The ionisation electrons drift from the cathode to the sides of the TPC, where they are detected by the MicroMegas providing a 3D image of a path of the traversing charged particle. Y and Z coordinates are based on the position of the detected ionisation electrons on the MicroMegas modules, and X coordinate is based on the electrons drift time.
The ionization electrons travel from the cathode to the sides of the TPC, where they are measured by MicroMegas to create a 3D image of the particle's path. The X-coordinate is determined by the time it takes for the electrons to drift, while the Y and Z coordinates are based on their position on the MicroMegas modules.