Keyword: simulation
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WECAMH05 Optimization and Simuations of Beam Dynamics in APF Accelerators linac, acceleration, rfq, ion 70
 
  • D.A. Ovsyannikov, V.V. Altsybeyev
    Saint Petersburg State University, Saint Petersburg, Russia
  
  Design problem of APF accelerator for ensurance enough high quality of output beam is considered. As we know, this problem is not easy because we have to achieve stability of longitudinal and transversal motions simultaneously. One of the first significant results in this subject were obtained by V. V. Kushin. In this work the problems of optimizations of intense ion beam are considered. The optimazation approaches for some beam characteristics improving (acceleration and transmission rates) are considered. Obtained results are confirmed by particle in cell simulations.  
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FRCAMH06 Simulation of Two-Plane Painting Multiturn Injection into BRing with Space Charge Effect injection, space-charge, septum, emittance 163
 
  • A.V. Smirnov
    JINR, Dubna, Moscow Region, Russia
  • W.P. Chai, G.F. Qu, L.P. Yao
    IMP/CAS, Lanzhou, People's Republic of China
  
  The new project HIAF is under design now in IMP (Lanzhou, China). One of the aim of the project is to accumulate about 1.4·1011 ions U34+ in the booster ring (BRing) at the injection energy 17 MeV/u. Two-plan injection procedure in horizontal and vertical spaces was proposed to fill out full acceptance of BRing. The optimization of injection parameters is presented in this report. The space charge effect was estimated with the molecular dynamics technique which was effectively used for the crystalline beam simulation.  
slides icon Slides FRCAMH06 [4.324 MB]  
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TUCASH02 Commissioning and First Tests of the New Standing Wave 10 Mev Electron Accelerator linac, coupling, electron, site 173
 
  • S.M. Polozov, D.B. Bazyl, T.V. Bondarenko, M. Gusarova, Yu.D. Kliuchevskaia, M.V. Lalayan, V.I. Rashchikov, E.A. Savin
    MEPhI, Moscow, Russia
  • M.I. Demsky, A.A. Eliseev, V.V. Krotov, D.E. Trifonov
    CORAD Ltd., St. Petersburg, Russia
  
  A new linear electron accelerator for industrial applications was developed by the joint team of CORAD and MEPhI. It is based on conventional biperiodical accelerating structure for energy range from 7.5 to 10 MeV and beam power up to 20 kW. The use of modern methods and codes for beam dynamics simulation, raised coupling coefficient and group velocity of SW biperiodic accelerating structure allowed to reach high pulse power utilization and obtain high efficiency. The first two accelerators with the new structure have been installed and tested.  
slides icon Slides TUCASH02 [4.924 MB]  
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TUPSA011 Matching the Proton Beam by Means of Independently Phased Bunchers in CYCLINAC Concept cyclotron, proton, linac, ion 234
 
  • V.S. Dyubkov, S.M. Polozov, K.E. Prianishnikov
    MEPhI, Moscow, Russia
  • S.M. Polozov
    ITEP, Moscow, Russia
  
  Nowadays a hadron therapy is one of the modern methods of a cancer treatment. For that purpose it is required that a proton beam, accelerated up to 250 MeV, penetrates on a depth about of 30 cm. It is known that linac, cyclotron and synchrotron can be used as a sources of proton/ion beams. The main linac advantages are a high beam quality and a possibility of beam energy variation but, on the other hand, initial low-energy part of a linac is markedly expensive. Production of mentioned beams is possible on the base of a concept called CYCLINAC, when a commercial cyclotron is used as an injector, in which protons are accelerated up to 20-30 MeV, for main linac. Matching the beam from a cyclotron with a linac input is the main problem of this concept. It is caused by difference of operating frequencies of cyclotron and linear accelerator as well as a high phase size of a bunch from the cyclotron. It is proposed to use the system of independently phased bunchers for beam matching. Solenoids are proposed to use for a limitation of transverse emittance growth. The BEAMDULAC-CYCLINAC program is developed for simulation of the self-consistent dynamics of proton beams in a matching channel. Results of beam dynamics simulation for CYCLINAC will be presented and discussed.  
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TUPSA016 Beam Simulation and Measurements at Beam Line to RADEX Experimental Area of INR Linac linac, quadrupole, proton, emittance 250
 
  • V.N. Aseev, S. Bragin, S.A. Gavrilov, P.I. Reinhardt-Nickoulin, O. Volodkevich
    RAS/INR, Moscow, Russia
  
  In 2015 the experimental complex beam lines of INR linac were upgraded. There is a need to study beam dynamics in these lines. The results of beam simulation at beam line to RADEX experimental area and comparison with beam measurements are presented.  
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TUPSA025 First Results of Beam Dynamics Simulation in electron injector linac for FCC-ee linac, gun, beam-loading, coupling 264
 
