| Article | |
| Report number | CERN-ACC-2016-0106 |
| Title | Beam screen cryogenic control improvements for the LHC run 2 |
| Author(s) | Bradu, Benjamin (CERN) ; Rogez, Edouard (CERN) ; Blanco Vinuela, Enrique (CERN) ; Ferlin, Gerard (CERN) ; Tovar-Gonzalez, Antonio (CERN) |
| Publication | 2017 |
| Imprint | 16 Aug 2016 |
| Number of pages | 9 |
| In: | IOP Conf. Ser. Mater. Sci. Eng. 171 (2017) 012128 |
| In: | 26th International Cryogenic Engineering Conference and International Cryogenic Materials Conference 2016, New Delhi, India, 7 - 11 Mar 2016, pp.012128 |
| DOI | 10.1088/1757-899X/171/1/012128 |
| Subject category | Accelerators and Storage Rings ; Accelerators and Storage Rings |
| Accelerator/Facility, Experiment | CERN LHC |
| Free keywords | CERN LHC, ; cryogenics, ; beam screens, ; feed-forward, ; controls, ; PLC |
| Abstract | 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. |
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Registre creat el 2016-08-16, darrera modificació el 2018-05-28
