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MOXAB101 |
ADS Programme and Key Technology R&D in China |
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- W.-L. Zhan
IMP, Lanzhou, People's Republic of China
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Along with the rapid development of nuclear power plants in China, treatment of the nuclear waste has become a crucial issue. The roadmap of the nuclear transmutation with accelerator driven subcritical system (ADS) towards its demo in 2032 is set up in China. This presentation should first review world-wide ADS development, status and challenge, and then focus on the Chinese ADS program, roadmap and key technology R&D.
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Slides MOXAB101 [17.461 MB]
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| THPWA002 |
Optimization of the Photoneutron Flux Emitted by an Electron Accelerator for Neutron Interrogation Applications using MCNPX and TRIPOLI-4 Monte Carlo Codes |
3630 |
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- A. Sari, F. Carrel
CEA/DRT/LIST, Gif-sur-Yvette Cedex, France
- C. Jouanne, A. Lyoussi, O. Petit
CEA, Gif-sur-Yvette, France
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Various applications require neutron interrogation to detect special nuclear material. In a previous study*, we demonstrated the feasibility of this technique using the photoneutron flux emitted by a 16 MeV linear electron accelerator. This approach enables to reach average emission intensity on the order of one decade beyond the one produced by deuterium-tritium neutron generators traditionally used for such applications. Higher average emission intensities of the photoneutron flux would enable to expand boundaries of neutron interrogation. This new study aims at optimizing the photoneutron flux emitted by an electron accelerator. In order to ensure accuracy and reliability of our results, two Monte Carlo particle transport codes were used in parallel in this study: MCNPX developed by Los Alamos National Laboratory, and TRIPOLI-4 developed by the French Alternative Energies and Atomic Energy Commission. Potential discrepancies between results obtained with the two codes were investigated. Furthermore, careful attention was given to minimize the high-energy photon beam contained in the photoneutron flux in order to reduce spurious photofission reactions during measurements.
*A. Sari et al., IEEE Trans. Nucl. Sci., vol. 59, no.3, pp. 605-611, 2012.
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| THPWA013 |
Direct Diagnostic Technique of High-intensity Laser Profile based on Laser-Compton Scattering |
3657 |
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- Y. Yoshida, A. Endo, K. Sakaue, R. Sato, M. Washio
Waseda University, Tokyo, Japan
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Funding: Work supported by NEDO (New Energy and Industrial Technology Development Organization).
A high-intensity laser is essential for the LPP (Laser Produced Plasma) EUV generation, which is studied as the next generation light source of ultra-fine semiconductor lithography. Nevertheless, there is no way to directly measure the profile of high-intensity laser. Therefore, we have been developing a method for measuring high-intensity laser profile based on the laser-Compton scattering using a Cs-Te photo cathode RF-Gun at Waseda University. In this diagnostic technique, laser profile is obtained by scanning the extremely-focused electron beam, which is about 10μm by solenoid lens. We have obtained the 10μm beam size by solenoid lens using tracking code GPT (General Particle Tracer) by optimizing the beam parameter and lens shape. Recently, we have installed solenoid lens and generated focused beam. The focused beam size was evaluated by using radiochromic film called GAFCHROMIC dosimetry film type HD-810. In this conference, we will report the results of GPT simulations, beam size measurements and future prospects.
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| THPWA021 |
Studies of Density Distribution and Emittance Measurement for High Current Electronic Beam |
3672 |
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- Q.C. Li, Z.-F. He, J.M. Huang, D.M. Li, Y.-T. Zhang, X.K. Zhu
SINAP, Shanghai, People's Republic of China
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Beam density distribution and emittance are the important parameters of an accelerator. The accurate emittance measurement has an important reference significance for the design of accelerating tube, and provides a design basis for the aperture size of accelerating tube. This paper introduces a beam measurement method which uses multiwire, can rotate in the horizontal plane and adjust in the Z coordinate. The results of simulation show that this method can accurately measure the beam density distribution and emittance, and the accuracy can meet the requirements of applied accelerator.
