Magnetic Measurements at Warm of the First FCC-ee Final Focus Quadrupole Prototype

TL;DR

This paper reports on the design, manufacturing, and warm testing of the first FCC-ee final focus quadrupole prototype, demonstrating excellent field quality and innovative measurement techniques.

Contribution

It introduces a novel measurement technique and compares two magnet edge designs, advancing quadrupole magnet development for particle accelerators.

Findings

Successful warm testing of the prototype with high field quality

Effective method to distinguish environmental distortions from magnet effects

Comparison of local multipole cancellation and conventional design edges

Abstract

The first FCC-ee final focus quadrupole prototype has been designed, manufactured, assembled and tested at warm. The prototype is a single aperture quadrupole magnet of the CCT type. One edge of the magnet was designed with local multipole cancellation, whereas the other was left with the conventional design. An optimized rotating induction-coil sensor was used. A technique was developed to take into account field distortions due to the environment of the test and distinguish them from magnet effects, demonstrating an excellent field quality for the prototype.