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Elaboration of Scincillator Technology

#1414


Optimisation of the Technology, Production and Investigation of Scintillation Tiles

Tech Area / Field

  • MAN-MAT/Engineering Materials/Manufacturing Technology
  • INS-DET/Detection Devices/Instrumentation

Status
3 Approved without Funding

Registration date
30.11.1998

Leading Institute
Institute for High Energy Physics (IHEP), Russia, Moscow reg., Protvino

Supporting institutes

  • NPO Lutch, Russia, Moscow reg., Podolsk\nVNIIKhT (Chemical Technology), Russia, Moscow

Collaborators

  • CERN, Switzerland, Geneva\nLaboratorio de Instrumentacao e Fisica Experimental de Particulas, Portugal, Lisbon

Project summary

This Project is an extension and prolongation of the ISTC Project 515-96. The main goal of ISTC Project 515-96 was the development of technology for production of high quality scintillators by injection molding techniques. The goals of this project were reached successfully. The workshop for scintillator production has been constructed, the scintillating tiles of good optical and mechanical quality have been produced and the optimal base material for big scale production has been found.

The proposed extension aims at construction of scintillators for the large-scale calorimeter on the basis of developed technology and design and construction of the monitoring system for scintillation calorimeters.

Calorimetry plays an increasingly important role in high-energy physics with increasing the energy of particles interaction. At the European Centre for Nuclear Research in Geneva, an international collaboration of physicists is constructing a spectrometer, called Atlas, which includes a hadron calorimeter. This device consists of 460 000 scintillation tiles of 11 sizes with high optical properties and small light yield dispersion of all the elements. We propose to produce a large part of the scintillators for this experimental facility in the framework of an extension of ISTC Project 515-96 and to use this facility for the study of most essential questions of large-scale scintillation calorimetry.

An efficient injection molding technology for the mass production of polystyrene scintillation tiles was developed at the Institute for High Energy Physics (Protvino). This technology will allow us to produce large size tiles with stable light yield and to equip the hadron calorimeter of the Atlas spectrometer. One of the most essential elements in large-scale scintillation calorimetry is the relative and absolute calibration of all elements and continuous monitoring. For the relative calibration of all active elements and for the monitoring of the calorimeter, it is proposed to use a radioactive source moving inside the tube through all the calorimeter cells. A hydraulic drive will be used for the source movement. The electronics of the transportation drive and the software of online data acquisition system will assure a quick and efficient calibration of the calorimeter. The development of the software for the control of the radioactive source speed and for the calculation of each tile response is foreseen.

New generation detectors require a huge amount of scintillators of different shapes with high transparency and uniformity of the light yield. With the experience obtained during the tiles production for the calorimeter prototypes and in the framework of ISTC project 515-96, such ambitious goals can be achieved provided intensive research and development work on the monitoring of the scintillators production process and calorimeter itself. Since the technology of the scintillation tiles production by means of injection molding exists already and the basic principles of monitoring are tested, the authors of the Project are confident of reaching the Project's goals.

Foreign collaborators will participate in the technology development, investigations of the molds and raw materials, in the preprocessing control of the materials used and in the test beam investigations of the calorimeter modules.

The Atlas collaboration has sufficient funding for the purchase of raw materials and practically all the necessary equipment. An optimum use of the ISTC grants will allow former weapons specialists to participate in the construction of the Atlas hadron calorimeter.


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