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.
Highlights
The High-Luminosity Large Hadron Collider (HL-LHC) project aims to increase the performance of the LHC, increasing its luminosity by a factor of 10 beyond the design value [1]
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
The first measurement run consisted in a parametric study of a D1-type beam screen in which the base temperature was varied between 40 K and 80 K while the heat load applied on the tungsten blocks was varied between 0 and 20 W m−1
Summary
The High-Luminosity Large Hadron Collider (HL-LHC) project aims to increase the performance of the LHC, increasing its luminosity by a factor of 10 beyond the design value [1]. The beam screen flow conditioning circuit is composed of a heat exchanger (HEX) attached to the 1st stage of the PTR and a cold circulator (cryofan), and the cooling tubes (see figure 2).
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