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Статті в журналах з теми "Accélérateurs linéaires à induction":
Bricq, Michel. "Les accélérateurs linéaires de particules." RBM-News 18, no. 6 (1996): M9—M12. http://dx.doi.org/10.1016/s0222-0776(05)80023-9.
Ba, MB, PM Diéne, M. Mané, FCA Chemega, L. Gueye, F. Nging, and PM Gaye. "55: Implémentation et réalisation de la curiethérapie à haut débit de dose (HDR) au service de Radiothérapie de l’Hôpital Dalal Jamm de Dakar." African Journal of Oncology 2, no. 1 Supplement (March 1, 2022): S24—S25. http://dx.doi.org/10.54266/ajo.2.1s.c55.ymwo4373.
Bakouni, Hamzah, Laurent Elkrief, Sabrina Bijou-Coulon, Maria Eugenia Socias, Bernard Le Foll, Ron Lim, and Didier Jutras-Aswad. "Associations Between Opioid Agonist Treatment and Withdrawal Symptoms: Exploratory Analyses from the OPTIMA Study." Canadian Journal of Addiction 15, no. 1 (March 2024): 6–15. http://dx.doi.org/10.1097/cxa.0000000000000197.
Дисертації з теми "Accélérateurs linéaires à induction":
Alvinerie, Clara-Marie. "Etude numérique et expérimentale de la dynamique des faisceaux d'electrons dans les accélérateurs linéaires à induction." Electronic Thesis or Diss., Normandie, 2023. http://www.theses.fr/2023NORMC291.
Flash radiography allows characterizing the state of a dense object subjected to extreme physical conditions, with displacement velocities of several kilometres per second. These conditions require a specific X-ray source: small size (a few millimetres), brief duration (less than 100 ns), high energy (around 20 MeV) and high current (a few kA). This source is produced using Bremsstrahlung radiation generated by the interaction of an intense and pulsed electron beam with a high atomic number metal target. A velvet cathode emits the beam and an linear induction accelerator (LIA) transports it. The quality of radiography is mainly conditioned by the physical characteristics of the X-ray source, which are closely linked to the properties of the electron beam. The work carried out in this PhD thesis aims to model the beam dynamics in LIAs by integrating its physical characteristics, including some instabilities which degrade the beam. The developed models were validated during the commissioning of the MCH3 accelerator at CEA Valduc in Epure facility.The modelling of beam dynamics is based on the Particle-In-Cell (PIC) code LSP-Slice and the transport code EVOLI (EVOLution of Instabilities). The latter was developed during this thesis and models the size of the beam envelope and its charge centroid, as well as the "temporal" propagation of the beam by its segmentation into discs.In the first place, studies were conducted on the motion of the beam centroid during its transport. In EVOLI, the equations describe the centroid with the influence of space charge. A numerical optimization procedure allowed the simulation to reproduce the results obtained in MCH3 by incorporating the influence of the Earth's magnetic field and the misalignment of various magnetic elements (solenoids and steerers). The application of this new method to other beam transports makes possible to calculate steerer settings for numerical pre-centering of the beam. This method offers the prospect of significant time savings during the experimental beam centering process, which typically requires numerous shots.Afterward the beam modelling contributed to the commissioning of MCH3 accelerator at the end of 2022. With an initial transport attempt, the entire beam charge did not reach the conversion target, despite numerical simulations predicting nominal transport based on the envelope formalism. Experimental measurements revealed significant centroid oscillations due to the Beam Break-Up (BBU) instability. Then, a simplified BBU model was incorporated into EVOLI. By using this numerical model, a new high magnetic field transport was designed, theoretically limiting BBU intensity at the accelerator end by a factor 2.5. This result was experimentally verified by a BBU reduction by a factor 3, enabling a stable and reproducible transport of the entire beam charge to the target. However, this strong magnetic field transport strategy leads to an increase of the Corkscrew motion, which increases with magnetic field strength as shown in the work initiated in this thesis. Therefore, optimizing beam transport is a compromise between the various instabilities within the accelerator. The work of this thesis opens up prospects for considering instabilities to design innovative transports, particularly in the context of multi-pulse machines, which are currently a major development in flash radiography machines
Ruiz, Nicolas. "Etude et réalisation d'un faisceau de positons lents." Paris 6, 2011. http://www.theses.fr/2011PA066643.
