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Monte Carlo simulations for the Cherenkov Telescope Array Observatory using PL-Grid e-infrastructure

Barnacka A., Bogacz L., Grudzińska M., Janiak M., Komin N., Lamanna G., Moderski R.

Computer Science

2012

Vol. 13 (2)

113-122

The paper presents Monte Carlo simulations carried out during the preparatory phase of the Cherenkov Telescope Array project. The aim of the project is to build the next generation observatory of very high energy gamma rays. During the preparatory phase there is a need to optimize and verify design concepts for various elements of the array. In this paper we describe the main components of the software being used for that purpose, their functions and requirements. Preliminary results of the optimization of the small telescope – one of the several kinds intended for the array, are presented.

Szeregowa koncepcja kamery teleskopu CTA

Kasperek J., Koryciak S., Kozioł J. J., Rajda P. J., Ziętara K.

Pomiary Automatyka Kontrola

2010

R. 56, nr 7

739-741

W ramach European Research Area trwają prace nad konstrukcją macierzy teleskopów wykorzystujących zjawisko promieniowania Czerenkowa do obserwacji kosmosu w zakresie promieniowania o bardzo dużych energiach, rzędu 100GeV do 100TeV. Autorzy przedstawiają koncepcję budowy cyfrowej kamery teleskopu, opartej w dużej mierze na szybkich, szeregowych interfejsach danych, możliwych do implementacji w zaawansowanych układach FPGA. W artykule porównano opracowaną koncepcję z innymi, proponowanymi dotychczas. Przedstawiono również wybrane szczegóły konstrukcyjne.

One of the main astrophysical topics within the European Research Area is construction of Cherenkov Telescope Array. It is destined for observations of the space in very high energy gamma radiation ranges (100GeV to 100TeV). The authors of the paper introduce a serial concept of the digital camera for the CTA telescope. The concept is based on very fast serial ports, existing in high-performance FPGAs. Serial ports are intended to be used in the design for inter-chip, as well as for inter-board communication. The paper compares the described concept with another, proposed so far. All Cherenkov observatories existing so far exploit the analog or digital data acquisition along with analog trigger circuit. Implementing the trigger circuit in the digital domain enables full reconfigurability of the camera. It allows fitting the trigger algorithm to the current needs and improving it due to the gathered experience. However, digital processing of signals from 1…2k photomultipliers in each camera induces a very complex circuit. To simplify the design there is proposed applying quad ADCs with serial outputs of 500 Mbps to 4 Gbps. It will allow reduction of the required number of PCB layers. Another proposed improvement is integration of signals, connecting clusters of 16 photomultipliers with the central board. Embedding the synchro-start signal within the clock signal, as well as transmission of all remaining data through the 2-pair, 2-way Common Serial Interface reduces the number of the required twisted pairs to only 3. Both above propositions reduce the number of cables and connectors by 9. Additionally, there are explained a few construction details of test designs.