Beam screen cryogenic control improvements for the LHC run 2

26th International Cryogenic Engineering Conference & International Cryogenic Materials Conference 2016

材料科学;物理学

Bradu, B.^1 ; Rogez, E.^1 ; Blanco-Viñuela, E.^1 ; Ferlin, G.^1 ; Tovar-Gonzalez, A.^1

European Organization for Nuclear Research (CERN), Geneva

23, Switzerland^1

关键词: Control improvements;    Control techniques;    Cryogenic control systems;    PID controllers;    Regulation loops;    Screen temperature;    Temperature range;    Temperature transients;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012128/pdf
DOI  :  10.1088/1757-899X/171/1/012128

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

This paper presents the improvements made on the cryogenic control system for the LHC beam screens. The regulation objective is to maintain an acceptable temperature range around 20 K which simultaneously ensures a good LHC beam vacuum and limits cryogenic heat loads. In total, through the 27 km of the LHC machine, there are 485 regulation loops affected by beam disturbances. Due to the increase of the LHC performance during Run 2, standard PID controllers cannot keeps the temperature transients of the beam screens within desired limits. Several alternative control techniques have been studied and validated using dynamic simulation and then deployed on the LHC cryogenic control system in 2015. The main contribution is the addition of a feed-forward control in order to compensate the beam effects on the beam screen temperature based on the main beam parameters of the machine in real time.