Development of a compact ExB microchannel plate detector for beam imaging

TL;DR

This paper presents a compact ExB microchannel plate detector with a multi-strip anode and delay line readout, achieving a spatial resolution of approximately 413 micrometers FWHM for beam imaging, validated through experimental and simulation methods.

Contribution

It introduces a novel compact ExB MCP detector with enhanced spatial resolution and detailed performance assessment using experimental measurements and simulations.

Findings

Achieved a spatial resolution of 413 μm FWHM after signal processing.

Demonstrated the detector's capability for one-dimensional beam position measurement.

Validated the detector performance with ion-trajectory simulations.

Abstract

A beam imaging detector was developed by coupling a multi-strip anode with delay line readout to an E$\times$B microchannel plate (MCP) detector. This detector is capable of measuring the incident position of the beam particles in one-dimension. To assess the spatial resolution, the detector was illuminated by an $\alpha$-source with an intervening mask that consists of a series of precisely-machined slits. The measured spatial resolution was 520$\mu$m FWHM, which was improved to 413$\mu$m FWHM by performing an FFT of the signals, rejecting spurious signals on the delay line, and requiring a minimum signal amplitude. This measured spatial resolution of 413$\mu$m FWHM corresponds to an intrinsic resolution of 334$\mu$m FWHM when the effect of the finite slit width is de-convoluted. To understand the measured resolution, the performance of the detector is simulated with the ion-trajectory code SIMION.