Abstract
The International Linear Collider (ILC) damping ring (DR) injection and extraction kickers have a very special role: the bunch spacing 189--480 ns is compressed to 3--9 ns when injected into the DR and then decompressed to 189--480 ns when leaving the DR. The kickers act as a bunch-by-bunch beam manipulator to compress and decompress the bunch spacing into/from the DR. They require a fast rise/fall time (3--9 ns) and a high repetition rate (6--2 MHz). Among the candidate technologies, the multiple strip-line kicker system is the most likely to realize the specifications for the ILC reference design. A beam extraction experiment with a prototype strip-line kicker has been carried out at the KEK Accelerator Test Facility (ATF). The kicker is composed of two units of 60-cm-long strip-line electrodes. The multibunch beam (30 bunches spaced at 5.6 ns) stored in the DR was extracted successfully with a bunch spacing of 308 ns. The measured stability of the kick angle was $3.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. Some, but not all, parameters of the tested kicker meet the ILC-DR injection/extraction kicker requirements.
Highlights
The International Linear Collider (ILC) is an electronpositron collider with a 200–500 GeV center of mass energy
III E.) If we examine the waveform of the burst pulse, we see that the first pulse has insufficient amplitude and the following pulses have droop
The kick angle is evaluated from the measured beam positions using 19 beam position monitors (BPMs) assuming designed beam line optics
Summary
The International Linear Collider (ILC) is an electronpositron collider with a 200–500 GeV center of mass energy. The kicker requires a high repetition frequency of 6 (to 2) MHz and a very fast rise/fall time of 3 (to 9) ns for the kick field. In work at the accelerator test facility damping ring (ATF DR) in the High Energy Accelerator Research Organization, Naito et al have already tested a single strip-line kicker using a high-voltage semiconductor pulse source and measured the rise/fall time of the beam kick field [3,4]. Have already proposed a strip-line kicker using a single unit for TESLA [5], and Alesini et al have developed a tapered strip line for the injection of DAÈNE [6] Their designs and results provide useful information for our own work. The characteristics of the extracted beam can be measured in this experiment using the beam position monitors at the extraction line
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