ATWD gain

Introduction

There are some study indicating gain calibration between ATWD gains are not correctly done (done by J. Kelly et al.). I have also checked the correlation of amplitude and npe between ch0/ch1 and ch1/ch2 by using IC-22 EHE data.

Procedure

We currently calibrate waveforms that are not saturated for a ATWD gain (calibration mode 1 in DOMcalibrator). For this study, I calibrated raw waveform for each gain by using calibration mode 2 in DOMcalibrator.

Results

Amplitude comparison

It turend out there are no multiple waveforms for each gain unles the waveform is not saturated with the high gain such as ch0.

ch0/ch1 logarithmic scale	ch1/ch2 logarithmic scale
ch0/ch1 linear scale	ch1/ch2 linear scale

Channel-wise Npe comparison

Althogh the waveforms are saturated, it seems to me that the npe correlation between ATWD channel seems to be fine for not so much saturated part.

ch0/ch1 logarithmic scale	ch1/ch2 logarithmic scale Strange cluster at 300 npe in ch2... need to be checked.
ch0/ch1 linear scale	ch1/ch2 linear scale