SVIBOR - Project code: 1-03-110

MINISTRY OF SCIENCE AND TECHNOLOGY

Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69
E-mail: ured@znanost.hr

SVIBOR

SVIBOR - Collecting Data on Projects in Croatia

Project code: 1-03-110


QUANTUM PROCESSES INDUCED BY SUBMEV PARTICLE BEAM


Main researcher: TUDORIĆ-GHEMO, JOSIP (80622)


Assistants
Type of research: basic
Duration from: 01/01/91. to 12/31/95.
Papers on project (total): 33
Papers on project quoted in Current Contents: 4
Institution name: Fakultet elektrotehnike,strojarstva i brodogradnje, Split (23)
Department/Institute: FESB - Department of Mathematics and Physics Physics Department Physics Research Laboratory
Address: Ulica Ruđera Boškovića bb
City: 21000 - Split, Croatia
Communication
Phone: 385 (0)21 563-777
Fax: 385 (0)21 563-877
E-mail: ghemo@fesb.hr
E-mail: ngod@fesb.hr
E-mail: sury@fesb.hr
E-mail: puljak@fesb.hr
Summary: The research deals with the implementation of the necessary infrastructure for adoption of the new processing material technologies and the development of the ionization radiation measuring systems. On the basis of the our own mechanical and electrical innovations in the design of the Van de Graaff accelerator, the submev ion beam is implemented. The ion beam implementation permitted the preliminary researches of the proton implantation into thin film semiconductors (TiO2). The results of the two-photon inner-shell transitions in xenon atoms and the comparative analysis of the measured results and the theoretical predictions are presented. The environmental pollution of the Dalmatian region is monitored simltaneously, and the development of the X-spectrometry analysis methods and radiological monitoring based on the electron bremsstrahlung detection was very intensive. The multicriterial analysis for the estimating environmental pollution as a basis for DSS (Decision System Support) is considered. Research activity on this Project has been observed and it has been proposed that FESB, University of Split should become a candidate for a member of CMS Collaboration - LHC - CERN, Geneva. By the end of 1993 the collaboration was established on the energy resolution program of the prototype Shashlik calorimeter. The collaboration was successful and the CERN provided the financial support for 6 man - months during 1994. This collaboration provides an opportunity for the fundamental and applied physics research at the University of Split to reach the highest international level. In that sense during 1994 and 1995 the main part of our scientific activities was based on the CMS experimental programme. The field of our activities in the CMS programme has enlarged. During 1994 the energy response uniformity, the shower barycentre space resolution and the two shower separation have been studied. It has been found that the multibundle Shashlik prototype has significantly improved performances. Effects of radiation damage on the Shashlik detector have also been studied, and it has been found that the damage profile follows closely the shower profile. Influence of magnetic field on Shashlik response has been tested, and the known effect of response increasing for 11% at 3 T magnetic field is confirmed, without significant deterioration of energy resolution. Parallelly, the advantages of the scintillation crystals CeF3 and PbWO4 in electromagnetic calorimeter construction have been studied. Both crystals have better resolution than Shashlik. Especially the CeF3 has a good energy resolution, but since it is expensive further investigations are oriented to the PbWO4 properties. During 1995 the light yield dependence on temperature has been studied in detail, as well as the energy resolution dependence on different photodevices. Slightly undesirable temperature dependence has been found, and the aplication of APD (avalanche photodiode) requires further development. The radiation damage problem requires the experimental simulation of the real dose rate at LHC and a detailed study of crystal behavior under the given conditions. It is expected that CERN will offer the performance of such experiments to our group. This can serve as a confirmation of the positive reviewing of FESB - Split collaboration with CERN - Geneva. At the same time, the work on the enviroment pollution monitoring problems has continued. A drop of metal concetration in waste water in southern catchments area of Split in the 1991-1993 period was found. In that period, due to the war events, almost the entire industry was stagnant. For the requirements of health services, the ecological data base system has been designed. For the radiological monitoring purposes, the shield from natural radiation has been built for the detector during the electron bremsstrahlung measurements from the pure beta-radionuclids.

Keywords: summev ion beam, ionization radiation detector, X-spectrometry, bremsstrahlung radiation, radiological monitoring, ecosystem monitoring, CMS programm, Shashlik detector, PbWO4 crystal

Research goals: The main aim: to develop fundamental and applied experimentalresearch in physics at Split University to the level required forcollaboration with the international physics centers. The main aim includes the following three activities: 1) to get 500keV Van de Graaff accelerator in function for the submev ion beam implementation; 2) to develop new detection methods and measuring systems for ionization radiation in order to establish the workstation for sample compositions analysis and ecosystem monitoring, simultaneously to monitor ecosystem pollution of the region by the classical methods; 3) to intensify participation of physicists from the University of Split in the international research project of SM Higgs bozon detection under the CMS collaboration at CERN-Geneva. Expected results: 1) submev ion beam provides fundamental (the radiative proton capture by light nuclei) and applied (the material surface processing) experimental researches in physics at present scientific level; 2) laboratory workstation for the sample compositions analysis and ecosystem monitoring will rise the level of Adriatic coast ecosystem protection; 3) the new information about quantum structure and quantum processes of the matter; 4) organization of the high-level scientific laboratory exercises as a part ofthe undergraduate and graduate student education at the University of Split (physics, technology, ecology, computer science).

COOPERATION - PROJECTS


  1. Name of project: RD-CMS-LHC-CERN Performances of the Electromagnetic Calorimeter and the Corresponding Simulationes Studies
    Name of institution: CERN - European Laboratory for Particle Physics
    City: 1211 - Geneva 23, CH

COOPERATION - INSTITUTIONS


  1. Name of institution: CERN - European Laboratory for Particle Physics LHC - The Large Hadron Collider - Collaboration CMS - The Compact Muon Solenoid - Collaboration
    Type of institution: International organization
    Type of cooperation: Systematic exchange of experts
    City: 1211 - Geneva 23, CH

  2. Name of institution: Institut "Ruđer Bošković", Odjel Fizika, Zavod EF, Zavod IME
    Type of institution: State institute
    Type of cooperation: Joint publishing of scientific papers
    City: 10000 - Zagreb, Croatia

  3. Name of institution: Prirodoslovno Matematički Fakultet, Sveučilište u Zagrebu, Fizički odjel
    Type of institution: University/Faculty
    Type of cooperation: Joint publishing of scientific papers
    City: 10000 - Zagreb, Croatia

OTHER ACHIEVEMENTS


  1. Name: Konstrukcija i izrada nekontaminiranog željeznog oklopa detektora za zaštitu od prirodnog radioaktivnog zračenja
    Type of achievement: Other
    Authors: Godinović N., Mađor S., Sorić I., Tudorić-Ghemo J.
Other information about the project.
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