Speaker
Description
A Time Projection Chamber (TPC) module with GridPixes consisting of Timepix3 chips with integrated amplification grids have a high efficiency to detect single ionization electrons. This combination promises excellent tracking and dE/dx potential necessary to exploit the full physics reach of future colliders such as ILC, CLIC, CEPC, FCCee or EIC.
We have constructed a module with 32 GridPix chips and its performance was measured using data taken in a testbeam at DESY. The module was placed in between silicon detectors providing external tracking and then slided into the magnet at DESY. The analyzed data were taken at electron beam momenta of 5 and 6 GeV/c and at B = 0T and 1T.
The diffusion coefficients were measured with high precision. The tracking systematical uncertainties in the pixel plane were measured to be smaller than 13 microns.
The dE/dx or dN/dx resolution for electrons in the 1 T data was measured.
The projected particle identification performance of a GridPix TPC in ILD was evaluated. The expected pi/K separation for momenta in the range of 2.5-45 GeV/c is more than 4.5 sigma.
Other Pixel TPC analysis results will be presented: the single electron efficiency at high hit rates, the characterization of hit bursts and the resolution in the precision plane as a function of the incident track angle.
Finally, also the status of a new GridPix production center at Bonn will be discussed.
