Analysis and Suppression of RF Radiation from the PSI 590MeV Cyclotron Flat Top Cavity

TL;DR

This paper models RF power leakage from the PSI 590MeV cyclotron's Flat Top Cavity, analyzes leakage mechanisms, and proposes methods to reduce power loss, informing future RF cavity designs for cyclotrons.

Contribution

It provides a detailed electromagnetic model of RF leakage and suggests design tolerances and methods to minimize power loss in cyclotron RF cavities.

Findings

Electromagnetic model accurately predicts RF leakage.

Identified key mechanisms causing power leakage.

Proposed methods can effectively reduce RF power loss.

Abstract

The Flat Top Cavity, located in the PSI HIPA Ring Cyclotron leaks RF power of several kilo Watts into the cyclotrons vacuum space causing several complications. A detailed electromagnetic model was created and simulations performed to analyze the mechanisms by which power is leaking out of the Flat Top Cavity. The tolerances needed to limit the leaked power in future iterations of the Flat Top cavity are reported. Comparison of the model to measurements are described as well as two potential methods to limit power leakage. These studies will have direct impact on future RF cavity designs for cyclotrons as power levels increase and higher RF fields are required.