Longuevergne, David. "Etude et test d'un module accélérateur supraconducteur pour le projet Spiral2." Paris 11, 2009. http://www.theses.fr/2009PA112304.
The SPIRAL2 project, in its construction phase at GANIL in Caen, will increase the capabilities of the current existing facility SPIRAL. This upgrade consists in the construction~of a production area of rare radioactive isotopes associated to a superconducting linac. The latter can accelerate a 5 mA deuteron beam up to 40 MeV and can handle a wide variety of ions (protons, deuterons, ions with a charge over mass ratio of 1/3) up to 14. 5 MeV/u at 1 mA. The targeted fission rate (~ 1014 fissions/secondes) and accelerating polyvalence is achieved thanks to the superconducting technology. The study, the conception and integration of the superconducting accelerating modules are in charge of the Nuclear Physics Institute of Orsay (IPNO). The PhD work presented here consisted in first testing and characterising mechanically and electromagnetically the superconducting quarter-wave resonator in a qualifying cryostat (- 269°C). Then, a fully-equipped accelerating module has been tested without beam. More specific studies have been carried out on the Q-disease, on microphonics and on the frequency tuning system with moving plunger, a novel system for superconducting cavities. The validation of the accelerating module performances during the PhD period has lead to the fabrication phase launching of the accelerating cavities and their modules
Mainaud, Hélène. "Une nouvelle approche métrologique : l'écartométrie biaxiale : application à l'alignement des accélérateurs linéaires." Université Louis Pasteur (Strasbourg) (1971-2008), 1996. http://www.theses.fr/1996STR13275.
Takorabet, Noureddine. "Optimisation de l'alimentation des convertisseurs électromécaniques linéaires à induction." Vandoeuvre-les-Nancy, INPL, 1996. http://docnum.univ-lorraine.fr/public/INPL_T_1996_TAKORABET_N.pdf.
Gerardin, Frédéric. "Etude de la compensation de charge d'espace dans les lignes basse énergie des accélérateurs d'ions légers de haute intensité." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS001/document.
The study of intense ion beam dynamics in lowenergy beam transport line (LEBT) representsone of the most important challenges inaccelerating sciences. At low energy, it isdominated by the space-charge field created bythe beam itself, which is generally non-linearand can induce halo, emittance growth and beamlosses. But, a ion beam at low energypropagating in a LEBT ionises the residual gas.The particles (ions and electrons) fromionisation are repelled or confined radially bythe space charge field according to their chargesign.Other interactions take place in the LEBT,modifying the beam dynamics and the space chargecompensation time and the space-chargecompensation yield. In order to obtain predictiveand precise results quantitatively, numericalsimulations of beam transport in space-chargecompensation regime with WARP code havebeen realized taking account the most probablephysical interactions. Then, we will discuss theresults with comparisons with experimental dataobtained on the MYRRHA and IFMIF LEBT’s
Peaucelle, Christophe. "La problématique de l'évolution des moments d'une densité de particules soumises à des forces non linéaires." Phd thesis, Grenoble INPG, 2001. http://tel.archives-ouvertes.fr/tel-00001153.
Bramoullé, Céline. "Etude par le code Monte Carlo PENELOPE des faisceaux de rayons X produits par des accélérateurs linéaires d'électrons SL-Elekta." Toulouse 3, 2000. http://www.theses.fr/2000TOU30128.
Valette, Matthieu. "Etudes de dynamique faisceau pour les accélérateurs IFMIF." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS242/document.
