Speaker
Description
The Proton Improvement Plan-II (PIP-II) is a superconducting linear accelerator being built at Fermilab that will provide 800 MeV proton beam for neutrino production. The linac consists of a total of twenty three cryomodules of five different types. Cooling is required at 2 K, 5 K and 40 K. The Cryogenic Distribution System (CDS) consists of a Distribution Valve Box, ~285 m of cryogenic transfer line, modular Bayonet Cans to interface with cryomodules, and a Turnaround Can. The cryogenic system must provide protection from over-pressure by sizing pressure relief devices for all volumes and process line circuits. The cryomodule cavities have dual pressure ratings, 4.1 bara when cold and 2.05 bara when warm (T>80K) that impose unique challenges on the relief system. A relief system has been designed to meet these challenges in addition to satisfying functional requirements such as prohibition of venting relieved helium in the linac tunnel. This paper will provide a detailed description of the PIP-II CDS Pressure Safety system including the key relieving cases, methods for determining heat flux during a loss of vacuum, relief piping layout, and the selection of relief devices. Furthermore, vacuum vessel relief sizing to protect the CDS vacuum shells from over pressure during an internal line rupture will be presented.
This abstract has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.
