NDLI: An improved beam screen for the lhc injection kickers

Content Provider	IEEE Xplore Digital Library
Author	Barnes, M.J. Caspers, F. Ducimetiere, L. Garrel, N. Kroyer, T.
Copyright Year	2007
Description	Author affiliation: CERN, Geneva (Barnes, M.J.; Caspers, F.; Ducimetiere, L.; Garrel, N.; Kroyer, T.)
Abstract	The two LHC injection kicker magnet systems must produce a kick of 1.3 T.m with a flattop duration variable up to 7860 ns, and rise and fall times of less than 900 ns and 3000 ns, respectively. Each system is composed of two resonant charging power supplies (RCPSs) and four 5 Omega transmission line kicker magnets with matched terminating resistors and pulse forming networks (PFNs). A beam screen is placed in the aperture of the magnets: the screen consists of a ceramic tube with conductors on the inner wall. The conductors provide a path for the image current of the, high intensity,LHC beam and screen the ferrite against Wake fields. The conductors initially used gave adequately low beam coupling impedance however inter-conductor discharges occurred during pulsing of the magnet: an alternative design was discharge free at the nominal operating voltage but the impedance was too high for the ultimate LHC beam. This paper presents the results of a new development undertaken to meet the often conflicting requirements for low beam coupling impedance, fast magnetic field rise- time and good high voltage behaviour. High voltage test results and thermal measurements are also presented.
Starting Page	1574
Ending Page	1576
File Size	181079
Page Count	3
File Format	PDF
ISBN	9781424409167
DOI	10.1109/PAC.2007.4440827
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Large Hadron Collider Conductors Impedance Voltage Pulsed power supplies Optical coupling Magnetic field measurement Resonance Power transmission lines Resistors
Content Type	Text
Resource Type	Article

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