1. Time calibration
Dmitry Chirkin, LBNL
UC Berkeley, November 2004

2. Tcal algorithm
find:
DOM time of tcal
delta=tDOR-tDOM

3. IceCube/2004/09/15/UWDAQ1_run0002141_TimeResolution-ATWD0
Dataset
laser run:
1.5 kHz
75 ps wide
attenuated by beam splitters: optical occupancy set at 0.1
46*2+1+1 DOMS:
1 SYNC board connected to laser (here: DOM 37) 175 ns early
1 REF PMT (room T) (here: DOM 62)
(info by Kael Hanson)
files from:
IceCube/2004/09/15/UWDAQ1_run _TimeResolution-ATWD0

4. Time calibration

5. Roundtrip time

6. p0+A0 exp(-(t-t0)/s0)(1-exp(-(t-t0)2/s02))
Feature Extraction
p0+A0 exp(-(t-t0)/s0)(1-exp(-(t-t0)2/s02))

7. Feature Extraction (laser pulse)
A0 exp(-(t-t0)/d0)(1-tanh(-(t-t0)/s0))

8. Laser-correlated signal

9. Noise and hit quality cleaning

10. Calibration frame in dataclasses
Dmitry Chirkin, Tom McCauley, LBNL
UC Berkeley, November 2004

11. Calibration ER diagram (example?)
From Dave Glowacki

12. Calibration functionality
configuration
channel width = (BIAS*slope+intercept)*20 [ns]

13. Proposed calibration structure
I3Calibration
I3IceTopCalibration
I3InIceCalibration
map<OMKey, >
I3DOMCalibration
Linear fit to ATWD voltage vs. count (ATWD id)(channel)(bin):
slope [V]
intercept [V/count]
regression-coefficient
Channel gain (channel)
Pedestal voltage [V]
PMT high voltage [V]
1/ATWD sample rate (ATWD id) [ns]
GetATWDVoltage
(id, channel, bin, count)
GetHighVoltage() …
GetATWDGain(channel)
GetPedestalVoltage()

14. Higher-level calibration info

15. Conclusions Calibration frame was added to dataclasses
Basic (required at this moment) functionality was added
Development of modules ATWDChannelMerger and FeatureExtractor is no longer stalled
Higher-level calibration functionality to be implemented as part of the I3DOMCalibration:
slope and intercept of the t0 vs. waveform width correlation
slope and intercept of the t0 vs. PMT high voltage correlation
PMT gain (1 pe. peak location in pC)

16. Reader for Madison FAT data
Dmitry Chirkin, LBNL
UC Berkeley, November 2004

17. Reader functionality

18. Processing specifics

19. fat-reader module as of 11/11/04: cvs co fat-reader
cvs co phys-services
cvs co dataclasses
I3FATReader::Configure()
reads configuration and all calibration
I3FATSource::Configure()
fills I3DOMCalibration structures
I3FATReader::Physics()
adds next (time-calibrated and
time-sorted) hit event
Contains:
I3FATReader.{cxx,h}
I3FATSource.{cxx,h}
reader.{cxx,h}
tcalfit.{cxx,h}
resources/TestReader.C

20. Conclusions
fat-reader is available as both I3 module or stand-alone application:
via cvs co fat-reader
from
Configuration and all calibration files are read at initialization;
I3DOMCalibration structures are filled
Hit events are added to the Frame by I3FATReader::Physics()
Example data directory is placed on glacier, try to run there:
root –b fat-reader/resources/TestReader.C