ATWD channel ratio

Introduction

There are some study indicating gain calibration between ATWD gains are not correctly done (done by J. Kelly et al.). In ordert to evaluate the effect from ATWD ch2, I checked the ratio of total Npe contributed from ATWD ch2 to the (best estimated) total Npe.

data set

I uesed one mouth data of EHE filtered IC-22 data (August).

Results

ATWD channel ratio Vs Npe

ATWD channel ratio Vs Npe black: ch0, blue: ch1, red: ch2

ATWD channel ratio Vs Npe (profile) black: ch0, blue: ch1, red: ch2

ATWD channel ratio Vs Npe (CoGR < 300m)

ATWD channel ratio Vs Npe (CoGR < 300m) black: ch0, blue: ch1, red: ch2

ATWD channel ratio Vs Npe (profile) (CoGR < 300m) black: ch0, blue: ch1, red: ch2

ATWD channel ratio Vs CoGZ

ATWD channel ratio Vs CoGZ black: ch0, blue: ch1, red: ch2

ATWD channel ratio Vs CoGZ black: ch0, blue: ch1, red: ch2

ATWD channel ratio Vs CoGZ (total Npe>10^4)

ATWD channel ratio Vs CoGZ (total Npe>10^4) black: ch0, blue: ch1, red: ch2

ATWD channel ratio Vs CoGZ (total Npe>10^4) black: ch0, blue: ch1, red: ch2

ATWD channel ratio Vs CoGR

ATWD channel ratio Vs CoGR black: ch0, blue: ch1, red: ch2

ATWD channel ratio Vs CoGR black: ch0, blue: ch1, red: ch2

ATWD channel ratio Vs CoGX

ATWD channel ratio Vs CoGX black: ch0, blue: ch1, red: ch2

ATWD channel ratio Vs CoGX black: ch0, blue: ch1, red: ch2

ATWD channel ratio Vs CoGY

ATWD channel ratio Vs CoGY black: ch0, blue: ch1, red: ch2

ATWD channel ratio Vs CoGY black: ch0, blue: ch1, red: ch2

Summary

• The contribution of ATWD ch2 for the best estimated total Npe is roughly 40 % on average, though there is quite large spread. (a bit smaller for high total Npe.)
• The contribution of ATWD ch2 slightly depends on the total Npe.
• There is no strong distance dependence from the center of the detector.
• The contribution of ATWD ch2 is larger for events whose CoG is near top or deep ice.