  • S.M. Polozov, T.V. Bondarenko
    MEPhI, Moscow, Russia
  
  New high-energy frontier project FCC is now under development at CERN. It is planed that all three modes as ee, hh and eh will be available for FCC. New injection system for FCC-ee is planned to consist of new ~ 2 GeV electron linac and electron-positron converter. Two possible layouts for further beam acceleration are discussed. The high-energy 14 GeV linac is the first layout and the booster synchrotron is the second one. Pre-injector linac design will have two regimes: ~250 pC bunches for injection and ~6 nC bunches for e−/e+ conversion. In the second case we will have extreme parameters: bunch charge up to 6 nC in 10 ps, up to 10 bunches per pulse and the pulse repetition rate up to 100 Hz. Such beam parameters lead to significant design difficulties caused by very high influence of Coulomb field in the near-cathode region and high peak beam loading. First results of beam dynamics simulation in FCC-ee injection linac and near-cathode dynamics problems are discussed in the report.  
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TUPSA026 Beam Dynamics Study for the New CW RFQ rfq, linac, proton, space-charge 267
 
  • S.M. Polozov, W.A. Barth, T. Kulevoy, Y. Lozeev, S. Yaramyshev
    MEPhI, Moscow, Russia
  • W.A. Barth, F.D. Dziuba, S. Yaramyshev
    GSI, Darmstadt, Germany
  • W.A. Barth, F.D. Dziuba
    HIM, Mainz, Germany
  • T. Kulevoy, S.M. Polozov
    ITEP, Moscow, Russia
  
  A compact "university scale" CW research proton accelerator, as well as driver linac with three branches of experimental beam lines, delivering beam energy of 3, 10 and 30 MeV for dedicated experiments, are recently under development in Russia. A proposed front-end system of both linacs comprises a 2 MeV CW RFQ, which is foreseen to bunch and accelerate up to 10 mA proton beam. The RFQ design is presented. The beam dynamics simulation results, obtained by means of different simulation code, are discussed and compared.  
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TUPSA027 The Study of the Helical RF Resonator for the 300 keV Nitrogen Ion CW Implanter ion, vacuum, impedance, rf-amplifier 270
 
  • N.V. Avreline
    TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
  • P.G. Alexey, S.M. Polozov
    MEPhI, Moscow, Russia
  
  The helical RF resonator for the single charged 300 keV nitrogen ion CW implanter was designed, simulated in CST Microwave Studio and the results were experimentally verified. The current setup of the implanter is described as well as possible modifications to accelerate ions of other types. The results of the field distribution's RF measurements and the results of the high-power test are also presented.  
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TUPSA028 QWR resonator Cavities Electrodynamics Simulations for new Nuclotron-NICA Injector cavity, linac, impedance, acceleration 273
 
  • M. Gusarova, T. Kulevoy, M.V. Lalayan, S.M. Polozov, N.P. Sobenin, D.V. Surkov, S.A. Terekhov, S.E. Toporkov, V. Zvyagintsev
    MEPhI, Moscow, Russia
  • A.V. Butenko, A.O. Sidorin, G.V. Trubnikov
    JINR, Dubna, Moscow Region, Russia
  • V. Zvyagintsev
    TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
  
  New linac-injector for Nuclotron-NICA is planned to consist of quarter-wave coaxial cavities (QWR) having velocities of ~0.07c and ~0.12c (beam energy from 5 to 17 MeV). These cavities are to be superconducting and operating at 162 MHz. Current results of the QWR cavities electrodynamics simulations and geometry optimizations are presented.  
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TUPSA031 The Cascade Interference Switch Comprising a Transmission Resonator plasma, cavity, distributed, high-voltage 282
 
  • S.A. Gorev, S.N. Artemenko, V.S. Igumnov
    TPU, Tomsk, Russia
  
  The new concept of microwave interference switches is reported. Interference switch is based on series of H-plane T-junctions (cascade switch) in the view of decreasing switched power at Off state and comprises irises in both its own input and output arms. At On state the irises act as a transmission resonator localizing the nodes of the standing wave at the junctions. Such distribution is expected to decrease the plasma losses. It was shown with a simulation that the cascade switch with additional irises increases the efficiency of the active microwave compressors. The simulation was made with CST studio and COMSOL.  
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TUPSA034 520 MeV TRIUMF Cyclotron RF System: Maintenance, Tuning and Protection operation, TRIUMF, cyclotron, vacuum 285
 
  • N.V. Avreline, T. Au, I.V. Bylinskii, B. Jakovljevic, V. Zvyagintsev
    TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
  • C.D. Bartlett
    University of Victoria, Victoria BC, Canada
  
  Funding: TRIUMF receives federal funding via a contribution agreement through the National Research Council of Canada.
1 MW CW 23 MHz RF system of the TRIUMF's 520 MeV Cyclotron has been in operation for over 40 years. Continuous development of the RF power amplifiers, the waveguide system and the measurement and protection devices provides reliable operation and improves the performance of the RF System. In this article, operation and maintenance procedures of this RF system are analysed and recent as well as future upgrades are being analysed and discussed. In particular, we discuss the improvements of the transmission line's VSWR monitor and its effect on the protection of the RF system against RF breakdowns and sparks. We discuss the new version of the input circuit that was installed, tested and is currently used in the final stage of RF power amplifier. We analyse various schematics and configurations of the Intermediate Power Amplifier (IPA) to be deployed in the future. 		 
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TUPSA035 Estimation of Multipacting in CDS Structure multipactoring, cavity, electron, coupling 288
 
  • I.V. Rybakov
    RAS/INR, Moscow, Russia
  • I.I. Isaev
    DESY Zeuthen, Zeuthen, Germany
  
