Speaker
Bernhard Ledermann
(Uni Karlsruhe)
Description
A Time Projection Chamber (TPC) with GEM technology is well-suited for
usage as central tracker at the International Linear Collider (ILC). To study
the high potential of this detector type a small prototype of 25 cm length
was built in Karlsruhe and used in several experimental setups. We present
the results of these measurements and of additional MonteCarlo
simulations. By introducing the so-called equivalent drift distance a
combination of all results was possible leading to a recommended
configuration of the multi-GEM tower for the ILC-TPC. It will be shown that
for conditions considered in the TESLA-TDR the transverse spatial resolution
will be able to reach 65 μm for 10 cm and 190 μm for 200 cm drift at the
ILC. Expectations for longitudinal spatial resolution are 200 μm respectively
720 μm for the same drift distances. Further investigations showed that
replacing the rectangular pad geometry by alternative geometries does not
lead to an improvement of spatial resolution. Additional results include
possible energy resolutions for the specific ionization of ≈ 4 % and a single
pad row efficiency of > 99 %.
Author
Bernhard Ledermann
(Uni Karlsruhe)
