Strap-on magnets: a framework for rapid prototyping of magnets and beam lines

TL;DR

This paper introduces a flexible framework for rapidly prototyping various magnet types and beam-line modules using 3D-printed frames and permanent magnets, with analytically calculable fields.

Contribution

It presents a novel modular approach for constructing and adjusting magnets and beam-line components with analytically predictable magnetic fields.

Findings

Magnetic fields can be accurately calculated analytically.

Rotating magnets adjusts their integrated strength.

Constructed modules include chicane, triplet, and solenoid systems.

Abstract

We describe a framework to assemble permanent-magnet cubes in 3D-printed frames to construct dipole, quadrupole, and solenoid magnets, whose field, in the absence of iron, can be calculated analytically in three spatial dimensions. Rotating closely spaced dipoles and quadrupoles in opposite directions allows us to adjust the integrated strength of a multipole. Contributions of unwanted harmonics are calculated and found to be moderate. We then combine multiple magnets to construct beam-line modules: chicane, triplet cell, and solenoid focusing system.