  The Cut Disk Structure (CDS) is recommended for replacement of the first cavity of the main part of INR linac. For the cavity work stability there should be no multipactor at operating regime. CDS structure was first set on exploitation at DESY PITZ electron linac. For this cavity according to the analytical estimation multipaction should appear at the operating power level in coupling cells, but it was not approved by the numerical simulation with both accelerating and coupling modes excitation for RF energy transfer along the cavity. The multipactor appears only with the secondaty emission yield (SEY) growth which could happen if the inner surface of the cavity is polluted. The results of multipactor investigation in CDS PITZ were used as reference for the CDS structure for the first cavity of the main part of INR linac. The analytical estimation and numerical simulation of multipactor in CDS INR structure shows the appearance of the discharge in coupling cells with the OFC copper SEY for the operating regime of the cavity. An option for the multipactor damping with the forced excitation of oscillations in coupling cell with voltage higher than upper multipactor limit was considered.  
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TUPSA036 Manufacturing Tolerances Estimation for Proton Linac Cavities coupling, linac, proton, cavity 291
 
  • I.V. Rybakov, V.V. Paramonov, A.K. Skasyrskaya
    RAS/INR, Moscow, Russia
  
  The definition of manufacturing tolerances is one of the stages of accelerating structure construction. In case of proton linacs the value of accelerating field homogeneity is a critical parameter. It depends both on cells frequencies perturbations and the coupling coefficient perturbations. These values could be obtained using the numerical simulations of the characteristic electromagnetic oscillations in the cell. There is the method that allows the reduction of the simulations time and to avoid separate simulations for each geometrical parameter of the structure. This method was improved and extended for the pi/2-wave, pi-wave and travelling wave structures. Several examples of the method application, including the structure for the first cavity of the main part of INR linac, are presented.  
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TUPSA046 Experimental Analysis of Dipole Modes in Elliptical Cavity cavity, experiment, impedance, dipole 313
 
  • Ya.V. Shashkov, M.V. Lalayan, N.P. Sobenin
    MEPhI, Moscow, Russia
  • A. Orlov
    NRNU, Moscow, Russia
  
  The experimental measurements of transverse shunt impedance for higher order modes TM110 and TE111 for S-band elliptical cavity were carried out. The experiments using dielectric and metallic spheres as perturbing objects and with ring probe were done.  
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TUPSA061 Comparative Research of Low Energy Beam Transport Systems for H-minus Ion Beam ion, emittance, solenoid, quadrupole 333
 
  • B.A. Frolov
    IHEP, Moscow Region, Russia
  • V.S. Klenov
    RAS/INR, Moscow, Russia
  
  The source of H-minus ions for the injection in LU-30 accelerator is being constructed at IHEP. A three-dimensional (3D)simulation code IBSimu has been utilized for modeling of the transport and matching system of beam from the H-minus ion source into RFQ. A magnetic low energy beam transport (LEBT) line consisting of two solenoids and LEBT consisting of six magnetic quadrupole lenses were analyzed. The particle data from the 50 mA 100 keV ion beam extraction system simulations were taken as the starting data for the LEBT simulations. The main objective of the project was to achieve the required Twiss parameters and to minimize emittance growth at RFQ entrance. The LEBT consisting of two solenoids is more convenient in adjustment and as simulation results have shown this system offers more acceptable beam characteristics at the match point in comparison with LEBT composed of quadrupole lenses.  
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TUPSA062 Modeling of Triode Source of Intense Radial Converging Electron Beam electron, cathode, target, plasma 336
 
  • V.V. Altsybeyev, V.I. Engelko, A.D. Ovsyannikov, D.A. Ovsyannikov, V.A. Ponomarev
    Saint Petersburg State University, Saint Petersburg, Russia
  • R. Fetzer, G. Müller
    KIT, Karlsruhe, Germany
  
  The considered source of triode type produces intense radial converging electron beam for irradiation of cylindrical targets. As an electron emitter an explosive plasma cathode is used. The role of initial transverse velocities of electrons, defocusing effect of the controlling grid, the beam self-magnetic field, electron and ion emission from the controlling grid, backscattering of electrons and ion flow from the target is analyzed. Conditions for achieving required electron beam parameters (the electron kinetic energy - 120 keV, the beam energy density on the target 40 J/cm2 on a maximum possible length of the target surface) were determined.  
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TUPSA069 Optimization of an RF Probe Vicinity for RF Gun Cavities cavity, gun, HOM, quadrupole 348
 
  • V.V. Paramonov
    RAS/INR, Moscow, Russia
  
  To provide electron bunches with exceptionally high brightness, RF gun cavity should operate with the extreme electric and magnetic fields. The RF probe is required for the mostly reliable and precise measurements of the RF field phase and amplitude directly from the cavity. The implementation of an RF probe in the cavity design generates a set of coupled problems, which is analyzed and compared for different operating frequencies and different RF pulse length. Both general dependencies and particularities are considered. Some recommendations for practical choice of the RF probe are presented.  
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WEPSB003 Design Relativistic Charged Particle Beam Transportation Channels interface, software, database, target 354
 
