Autor: Fransson, K. - Prolib Integro

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Tytuł:: A pellet tracking system for hadron physics experiments
Autorzy:: Fransson, K.
Jacewicz, Marek
Rudy, Zbigniew
Johansson, Tord
Pyszniak, Andrzej
Calén, Hans
Opis:: Frozen microspheres of hydrogen (pellets) are used as targets in the hadron physics experiment WASA (Forschungszentrum Jülich, Germany) [1] and will also be used in the future PANDA experiment at FAIR (GSI, Darmstadt, Germany) [2]. The interaction region is defined by the overlap of the pellet stream and the accelerator beam and has a size of a few millimeters. One would like to know the interaction point more precisely, to have better possibility to reconstruct particle tracks and events. One would also like to suppress background events that do not originate in a pellet, but e.g. may occur in residual gas in the beam pipe. A solution is provided by the presented pellet tracking system, for which a prototype [3] has been developed in Uppsala. The goal is to track individual pellets in order to know their position at the time of an interaction. The design of such a system, simulation techniques and results are presented.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Tytuł:: Studies on implementation of pellet tracking in hadron physics experiments
Autorzy:: Fransson, K.
Löfgren, Johan
Hejny, Volker
Rudy, Zbigniew
Johansson, Tord
Wüstner, P.
Pyszniak, Andrzej
Calén, Hans
Wolke, Magnus
Opis:: A system for optical tracking of frozen hydrogen microsphere targets (pellets) has been designed. It is intended for the upcoming hadron physics experiment PANDA at FAIR, Darmstadt, Germany. With such a tracking system one can reconstruct the positions of the individual pellets at the time of a hadronic interaction in the offline event analysis. This gives information on the position of the primary interaction vertex with an accuracy of a few 100 µm, which is very useful e.g. for reconstruction of charged particle tracks and secondary vertices and for background suppression. A study has been done at the WASA detector setup (Forschungszentrum Jülich, Germany) to check the possibility of classification of hadronic events as originating in pellets or in background. The study has been done based on the instantaneous rate a Long Range TDC which was used to determine if a pellet was present in the accelerator beam region. It was clearly shown that it is possible to distinguish the two event classes. Also, an experience was gained with operation of two synchronized systems operating in different time scales, as it will also be the case with the optical pellet tracking.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Tytuł:: A pellet tracking system for the PANDA experiment
Autorzy:: Pyszniak, Andrzej
Fransson, K.
Marciniewski, Paweł
Calén, Hans
Fridén, C-J.
Jacewicz, Marek
Rudy, Zbigniew
Johansson, Tord
Hellbeck, Elin
Opis:: Frozen microspheres of hydrogen (pellets) will be one of the target types for the future hadron physics experiment PANDA at FAIR (GSI, Darmstadt, Germany) [1]. Pellets with a diameter of 25– μm are generated about 3 meters above the interaction region, to which they travel with a velocity around 80 m/s inside a narrow pipe. The interaction region is defined by the overlap of the pellet stream and the accelerator beam and has a size of a few millimeters. One would like to know the interaction point more precisely, to have better possibilities to reconstruct particle tracks and events e.g. in charmonium decay studies. One would also like to suppress background events that do not originate in a pellet, but e.g. may occur in rest gas, that is present in the beam pipe. A solution is provided by the presented pellet tracking system together with a target operation mode that provides one and only one pellet in the interaction region most of the time. The goal is to track individual pellets in order to know their position with a resolution of a few tenths of a millimeter at the time of an interaction. The system must also be highly efficient and provide tracking information for essentially all pellets that pass the interaction region. Presented results from the design studies show that the goals can be fulfilled by this solution.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego