Bochum 2018 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 13: Instrumentation V
HK 13.1: Gruppenbericht
Montag, 26. Februar 2018, 16:30–17:00, HZO 80
Data preprocessing of the DAQ system for TOF detector in CBM experiment — •Wenxiong Zhou1,2, Pierre Ioizeau1, Jochen Fruehauf1, Junfeng Yang1, David Emschermann1, and Walter Muller1 for the CBM collaboration — 1GSI Helmholtz Center for Heavy Ion Research, Darmstadt, Germany — 2Chongqing University, Chongqing, China
In order to acquire the larger volume of data in the Compressed Baryonic Matter (CBM) experiment, a new free-trigger data acquisition (TLDAQ) system will be used. TOF detector is one of the detectors will be used in the CBM experiment. To ensure the correct data transfer and easy data reconstruction in the TOF DAQ system, the data should be processed before it is sent to back-end computer cluster. Therefore, a data preprocessing board is needed. In additional to the time data of the TOF detector, there is also epoch data from every front end electronics (FEE). The epoch data is very important for the TLDAQ system, it is the foundation of the event reconstruction in back-end computer. To reduce data volume and simplify the event reconstruction, the same epoch events from different FEEs should be merged into one event. A data preprocessing method is proposed to solve this problem. The process is divided into two parts. The first part is used to separate epoch event from data event. Every input FEE has a such module. The second part is used to merge data and epoch from different FEEs into one frame. This architecture can avoid the decreasing of data transfer speed when there are many input FEEs.