Thermal analysis of the LHC injection kicker magnets

8th International Particle Accelerator Conference

Vega, L.^1 ; Abánades, A.^2 ; Barnes, M.J.^1 ; Vlachodimitropoulos, V.^1 ; Weterings, W.^1

CERN-European Laboratory for Particle Physics, TE Division, Geneva 23

CH-1211, Switzerland^1

Departamento de Ingeniería Energetica, E.T.S. de Ingenieros Industriales, Universidad Politecnica de Madrid, Madrid, Spain^2

关键词: High intensity beam;    Induced heating;    Injector chains;    Kicker magnets;    Large Hadron collider LHC;    Low emissivities;    Pulsed magnets;    Thermal behaviours;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/874/1/012100/pdf
DOI  :  10.1088/1742-6596/874/1/012100

来源: IOP

【 摘 要 】

The CERN Large Hadron Collider LHC is equipped with two fast pulsed magnet systems (MKIs) that inject particle beams coming from the injector chain. Operation with high intensity beams for many hours can lead to significant beam induced heating of the ferrite yokes of the MKIs. When the ferrite exceeds the Curie temperature of 125°C it loses its magnetic properties, preventing further injection until the ferrite cools down, potentially causing a delay of several hours. Hence important upgrades of the beam-screen were implemented after Run 1 of LHC. However, the High-Luminosity (HL) LHC will be operated with significantly higher intensity beams and hence additional measures are required to limit the ferrite temperature. These magnets operate under ultra-high vacuum conditions: convection is negligible and, as a result of low emissivity of the inside of the vacuum tanks, thermal radiation is limited. A detailed study of the thermal behaviour of these magnets is reported and compared with measurements. In addition several options to improve cooling of the ferrites are presented and analysed.