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| TUPRI004 | The Design and Implementation of The Radiation Monitors for the Protection of the MICE Tracker Detectors | 1559 |
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| A radiation monitor will be required for the Muon Ionisation Cooling experiment (MICE) beyond Step IV, when the RF cavities are installed. The role of the radiation monitors will be to protect the particle tracking detectors (Trackers) from dangerous levels of RF dark currents and the as- sociated photon fluxes that could potentially be produced in the RF cavities. If such levels of radiation should occur the radiation monitor will ensure that the radiation shields (shutters) are closed thereby protecting the Tracker modules. The radiation monitor will be positioned on these radiation shields and will monitor x-rays, gamma-rays and electrons up to a few MeV. It is expected that the spectrum will peak at very low energies, since the peak voltage across the cavities is 8 MV/m and so the maximum energy that an electron could gain is 12 MeV (maximally accelerated from all four RF cavities). The design, positioning and expected sensitivity of the radiation monitors will be described here along with their readout and inclusion into the MICE interlocking systems. The schedule for the work and progress so far will also be presented. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI004 | |
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| TUPRI039 | Radiation Safety Considerations for Areal Electron Linac With Beam Diagnostic System | 1647 |
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| The AREAL linear accelerator will produce electron beam with 5 MeV energy and further upgrade up to 20 MeV. At the first stage of the operation the construction of the beam diagnostic section of complex shape and layout is planned thus making the radiation source definition difficult. FLUKA particle tracking simulation code was used to calculate produced radiation dose rates and define an appropriate radiation shielding. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI039 | |
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| TUPRI097 | Radiation Protection Concepts for the Beamline for Detector Tests at ELSA | 1799 |
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| At the electron accelerator ELSA, a new external beamline is under construction, whose task is to provide a primary electron beam for detector tests. In the future the accelerator facility will not only be offering an electron beam to the currently implemented photoproduction experiments for hadron physics, but to the new "‘research and technology center detector physics"',whose task is to develop detectors for particle and astroparticle physics. To dump and simultaneously measure the current of the electron beam behind the detector components a Faraday cup consisting of depleted uranium is used. The residual radiation leaving the cup is absorbed in a concrete casing. The radiation protection concept for the entire area of the new beamline was designed with the help of the Monte Carlo simulation program Fluka. In addition the concrete casing, radiation protection walls were taken into account to allow a safe working environment in the room created by the shielding walls. The presentation gives an overview of the different radiation protection concepts for the new beamline for detector tests at ELSA. Furthermore, progresses at the beamline will be reported. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI097 | |
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| TUPRI098 | The New PLC based Radiation Safety Interlock System at S-DALINAC | 1802 |
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Funding: Supported by a HGS-HIRe travel grant The Superconducting Darmstadt Linear Electron Accelerator S-DALINAC has been running since 1991. It consists of an injector linac, a main linac with two recirculations and is mainly used for in-house nuclear physics experiments as well as accelerator physics and technology. Radiation safety regulations demand an interlock system during operation of the accelerator. Amongst other major projects increasing the versatility and operation stability of the S-DALINAC, the existing, hardware based, interlock system is going to be replaced in the next shutdown period. The new interlock system is based on a PLC (Programmable Logic Controller) and will provide two subsystems, a personnel interlock system as well as a machine safety interlock system. Whereas the first subsystem is to protect staff and visitors from being harmed by ionizing radiation, the latter subsystem prohibits the S-DALINAC beam transport and vacuum elements from being damaged due to malfunctioning of any components during accelerator operation. This contribution will give an overview on this new system and will show the latest status. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI098 | |
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| TUPRI099 | A Proton Therapy Test Facility: the Radiation Protection Design | 1805 |
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| A proton therapy test facility with a beam current lower than 10 nA in average, and an energy up to 85 MeV, has to be sited at the Frascati ENEA Research Center, in Italy. The accelerator is composed by a sequence of linear sections. From the radiation protection point of view the source of radiation for this facility is almost completely located at the final target. Physical and geometrical models of the device have been developed and implemented into a radiation transport computer code based on Monte Carlo method. The main scope is the assessment of the dose rates around the radiation source for supporting the safety analysis. For the assessment was used the FLUKA (FLUktuierende KAskade) computer code. A general purpose tool for the calculation of particle transport and interaction with matter, covering an extended range of applications including proton beam analysis. The models implemented into the code are described and the results are presented. The calculated dose rates are reported at different distances from the target. Considerations about personnel safety are issued and the shielding requirements are anticipated. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI099 | |
