Abstract
The development of fast detection methods for comprehensive monitoring of electron bunches is a prerequisite to gain comprehensive control over the synchrontron emission in storage rings with their MHz repetition rate. Here, we present a proof-of-principle experiment with at detailed description of our implementation to detect the longitudinal electron bunch profiles via single-shot, near-field electro-optical sampling at the Karlsruhe Research Accelerator (KARA). Our experiment is equipped with an ultra-fast line array camera providing a high-throughput MHz data stream. We characterize statistical properties of the obtained data set and give a detailed description for the data processing as well as for the calculation of the charge density profiles, which where measured in the short-bunch operation mode of KARA. Finally, we discuss properties of the bunch profile dynamics on a coarse-grained level on the example of the well-known synchrotron oscillation.
Highlights
To experimentally verify theoretical predictions on complex bunch dynamics in storage ring, the challenge is given by the typically high MHz-range repetition rates in combination with the requirement of a nondestructive single-shot technique to detect dynamics without averaging.A suitable technique will give further deep insights into microbunching and instabilities in storage rings, which is subject to intense investigations
We focus the pulses with a lens onto the 256-pixel silicon line array of the KIT-developed ultra-fast spectrometer “KArlsruhe Linear arraY detector for MHz-rePetition rate SpectrOscopy” (KALYPSO) [31] measuring every third revolution of the electron bunch in a singleshot scheme
We assume for the bunch profile ρi ∝ IM;i=IU;i − 1 ≕ ρi, where we introduced for convenience ρas a dimensionless quantity proportional to ρ
Summary
To experimentally verify theoretical predictions on complex bunch dynamics in storage ring, the challenge is given by the typically high MHz-range repetition rates in combination with the requirement of a nondestructive single-shot technique to detect dynamics without averaging. A suitable technique will give further deep insights into microbunching and instabilities in storage rings, which is subject to intense investigations. We briefly outline the underlying physics of the microbunching instability. The phase space of electron bunches in a storage ring is subject to a continuous long-term evolution.
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