  • G.P. Averyanov, V.A. Budkin, I.O. Osadchuk
    MEPhI, Moscow, Russia
  
  This paper contains results of development new version (2016) of program for channels design high-energy beams of charged particles. The program includes application package modeling the dynamics of charged particles in the channel, operational tools to change the channel parameters, channel optimization tools and processing output beam parameters with graphic and digital presentation of its key features. The MATLAB (Scilab) was used as programming tools, allows to make the source code modular, compact and scalable. New object-oriented graphical user interface provides an interactive assembly of new or modernization of previously developed channel - selection and arrangement of its elements, as well as the installation and the variation of their parameters. The relational database, which is part of the new version of program, providing additional functionality to the designer. It is intended for storage of the current development, and to preserve the previously completed projects, as well as other useful designer related information. A multi-output of all the main parameters of the beam at the output, as well as anywhere in the channel. In this case, the developer has the ability to interactively search and setting the optimum mode of operation channel.  
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WEPSB006 On Modeling and Optimization of Intense Quasiperiodic Beam Dynamics controls, klystron, electron, bunching 363
 
  • I.D. Rubtsova
    St. Petersburg State University, St. Petersburg, Russia
  
  The paper is devoted to quasiperiodic beam dynamics investigation. Particle density is modeled by trigonometric polynomial. Space charge field is represented in the similar form. This approach is applied to beam dynamics investigation in klystron-type buncher. Numerical algorithm of polynomial coefficients calculation from the positions and impulses of model particles is formalized. As a result Coulomb field intensity is expressed in the form of integral over the set of particle phase states. Integro-differential beam evolution model is presented. Analytical expression of the variation of beam dynamics quality criterion is obtained. It makes possible directed methods using for beam dynamics optimization.  
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WEPSB007 On Application of Monte Carlo Method for Poisson Problem Solving electron, controls, lattice, plasma 367
 
  • L.V. Vladimirova, I.D. Rubtsova
    St. Petersburg State University, St. Petersburg, Russia
  
  The paper presents the application of random grid walk for Dirichlet problem solving for Poisson equation. Boundary value problem is discretized and reduced to the system of linear algebraic equations. The matrix of this system is used for stochastic matrix constructing. Thus, there is a possibility of Markov chains obtaining. The special random value is defined on Markov chain trajectories; this value is used for approximation of the desired solution. The advantages of this method are discussed in the paper. The algorithm is applied for electric potential calculation in the cell of support lattice of exit window in large-aperture electron accelerator.  
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WEPSB012 On The Beam Dynamics Simulation In The Injection System injection, software, controls, rfq 382
 
  • A.D. Ovsyannikov, S.A. Kozynchenko, V.A. Kozynchenko
    Saint Petersburg State University, Saint Petersburg, Russia
  
  When developing a particle accelerator for generating the high-precision beams, the injection system design is of importance, because it largely determines the output characteristics of the beam. At the present paper we consider the injection systems consisting of electrodes with given potentials. The design of such systems requires carrying out simulation of beam dynamics in the electrostatic fields. For external field simulation we use the new approach, proposed by A.D. Ovsyannikov, which is based on analytical approximations, or finite difference method, taking into account the real geometry of the injection system. The software designed for solving the problems of beam dynamics simulation and optimization in the injection system for non-relativistic beams has been developed. Both beam dynamics and electric field simulations in the injection system, that use analytical approach and finite difference method have been made and the results presented in this paper.  
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WEPSB013 On Approach for Resonant Frequency Tuning in Drift Tube Structures on the Designing Stage cavity, controls, target, electron 386
 
  • I. Skudnova, V.V. Altsybeyev
    Saint Petersburg State University, Saint Petersburg, Russia
  
  Current research considers the interdigital H-mode linear resonant accelerator with drift tubes mounted inside the cavity. The focus of the study has been on the dependence of resonant frequency on the parameters of the geometry. Since Alternating-Phase-Focusing (APF) type of accelerator is investigated, the efficiency of the operation depends on the synchronization of the charged particle velocity and accelerating field oscillations. Researchers can control it by the variation of longitudinal size of the cells of the structure (periods). On the other hand, the effective performance of the resonant system requires the equality of resonant frequencies of its cells, because it affects the uniformity of accelerating field distribution along the axis. The diversity of cells longitudinal sizes causes the deviation from the particular value of the resonant frequency. This aberration can be eliminated by the adjustment of other geometry parameters: period's length, gap ratio and drift tube diameter. We have conducted the study to analyze the relation between resonant frequency and these values. Using the this dependency we can tune the geometry parameters of each period in the structure. We first create the computer-aided design (CAD) geometry model of the accelerator cavity. Then, using Comsol Multiphysics, the platform for physics-based modeling and simulation, we conduct the calculation of resonant frequencies.  
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WEPSB015 On the Integro-Differential Equations for Dynamics of Interacting Charged Particles Modeling electromagnetic-fields, plasma, controls, focusing 392
 
  • D.A. Ovsyannikov
    St. Petersburg State University, St. Petersburg, Russia
  • N.S. Edamenko
    Saint Petersburg State University, Saint Petersburg, Russia
  
  In this paper we investigate the integro-differential model for the dynamics of charged particles with smooth interaction for the analysis and optimization of intense charged particle beams motion in accelerating and focusing structures. Introduced mathematical models allows us to calculate the first variation of the different functionals characterizing the desired parameters of accelerators in analytical form. Thus mathematical model can be effectively used in the analysis and optimization of charged particles dynamics in accelerators.  
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WEPSB030 Parallelization of Envelope Dynamics of High Intensive Beams space-charge, software, GPU, controls 425
 
