The HADES pre-shower detector
A. Balanda, M. Jaskula, M. Kajetanowicz, L. Kidon, K. Korcyl, W. Kuhn, R. Kulessa, A. Malarz, J. Otwinowski, M. Petri, J. Pietraszko, W. Prokopowicz, W. Przygoda, P. Salabura, A. Skoczen, M. Szczybura, E. Wajda, W. Walus, M. Wisniowski, T. Wojcik
abstract
The Pre-Shower detector was built for the high acceptance di-electron spectrometer to identify electrons produced in pion, proton and heavy ion-induced reactions in the 0.2 < p < 1.5 GeV/c momentum range. The system is composed of three layers of wire chambers interleaved with two layers of lead converters for electromagnetic shower formation. A scintillator wall is placed in front of the detector for time-of-flight measurements. The paper describes the Pre-Shower detector construction, the detector operation, the read-out electronics and its response to charged particles studied with electron, proton and heavy ion beams. (c) 2004 Elsevier B.V. All rights reserved.
Performance of the pre-shower system in the HADES spectrometer
J. Pietraszko, A. Balanda, M. Jaskula, L. Kidon, R. Kulessa, E. Lubkiewicz, A. Malarz, J. Otwinowski, W. Prokopowicz, W. Przygoda, P. Salabura, E. Wajda, W. Walus, M. Pioskon, T. Wojcik, M. Kajetanowicz, K. Korcyl, A. Skoczen
abstract
The Pre-Shower detector system of the HADES spectrometer is applied to electron identification with emphasis on fast hadron rejection at forward angles. The detector is operated in the self-quenching streamer mode (SQS) to simplify on-line recognition of electromagnetic showers. Stable electronics at low noise guarantee robust pattern recognition through the experimental runs. The construction and performance of the detector is presented.
Development of a fast pad readout system for the HADES shower detector
A. Balanda, M. Debowski, M. Jaskula, L. Kidon, R. Kulessa, J. Foryciarz, E. Lubkiewicz, A. Malarz, J. Otwinowski, J. Pietraszko, W. Prokopowicz, A. Ratajczak, P. Salabura, E. Wajda, W. Walus, M. Kajetanowicz, K. Korcyl, A. Skoczen, W. Kuhn, M. Petri
abstract
The paper presents the readout system for the 18432 channels of the HADES shower detector. The readout system consists of an analog front-end ASIC for the readout of the pad multiwire chamber, a resdout controller board, the so-called readout board for collection and digitization of the analog information from the ASIC and an optical link system for the data transfer. The readout system is designed to cope with event rate of 10(5) events/s and a data transfer rate of 1.9 Gbyte/s. Utilizing a multistage fast multiplexing system, the cost per channel is kept on the level of $5. Recent results from a test experiment confirm the intended performance of the readout system. (C) 1998 Elsevier Science B.V. All rights reserved.
