Operational experience of the upgraded LHC injection kicker magnets during Run 2 and future plans

8th International Particle Accelerator Conference

Barnes, M.J.^1 ; Adraktas, A.^1 ; Bregliozzi, G.^1 ; Goddard, B.^1 ; Ducimetière, L.^1 ; Salvant, B.^1 ; Sestak, J.^1 ; Vega Cid, L.^1 ; Weterings, W.^1 ; Yin Vallgren, C.^1

CERN, Geneva, Switzerland^1

关键词: Beam coupling;    Bunch length;    Electrical breakdown;    First year;    Induced heating;    Kicker magnets;    Operational experience;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/874/1/012101/pdf
DOI  :  10.1088/1742-6596/874/1/012101

来源: IOP

【 摘 要 】

During Run 1 of the LHC, one of the injection kicker magnets caused occasional operational delays due to beam induced heating with high bunch intensity and short bunch lengths. In addition, there were also sporadic issues with vacuum activity and electrical flashover of the injection kickers. An extensive program of studies was launched and significant upgrades were carried out during Long Shutdown 1 (LS 1). These upgrades included a new design of beam screen to reduce both beam coupling impedance of the kicker magnet and the electric field associated with the screen conductors, hence decreasing the probability of electrical breakdown in this region. This paper presents operational experience of the injection kicker magnets during the first years of Run 2 of the LHC, including a discussion of faults and kicker magnet issues that limited LHC operation. In addition, in light of these issues, plans for further upgrades are briefly discussed.