  • N.V. Kulabukhova
    St. Petersburg State University, St. Petersburg, Russia
  
  In this work the survey of methods for high intensive beam dynamics is given. As an alternative to them the approach based on envelope dynamics was used. This method is focusing on the use of the matrix form for Lie algebraic methods for calculating the beam dynamics in the presence of self-field of the beam. In particular, the corresponding calculations are based on the predictor-corrector method. Pros and cons of using described approach on hybrid systems are discussed.  
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WEPSB032 Numerical Analysis of Cavity Mode Operation and Electron Beam Dynamics in Lebedev Institute Microtron microtron, electron, cavity, operation 428
 
  • V.S. Dyubkov, Y.A. Bashmakov, Y. Lozeev
    MEPhI, Moscow, Russia
  • Y.A. Bashmakov
    LPI, Moscow, Russia
  
  Dynamics of electrons in classic microtron is studied. 3D cavity model is developed and electromagnetic field distribution is simulated. Dependence of output beam parameters on microtron operation mode is investigated and discussed.  
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WEPSB034 The Electromagnetic Field Structure in the Circular Waveguide with Transverse Boundary vacuum, electromagnetic-fields, acceleration, radiation 434
 
  • A.A. Grigoreva
    Saint-Petersburg State University, Saint-Petersburg, Russia
  • S.N. Galyamin, A.V. Tyukhtin, V.V. Vorobev
    Saint Petersburg State University, Saint Petersburg, Russia
  
  Funding: This work was supported by Russian Foundation for Basic Research under Grant 15-02-03913.
The study of the electromagnetic field in a circular waveguide having a partial dielectric filling is of interest for a series of applications including new methods of particle acceleration. We consider the structure of the electromagnetic field in the circular waveguide which consists of two semi-infinite parts. One of them is empty and the other one has a cylindrical dielectric layer and a coaxial vacuum channel. Incident electromagnetic field is a symmetrical TM mode launching either from the vacuum part or from the partially dielectric part. Such mode can be excited by a particle bunch moving along the waveguide axis. The analytical investigation of reflected and transmitted fields is performed. On the basis of this study, we develop an algorithm for numerical calculation and demonstrate properties of waveguide modes excited because of presence of transversal boundary. Moreover we perform direct numerical simulation using Comsol Multiphysics. The comparison of results of our algorithm with simulations is given, and the good agreement between both methods is demonstrated. 		 
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WEPSB048 Beam Shaping Assembly Optimization for Boron Neutron Capture Therapy neutron, proton, photon, target 471
 
  • T. Sycheva, S.Yu. Taskaev
    BINP SB RAS, Novosibirsk, Russia
  • S.A. Frolov, S.I. Lezhnin
    NSI RAS, Moscow, Russia
  
  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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WEPSB049 Temperature Control System for Thermoradiotherapy Facilities dipole, controls, experiment, focusing 474
 
  • S.M. Polozov, A.M. Fadeev, S.M. Ivanov
    MEPhI, Moscow, Russia
  • E.A. Perelstein
    JINR, Dubna, Moscow Region, Russia
  
  It is known, hyperthermia is widely used to improve the efficiency of cancer treatment. Local hyperthermia is a method where only tumor is heated, on the other hand healthy tissues are protected from overheating. It was proposed to use an array of eight independently phased dipoles operating on 100-150 MHz to focus the RF energy in deep-situated volume of 30-50 mm size. But the problem of non-invasive temperature measurement should to be solved for correct operation of the local thermoradiotherapy systems. Conventional invasive thermometry devices as thermocouples, thermistors or Bragg optical sensors can not be widely used because of serious risk of the cancer cells transport to healthy tissues. Radiothermometry or acoustic thermometry can not be used for tissues located deeper than 5-7 cm. As known electrodynamics characteristics of tissues depend on temperature. It was proposed to use this effect for active radiothermometry in local hyperthermia. Two opposite RF dipoles can be used as generator and receiver of pick-up signal. It was shown by simulations that such method can be used for thermometry of deep-situated tissues and have high resolution. Results of simulation will present in report.  
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WEPSB050 Laboratory Model of Thermoradiotherapy Facility: Experimental Results dipole, experiment, controls, radiation 477
 
  • S.M. Polozov, A.M. Fadeev, S.M. Ivanov
    MEPhI, Moscow, Russia
  • E.A. Perelstein
    JINR, Dubna, Moscow Region, Russia
  
  Hyperthermia combined with radiotherapy (thermoradiotherapy) or with chemotherapy is one of promising approach to improve the cancer treatment efficiency. The treatment of deep-situated tumors is a problem which can not be solved by means of traditional facilities developed for whole-body or regional hyperthermia because of overheating of healthy tissues and blood. A cylindrical array of independently phased dipoles was proposed to focus electromagnetic energy in deep-situated tumors. It was early shown by simulations that array of eight independently phased dipoles operating on 100-150 MHz can be used to focus energy in an ellipsoid of 30-50 mm in size. Later the laboratory model of thermoradiotherapy facility was developed and constructed and series of experiments were carried out. Results of experiments and its comparison with simulations will discuss in report.  
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WEPSB057 Beam Dynamics in New 10 Mev High-Power Electron Linac for Industrial Application electron, gun, linac, bunching 493
 
