Speaker
Esther Bartsch
(Johann-Wolfgang-Goethe Univ. (DE))
Description
For the upgrade of the ALICE Time Projection Chamber (TPC) at the
CERN LHC, the present multiwire proportional readout chambers will
be replaced by stacks of four Gas Electron Multipliers (GEMs).
GEMs are able to cope with the high Pb-Pb interaction rates of 50 kHz
anticipated in LHC Run3 and can be operated in continuous mode.
The main goal of optimization is the minimization
of the ion backflow (IBF) to avoid space-charge distortions in the
drift volume. At the same time, good energy resolution must be
provided in order to retain the excellent particle identification
capabilities of the TPC via dE/dx.
In this poster, the results of a detailed R&D program, aimed at the
optimization of the field configurations in a stack of four GEMs,
employing foils with different hole size, will be presented.
| On behalf of collaboration: | ALICE |
|---|
Primary author
Esther Bartsch
(Johann-Wolfgang-Goethe Univ. (DE))
