# Development of a Time Projection Chamber Readout with Hybrid Pixel Sensors for Beam Monitoring

## TL;DR

This paper introduces HiBeam-T, a system using pixel sensors to monitor carbon beams in real-time with high precision.

## Contribution

The novel contribution is the development of HiBeam-T, a TPC readout system with hybrid pixel sensors for beam monitoring.

## Key findings

- HiBeam-T uses forty Topmetal-II-CMOS pixel sensors for beam monitoring.
- The system achieved a beam center measurement resolution of 6.45 μm.
- The detector has a sensitive area of 20 × 20 cm and includes charge drift and collection regions.

## Abstract

To monitor the position and profile of therapeutic carbon beams in real-time, in this paper, we proposed a system called HiBeam-T. The HiBeam-T is a time projection chamber (TPC) with forty Topmetal-II- CMOS pixel sensors as its readout. Each Topmetal-II- has 72 × 72 pixels with the size of 83 μm × 83 μm. The detector consists of the charge drift region and the charge collection area. The readout electronics comprise three Readout Control Modules and one Clock Synchronization Module. This Hibeam-T has a sensitive area of 20 × 20 cm and can acquire the center of the incident beams. The test with a continuous 80.55 MeV/u 12C6+ beam shows that the measurement resolution to the beam center could reach 6.45 μm for unsaturated beam projections.