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| TUPRI100 | Present Status of the Cherenkov Beam Loss Monitor at SACLA | 1808 |
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| Since 2011, high power lasers have been delivered stably to the users at SACLA, the SPring-8 Angstrom compact free electron laser, and the upgrades have been performing to obtain the high quality of the laser continuously. Optical fiber based Cherenkov beam loss monitors have been successfully operated from the commissioning phase. This monitor covers the undulator section of beam lines and the electron beam transporting tunnel from SACLA to SPring-8. This monitor is made good use of not only beam transport but also detection of the small beam loss such as electron halos hitting the magnets of undulator. In this presentation, we will report the present status of the Cherenkov beam loss monitor and its usage experience. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI100 | |
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| TUPRI101 | Measurement of Neutrons Generated by 345MeV/u U-238 Beam at RIKEN RIBF | 1811 |
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| Neutrons generated by a 345 MeV/u uranium beam bombardment on a 3-mm-thick Be target were measured outside the target chamber using activation detectors of bismuth, aluminum and carbon at 60, 70 and 90 degrees from the beam axis. After a few days irradiation, the activation detectors were removed, and the energy spectra of photons from radionuclides generated by reactions of 209Bi(n, xn)210-xBi(x=4~10), 12C(n, 2n)11C and 27Al(n, alpha)24Na were measured using a germanium detector. Photo peak counts of corresponding photon energies were analyzed with considering detector efficiencies and a beam intensity fluctuation during the irradiation. The production rates of the radionuclides were obtained for all reactions. Monte Carlo simulation using the PHITS code was also performed. Fluxes of neutrons at the activation detectors were tallied and the energy spectra were obtained. Production rates of the radionuclides were obtained by folding the thus obtained energy spectra with activation cross section data. Comparisons with the measurements showed agreements within about 60%. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI101 | |
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| TUPRI102 | Intervention Modelling at High-energy Particle Accelerators | 1814 |
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Funding: This research project has been supported by a Marie Curie Fellowship of the European Community’s Seventh Framework Programme under contract number (PITN-GA-2010-264336-PURESAFE). An important aspect in the design and operation of high-energy particle accelerators is the planning of maintenance interventions. In the planning of these interventions, optimizing the exposure of the maintenance workers to ionizing radiation is a core issue. In this context, we have addressed the need for an interactive visual software tool. The intervention planning has been modelled mathematically. A proof-of-concept software tool has been implemented using this model, providing interactive visualization of facilities and radiation levels, tools for trajectory planning and automatic calculation of the expected integrated equivalent radiation dose. We explore the use of the software using a large experimental hall at CERN as a case study. Interactive visualization of the facilities and radiation levels, tools for interactive trajectory planning as well as automatic calculation of the expected integrated equivalent dose contracted during an intervention are explored. The obtained results prove the relevance of the developed methodology and software tool and demonstrate, among others, a better exploitation of the simulation data, leading to a potential accuracy gain. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI102 | |
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| TUPRI103 | Neutronics Analyses to Support Waste Management for SNS | 1817 |
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Funding: Work supported by the Division of Materials Science, U.S. Department of Energy, under contract number DE-AC05-96OR22464 with UT-Battelle Corporation for ORNL According to the Spallation Neutron Source (SNS) operations plan the facility components are replaced, when they reach their end-of-life due to radiation induced material damage or burn-up or because of mechanical failure or design improvements. During operation these components are exposed to a severe radiation environment and builds up significant activity during its service lifetime. These components must be safely removed, placed in a container for storage, and transported from the site. In order to classify components and suggest appropriate shipping container an accurate estimate of the radionuclide inventory is performed. On the base of calculated radionuclide inventory the spent component is classified and appropriate container for transport and storage is suggested. Container it is being modelled with the facility component, placed inside, in order to perform transport calculations to ensure that the container is compliant with the waste management regulations. Dose rate analyses are performed as well for the exposure prediction of personnel during components change out. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI103 | |
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