  • S.M. Polozov, V.I. Rashchikov
    MEPhI, Moscow, Russia
  • M.I. Demsky
    CORAD Ltd., St. Petersburg, Russia
  
  Beam dynamics simulation in electron gun, bunching and accelerating cells of new 10 Mev high-power electron linac was fulfieled with the help of developed at MEPhI SUMA * and BEAMDULAC-BL ** codes. Three-electrode electron gun was used to obtain up to 400-450 mA of pulse beam current which is necessary to produce 300 mA of the accelerated beam. Precise gun simulation was conducted to satisfy all necessary output beams characteristics, such as profile, energy spectrum, phase space size etc. Some additional calculation was conducted to provide wide range of gun output beam parameters which will be used for subsequent accelerator modification. The conventional biperiodical accelerating structure based on disk loaded waveguide was used in linac. Beam dynamics optimization was pointed to obtain effective beam bunching for all energy range and to achieve narrow energy spectrum. Simulation results shows that linac provides effective beam bunching and acceleration for wide bands of beam currents and energies.
* V.I. Rashchikov, PAST, Series: Nuclear Physics Investigations, 10 (18), p.50, 1990
** T.V. Bondarenko et al. PAST, Series: Nuclear Physics Investigations, 6 (88), p. 114, 2013 		 
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WEPSB068 Radiation From Open-Ended Flanged Waveguide With Dielectric Loading vacuum, radiation, electron, extraction 515
 
  • V.V. Vorobev, S.N. Galyamin, A.A. Grigoreva, A.V. Tyukhtin
    Saint Petersburg State University, Saint Petersburg, Russia
  
  Funding: The work is supported by the Grant of the President of Russian Federation (No. 6765.2015.2) and the Grants from Russian Foundation for Basic Research (No. 15-32-20985, 15-02-03913).
Terahertz radiation is considered as a promising tool for a number of applications. One possible way to emit THz waves is to pass short electron bunch through a waveguide structure loaded with dielectric. Previously we considered the extraction of radiation from the open end of the waveguide with dielectric loading in both approximate and rigorous formulation. We also developed a rigorous approach based on mode-matching technique and modified residue-calculus technique for the case when the waveguide with dielectric is co-axial with infinite waveguide with greater radius. The study presented is devoted to the case when the dielectric loaded waveguide has a flange and enclosed into another waveguide with a greater radius. The case of the flanged waveguide in the unbounded vacuum space can be described as the limiting case of the problem under consideration. We perform analytical calculation (based on mode-matching technique and modified residue-calculus technique) and direct numerical simulation. 		 
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WEPSB069 Radiation of a Bunch Flying from the Open End of a Waveguide with a Dielectric Loading radiation, vacuum, electron, electromagnetic-fields 518
 
  • S.N. Galyamin, A.V. Tyukhtin, V.V. Vorobev
    Saint Petersburg State University, Saint Petersburg, Russia
  • A. Altmark, S. Baturin
    LETI, Saint-Petersburg, Russia
  
  Funding: Work is supported by the Grant of the President of Russian Federation (No. 6765.2015.2) and the Grant from Russian Foundation for Basic Research (No. 15-32-20985).
In this paper we proceed with our investigation of Terahertz emission from beam moving in waveguide structures with dielectric layer*. Recently we have considered an open-ended waveguide (with uniform dielectric filling) placed inside regular vacuum waveguide of a larger radius and excited by a single incident waveguide mode**. Here we present analytical results for the case where the structure is excited by a moving charge. We also perform simulations using CST® PS code and compare results.
* S.N. Galyamin, A.V. Tyukhtin, S.S. Baturin, S. Antipov, Opt. Express 22(8) 8902 (2014).
** S.N. Galyamin, A.V. Tyukhtin, S.S. Baturin, V.V. Vorobev, A.A. Grigoreva, in Proc. IPAC'16, pp. 1617-1619. 		 
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THPSC006 Simulation of Precision Magnetic Shielding System for Beam Injectors in Tokamaks plasma, operation, shielding, ion 550
 
  • A.M. Bazarov, V.M. Amoskov, V.A. Belyakov, E.I. Gapionok, V.P. Kukhtin, E.A. Lamzin, S.E. Sytchevsky
    NIIEFA, St. Petersburg, Russia
  • V.A. Belyakov, S.E. Sytchevsky
    Saint Petersburg State University, Saint Petersburg, Russia
  • Y. Gribov
    ITER Organization, St. Paul lez Durance, France
  
  Beam injectors in tokamaks are utilized for plasma heating and diagnostics. Due to the relatively large distance between the injectors and plasma, the tokamak stray magnetic field inside injectors during the operation should be very low (down to the tenths of Gauss) to avoid the deflection of the ion beams. The Magnetic Field Reduction System (MFRS) should be used to reduce the stray magnetic field produced by the tokamak EM systems and plasma to an acceptable level inside the injectors. In total, the complex MFRS can consist of a passive magnetic shield and active coils to provide the strict design criteria during a plasma scenario. To provide precise computations, detailed numerical models of MFRS should have the dimensions up to several tens of millions of degrees of freedom. Such problem could be solved only with the use of high-efficiency vector algorithms and parallel computations. The paper is dedicated to simulation of MFRS for beam injectors in tokamaks.  
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THPSC007 Modeling Magnetic Effects of Steel Rebar of Concrete Surroundings for Electrophysical Apparatus plasma, shielding, experiment, operation 553
 
