At the International Linear Collider (ILC), measurement of the beam profile at the interaction point (IP) is a key issue to achieve high luminosity. We studied the beam size measurement by combination of Pair Monitor and BeamCal. We obtained measurement accuracies of 2.7%, and 6.6% for the horizontal, and vertical beam sizes, respectively, for 50 bunch crossings.
@article{arxiv.0901.4446,
title = {Beam Size Measurement with Pair Monitor and BeamCal},
author = {Kazutoshi Ito and Akiya Miyamoto and Tadashi Nagamine and Yutaro Sato and Yosuke Takubo and Toshiaki Tauchi and Hitoshi Yamamoto},
journal= {arXiv preprint arXiv:0901.4446},
year = {2009}
}