4.10: Test for technology demonstrator

The organization of BrightnESS Work Package 4 task 4.3 relies on the interaction between the European Spallation Source ERIC (ESS) and the Institut Lauve-Langevin (ILL) detector teams to make the best Multi-Grid technology [1-8] available for the ESS instruments at the first day of operation. Two approaches are considered in this task: on one side, ESS is focusing on the simulation, design, construction and characterization of a demonstrator detector containing detection elements, called grids, similar to the IN5 Grid developed previously in the CRISP project. This baseline, described in the BrightnESS D4.5 deliverable, ensures production feasibility and predictable operation of the detectors for the ESS instruments at Day-1. On the other side, the development carried out at ILL is mainly focused on the study of a new grid, called RAMSES Grid, with the aim of:
1. reducing the dead zones of the detector, and
2. improving the intrinsic detection efficiency.
ILL and ESS developed a 3 m long 8-columns prototype, called the IN5_Prototype, before the BrightnESS project. The walls used to reinforce the structure of the vessel limited its global efficiency. The weight of one module, 700 kg, a factor of around 2 higher than IN5, also represents a severe drawback for the integration into an instrument. Most of the Time-of-Flight (TOF) instruments of ESS are planned to operate in vacuum. The new approach studied in the BrightnESS project, is to reduce significantly the requirements on the mechanical strength on the detector vessel in order to reduce the need of reinforcement walls, by operating the detector at low gas pressure.

DOI: https://doi.org/10.17199/BRIGHTNESS.D4.10