We report the successful operation of a functional pixel detector with gaseous helium cooling. Using an accurate mock-up beforehand, the cooling was validated. We use a miniature turbo compressor to propel the helium at 2g/s under ambient pressure conditions with gas temperatures above 0∘C. Our earlier results based on computational fluid dynamics simulations and a much simpler mock-up are confirmed. With this, we paved the path to cool pixel detectors in experimental particle physics at heat densities up to 400mW/cm2 using helium. This enables cooling of detectors with very low mass requirements, minimising the effects of multiple Coulomb scattering effectively. The concept presented here is not limited to pixel detector applications and can be used to cool any surface with comparable heat-densities, only limited by shaping the helium gas flow.
@article{arxiv.2301.13813,
title = {Successful cooling of a pixel tracker using gaseous helium: studies with a mock-up and a detector prototype},
author = {Thomas Theodor Rudzki and Frank Meier Aeschbacher and Marin Deflorin and Niculin Flucher},
journal= {arXiv preprint arXiv:2301.13813},
year = {2023}
}