HB2025 - the 71st ICFA Advanced Beam Dynamics workshop on High-Intensity and High-Brightness Hadron Beams

Update on ESS icBLM system testing

THCBB03

Oct 23, 2025, 11:50 AM

20m

room B (conference center)

Contributed Oral Presentation WGE: Beam Instrumentation, beam Interaction and AI technology THCBB WGE contributed oral

Speaker

Viatcheslav Grishin (European Spallation Source)

Description

The European Spallation Source (ESS) in Lund, Sweden, is a pulsed neutron source based on a proton linac. The ESS linac is designed to deliver a 2 GeV beam with a peak current of 62.5 mA at 14 Hz to a rotating tungsten target for neutron production.
One of the most critical elements for protection of the accelerator is a beam loss monitoring (BLM) system. The system is designed to protect the accelerator from beam-induced damage and an unnecessary activation of the components.
The main ESS BLM system is based on ionisation chamber (icBLM) detectors. In the whole ESS linac, the total of 266 chambers were installed, connected, and powered. This contribution results from acceptance, installation and measurement campaigns made by several teams for the readiness of commissioning the BLM system with the beam, namely by the ESS beam diagnostics and integration groups, Warsaw University of Technology. Several tests were performed, in particular leakage current tests at CERN and ESS, installation and other resolved issues; self-integration, data acquisition, high voltage, Xray tests of the whole chain of icBLM system, and calibration test at HiRadMat facility at CERN.