Picosec Gaseous Detectors for Fast-timing Applications

The future strategy of experimental particle physics plans to build colliders with increasing luminosity and energy to todays machines. Especially at increasing luminosities the correct separation of vertices becomes more difficult. This is only possible with detector systems that provide time resolution in the range of some 10 ps. The RD51 collaboration ''Development of Micro-Pattern Gas Detectors Technologies'' have presented a detector concept with an expected time resolution in the demanded range. The Picosec gaseous detector prototypes are based on the working principles of Micromegas detectors. A time jitter of some nanoseconds is inevitable due to different positions of the primary ionization cluster in the drift zone of a Micromegas. Instead the Picosec detector have a Cherenkov radiator in front of the gaseous volume. The photons of this radiator are converted in a photocathode. The drift gap can be reduced to some 100 micrometres as all primary ionized electrons are located in the photocathode. Several prototypes of this detector were tested in 2017 at the SPS beam at CERN. A time resolution of up to 24 ps was reached during this measurements. The poster introduces the concept of the Picosec detector as well as the beam setup and first results from the 2017 beam measurements.