4.7: Report on the conception design of the ESS and the BRR test beamline

At the European Spallation Source (ESS), beams of neutrons will be generated by accelerating protons and directing them at a target made of tungsten. The high-energy neutrons resulting from the collisions are slowed down by the moderators, then extracted through the beam lines and guided to the instruments. One of the crucial components and a most innovative development in enhancing the neutron source brightness is the compact cryogenic moderator (CCM; also called: Low Dimension Moderator or LDM). Its principle was recently invented by the ESS target team during the design phase of ESS. This very new idea and its technical solutions need complex simulation and experimental verification at various conditions. The Wigner Research Centre, as a partner in BrightnESS Work Package 4, provides valuable contributions to task 4.5 through the experience gained in the construction and operation of a similarly innovative cold neutron source at the Budapest Neutron Centre (BNC). BNC operates a cold neutron research facility which includes a liquid hydrogen moderator inserted horizontally into the reactor core, a supermirror neutron guide system and a suit of 8 experimental stations placed in a neutron guide hall.

DOI: https://doi.org/10.17199/BRIGHTNESS.D4.7