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| THPWA022 |
An 800kV 30mA Line-Frequency Cockcroft-Walton Dc Generator Using Gas Insulated Transformer for Radiation Application |
3675 |
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- Y.H. Liu, H.L. Guo, Z.-F. He, D.M. Li, M.X. Li, W.G. Shi, H.J. Su, S.L. Wang, Y.J. Yang, J.L. Zhang, Y.-T. Zhang
SINAP, Shanghai, People's Republic of China
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The design and construction of a line-frequency 800 kV Cockcroft-Walton DC generator using gas insulated transformers are described, as well as the motive to develop it into radiation application. Several features are underlined, preliminary test results of the prototype presented and some problems encountered discussed.
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| THPWA023 |
Research on Modeling of the High-density Current Electron Gun System Based on T-S Fuzzy Model |
3678 |
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- B. Lv, D.M. Li, H.J. Su
SINAP, Shanghai, People's Republic of China
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Abstract: The stability of the electron beam is considered as an important performance of industrial electron accelerators. For the beam control system of the accelerator, it is significant to obtain the accurate model of the electron gun system. The paper presents a fuzzy modeling method based on the Takagi-Sugeno (T-S) fuzzy model. A T-S model can be obtained using the system identification algorithms from input-output data. In our approach, fuzzy c-means (FCM) clustering algorithm is applied to identify the model structure. And a hybrid method based on quantum-inspired differential evolution algorithm (QDE) and genetic algorithm (GA) is proposed to learn the parameters of T-S fuzzy model. Experiments on the Box-Jenkins gas furnace data have verified the validity of the modeling approach. The simulation results show that the T-S fuzzy model is very well to describe the electron gun system and reveal its performance.
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| THPWA027 |
Evaluation of Zero-failure Data in Transient Ionizing Radiation Based on Ordering Method in the Sample Space |
3681 |
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- X.Y. Bai, X.M. Jin, R.B. Li, Y. Liu, Q. Ma, Ch. Qi
NINT, Xi'an, People's Republic of China
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The conventional method for the evaluation of data in lot acceptance testing (LAT) of transient ionizing radiation is non-parametric method. But the evaluation results are very conservative. After the discovery of data in transient ionizing radiation belonging to one universal data model “case 1 interval censored data”, ordering method in the sample space was introduced and applied to evaluate zero-failure data and was compared with non-parametric method both theoretically and via a practical LAT on QG-Ⅰ. Through the comparisons, it is concluded that ordering method can expand the scope of dose rate corresponding to the same lower confidence limit. It improves data utilization and this improvement could have practical significance in LAT. It can reduce requirements for the radiation source and can also reduce the number of trials.
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| THPWA028 |
Analysis of Uncertainty of Dose Rate Measurement on the Accelerator “QiangGuang-I” |
3684 |
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- R.B. Li, X.Y. Bai, X.M. Jin, Q. Ma, C. Qi, G.Z. Wang
NINT, Xi'an, People's Republic of China
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“QiangGuang-I”, working on short pulse state, can be used to research the transient radiation effects on electronic devices. The measurement of dose rate is significant for assessing devices’ radiation-resistant ability. This paper comprehensively analyzes the originations of uncertainty on dose rate’s measurement, such as thermoluminescent dosemeter’s linearity degree and response to X-rays energy spectrum, testing instruments’ resolution, waveforms’ transmission distortion , and positional error; figures out the extended uncertainty. The result shows that the expanded uncertainty of dose rate’s measurement is less than 20%, which is satisfactory for researching on devices’ transient radiation effects, and proves that the method used to measure dose rate is reasonable.
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| THPWA029 |
Transient Ionizing Radiation Effect of Bipolar Operational Amplifiers to Pulsed X-rays |
3687 |
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- X.M. Jin
Xiaoming Jin, People's Republic of China
- X.Y. Bai, R.B. Li, D.S. Lin, Q. Ma, C. Qi, G.Z. Wang, S.C. Yang
NINT, Xi'an, People's Republic of China
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Abstract – The pulsed ionizing radiation effect of monolithic operational amplifiers is investigated using a flash X-ray facility. The experimental results show that the pulsed ionizing radiation produces voltage surges in the devices and the output voltage recovers linearly after transient disturbance which includes a negative peak and a positive peak. The recovery time depends on the amplitude of the positive peak and the inherent slew rate of the devices. The degradation of transient disturbance amplitude and the recovery time versus ionizing dose rate of pulsed X-rays is researched. The relationship of circuit effects to physical mechanisms is investigated in detail. The photocurrent induced by transient ionizing radiation in the PN junctions in integrated circuits is responsible for the electrical degradation. Keywords – Transient ionizing Radiation effect, Transient disturbance, Photocurrent, integrated circuits
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| THPWA032 |
Fields of Charged Particle Bunches in Chiral Isotropic Medium |
3696 |
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- S.N. Galyamin, A.A. Peshkov, A.V. Tyukhtin
Saint-Petersburg State University, Russia
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Funding: Work is supported by Russian Foundation for Basic Research and the Dmitry Zimin "Dynasty" Foundation.