  • V.M. Amoskov, A.M. Bazarov, V.A. Belyakov, M. Kaparkova, V.P. Kukhtin, E.A. Lamzin, B.V. Lyublin, S.E. Sytchevsky
    NIIEFA, St. Petersburg, Russia
  • V.A. Belyakov, S.E. Sytchevsky
    Saint Petersburg State University, Saint Petersburg, Russia
  • Y. Gribov
    ITER Organization, St. Paul lez Durance, France
  
  Large electrophysical apparatus (accelerators, detectors, tokamaks, stellarators) usually produce strong magnetic fields, which magnetizing surrounding ferromagnetics (steel masses). For example, concrete structures of buildings are reinforced with steel rebar that can produce a local substantial contribution into the magnetic field in the area where the service staff and magnetically sensitive equipment is located. The article describes an advanced approach to modelling magnetic properties of reinforced concrete structures taking into account the anisotropic effect due to rod layers orientations. The equivalent model has been validated in the computation of a test problem. For comparison, simulations have been carried out with a detailed 3D FE model that describes each of the steel rods. The equivalent model has required a few times less finite elements than the detailed model. A comparison of the fields obtained has demonstrated a very good match, even for the distances comparable with the rebar rod gaps.  
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THPSC014 Fast Kicker for High Current Electron Beam Manipulation in Large Aperture kicker, controls, induction, software 569
 
  • V.V. Gambaryan, A.A. Starostenko
    BINP SB RAS, Novosibirsk, Russia
  • A.A. Starostenko
    NSU, Novosibirsk, Russia
  
  Pulsed deflecting magnet (kicker) project was worked out in BINP (Budker Institute of Nuclear Physics). The kicker design task is: impulsive force value is 1 mT*m, pulse edge is 5 ns, and impulse duration is about 200 ns. The unconventional approach is for plates to be substituted by a set of cylinders. Obtained magnet construction allows controlling field homogeneity by changing currents magnitudes in cylinders. Furthermore we demonstrated the method of field optimization. In addition the harmonic components measurement technique was considered and the possibility to control harmonic components value was shown.  
poster icon Poster THPSC014 [2.155 MB]  
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THPSC041 New Superconducting Linac Injector Project for Nuclotron-Nica: Current Results linac, proton, acceleration, focusing 626
 
  • S.M. Polozov, M. Gusarova, T. Kulevoy, M.V. Lalayan, A.V. Samoshin, S.E. Toporkov, V. Zvyagintsev
    MEPhI, Moscow, Russia
  • M.A. Baturitski, S.A. Maksimenko
    INP BSU, Minsk, Belarus
  • A.V. Butenko, A.O. Sidorin, G.V. Trubnikov
    JINR, Dubna, Moscow Region, Russia
  • A.A. Marysheva, V.S. Petrakovsky, I.L. Pobol, A.I. Pokrovsky, D.A. Shparla, S.V. Yurevich
    Physical-Technical Institute of the National Academy of Sciences of Belarus, Minsk, Belarus
  • V. Zvyagintsev
    TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
  
  The joint collaboration of JINR, NRNU MEPhI, INP BSU, PTI NASB, BSUIR and SPMRC NASB started in 2015 a new project on the development of superconducting cavities production and test technologies and new linac-injector design. This linac intend for the protons acceleration up to25 MeV (up to 50 MeV after upgrade) and light ions acceleration up to ~7.5 MeV/u for Nuclotron-NICA injection. Current status of linac general design and results of the beam dynamics simulation and SRF technology development are presented in this report.  
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THPSC046 High-Power High-Temperature Graphite Beam Dump for E-Beam Irradiation Test of Prototype IF Target in RISP target, electron, scattering, experiment 632
 
  • V. Gubin
    Institute of Laser Physics, SB RAS, Novosibirsk, Russia
  • J.Y. Kim, J.-W. Kim, Y.H. Park
    IBS, Daejeon, Republic of Korea
  • Yu. Maltseva, P.V. Martyshkin
    BINP SB RAS, Novosibirsk, Russia
  
  Nowadays project RISP is developed in IBS, Daejeon. One of the main project device is graphite target system meant for production of rare isotopes by means of the in-flight fragmentation (IF) technique. The power inside the target system deposited by the primary beam with energy of 200 MeV/u is estimated to be around 100 kW. The target represents rotating multi-slice graphite disc cooled by thermal radiation. Necessary step of target development is integrated test of target prototype under high power electron beam modelling real energy deposit into target. This test is planned to be held in BINP, Novosibirsk, with the use of ELV-6 accelerator. Heavy-ion beam will be modelled by the e- beam of ELV-6 accelerator with diameter down to ~1 mm and energy 800 keV (minimum possible). IF target is not full stopping target for an electron beam with energy 800 keV. Considerable part of beam energy will be not absorbed by a target material and must be deposited into special beam dump. In this paper the design of beam dump of the graphite cone geometry cooled by thermal irradiation is described.  
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THPSC047 A Faraday Cup for a Low Charge LWFA Electron Beam Measurement electron, laser, acceleration, plasma 635
 
