CEC-ICMC 2015 - Timetable, Abstracts and Presentations

Spallation Target Cryogenic Cooling Design Challenges at The European Spallation Source

30 Jun 2015, 16:45

15m

Tucson Ballroom GH

Contributed Oral Presentation CEC-02 - Large-Scale Systems, Facilities, and Testing C2OrG - Hydrogen and Other Systems

Speaker

John Jurns (European Spallation Source ESS AB)

Description

The European Spallation Source (ESS) project is a neutron spallation source research facility currently being designed and built outside of Lund, Sweden. A linear accelerator delivers a 5 MW, 2.0 GeV, 62.5 mA proton beam to a spallation target to generate fast neutrons. Supercritical hydrogen circulates through two moderators surrounding the target, and transforms the fast neutrons emitted into slow neutrons, which are the final form of useful radiation. The supercritical hydrogen is in turn cooled from a helium cryogenic plant operating at 17-20 K. The supercritical cryogenic hydrogen circuit is a dynamic system, subject to significant changes in heat load. Proper pressure control of this system is critical to assure safe operation. The interaction between the hydrogen system and helium cryoplant poses unique challenges. This paper will investigate the impact of the hydrogen system constraints on operation and control of the helium cryoplant, and suggest design options for the helium circuit.