We study electromagnetic fields produced by charged particle bunches moving in a chiral isotropic medium. Such properties are typical for most of organic matters and some artificial materials (metamaterials). Therefore, this subject is of interest for chemical, biological, and medical applications as well as for study of metamaterials. First, we investigate in detail the field of a point charge. We obtain exact and approximate formulas and develop algorithm for calculation of the point charge field. Further, we use these expressions for calculation of fields produced by finite size bunches. We also present the typical energetic patterns of radiation and spectra of energy losses. Possibilities of using the obtained results for different applications are discussed.
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| THPWA035 |
Intervention Management from Operation to Shutdown |
3705 |
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- C. Garino, B. Daudin, J. De Jonghe, A. Dorsival, F. B. Dos Santos Pedrosa, G. Dumont, K. Foraz, E.R.F. Reguero Fuentes
CERN, Geneva, Switzerland
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The Intervention Management Planning and Coordination Tool (IMPACT) is now widely used in all the accelerator complex and beyond. This unique repository improves the availability of the intervention information for all facilities, and enhances its traceability. It supports a standardized approval workflow and direct link to the access system for improved control and productivity. IMPACT currently has 1418 active users who have defined 6880 intervention requests in 2012 so far. In 2013, the CERN Accelerator complex will enter a shutdown mode after a long period of operation. Careful preparation and scheduling of activities is paramount in order to keep the shutdown as short as possible, whilst guaranteeing safety. During execution, strict control of access will be enforced considering the radiation levels. This paper will summarize the main improvements to IMPACT in this context: work dose planning with respect to ALARA principles including integration with the operational dosimetry system and automatic generation of safety documents from intervention data.
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| THPWA038 |
GEANT4 Studies of Magnets Activation in the HEBT Line for the European Spallation Source |
3714 |
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- C. Bungau, R.J. Barlow, A. Bungau, R. Cywinski, T.R. Edgecock
University of Huddersfield, Huddersfield, United Kingdom
- P. Carlsson, H. Danared, F. Mezei
ESS, Lund, Sweden
- A.I.S. Holm, S.P. Møller, H.D. Thomsen
ISA, Aarhus, Denmark
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The High Energy Beam Transport (HEBT) line for the European Spallation Source is designed to transport the beam from the underground linac to the target at the surface level while keeping the beam losses small and providing the requested beam footprint and profile on the target. This paper presents activation studies of the magnets in the HEBT line due to backscattered neutrons from the target and beam interactions inside the collimators producing unstable isotopes.
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| THPWA051 |
Compact, Inexpensive X-band Linacs as Radioactive Isotope Source Replacements |
3746 |
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- S. Boucher, R.B. Agustsson, L. Faillace, J.J. Hartzell, A.Y. Murokh, A.V. Smirnov, S. Storms, K.E. Woods
RadiaBeam, Santa Monica, USA
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Funding: Work supported by DNDO Phase II SBIR HSHQDC-10-C-00148 and DOE Phase II SBIR DE- SC0000865.
Radioisotope sources are commonly used in a variety of industrial and medical applications. The US National Research Council has identified as a priority the replacement of high-activity sources with alternative technologies, due to the risk of accidents and diversion by terrorists for use in Radiological Dispersal Devices (“dirty bombs”). RadiaBeam Technologies is developing novel, compact, inexpensive linear accelerators for use in a variety of such applications as cost-effective replacements. The technology is based on the MicroLinac (originally developed at SLAC), an X-band linear accelerator powered by an inexpensive and commonly available magnetron. Prototypes are currently under construction. This paper will describe the design, engineering, fabrication and testing of these linacs at RadiaBeam. Future development plans will also be discussed.
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