As part of the Broader Approach to Fusion concluded between Japan and Europe, the IFMIF (International Fusion Materials Irradiation Facility) project was launched for the study of future fusion materials resisting intense neutron fluxes. A major component of it is the couple of twin high power accelerators (2 × 5 MW) which will produce the neutron flux by bombarding a Lithium target with a deuterium beam at an energy of 40 MeV. Considering these ambitious specifications, a first phase called EVEDA (Engineering Validation and Engineering Design Activity) is ongoing to provide the design and construction of an up to scale prototype accelerator to an energy of 9 MeV in Japan. The work of this thesis belongs to the field of Accelerators Physics. It consists of beam dynamics studies for the prototype accelerator LIPAc, characterized by unprecedented current and power, thereby requiring outstanding beam quality. The characteristics of this accelerator, makes many studies and simulations for all stages of its commissioning required. Concurrently, background studies on core-halo interactions and on the effects of space charge on high current beams will also be conducted. In particular a new definition of the halo of a particle beam, adapted to the study of these accelerators will be proposed and implemented
Peaucelle, Christophe. "La problématique de l'évolution des moments d'une densité de particules soumises à des forces non linéaires." Phd thesis, Grenoble INPG, 2001. http://www.theses.fr/2001INPG0095.
High-power linear accelerators are needed as driver for several projects (spallation neutron sources, hybrid system). This interest brings us to the question of dynamics of high intensity particle beam. Inside intense beam, particles are under non linear forces mainly due to space charge effects. In order to have less heavy and more realistic tools than classical simulation methods (particle-particle interactions, particle-core model), we consider a description of the evolution of a particle density from its statistical parameters, its moments. In a first part, a detailed analysis of the moment problems is shown in a simplified but non restrictive case. To begin with, we develop an original study based on orthogonal polynomial properties which allows us to study one-dimension density moments. We can see that we obtain information about density from only few moments. Such an investigation is essential for a better understanding of moment significance. Then, we apply this description to two-dimension phase space, so that we can precisely estimate where particles are in this phase space. Finally, we enumerate difficulties met and deduce the limits of this method. The second part of this thesis, more experimental, presents beam the measurements of the beam characteristics of accelerator "GENEPI" as a part of hybrid reactor program. Moreover, we show how these specifications yields to beam calibration and validation of theoretical calculations used to design GENEPI
Книги з теми "Accélérateurs linéaires à induction":
Computational Accelerator Physics Conference (7th 2002 East Lansing, Mich.). Computational accelerator physics 2002: Proceedings of the Seventh International Conference on Computational Accelerator Physics : Michigan State University, East Lansing, Michigan, USA, 15-18 October, 2002. Bristol: Institute of Pub., 2005.
International Conference on the Application of Accelerators in Research and Industry (14th 1996 Denton, Tex.). Application of accelerators in research and industry: Proceedings of the fourteenth International Conference, Denton, Texas, November 1996. Edited by Duggan Jerome L and Morgan I. L. 1926-. Woodbury, NY: AIP Press, 1997.
Greene, David. Linear Accelerators for Radiation Therapy. Taylor & Francis Group, 2017.
Greene, David, and P. C. Williams. Linear Accelerators for Radiation Therapy. Taylor & Francis Group, 2017.
Greene, David, and P. C. Williams. Linear Accelerators for Radiation Therapy. Taylor & Francis Group, 2017.
McDermott, Patrick N. Tutorials in Radiotherapy Physics: Advanced Topics with Problems and Solutions. Taylor & Francis Group, 2016.
McDermott, Patrick N. Tutorials in Radiotherapy Physics: Advanced Topics with Problems and Solutions. Taylor & Francis Group, 2016.
McDermott, Patrick N. Tutorials in Radiotherapy Physics: Advanced Topics with Problems and Solutions. Taylor & Francis Group, 2016.