Study of neutron shielding collimators for curved beamlines at the European Spallation Source

V. Santoro, D. D. Dijulio, S. Ansell, N. Cherkashyna, G. Muhrer, P. M. Bentley

Forskningsoutput: Kapitel i bok/rapport/Conference proceedingKonferenspaper i proceedingPeer review

Sammanfattning

The European Spallation Source is being constructed in Lund, Sweden and is planned to be the world's brightest pulsed spallation neutron source for cold and thermal neutron beams (≤ 1 eV). The facility uses a 2 GeV proton beam to produce neutrons from a tungsten target. The neutrons are then moderated in a moderator assembly consisting of both liquid hydrogen and water compartments. Surrounding the moderator are 22 beamports, which view the moderator's outside surfaces. The beamports are connected to long neutron guides that transport the moderated neutrons to the sample position via reflections. As well as the desired moderated neutrons, fast neutrons coming directly from the target can find their way down the beamlines. These can create unwanted sources of background for the instruments. To mitigate such a kind of background, several instruments will use curved guides to lose direct line-of-sight (LoS) to the moderator and the target. In addition instruments can also use shielding collimators to reduce the amount of fast neutrons further traveling down the guide due to albedo reflections or streaming. Several different materials have been proposed for this purpose. We present the results of a study of different options for collimators and identify the optimal choices that balance cost, background and activation levels.

Originalspråkengelska
Titel på värdpublikationJournal of Physics: Conference Series
Volym1046
Utgåva1
DOI
StatusPublished - 2018 juni 12
Evenemang4th International Workshop on Accelerator Radiation Induced Activation, ARIA 2017 - Lund, Sverige
Varaktighet: 2017 maj 222017 maj 24

Publikationsserier

NamnJournal of Physics: Conference Series
FörlagIOP Publishing
ISSN (tryckt)1742-6588

Konferens

Konferens4th International Workshop on Accelerator Radiation Induced Activation, ARIA 2017
Land/TerritoriumSverige
OrtLund
Period2017/05/222017/05/24

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