A dump leakage calorimeter to measure the flux of high-energy electrons and photons

TL;DR

This paper introduces a lead glass calorimeter that measures high-energy electron and photon fluxes by detecting electromagnetic shower leakage, providing precise charge and position measurements at the FLASHForward experiment.

Contribution

The paper presents a novel calorimeter design that effectively measures high-energy particle fluxes and beam parameters with high precision, demonstrating its applicability to electron and photon detection.

Findings

Achieved 10% charge measurement precision

Achieved 3% charge measurement accuracy

Beam position determined within tens of micrometers

Abstract

We developed a novel apparatus based on a lead glass calorimeter that can measure the flux of high-energy electrons or photons. Our detector uses the electromagnetic shower leakage from the beam dump, where the particles are disposed of at the beamline's end. A prototype of such a calorimeter was set up at the FLASHForward experiment at DESY. We show that it can measure the electron bunch charge with precision and accuracy at the 10% and 3% level, respectively. Additionally, it is capable of determining the beam's position with a precision on the order of tens of micrometers. Finally, we show the applicability to the measurement of high-energy photons.