Abstract
The European Spallation Source (ESS), currently under construction in Lund, Sweden, will be a neutron source based on a partly superconducting linac. The ESS linac will be accelerating protons to 2 GeV with a peak current of 62.5 mA and ultimately delivering a 5 MW beam to a rotating tungsten target for neutron production. For a successful tuning and operation of a linac, a beam loss monitoring (BLM) system is required. BLM systems are designed to protect the machine from beam-induced damage and unnecessary activation of the components. This paper focuses on one of the BLM systems to be deployed at the ESS linac, namely the neutron sensitive BLM (nBLM). An overview of the ESS nBLM system design will be presented. In addition to this, results of the tests performed with the full nBLM data acquisition chain will be discussed. These tests represent the first evaluation of the system prototype in a realistic environment. They served as an input to initial study of the procedure for neutron detection algorithm configuration discussed in this contribution as well.
Highlights
The European Spallation Source (ESS) will be a material science research facility, which is currently being built in Lund, Sweden
Following the goal of neutron sensitive BLM (nBLM) system as the primary loss monitor in the NC parts of the ESS linac, the majority of detectors will be placed in the drift tube linac (DTL) section (Fig. 1)
Detectors will be positioned at every ∼1=4 of a DTL tank length (∼1 m), resulting in 8 detectors per each of the five DTL tanks and a pair at the end of the DTL section. This placement selection was determined through Monte Carlo simulation campaign of lost protons for a set of localized beam loss scenarios differing in beam parameters and locations along the DTL section
Summary
The European Spallation Source (ESS) will be a material science research facility, which is currently being built in Lund, Sweden Once constructed, it will provide neutron beams for neutron-based research [1,2]. Beam loss monitoring (BLM) systems are designed to provide information about beam loss levels They play an important role in machine fine-tuning as well as machine protection from beam-induced damage by detecting unacceptably high beam losses and promptly inhibiting beam production. The ionization chamber-based BLM (ICBLM) system consists of 266 ionization chambers located almost exclusively throughout the SC parts of the linac [3] This contribution aims to report an overview of the ESS nBLM system design. Results of the tests performed with the first prototype in realistic environment are presented together with the initial analysis of the procedure to configure the neutron detection algorithm
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