Abstract
An electrostatic injection kicker (ES-Kicker) has been developed and installed in the KEK digital accelerator, which is a synchrotron aimed at accelerating all ion species. The ES-Kicker kicks an injected ion beam horizontally into the ring orbit and consists of two main electrodes for electric field generation and three intermediate electrodes to correct field homogeneity. In our single-turn injection scheme, the circulating beam and the injected beam both pass through the electrode aperture of the kicker, so the kicker field must be turned off before arrival of the first circulating beam. The ES-Kicker is therefore operated in a pulse mode. This means that the excitation circuit for the ES-Kicker must be carefully designed, since the falling edge of the electric field is strongly affected by parasitic capacitance of this circuit, and any remaining field may disturb the circulating beam. This paper describes performance of the ES-Kicker on the basis of simulations and measurement results.
Highlights
The KEK digital accelerator (KEK-DA; Fig. 1) is a synchrotron aimed at accelerating all ion species [1,2,3]
An electron cyclotron resonance ion source embedded in a 200 kV high-voltage platform generates an ion beam, which is guided through a low-energy beam transport line and injected into the KEK-DA by an electrostatic injection kicker (ES-Kicker) [1]
Since the typical revolution time is of the order of 10 s (e.g., 12 s for He1þ of 200 keV), the injected beam duration is a few microseconds
Summary
The KEK digital accelerator (KEK-DA; Fig. 1) is a synchrotron aimed at accelerating all ion species [1,2,3]. It takes considerable time to calculate a suitable shape of the electrodes, especially in the case that a high-quality field is needed over a large area The latter structure is easy for obtaining good field homogeneity even over a large area, in the horizontal plane and in the vertical plane. The kicker field must be turned off before arrival of the first circulating beam to avoid disturbance This must occur within a few microseconds in our case, so the ES-Kicker is operated in a pulse mode. Kick angle Electrode length Aperture (width  height) Good field aperture (width  height) Maximum repetition rate Injection beam period Maximum anode voltage Maximum charging time Maximum discharging period
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