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Experimental part:

INTAS Ref. # 03-54-3588 Experimental and Theoretical Study of Energy Deposition and Residual Activation Induced by Uranium Ions to Model the Beam Loss Hazards in the GSI Future Facility. GSI, Darmstadt - Germany ITEP, Moscow - Russia VNIIEF, Sarov - Russia INR RAS, Troizk - Russia

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Experimental part:

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  1. INTAS Ref. # 03-54-3588Experimental and Theoretical Study of Energy Deposition and Residual Activation Induced by Uranium Ions to Model the Beam Loss Hazards in the GSI Future Facility GSI, Darmstadt - Germany ITEP, Moscow - Russia VNIIEF, Sarov - Russia INR RAS, Troizk - Russia SUT, Bratislava - Slovakia • Experimental part: • Measurement the energy deposition profile for U ions with energies E=100 MeV/u - 1 GeV/u in iron and copper. • Measurement the residual activation doses induced by U ions of energies E=100MeV/u - 1 GeV/u in iron and copper targets. A.Golubev Project Meeting GSI 01.06.04.

  2. "Thick target" approach for precise measurement of energy deposition profile dE/dx and total stopping range Why need to use ‘thick target’ approach for measurement of total ion energy deposition ranges in solids Because: it provides direct measurement of the energy deposition range, rather than its reconstruction from measured differential energy loss; it enables to eliminate the ‘edge effects’, as compared to ‘thin foil’ approach; it takes account of the beam straggling and fragmentation, secondary particles etc. • This method using thick targets of variable thickness, determined with high precision and registration of the energy deposition along the total ion stopping range by thin calorimeters detectors • The precision of the method is determined by the detector parameters (energy resolution, registration efficiency, detection threshold, etc. depending on a detector type) the precision of the target thickness measurement. This method has been developed in collaboration between ITEP, VNIIEF and GSI. GSI experiment S249.

  3. Scheme of the experimental setup

  4. Cave A experimental area

  5. Calorimeter The calorimeter measures the change of temperature in a thin layer of material due to its heating by the passing ion beam. The calorimeter is enclosed in a metal case and consists of a receiving platform made of a foil attached to thermo-modules, which are fixed on a massive thermostat. The size of the device is Ø50x11mm. The aperture of the calorimeter is Ø15 mm. The detector sensitivity is 5mV/J. The total stopping range is thus measured with the error less than 3%. The error of the specific deposited energy measurement is 7%.

  6. Experimental investigation of the radioactivity of the solid matter induced by heavy ion beam irradiation Main topics of this research • characterization of residual activity of selected components of the beam line (copper and stainless steel): • dose rate measurements • radioactive nuclides identification for the thick copper and stainless steel targets irradiated by the U beam with 100 – 1000 MeV/u energies range; • long time prediction of radioactive inventory around the beam transport system

  7. Experimental setup for the measurements of induced radioactivity after irradiation with heavy ion beams

  8. Experimental procedure for the measurements of radioactivity induced in Copper and Stainless Steel by fast Uranium ions *Ranges were calculated with taking into account the energy losses in SEETRAM, 100 m Al window, and in 65 cm air; ** Preliminary estimated results *Ranges were calculated with taking into account the energy losses in SEETRAM, 100 m Al window, and in 65 cm air; ** Preliminary estimated results

  9. Results of calibration of beam current detector by different ion beams

  10. Targets for the Argon beam irradiation Ionization chamber Al 100 m 50 mm Target 600 mm Ar Beam Vacuum Air Secondary electron monitor “front“ surface (foil 0) The one-millimeter foils were inserted after each thick disk, which allowed to obtained the spatial distribution of the activation rates in the copper target along the range. Besides that, the radionuclide spectra measurements were carried out for assembling. Based on these experimental data the predictions of the induced radioactivity of the accelerator equipment will made for continuous irradiation during normal operation.

  11. Spatial distribution of activation rates of different nuclides in the copper target after 40Ar E0=800MeV/u irradiation.

  12. Conclusion. • Measurement the energy deposition profile for U ions with energiesE=100 MeV/u - 1 GeV/u in iron and copper are finished and the stage of processing data now • Measurement the residual activation doses induced by U ions of energies E=100MeV/u - 1 GeV/u in iron and copper targets are started.

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