Speaker
David Attie
(CEA Saclay)
Description
The Time Pro jection Chamber (TPC) for the International Linear Collider
(ILC) will measure about 200 track points with a resolution close to 100 μm.
A Micro Pattern Gas Detector (MPGD) readout TPC may achieve the target
resolution with existing techniques using 1 mm or narrower pads at the
expense of increasing the detector cost and complexity. The new MPGD readout
technique of charge dispersion has the potential to achieve good resolution
without resorting to narrow pads. This has been demonstrated with 2 mm × 6
mm TPC readout pads for the GEMs and the Micromegas in cosmic ray tests and
in a beam test at KEK in a 1 T magnetic field. The charge dispersion readout
concept has been tested for the first time in a high field super-conducting
magnet at DESY using a Micromegas-TPC. The measured Micromegas gain has
been found to be constant within 0.5% for magnetic fields up to 5 T. The
measurement results and the TPC resolution performance for cosmic rays at
high magnetic fields will be presented.
Primary author
David Attie
(CEA Saclay)
Co-author
Madhu Dixit
(Carlton Uni, Ottawa)
