Rotating system for four-dimensional transverse rms-emittance measurements

TL;DR

This paper presents the development and successful commissioning of ROSE, a rotating system designed to measure the full four-dimensional transverse rms beam parameters, including inter-plane correlations, at GSI's high charge injector.

Contribution

The paper introduces a novel rotating measurement system (ROSE) for complete four-dimensional beam rms-parameter determination, including inter-plane correlations, which was successfully tested with ion beams at GSI.

Findings

Successfully measured 4D beam matrix at GSI

Demonstrated removal of inter-plane correlations

Validated mathematical algorithms for 4D emittance analysis

Abstract

Knowledge of the transverse four-dimensional beam rms-parameters is essential for applications that involve lattice elements that couple the two transverse degrees of freedom (planes). Of special interest is the removal of inter-plane correlations to reduce the projected emittances. A dedicated ROtating System for Emittance measurements (ROSE) has been proposed, developed, and successfully commissioned to fully determine the four-dimensional beam matrix. This device has been used at the High Charge injector (HLI) at GSI using a beam line which is composed of a skew quadrupole triplet, a normal quadrupole doublet, and ROSE. Mathematical algorithms, measurements, and results for ion beams of 83Kr13+ at 1.4 MeV/u are reported in this paper.