  • V. Gubin, V.I. Trunov
    Institute of Laser Physics, SB RAS, Novosibirsk, Russia
  • V.V. Gambaryan, A.E. Levichev, Yu. Maltseva, P.V. Martyshkin, A.A. Pachkov, S.N. Peshekhonov
    BINP SB RAS, Novosibirsk, Russia
  
  Nowadays laser wakefield acceleration (LWFA) is considered as one a perspective method for GeV electron beam production. Combination of laser accelerated electrons and Compton backscattering of probe light beam opens possibility to create the table top source of femtosecond light beam in x-ray and gamma range. Project of laser-driven Compton light source started in ILP SB RAS in collaboration with BINP SB RAS. Production of 1-10 pC electron beams sub-ps time range duration with energies up to 100 MeV is expected as a result of the first stage of the project. Since energy of electrons does not exceed of 100 MeV, it allows using Faraday cup (FC) with reasonable dimensions, instead of commonly used integrating current transformer (ICT). Geometry of FC was optimized taking into account of beam stopping simulation as well as low capacity requirement. RF properties, simulation of the system operation were carried out. System has been tested at the VEPP-5 electron linac. Results of development and testing of this FC are presented.  
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THPSC050 Possibilities of Diffraction Radiation Non-Destructive Diagnostics for Non- and Moderately Relativistic Beams radiation, proton, target, diagnostics 644
 
  • D.A. Shkitov, A. Potylitsyn
    TPU, Tomsk, Russia
  
  Funding: The work was partially supported by the RFBR grant No 15-52-50028.
In order to design and construct new modern accelerators with high brightness beams, the development new non-destructive diagnostic tools for accelerated beams is required. Diffraction radiation (DR) is generated by charged particles moving in the vicinity of the conductive target. The DR technique is used successfully for non-destructive diagnostics for ultrarelativistic beams*,**. For non-relativistic and moderately relativistic charged particles beams (g ~ a few tens or less, g is the Lorentz factor) non-destructive DR diagnostics can be applied also if a beam intensity is high enough due to coherent effect. Intensity of coherent radiation is proportional to the squared bunch population. In this report estimations of non-destructive bunch diagnostics possibility based on DR for the beam parameters of a few machines are presented. Those estimations were performed for electron machine: PITZ project*** and laser wakefield accelerator****, and moreover for ESS proton linear accelerator*****. First evaluation of whole wavelength range DR from 4-mm-slit target gave about 56 mJ from one macro-pulse of ESS accelerator. Amplification of DR spectral-angular intensity due to coherent effect will be in N = 108 times than incoherent radiation from the same beam, where N is the bunch population.
* P. Karataev et al., PRL 93 (2004) 244802
** A. Cianchi et al., PRST-AB 14 (2011) 102803
*** http://pitz.desy.de
**** B.S. Rao et al., PRST-AB 17 (2014) 011301
***** https://europeanspallationsource.se 		 
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THPSC055 Electrodynamic Characteristics of RF-Deflector for Bunch Shape Monitor electron, cavity, impedance, insertion 659
 
  • D.A. Chermoshentsev, A. Feschenko, S.A. Gavrilov
    RAS/INR, Moscow, Russia
  • D.A. Chermoshentsev
    MIPT, Dolgoprudniy, Moscow Region, Russia
  • D.A. Chermoshentsev
    Skoltech, Moscow, Russia
  
  Bunch shape monitors, based on a transverse RF-scanning of secondary electrons, are used for measurements of particles longitudinal distribution in bunches at different linear ion accelerators. The phase resolution of such monitors depends crucially on accuracy of fabrication and tuning of RF-deflector, thus preliminary simulations of its electrodynamic characteristics are of importance for subsequent commissioning of the monitor. Simulations of some basic operational electrodynamic parameters and results of experimental measurements are presented.  
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THPSC087 Stabilization of the Equilibrium Position of a Magnetic Control System with Delay controls, feedback, electron, permanent-magnet 736
 
  • A.Yu. Aleksandrov, A.P. Zhabko, I.A. Zhabko
    Saint Petersburg State University, Saint Petersburg, Russia
  • A.A. Kosov
    ISDCT SB RAS, Irkutsk, Russia
  
  Funding: The research was partially supported by the Saint Petersburg State University (project No. 9.37.157.2014), and by the Russian Foundation for Basic Research (grant Nos. 15-08-06680 and 16-01-00587-a).
Nonlinear oscillatory systems are widely applied for the modeling of charge particles motions in cyclotrons in neighborhoods of equilibrium orbits. They are also used for the analysis and synthesis of magnetic control devices. An actual problem for such systems is stabilization of their operating modes. In this report, analytical and numerical investigations of stability of the equilibrium position for a nonlinear oscillatory system are presented. The system can be treated as a mathematical model of magnetic suspension control system of a gyro rotor. A delay in the feedback control scheme and dissipative forces occurring due to energy losses at the interaction of the magnetic field with currents in the control loops are taken into account. Two approaches to the synthesis of stabilizing controls are proposed. The first one is based on the using of gyroscopic control forces. It is applicable in the case of essentially nonlinear homogeneous dissipative forces. The second approach is efficient for systems with linear dissipative forces. For this case, potential control forces are constructed. With the aid of a computer simulation of dynamics of closed-loop systems, a comparison of these approaches is fulfilled, and their features and conditions of applicability are determined. 		 
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