Circular Modes for Flat Beams in LHC

TL;DR

This paper explores the potential of using circular beam modes in the LHC to reduce space charge and beam-beam effects, proposing a novel approach to beam optics that could enhance collider performance.

Contribution

It introduces the concept of employing circular modes in injectors and transforming them into planar modes in the LHC, a novel method to mitigate beam limitations.

Findings

Circular modes can be effectively applied in LHC injectors.

Transformation from circular to planar modes reduces space charge effects.

Potential to significantly improve luminosity and beam stability.

Abstract

Typically x/y optical coupling is considered as unwanted and thus suppressed--particular exclusions are electron and ionization coolers. Could some special coupled modes be effectively applied for the LHC complex? Apparently, the answer is positive: use of the circular modes in the injectors with their transformation into planar modes in the LHC allows both the space charge and beam-beam luminosity limitations to be significantly reduced, if not practically eliminated.