Abstract

Proton beams will be injected into LHC at 450 GeV by two kicker magnet systems, producing magnetic field pulses of approximately 900 ns rise time and up to 7.86 /spl mu/s flat top duration. One of the stringent design requirements of these systems is a flat top ripple of less than /spl plusmn/0.5%. Both injection systems are composed of 4 traveling wave kicker magnets of 2.7 m length each, powered by pulse forming networks (PFN's). To achieve the required kick strength of 1.2 Tm, a low characteristic impedance has been chosen and ceramic plate capacitors are used to obtain 5 /spl Omega/. Conductive stripes in the aperture of the magnets limit the beam impedance and screen the ferrite. The electrical circuit has been designed with the help of PSpice computer modeling. A full size magnet prototype has been built and tested up to 60 kV with the magnet under ultra high vacuum (UHV). The pulse shape has been precision measured at a voltage of 15 kV. After reviewing the performance requirements the paper presents the magnet design, emphasizing several novel design features, and discusses the test results.

Highlights

  • CERN, the European Laboratory for Particle Physics, is constructing the Large Hadron Collider (LHC), which will bring protons into head-on collisions at an energy of 14 TeV, and heavy ions at 1148 TeV.The LHC will be located in the 27 km long tunnel that previously housed the Large Electron Positron Collider (LEP), and be filled at 450 GeV through a chain of injector machines

  • A large and relatively strong fast pulsed magnet has been designed for the LHC injection and constructed for its specific requirements

  • The mechanical design has been complicated by the need to bake-out the full magnet due to the ceramic capacitors

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Summary

INTRODUCTION

CERN, the European Laboratory for Particle Physics, is constructing the Large Hadron Collider (LHC), which will bring protons into head-on collisions at an energy of 14 TeV, and heavy ions at 1148 TeV. Each beam channel will be filled by 12 batches of protons from the Super Proton Synchrotron (SPS), injected successively along the machine circumference from a dedicated injection point. Injection is carried out in the horizontal plane by means of a septum magnet followed by a vertical fast pulsed kicker system. The beam to be injected approaches the kicker system at an angle of 0.8 mrad, requiring a total kick strength of 1.2 Tm for deflection onto the central machine orbit. The system is composed of a multi-cell PFN and a multi-cell travelling wave kicker magnet, connected by a matched transmission line and terminated by a matched resistor. The design voltage is 60 kV, as in most SPS kicker installations, allowing the use of several proven components such as transmission line, connectors and termination resistors. The voltage on the magnet is half of the PFN voltage: allowing for overshoot, the design voltage of the magnet is 35 kV

Design strategy
Findings
CONCLUSIONS
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