Timing resolution studies of micro pattern gas detectors using the charge dispersion signal
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.
|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|
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.