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Title: AGATA: The European HPGe tracking array

Abstract

The future experiments on {gamma} spectroscopy need more advanced detection techniques than those typically used for stable beams. In fact, very often the studied nucleus is characterized by very high velocity (up to relativistic energy) and the conditions on the background must be very severe. The next generation detector arrays, consequently, require unprecedented levels of efficiency and sensitivity. A completely new technology on {gamma}-rays detection based on digital electronics, electrically segmented HPGe and {gamma}-ray tracking is needed. Monte Carlo simulations suggest that an HPGe array based on such techniques will have a high photopeak efficiency over a broad energy range (larger than 35% for single (1 MeV photons and larger than 20 % for a cascade of 30 photons of {approx} 1 MeV energy), combined with an excellent peak-to-total ratio (of the order of 55%). The European array based on such technology, AGATA, will be briefly presented together with the first in beam tests of segmented detectors.

Authors:
 [1];  [2]
  1. University of Milano, via Celoria 16, 20133 Milan (Italy)
  2. (Italy)
Publication Date:
OSTI Identifier:
21054890
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 884; Journal Issue: 1; Conference: 6. Latin American symposium on nuclear physics and applications, Iguazu (Argentina), 3-7 Oct 2005; Other Information: DOI: 10.1063/1.2710562; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; COMPUTERIZED SIMULATION; EFFICIENCY; GAMMA DETECTION; GAMMA RADIATION; GAMMA SPECTROSCOPY; HIGH-PURITY GE DETECTORS; MEV RANGE; MONTE CARLO METHOD; NUCLEI; PHOTONS; RELATIVISTIC RANGE; SENSITIVITY

Citation Formats

Camera, F., and INFN section of Milano, via Celoria 16, 20133 Milan. AGATA: The European HPGe tracking array. United States: N. p., 2007. Web. doi:10.1063/1.2710562.
Camera, F., & INFN section of Milano, via Celoria 16, 20133 Milan. AGATA: The European HPGe tracking array. United States. doi:10.1063/1.2710562.
Camera, F., and INFN section of Milano, via Celoria 16, 20133 Milan. Mon . "AGATA: The European HPGe tracking array". United States. doi:10.1063/1.2710562.
@article{osti_21054890,
title = {AGATA: The European HPGe tracking array},
author = {Camera, F. and INFN section of Milano, via Celoria 16, 20133 Milan},
abstractNote = {The future experiments on {gamma} spectroscopy need more advanced detection techniques than those typically used for stable beams. In fact, very often the studied nucleus is characterized by very high velocity (up to relativistic energy) and the conditions on the background must be very severe. The next generation detector arrays, consequently, require unprecedented levels of efficiency and sensitivity. A completely new technology on {gamma}-rays detection based on digital electronics, electrically segmented HPGe and {gamma}-ray tracking is needed. Monte Carlo simulations suggest that an HPGe array based on such techniques will have a high photopeak efficiency over a broad energy range (larger than 35% for single (1 MeV photons and larger than 20 % for a cascade of 30 photons of {approx} 1 MeV energy), combined with an excellent peak-to-total ratio (of the order of 55%). The European array based on such technology, AGATA, will be briefly presented together with the first in beam tests of segmented detectors.},
doi = {10.1063/1.2710562},
journal = {AIP Conference Proceedings},
number = 1,
volume = 884,
place = {United States},
year = {Mon Feb 12 00:00:00 EST 2007},
month = {Mon Feb 12 00:00:00 EST 2007}
}
  • The four-year European Gas Turbine Program AGATA was started in January 1993 with the objective of developing three critical components aimed at a 60 kW turbogenerator in an hybrid electric vehicle: a catalytic combustor, a radial turbine wheel and a static heat exchanger. The AGATA partners represent car manufacturers as well as companies and research institutes in the turbine, catalyst, and ceramic material fields in both France and Sweden. This paper outlines the main results of the AGATA project for the first three-year period. Experimental verification of the components started during the third year of the program. A high-pressure/temperature testmore » rig for the combustor and the heat exchanger tests has been built and is now being commissioned. A high-temperature turbine spin rig will be ready late 1995. The turbine wheel design is completed and ceramic Si{sub 3}N{sub 4} spin disks have been manufactured by injection molding and Hot Isostatic Pressing (HIP). A straight blade design has been selected and FEM calculations have indicated that stress levels that occur during a cold start are below 300 MPa. The catalytic combustor final design for full-scale testing has been defined. Due to the high operating temperature, 1350 C, catalyst pilot tests have included aging, activity, and strength tests. Based on these tests, substrate and active materials have been selected. Initial full-scale tests including LDV measurements in the premix duct will start late 1995. The heat exchanger design has also been defined. This is based on a high-efficiency plate recuperator design. One critical item is the ceramic thermoplastic extrusion manufacturing method for the extremely thin exchanger plates another is the bonding technique: ceramic to ceramic and ceramic to metal. significant progress on these two items has been achieved. The manufacturing of quarter scale prototypes is now in process.« less
  • A Monte Carlo code based on the C++ classes of Geant4 has been developed to meet the requirements of the AGATA project, which has the goal to develop an array of highly segmented high-purity germanium detectors based on the novel concepts of pulse shape analysis and {gamma}-ray tracking. The code has been used to optimize the final geometry of the array and to evaluate realistically its performance under a wide range of experimental conditions. Some results of the extensive simulation work are presented here.
  • The goal of the AGATA project is to develop an array of highly segmented high-purity germanium detectors based on the novel concepts of pulse shape analysis and {gamma}-ray tracking. In the initial phase, a smaller Demonstrator Array will be assembled to prove the practical feasibility of these concepts. The Demonstrator Array will be first placed at the Laboratori Nazionali di Legnaro, where it will be coupled with the PRISMA magnetic spectrometer. Some results of the extensive simulation work concerning the Demonstrator Array are presented here.
  • The AGATA Demonstrator Array is presently under installation at Laboratori Nazionali di Legnaro, Italy, where it will replace the CLARA array at the target position of the PRISMA magnetic spectrometer. In the present contribution, the details of the installation will be reviewed. Preliminary results from the first in-beam commissioning test will be given.