Design of Pre-Dumping Ring Spin Rotator with a Possibility of Helicity Switching for Polarized Positrons at the ILC

TL;DR

This paper discusses the design of a spin rotator with helicity switching capabilities for polarized positrons at the ILC, aiming to improve polarization control during beam transport.

Contribution

It introduces a combined spin rotator/spin flipper design and presents lattice configurations developed at DESY for effective helicity switching.

Findings

Advantages of combined spin rotator/spin flipper discussed

Possible lattice designs for spin flipper presented

Helicity switching feasibility analyzed

Abstract

The use of polarized beams enhance the possibility of the precision measurements at the International Linear Collider (ILC). In order to preserve the degree of polarization during beam transport spin rotators are included in the current TDR ILC Lattice. In this report some advantages of using a combined spin rotator/spin flipper are discussed. A few possible lattice designs of spin flipper developed at DESY in 2012 are presented.