Abstract
Stripline kickers are commonly used for on-axis injection in the low emittance rings. The beam coupling impedances of the kickers normally show large contributions to the total impedance budget. In the High Energy Photon Source, the necessity of the short pulse bottom width (less than 10 ns) and strong deflection field requires the kicker to have a short length and a small gap between the electrodes, respectively. A new five-cell stripline kicker is proposed in order to save longitudinal space as well as to reduce the beam coupling impedance. Comprehensive studies have been undertaken to characterize the impedance of the stripline kicker. The beam coupling impedance and heat load dissipation on the kicker due to the beam passage are studied numerically. Strategies to further reduce the impedance are discussed. In addition, impedance bench measurements are launched to identify the impedance of the kicker experimentally. The longitudinal beam coupling impedance is measured with different terminations by using coaxial wire method. A satisfactory agreement has been reached between the numerical predictions and the measurements. A novel fasten block design with ceramic is proposed for the wire stretching and the center holding of the inner conductor in a small beam pipe.
Highlights
A new generation of storage ring based light sources has been proposed in recent years to reach diffraction limited emittance of tens of pm [1,2,3,4,5]
A new five-cell stripline kicker is proposed in High Energy Photon Source (HEPS) in order to conserve longitudinal space as well as to reduce the beam coupling impedances
The results show that both the longitudinal and transverse impedances of the five-cell stripline kicker present transverse electromagnetic (TEM)-mode-like resonances below ∼4 GHz
Summary
A new generation of storage ring based light sources has been proposed in recent years to reach diffraction limited emittance of tens of pm [1,2,3,4,5]. Among the most important considerations during the design of the stripline kicker are the beam coupling impedance and the beam energy deposition in the electrodes or the terminations during the beam passage. The electromagnetic field generated during the beam passage can induce heat load on the electrodes and propagate through the feedthroughs to the resistive terminators. The beam coupling impedance and heat load dissipation on the kicker are first studied numerically. In order to characterize the impedance of the stripline kicker experimentally, as well as to identify the influence of the nonideal matching from the feedthroughs and the terminations, coaxial bench measurements have been carried out and benchmarked with numerical simulations.
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