Study and improvements of a radially coupled coaxial Fast Faraday cup design towards lower intensity beams

TL;DR

This paper presents modifications to a radially-coupled coaxial Fast Faraday cup design to improve its performance for lower intensity ion beams, including simulation analysis and strategies to reduce profile distortions.

Contribution

It introduces a modified design of the Fast Faraday cup tailored for lower intensity beams and evaluates its performance through simulations and distortion mitigation strategies.

Findings

Design modifications improve signal detection for low-intensity beams

Simulations show effective avoidance of field dilution

Strategies reduce secondary electron emission effects

Abstract

A radially-coupled coaxial fast Faraday cup design was presented in [1] for high-intensity non-relativistic proton beams. In this work, we discuss a modification of that design in the context of a relatively lower intensity ion beam for longitudinal charge profile measurements. Particle-in-cell and time domain electromagnetic simulations of the new design with a focus on avoiding field dilution while generating enough signal for relatively lower intensity ion beams at the upcoming High Current Injector Programme at IUAC, New Delhi [2,3] is discussed. Profile distortions from secondary electron emission are estimated and strategies to suppress them are discussed.