| Paper | Title | Page |
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| TUPSA45 | Provision of Dose Homogeneity in Experiments for Developing Methods of Food Irradiation | 236 |
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| At present, interest is growing in the use of an electron beam irradiation for preserving food, which is a more efficient technology than gamma irradiation. This technology has long been applied to the disinfection of dry products having a low density. When processing objects having a density comparable to that of water, an inhomogeneous radiation dose profile may arise due to the insufficient penetrating power of the electron beam. This makes difficult to conduct correct studies. In IPCE RAS the research on the irradiation of food products and test tubes with model media on a radiation installation based on the UELV-10-10-C-70 accelerator with electron energy of 6-10 MeV is carried out. The sizes of irradiated objects often do not allow making an unambiguous conclusion about the uniformity of radiation doses in experiments. In order to find the distribution profile of doses in the objects of the study, the irradiation process is modeled using a specially modified computer code "BEAM SCANNING". In this program, the object is specified as the combination of primitive forms - a cone, a cylinder, a rectangle and a sphere, which is enough for modeling typical forms of objects, used in experiments. Calculations for cylinders and spheres simulating experimental objects-test tubes with model media and spherical products have been performed. The distributions of radiation doses in this objects are presented, methods for increasing the dose homogeneity in experiments are proposed. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-RUPAC2018-TUPSA45 | |
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WEPSB15 |
Correction of Scanning System Deflecting Magnet Steel Core Hysteresys on UELV-10-10-S-70 Accelerator | |
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| In radiation technologies, an electron beam is distributed in space by the deflecting magnets of the beam scanning system. The deflecting magnets always contain a ferromagnetic yoke, which is under the influence of alternating magnetic fields. A characteristic feature of ferromagnets in alternating fields is the existence of a hysteresis loop that affects the dependence of the effective magnetic field on time, and accordingly on the beam distribution in space and on the uniformity of irradiation dose. Depending on the process conditions, the hysteresis can have both a useful effect, which increases the uniformity of the distribution of dose fields and detrimental, which decreases the dose uniformity and erodes the units of the installation. The effect of the influence of hysteresis in the yoke of the scanning system deflecting magnet of the accelerator UELV-10-10-S-70 at IPCE RAS was studied. The negative influence of hysteresis was manifested in local overheating of the output foil and a decrease of beam utilization efficiency. Computer simulation of the scanning process with hysteresis was carried out using the computer code "Beam Scanning". Methods for eliminating the negative influence of hysteresis and optimizing the scanning system by selecting the steel grade of the magnetic yoke and changing the shape of the magnet current curve are proposed. These methods are implemented on an accelerator at IPCE RAS. | ||
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| THPSC33 | Radiation Installation and Accelerator UELV-10-10-C-70 Beam Parameters Control, Management and Registration System | 472 |
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| Irradiation of medical products on radiation installations based on electron beam is a responsible task. To increase the quality of irradiation, continuous monitoring of the installation operation is necessary. The design of the system for monitoring and recording parameters of a radiation-technological installation based on the UELV-10-10-C-70 accelerator at IPCE RAS is presented. The monitoring system collects data in real time with number of sensors and performs its analysis and registration, informs about errors and stops the irradiation process in emergency situations. A simple solution for transferring data from sensors to a computer, which traditionally remains a bottleneck in technology, is proposed. An important task of the control system is to determine the parameters of the accelerator beam, such as pulse current and energy spectrum. Various methods, based on simple equipment, for determining the energy spectrum of accelerator beam, which can be used for continuous monitoring without interrupting the production process, are proposed. A computational model is developed for processing the results of measurements in these methods, using the computer code "Beam Scanning". In current version of the system the data about the conveyor movement, scanning system deflecting magnet current and accelerator state is collected. The beam spectrum sensor based on the Faraday cylinder is in the process of development. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-RUPAC2018-THPSC33 | |
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