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arXiv · 2601.08090

Measurement of the LCLS-II dark current using the LDMX Trigger Scintillator Prototype

Elizabeth Berzin·Lene Kristian Bryngemark·Robert Craig Group·Joesph Kaminski·Timothy Nelson·Rory O'Dwyer·Jessica Pascadlo·Emrys Peets·Benjamin Reese·Lauren Tompkins·Kieran Wall·Andrew Whitbeck
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Abstract

The Light Dark Matter eXperiment (LDMX) is a proposed fixed-target missing momentum search for sub-GeV thermal relic dark matter. LDMX aims to probe thermal dark matter targets with 1016 electrons on target. Such an approach requires a high-repetition rate, low-current beam, with an average of one electron on target per event. These requirements are well-suited to the DArk Sector Experiments at LCLS-II (DASEL) facility, which will take advantage of the unused RF buckets between LCLS-II bunches to produce a well-defined low-current beam with a 26.9 ns bunch spacing. This document describes the results of a measurement of dark current in the Sector 30 transfer line (S30XL) of the LCLS-II beam, using a prototype of the LDMX trigger scintillator (TS) subsystem.

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Elizabeth Berzin, Lene Kristian Bryngemark, Robert Craig Group, Joesph Kaminski, Timothy Nelson, Rory O'Dwyer, Jessica Pascadlo, Emrys Peets, Benjamin Reese, Lauren Tompkins, Kieran Wall, Andrew Whitbeck. 2026-01-13. Measurement of the LCLS-II dark current using the LDMX Trigger Scintillator Prototype. https://doi.org/10.1016/j.nima.2026.171709

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