# R&D status of a gas-compressor based two-phase CO2 cooling system for FPCCD Vertex Detector

## TL;DR

This paper reports on the development of a two-phase CO2 cooling system using a gas compressor for FPCCD vertex detectors at ILC, aiming to achieve effective cooling down to -40°C to enhance radiation immunity.

## Contribution

It introduces a novel gas-compressor based two-phase CO2 cooling system specifically designed for FPCCD vertex detectors, with detailed R&D progress at KEK.

## Key findings

- Successful development of the cooling system prototype.
- Achieved cooling performance down to -40°C.
- Potential for improved radiation immunity in FPCCD detectors.

## Abstract

Fine pixel CCD (FPCCD) is one of the candidate sensor technologies for the vertex detector used for experiments at the International Linear Collider (ILC). FPCCD vertex detector is supposed to be cooled down to -40 degree for improvement of radiation immunity. For this purpose, a two-phase CO2 cooling system using a gas compressor for CO2 circulation is being developed at KEK. The status of this R&D is presented in this article.