The International Linear Collider (ILC) will require a large volume Time Projection Chamber (TPC) with transverse space-point resolution of 100 μm for all tracks over the full 2 m drift region. It has been shown that a conventional readout GEM TPC can achieve this resolution using 1 mm or narrower readout pads, at the expense of detector cost and complexity. A new readout technique using the principle of charge dispersion has demonstrated that the transverse resolution goal can be achieved using 2-3 mm wide pads in both small (COSMo) and large (LCTPC) prototype detectors. However, the effect of this new technique on the time resolution was not a part of these studies. Here we present re-analyses of a 4 GeV π+ beam test at KEK and a high magnetic field cosmic ray test at DESY carried out with the COSMo TPC with charge dispersion. We find the time resolution comparable to conventional MPGD and wire/pad readout TPCs, and consistent with the ILC z-resolution requirements of 500 and 1400 μm at zero and 2 m drift distances, respectively.

Additional Metadata
Keywords Gas electron multiplier, Gaseous detectors, ILC, Micro pattern gas detectors, Micromegas, Position-sensitive detectors
Conference 13th International Conference on Advanced Technology and Particle Physics, ICATPP 2011
Citation
Bellerive, A. (2012). Timing resolution studies of micro pattern gas detectors using the charge dispersion signal. Presented at the 13th International Conference on Advanced Technology and Particle Physics, ICATPP 2011.