Study on heat transfer between the High-Luminosity LHC beam screens and the He II-cooled beam tube. (April 2019)

• Record Type: Journal Article
• Authors: Borges de Sousa, P; Morrone, M; Garion, C; van Weelderen, R; Koettig, T; Bremer, J
• Is Part Of: IOP conference series. Volume 502(2019)
• Publication Date: 2019-04
• Subjects: Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/502/1/012088
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract: The new beam screens for the inner triplets in the HL-LHC are designed to intercept heat loads of up to 25 Wm −1 between 60 K and 80 K. The screens need to be mechanically supported by the beam tube at 1.9 K while limiting heat transfer to the same tube to less than 0.5 W m −1 . Measurements for the thermal validation of the beam screens were carried out on a dedicated test stand at the Central Cryogenic Laboratory at CERN. This paper describes the first measurement campaign of a full-scale D1-type beam screen mock-up: several parameters such as base temperature and heating power were varied, and results include heat transfer mechanisms within the beam screen and more importantly to the 1.9 K beam tube that forms the physical boundary between beam screen and He II-cooled magnets.