Objective
The measurement of electron-positron pairs in heavy-ion collisions provides the unique opportunity to study the in-medium properties of vector mesons, which is a fundamental issue in modern nuclear, hadron and particle physics. The lepton pair is a "penetrating probe" because it delivers undistorted information on the conditions inside the dense fireball. The Compressed Baryonic Matter (CBM) experiment at the future accelerator facility in Darmstadt will be equipped with a Transition Radiation Detector (TRD) for electron identification and pion suppression. The challenges in this experiment are the reaction rates of up to 10 MHz and charged particle multiplicities of up to 1000. State-of-the-art photon detectors - which are the crucial components of TRD's - are too slow to be used in these measurements.
The goal of this project is to develop large-area position-sensitive gas-chambers for photon detection with a very fast response. The project includes the design and construction of the gas detector based on micro-pattern structures (GEM and Micromegas), the development of fast low-noise read-out electronics, and the test of the detector prototype with electron and pion beams using various gas mixtures. The results of the simulations will be documented in a progress report end of 2004. The detector design and the test results will be presented in the technical proposal end of 2005.
Large-area position-sensitive and fast photon detectors have a wide field of applications such as X-ray imaging for material and biological research. The participating teams are well experienced in performing detector and electronic design and construction. The collaboration has access to the necessary technical infrastructure resources in NIS and INTAS member states. This project is an important contribution to the realization of an experimental research program in future heavy-ion physics.
Topic(s)
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64291 Darmstadt
Germany