M. Bellato

The TMR network project "Development of γ-ray tracking detectors"

The next generation of 4 pi arrays for high-precision gamma -ray spectroscopy will involve gamma -ray tracking detectors. They consist of high-fold segmented Ge detectors and a front-end electronics, based on new digital signal processing techniques, which allows to extract energy, timing and spatial information for a gamma -ray by pulse shape analysis of the Ge detector signals. Utilizing the information on the positions of the interaction points and the energies released at each point the tracks of the gamma -rays in a Ge shell can be reconstructed in three dimensions.

Global Trigger and Readout System for the AGATA Experiment

AGATA is a 4-pi array of high purity Ge detectors for in-beam gamma-ray spectroscopy based on the novel concepts of pulse shape analysis (PSA) and gamma-ray tracking. Tracking and PSA require the concurrent digitization-at a sampling rate of 100 Msamples/s-of preamplifier signals of the 36-fold segmented Ge crystals composing the array. Locally digitized data are optically transferred to remote pre-processing nodes for pulse energy computation. The design of the front-end readout and level-1 (L1) trigger in AGATA follows a synchronous pipeline model: the detector data are stored in pipeline buffers at the global AGATA frequency, waiting the global L1 decision. A global timing system provides a reference clock and time tag to the digitizers and the pre-processing units by means of a tree of optically connected timing units. Pre-processing nodes are integrated in advanced TCA-based carrier cards with full mesh connectivity in the backplane and read-out through pci-express based optical links. The front-end data readout and its integration in the global trigger and synchronization system will be described.

A 12-channel 14/16-bit 100/125-MS/s digitizer with 24-Gb/s optical output for AGATA/GALILEO

A 12-channel digitizer card with 24 Gb/s optical output and -10 W power consumption is presented, specifically developed for the AGATA and GALILEO germanium array detectors. The card has many useful features, including: differential-input mode, end termination for both differential and common mode components of the input signals, introduction and remotely-controlled regulation of differential DC offset for dynamic range maximization, two remotely selected working ranges, built in test-pattern waveform multiplexed at the analog inputs for precise inter-channel time synchronization, optional interleaved mode for equivalent sampling-frequency multiplication, optional fast channel with remotely controlled threshold comparator working as an analog trigger for ancillary detectors. The card has been conceived for new-generation, highly-segmented, position-sensitive HPGe detectors for nuclear physics experiments, requiring digitization at 100 Ms/s 14bit or better, and is adequate for high-resolution gamma-spectroscopy and gamma-ray tracking.

Global Trigger and Readout System for the AGATA experiment

AGATA is a 4-pi array of HP-Ge detectors for in-beam gamma-ray spectroscopy based on the novel concepts of pulse shape analysis (PSA) and gamma-ray tracking. Tracking and PSA require the concurrent digitization -at a sampling rate of 100 Msamples/s -of preamplifier signals of the 36-fold segmented Ge crystals composing the array. Locally digitized data are optically transferred to remote pre-processing nodes for pulse energy computation. The design of the front-end readout and level-1 (L1) trigger in AGATA follows a synchronous pipeline model: the detector data are stored in pipeline buffers at the global AGATA frequency, waiting the global L1 decision. A global timing system provides a reference clock and time tag to the digitizers and the pre-processing units by means of a tree of optically connected timing units. Pre-processing nodes are integrated in ATCA-based carrier cards with full mesh connectivity in the backplane and read-out through pci-express based optical links. Front-end data readout and its integration with the global trigger and synchronization system will be described.

Performance of the Fully Digital FPGA-Based Front-End Electronics for the GALILEO Array

In this work we present the architecture and results of a fully digital Front End Electronics (FEE) read out system developed for the GALILEO array. The FEE system, developed in collaboration with the Advanced Gamma Tracking Array (AGATA) collaboration, is composed of three main blocks: preamplifiers, digitizers and preprocessing electronics. The slow control system contains a custom Linux driver, a dynamic library and a server implementing network services. This work presents the first results of the digital FEE system coupled with a GALILEO germanium detector, which has demonstrated the capability to achieve an energy resolution of 1.530/00 at an energy of 1.33 MeV, similar to the one obtained with a conventional analog system. While keeping a good performance in terms of energy resolution, digital electronics will allow to instrument the full GALILEO array with a versatile system with high integration and low power consumption and costs.

Gamma-ray tracking with the MARS detector

Abstract.The feasibility of the entire process of

Development of the control card for the digitizers of the second generation electronics of AGATA

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Gamma-ray Tracking with Segmented HPGe Detectors

-ray tracking is demonstrated experimentally for the first time. The accuracy of the results is tested by the capability for Doppler correction of

Gamma‐ray Tracking With The MARS Detector

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A PCI Express optical link based on low-cost transceivers qualified for radiation hardness

-rays emitted in flight. The resolution of the 847.8 keV (