Study on heat transfer between the High-Luminosity LHC beam screens and the He II-cooled beam tube

27th International Cryogenics Engineering Conference and International Cryogenic Materials Conference 2018

Borges De Sousa, P.^1 ; Morrone, M.^1 ; Garion, C.^1 ; Van Weelderen, R.^1 ; Koettig, T.^1 ; Bremer, J.^1

CERN, Geneva

CH-1211, Switzerland^1

关键词: Base temperature;    Beam tubes;    Heat transfer mechanism;    Heating power;    Measurement campaign;    Test stands;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/502/1/012088/pdf
DOI  :  10.1088/1757-899X/502/1/012088

来源: IOP

【 摘 要 】

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.Published under licence by IOP Publishing Ltd.