W. Soyars, T. Banaszkiewicz, Ram Dhuley Fermilab, Wroclaw University of Science, Technology
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 (23) cryomodules of five (5) different types. Cooling is required at 2K, 5K and 40K. 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 cavity circuits have dual pressure ratings, 4.1 bara when cold and 2.05 bara when warm (T>80K). Worst case relieving cases will be identified. The methods for determining heat flux will be presented. For the relieving occurring in the linac tunnel, flow must vent to outside to avoid an oxygen deficiency hazard. Also, we will present vacuum vessel relief sizing to protect the cryogenic distribution system vacuum shells from over pressure during an internal line rupture. The project is funded by US DOE Offices of Science, High Energy Physics.
质子改进计划- ii (PIP-II)是在费米实验室建造的超导直线加速器，将提供800 MeV的质子束用于中微子的产生。直线加速器由五种不同类型的23个低温模块组成。在2K, 5K和40K时需要冷却。低温分配系统(CDS)由一个分配阀盒、约285米的低温传输线、与低温模块接口的模块化卡口罐和一个周转罐组成。低温系统必须通过为所有体积和工艺线路回路设置减压装置来防止过压。低温模腔电路具有双重额定压力，低温时为4.1 bara，高温时为2.05 bara(温度>80K)。将确定最坏情况的缓解情况。本文将介绍测定热流密度的方法。对于直线隧道内发生的泄放，气流必须排到室外，以避免缺氧的危险。此外，我们将介绍真空容器减压尺寸，以保护低温分配系统真空壳在内部管道破裂时免受过压。该项目由美国能源部科学、高能物理办公室资助。
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