Speaker
Description
Among many other Micro Pattern Gaseous Detectors (MPGD), the Gas Electron Multiplier (GEM) is specially remarkable for very good spatial, temporal and energy resolution, stable high gain as well as low ion feedback. For its excellent performance, the GEMs are being adopted in many HEP experiments such as ALICE, CMS, CBM etc. ALICE has reported to upgrade the gas-amplification technology of their Time Projection Chamber (TPC) from Multi Wire Proportional.
The high-multiplicity environment of Pb–Pb collisions at 50 kHz after LS2, leads to a significant accumulation of positive ions from the gas-amplification regions to the drift volume of the ALICE TPC. This gives rise to a considerable non-uniformity of electric field in the TPC for a high-event rate experiment. Therefore the upgrade demands a robust detector for the TPC endplate which has convenient geometry for intrinsic ion suppression.
We study the basic properties of the GEM. We have started from stretching
a single GEM foil and studying its properties like gain, collection efficiency and
most importantly the ion backflow for different gas mixtures. The report describes
the behavior of a GEM foil and it also presents a comprehensive comparison of
single GEM with the GEM stacks.
| Presentation type | Oral |
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