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The on-line event reconstruction in ALICE is performed by the High Level Trigger, which should process up to 2000 events per second in proton-proton collisions and up to 300 central events per second in heavy-ion collisions, corresponding to an input data stream of 30 GB/s. In order to fulfill the time requirements, a fast on-line tracker has been(More)
The front end electronics for the ALICE time projection chamber (TPC) consists of about 560000 channels packed in 128-channel units (front end card). Every front end card (FEC) incorporates the circuits to amplify, shape, digitize, process and buffer the TPC pad signals. From the control and readout point of view the FECs are organized in 216 partitions,(More)
In this paper we present the front end electronics for the time projection chamber (TPC) of the ALICE experiment. The system, which consists of about 570000 channels, is based on two basic units: (a) an analogue ASIC (PASA) that incorporates the shaping-amplifier circuits for 16 channels; (b) a mixed-signal ASIC (ALTRO) that integrates 16 channels, each(More)
The ALICE High Level Trigger combines and processes the full information from all major detectors in a large computer cluster. Data rate reduction is achieved by reducing the event rate by selecting interesting events (software trigger) and by reducing the event size by selecting sub-events and by advanced data compression. Reconstruction chains for the(More)
The central detectors of the ALICE experiment at LHC will produce a data size of up to 75 MB=event at an event rate p200 Hz resulting in a data rate of B15 GB=s: Online processing of the data is necessary in order to select interesting (sub)events (‘‘High Level Trigger’’), or to compress data efficiently by modeling techniques. Processing this data requires(More)
The ALICE high level trigger has to process data online, in order to select interesting (sub)events, or to compress data efficiently by modeling techniques. Focusing on the main data source, the time projection chamber (TPC), we present two pattern recognition methods under investigation: a sequential approach (cluster finder and track follower) and an(More)
The ALICE High Level Trigger comprises a large computing cluster, dedicated interfaces and software applications. It allows on-line event reconstruction of the full data stream of the ALICE experiment at up to 25 GByte/s. The commissioning campaign has passed an important phase since the startup of the Large Hadron Collider in Nov 2009. The system has been(More)
In this article we introduce the low-energy CZT (CdZnTe) 16 384-pixel detector array on-board the Atmosphere Space Interaction Monitor (ASIM), funded by the European Space Agency. This detector is a part of the larger Modular X-and Gamma-ray sensor (MXGS). The CZT detector array is sensitive to photons with energies between 15 keV and 400 keV. The principal(More)
The ALICE detector is a dedicated heavy-ion detector at the large hadron collider which is commissioned end of 2007 at CERN. The ALICE triggers are handled by the central trigger processor and distributed to all sub-detectors, amongst other the time projection chamber and the photon spectrometer. The front end electronics of the time projection chamber and(More)