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| WEPSB039 | New Techniques for Operation and Diagnostics of Relativistic Electron Coolers | electron, laser, solenoid, scattering | 449 |
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| The Helmholtz Institut Mainz (HIM) performs experiments related to possible improvements of high-energy d.c.-electron coolers. Results and activities concerning non-invasive beam diagnostics and beam control at large operating currents will be shown. Furthermore, progress of our project to use turbo generators as a means for potential-free power generation in high-energy electron coolers is presented. | |||
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| WEPSB048 | Beam Shaping Assembly Optimization for Boron Neutron Capture Therapy | neutron, proton, simulation, target | 471 |
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| Epithermal neutron source, based on vacuum insulation tandem accelerator and lithium target, has been developed and is now in use in the Budker Institute of Nuclear Physics. Neutrons are generated in 7Li(p, n)7Be reaction under proton energies from 2 to 2.5 MeV. A beam shaping assembly (BSA) for therapeutic neutron beam forming is used. It includes moderator, reflector, and absorber. In this work the simulation results of the depth dose rate distribution in modified Snyder head phantom for a range of neutron energies are presented and discussed. Variants of BSA optimization depending on tumor depth are proposed. The calculations were carried out by Monte-Carlo neutron and photon transport code NMC. Our research revealed that high quality neutron beam generation may be obtained with proton energy of 2.3 MeV. Discovered optimal schemes of BSA including sizes and materials are presented and discussed. | |||
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| WEPSB051 | Mathematical and Computer Methods of Data Processing in Nuclear Medicine Studies | software, detector, GPU, experiment | 480 |
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| Currently nuclear medicine is a high-tech field. Its development requires solutions of problems related both to the improvement of hardware and computer processing of the information obtained in the course of study. The basic types of hardware of nuclear medicine are gamma cameras and single photon emission computed tomography (SPECT), positron emission tomography (PET) and hybrid scanners (SPECT/CT, PET/ CT). The methods of SPECT data processing include analysis of static, dynamic, tomographic and ECG-gated images. The PET data reconstruction software restores the three-dimensional distribution of the radiopharmaceutical in the body. Performance of iterative methods increases with the use of modern graphics processors. Three-dimensional imaging allows a detailed analysis of the study area. The software also implements a fusion imaging of SPECT/CT, PET/CT scans performed in the same coordinate system. An application of data flow model in medical software development is considered. Web-based imaging front-end of storage and processing system is presented. | |||
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| THPSC017 | A Synchrotron Radiation Beamline Installed at BINP to Study the High Luminosity LHC Vacuum System | electron, vacuum, radiation, synchrotron | 572 |
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| In the framework of the HL-LHC project, the vacuum performance of new surface material needs to be studied. In particular, a-C coating is proposed as an anti-multipactor surface in the HL-LHC Inner Triplets. Since the protons in the HL-LHC Inner Triplets will generate synchrotron radiation (SR) with ~ 10 eV critical energy and ~ 1016 ph/m/s flux, it is therefore of great importance to study the impact of such photons on a-C coating held at room and cryogenic temperature and compare the results against present LHC material. This paper describes construction and parameters of experimental set-up based on new Synchrotron Radiation beamline from booster synchrotron BEP at BINP. The experimental program releasing in collaboration between CERN and BINP for performing measurements of photon stimulated gas desorption, photon distribution and photo-electron emission provoked by synchrotron radiation are presented | |||
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| THPSC048 | Measurement of Gamma Beams Profile by Cherenkov Radiation in Fibers | radiation, experiment, betatron, electron | 638 |
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Funding: This work was partially supported by the Russian Ministry of Education and Science within the program 'Nauka' Grant 3.709.2014/K and by RFBR Grant 15-52-50028-YaFa. Results of gamma beam profile experimental investigations by measuring of Cherenkov radiation* generated in a fiber with 0.6 mm thickness and in a glass rod with 5 mm diameter are presented. These experiments were carried out on bremsstrahlung beam of the linear accelerator 'Philips SL-75' with 6 MeV energy and 4 Gr/min dose rate at 1 m distance. In works ** and *** authors have showed feasibility of Cherenkov radiation applying for high energy beam diagnostics. In our work the Cherenkov radiation yield dependence on the fiber orientation relative to the beam axis was investigated and showed that the maximal light yield corresponds to the angle between fiber and beam axes closed to the Cherenkov angle. When dose rate is higher than 1 Gr/min at 1 m distance one can register a light yield for the fiber orientation even less than Cherenkov angle. We suppose that the observed effect is connected with generating of electromagnetic shower by initial photons. Proposed technique of bremsstrahlung and electron **** beams profile measurements differs from well-known techniques based on ionization chambers due to its insensitive to low energy part of the bremsstrahlung spectrum and to undesirable background. Using this technique for beam profile scanning it is possible to construct compact and noise insensitive device relative to the well-known systems. It is also possible to reach submillimeter resolution with this device. * Jelley J V, Cherenkov Radiation and its Application, 1958, Pergamon Press. ** Wulf F, Korfer M, Proc. of DIPAC 2009, p. 411. *** A. Murokh, R. Agustsson etc., Proc of IPAC2012, p.996. **** A V Vukolov, A I Novokshonov, A P Potylitsyn, S R Uglov, Proc of RREPS-15, 2015, Sain-Petersburg |
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| THPSC065 | Diagnostics of Accelerator Beams by the Dependence of the Vavilov-Cherenkov Radiation Intensity on the Refractive Index of the Radiator "n" | electron, detector, radiation, microtron | 686 |
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The report presents the results of development the method TLSH* for finding of the particle speed distribution (PSD) in beams of accelerators. PSD is deduced from the Volterra integral equation of the first kind with the right part, which is by the dependence of Cherenkov radiation intensity (ChRI) from n, experimentally obtained for the given beam. PSD is the second derivative of ChRI. The problem of stability of the second derivative is solved by attracting the priori information (for example, nonnegative of the solution). Using optical dispersion of radiator is discussed. It enables to find PSD even in the single cluster of particles. The possibility of determining the PSD in the cross section beam is discussed too. The method also enables to find PSD upon a noticeable transverse speed of the particles in the beam. The method is virtually non-destructive in many cases.
*Measurement of the distributions of particle velocity in the accelerator beam on the basis of the Vavilov-Cherenkov radiation at optical and microwave ranges. Trukhanov K. A., Larkin A. I., Shvedunov V. I. Izv. RAS. Ser. Phys. 2010. V. 74, No. 11, Pp. 1665-1668. |
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