High-speed RF Switch Electronics for picking up of Electron-Positron Beam Bunches

TL;DR

This paper introduces a high-speed RF switch circuit capable of distinguishing electron and positron beam bunches within 6 nanoseconds, enabling real-time beam diagnostics in particle accelerators.

Contribution

The paper presents a novel RF switch design with sub-6 ns switching time and precise delay control for real-time beam bunch separation in electron-positron colliders.

Findings

Successfully demonstrated switching within 6 ns in laboratory tests

Achieved precise delay adjustment of approximately 10 ps

Enabled potential for simultaneous measurement of electron and positron beams

Abstract

Beam diagnostics is important to guarantee good quality of beam in particle accelerator. Both the electron and positron run in the tunnel in some modern electron positron colliders such as Circular Electron Positron Collider (CEPC) to be built and Beijing Electron Positron Collider II (BEPC II). To measure the electron and positron beams, picking up of these two different bunches in real time is of notable concern. Because the time interval between adjacent electron and positron bunches is quite small, for example, 6 ns in CEPC, high-speed switch electronics is required. This paper presents the prototype design of a high-speed radio frequency (RF) electronics that can pick up nanosecond positron-electron beam bunches with a switching time of less than 6 ns. Fast separation of electron and positron is achieved based on RF switches and precise delay adjustment of the controlling signals (~10 ps). Initial tests have been conducted in the laboratory to evaluate the performance of electronics, the results indicate that this circuit can successfully pick up the bunch signal within a time interval of 6 ns, which makes it possible to further measure the electron and position beams simultaneously.