Conception and design of a cooling system for the LHC injection kicker magnets

L Vega Cid,A Abánades,M.J Barnes,F Mostchmann,V Vlachodimitropoulos,W Weterings

doi:10.1016/j.nima.2018.11.007

Abstract

The CERN Large Hadron Collider is equipped with two fast single-turn injection kicker systems that deflect the incoming particle beam onto the accelerator’s orbit. The high intensity LHC beam, circulating for many hours, can cause considerable heating of the injection kicker magnets. Numerical models have been developed and validated to study the beam induced heating and thermal behaviour of these magnets. The models are used to predict the power deposition and temperatures for various operation scenarios. According to predictions, heating issues are expected for High Luminosity LHC operation with high intensity beams unless appropriate measures are taken. Cooling of the magnet yokes is complicated as the magnets are in vacuum and are pulsed at high voltage. A description of the evolution of the studies is presented, culminating with the conception and design of a cooling system which is thoroughly described, from the conception process to the final proposed solution.

Highlights

At CERN, the European Organization for Nuclear Research, particle accelerators and detectors are used to study the basic constituents of matter
Various concepts have been studied for redistributing the beam induced power deposition and removing heat from the ferrite yokes of the MKI kicker magnets
The best option is to use a suitably designed ferrite cylinder to provide RF damping, and to cool the ferrite cylinder by installing a water cooled copper cylinder brazed around the ferrite cylinder

Summary

Introduction

At CERN, the European Organization for Nuclear Research, particle accelerators and detectors are used to study the basic constituents of matter. The flagship accelerator of CERN is the Large Hadron Collider (LHC), in which two high-energy particle beams are accelerated close to the speed of light before they are made to collide in four points, where the detectors are located, to analyse the products of the collisions. Following periods of operation (Runs), the LHC is stopped during Long Shutdowns (LS) and Year End Technical Stops (YETS) for upgrades. The major upgrade is for the High Luminosity LHC (HL-LHC). The project described in this article is within the context of the upgrades towards the HL-LHC operation and the LHC Injection Kicker Magnets (MKIs) are the object of study

Objectives

Methods

Results

Conclusion