Investigation of UV laser ionisation in argon-based gas mixtures with a Triple-GEM detector

In the gas detectors, the ionisation mechanisms of the charged particles and X-ray/γ-photons are well studied by theory and experiment. However, on the experimental measurements of the ionisation ability of the lasers, publications only give the estimation results. This study aims to fill the gap and measures the laser ionisation precisely. A GEM detector and an optical system have been set up to measure the laser ionisation. The purity of each...