2D-Oide effect

TL;DR

This paper extends the understanding of the Oide effect by including both focusing and defocusing planes in the calculation, revealing a 17% increase in predicted beam size contribution for high-energy linear colliders.

Contribution

It introduces the 2D-Oide effect, a more comprehensive theoretical model that accounts for radiation effects in both planes of the quadrupole, improving accuracy over previous models.

Findings

2D-Oide increases beam size contribution by 17%.

Theoretical results agree with particle tracking simulations.

Insights suggest potential correction methods for the 2D-Oide effect.

Abstract

The Oide effect considers the synchrotron radiation in the final focusing quadrupole and it sets a lower limit on the vertical beam size at the Interaction Point, particularly relevant for high energy linear colliders. The theory of the Oide effect was derived considering only the radiation in the focusing plane of the magnet. This article addresses the theoretical calculation of the radiation effect on the beam size consider- ing both focusing and defocusing planes of the quadrupole, refered to as 2D-Oide. The CLIC 3 TeV final quadrupole (QD0) and beam parameters are used to compare the theoretical results from the Oide effect and the 2D-Oide effect with particle tracking in PLACET. The 2D-oide demonstrates to be important as it increases by 17% the contribution to the beam size. Further insight into the aberrations induced by the synchrotron radiation opens the possibility to partially correct the 2D-Oide effect with octupole magn