER/adc_timing_offsets
• START_COUNTER/tdc_timing_offsets
• START_COUNTER/timewalk_parms
• TOF/adc_timing_offsets
• TOF/tdc_timing_offsets
• TOF/...
• BCAL/TDC_offsets
• BCAL/ADC_timing_offsets
• BCAL/timewalk_tdc
• PHOTON_BEAM/RF/time_offset
• PHOTON_BEAM/RF/time_offset_var
• PHOTON_BEAM/RF/time_resolution_sq
• PHOTON_BEAM/hodoscope/fadc_time_offsets
• PHOTON_BEAM/hodoscope/tdc_time_offsets
• PHOTON_BEAM/microscope/fadc_time_offsets
• PHOTON_BEAM/microscope/tdc_time_offsets
• PHOTON_BEAM/pair_spectrometer/coarse/fadc_time_offsets
• PHOTON_BEAM/pair_spectrometer/coarse/tdc_time_offsets
• PHOTON_BEAM/pair_spectrometer/fine/fadc_time_offsets
• BCAL gain ratios
• BCAL/attenutation_parms

Future:

• Most basic FDC calibrations?

Multiple Run Photon Beam Data

• BCAL/ADC_gains
• FCAL/gains
• START_COUNTER/attenuation_factors
• START_COUNTER/propogation_speeds

Future:

• CDC/wire_aligment ?

Cosmic Data

• BCAL/effective_velocities?
• CDC/cdc_drift
• CDC/wire_aligment
• CDC/sag_parameters
• CDC/drift_parameters

• magnetic field dependence? other tracking corrections?

Plugin Requirements

Calibration plugins should satisfy the following guidelines:

1. Uses a DANA plugin to process the EVIO files
2. ROOT/text files are the preferred intermediate file format
3. The final output is a text file that can be used as an input to CCDB
4. Contains ROOT scripts to make plots that monitor/verifies the outputs
5. The outputs and execution steps are documented

If your plugin does not satisfy these, then please discuss the situation with the Calibration Coordinator (Sean), and we will develop a plan of action.

Challenge Type 1

We will focus on calibrations that can be fully done with one run's worth of beam data, ignoring calibrations that are best performed with cosmic data.

The following plugins will be used:

• BCAL_attenlength_gainratio
• BCAL_TDC_Timing
• HLDetectorTiming
• PSC_TW
• RF_online
• PS energies [upcoming] (Alex B.)
• SC timewalk [upcoming] (Mahmoud K.)
• TAGH timewalk [upcoming] (Nathan S.)
• TAGM timewalk [upcoming] (Alex B.)

Run Plan

Question: implied validation step after each pass, or work in explicit validation steps at certain points?

Pass 0

Plugins: RF_online

Number of events: 50k

hd_root options: None

Pass 1

Plugins: RF_online

Number of events: 50k

hd_root options: None

Pass 1

Plugins: HLDetectorTiming (rough timing)

Number of events:

hd_root options:

Pass 2

Plugins: HLDetectorTiming (ADC/TDC alignment)

Number of events:

hd_root options:

Pass 3

Plugins: HLDetectorTiming (per-channel alignment)

Number of events:

hd_root options:

Pass 4

Plugins: timewalk corrections

Number of events:

hd_root options: