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Résumé du preprint DAPNIA-05-232

DAPNIA-05-232
Spatial Resolution of a Micromegas TPC Using the Charge Dispersion Signal
A. Bellerive, K. Boudjemline, R. Carnegie, M. Dixit, J. Miyamoto, E. Neuheimer, A. Rankin, E. Rollin, K. Sachs, J.-P. Martin, V. Lepeltier, P. Colas, A. Giganon, I. Giomataris
The Time Projection Chamber (TPC) for the International Linear Collider will need to measure about 200 track points with a resolution close to 100 $\\mu$m. A Micro Pattern Gas Detector (MPGD) readout TPC could achieve the desired resolution with existing techniques using sub-millimeter width pads at the expense of a large increase in the detector cost and complexity. We have recently applied a new MPGD readout concept of charge dispersion to a prototype GEM-TPC and demonstrated the feasibility of achieving good resolution with pads similar in width to the ones used for the proportional wire TPC. The charge dispersion studies were repeated with a Micromegas TPC amplification stage. We present here our first results on the Micromegas-TPC resolution with charge dispersion. The TPC resolution with the Micromegas readout is compared to our earlier GEM results and to the resolution expected from electron statistics and transverse diffusion in a gaseous TPC.

DAPNIA-05-232

Spatial Resolution of a Micromegas TPC Using the Charge Dispersion Signal

A. Bellerive, K. Boudjemline, R. Carnegie, M. Dixit, J. Miyamoto, E. Neuheimer, A. Rankin, E. Rollin, K. Sachs, J.-P. Martin, V. Lepeltier, P. Colas, A. Giganon, I. Giomataris

The Time Projection Chamber (TPC) for the International Linear Collider will
need to measure about 200 track points with a resolution close to 100 $\\mu$m. A
Micro Pattern Gas Detector (MPGD) readout TPC could achieve the desired
resolution with existing techniques using sub-millimeter width pads at the
expense of a large increase in the detector cost and complexity. We have
recently applied a new MPGD readout concept of charge dispersion to a prototype GEM-TPC
and demonstrated the feasibility of achieving good resolution with pads
similar in width to the ones used for the proportional wire TPC. The charge dispersion
 studies were repeated with a Micromegas
TPC amplification stage. We present here our first results on the Micromegas-TPC
resolution with charge dispersion. The TPC resolution with the Micromegas
readout is compared  to our earlier GEM results and to the resolution expected
from electron statistics and transverse diffusion in a  gaseous TPC.