Abstract
The Single Bunch Selector (SBS) will be used on the Spiral2 linear accelerator to reduce the rate of high energy bunches reaching the target with, in principle, no residual particles from the suppressed bunches. For this purpose, a pulsed electromagnetic wave will travel along the $100\text{ }\text{ }\ensuremath{\Omega}$ microstrip meander line electrode of the SBS. In this work we describe the broadband accurate characterization of the electrode electromagnetic features. The method applied here leads to the analytical determination of complex characteristic impedance, propagation constant, and group velocity from a measurement of the $50\text{ }\text{ }\ensuremath{\Omega}$ scattering parameters on the meander transmission line. Particular care is given to the de-embedding phase of the transitions required to connect the meander electrode to the measurement device.
Highlights
The Spiral2 linear accelerator [1] is under construction at GANIL Laboratories in Caen, France
It will be required to have only one bunch over N with, in principle, no residual particles from the suppressed bunches. These operations will be necessary already for the first experiments with the new Spiral2 beam, and will be performed by a medium energy chopper, called Single Bunch Selector [2,3,4,5,6]. In this traveling-wave device, a static magnetic steerer will permanently deviate the bunches on a dedicated beam-stop and a pulsed electromagnetic wave, traveling on a microstrip meander transmission line, will let the selected bunch be properly realigned and delivered to the downstream beam line [2,4]
In this paper we describe a broadband and accurate method for the determination of complex characteristic impedance, propagation constant, and group velocity of this nonstandard 100 microstrip meander line, from measurements of 50 scattering parameters
Summary
The Spiral linear accelerator [1] is under construction at GANIL Laboratories in Caen, France. The first element of the rf chain circuit related to the single meander electrode is a 100 À 1 kW power supply (DC coupled) suitable to produce the required pulse [4], that was supplied by the manufacturer with a custom 100 coaxial output cable. The connection between this cable and the meander line electrode was one of the most delicate topics. It takes into account the influence due to the transitions connecting the meander line to the network analyzer, and it is applied for two different measurement setups of the electrode
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