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arXiv · 2508.17991

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

Antonios Athanassiadis·Ties Behnke·Jonas Björklund Svensson·Oleksandr Borysov·Maryna Borysova·Lewis Boulton·Sarawit Chindaratchakul·Beate Heinemann·Louis Helary·Ruth Jacobs·Advait Kanekar·Jenny List·Tianyun Long·Tanguy Marsault·Felipe Peña·Stefan Schmitt·Sarah Schröder·Ivo Schulthess·Stephan Wesch·Matthew Wing·Jonathan Wood
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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 a typical precision on the order of 10% and an accuracy at the few-percent level. Additionally, it is capable of determining the beam's position with a precision on the order of tens of micrometers. Finally, we demonstrate applicability to high-energy photons.

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Antonios Athanassiadis, Ties Behnke, Jonas Björklund Svensson, Oleksandr Borysov, Maryna Borysova, Lewis Boulton, Sarawit Chindaratchakul, Beate Heinemann, Louis Helary, Ruth Jacobs, Advait Kanekar, Jenny List, Tianyun Long, Tanguy Marsault, Felipe Peña, Stefan Schmitt, Sarah Schröder, Ivo Schulthess, Stephan Wesch, Matthew Wing, Jonathan Wood. 2025-08-25. A dump leakage calorimeter to measure the flux of high-energy electrons and photons. https://doi.org/10.1088/1748-0221%2F21%2F07%2Fp07006

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