Spacing effect of photonics tables

Introduction

Since EHE events are typically bright, we use a bit wider spacing for the photonics tables than the "standard" MC generation. This is beneficial for the memory usage and CPU time, though it might affect on our results. I checked this effect by simulating small sample with the "satandard" setting, and compare both results.

Settings

The spacings for the "standard" and "EHE optimized" MC generation are summerized such as below.

Since the table size becomes bigger (~2GB) when we use the "standard" tables, I had to divide the tables into three in zenith angle, and run simulation for each incident particle zenith angle, so less efficient.

I used same event samples (juliet MC) for this study to compare the different spacing tables.

Results

NPE ratio (standard/EHE)	NPE ratio (standard/EHE) with CoGZ cut red: CoGZ < -200 m green: -200 < CoGZ < 0 m blue: 0 < CoGZ < 200 m yellow: CoGZ > 200 m
NPE ratio (standard/EHE) Vs CoGZ	NPE ratio (standard/EHE) Vs Energy	NPE ratio (standard/EHE) Vs Zenith angle

Summary

• The resultant NPEs are a bit different by using different spacing tables.
• The spread of the difference is about 20%, but the mean value is same. This difference is within our understanding of ice property.