NDLI: Beam Impedance Measurement by the Wire Method Using a Synthetic Pulse Technique

Content Provider	IEEE Xplore Digital Library
Author	Caspers, F.
Copyright Year	1963
Abstract	The coaxial wire method is widely used to simulate the image current and the electromagnetic field of a bunch. Measurements are usually performed in frequency (impedance) or time-domain (k-parameter). Some limits of validity and possible sources of error applying this simulation method are discussed. In general one may expect correct results if measurements are restricted to single localized impedances much smaller than the characteristic impedance of the coaxial line (beampipe with center wire). In case of more than one localised small impedance in a given beampipe time-filtering can be applied, provided there is sufficient spatial separation to reduce the problem to the case of isolated single impedances and to eliminate multiple reflections from nonmatched 50 ohm transitions at the end of the beampipe. The technique consists in generating a synthetic pulse in time domain via FFT, from measurements taken in the frequency domain. This leads to higher spectral power density than realtime or sampling pulse measurements thus giving higher dynamic range and better reproducibility. The impedance Z(¿) as well as the loss parameter k as a function of the bunch length l. can then be deduced by computations.
Sponsorship	IEEE Nuclear and Plasma Sciences Society Computer Applications in Nuclear and Plasma Sciences (CANPS) Lawrence Berkeley Lab. Lawrence Livermore Nat. Lab. APS College of William and Mary Continuous Electron Beam Accelerator Facility NASA Defence Nuclear Agency Sandia National Laboratories Jet Propulsion Laboratory Brookhaven Nat. Lab. Lawrence Livermore Nat. Lab IEEE/NPPS Radiat. Effects Committee Defence Nuclear Agency/DoD Sandia National Laboratories/DOE Jet Propulsion Laboratory/NASA Phillips Lab./DoD
Starting Page	1914
Ending Page	1916
Page Count	3
File Size	612434
File Format	PDF
ISSN	00189499
Volume Number	32
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1985-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Impedance measurement Wire Pulse measurements Coaxial components Frequency measurement Electromagnetic measurements Electromagnetic fields Performance evaluation Time domain analysis Optical reflection
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Electrical and Electronic Engineering Nuclear Energy and Engineering

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