Preparation of an emittance transfer experiment

TL;DR

This paper details the preparation and simulation of an experiment to create flat hadron beams with unequal emittances, including error analysis and hardware development for beam transformation.

Contribution

It presents the first systematic approach to generate flat hadron beams and demonstrates the experimental setup, simulations, and error analysis for emittance transfer.

Findings

Successful simulation of charge state stripping in a solenoid

Benchmarking of matrix formalism with magnetic field maps

Error analysis shows robustness of the beam transformation setup

Abstract

Flat beams feature unequal emittances in the horizontal and vertical phase space. Those beams were created successfully in lepton machines. Although a number of applications will profit also from flat hadron beams, to our knowledge they have never been created systematically. Multi-turn injection schemes, spectrometers, and colliders will directly benefit from those beams. The present paper covers the preparation of the experimental proof of principle for flat hadron beam creation in a beam transport section. Detailed simulations of the experiment, based on charge state stripping inside of a solenoid [L. Groening, Phys. Rev. ST Accel. Beams 14, 064201 (2011)], are performed. The matrix formalism was benchmarked with tracking through three-dimensional magnetic field maps of solenoids. An error analysis targeting at investigation of the impact of machine errors on the round-to-flat beam transformation has been performed. The remarkable flexibility of the set-up w.r.t. decoupling is addressed, as it can provide an one-knob tool to set the horizontal and vertical emittance partitioning. Finally, the status of hardware design and production is given.