# Design and operation of a prototype interaction point beam collision feedback system for the International Linear Collider

## TL;DR

This paper presents the design, implementation, and testing of a high-resolution beam collision feedback system prototype for the International Linear Collider, demonstrating its ability to stabilize beam position with nanometer precision within tight latency constraints.

## Contribution

It introduces a novel high-resolution intratrain feedback system prototype with real-world testing, meeting the stringent requirements for the ILC.

## Key findings

- Achieved 450 nm stabilization of the third bunch in a train
- Closed-loop latency of 148 ns confirmed effective correction
- System maintained performance over a ±60 μm correction range

## Abstract

A high-resolution, intratrain position feedback system has been developed to achieve and maintain collisions at the proposed future electron-positron International Linear Collider (ILC). A prototype has been commissioned and tested with a beam in the extraction line of the Accelerator Test Facility at the High Energy Accelerator Research Organization in Japan. It consists of a stripline beam position monitor (BPM) with analogue signal-processing electronics, a custom digital board to perform the feedback calculation, and a stripline kicker driven by a high-current amplifier. The closed-loop feedback latency is 148 ns. For a three-bunch train with 154 ns bunch spacing, the feedback system has been used to stabilize the third bunch to 450 nm. The kicker response is linear, and the feedback performance is maintained, over a correction range of over $\pm$60 {\mu}m. The propagation of the correction has been confirmed by using an independent stripline BPM located downstream of the feedback system. The system has been demonstrated to meet the BPM resolution, beam kick, and latency requirements for the ILC.