Keyword: simulation
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TUACH02 Long Term Beam Dynamics Simulation with the BETACOOL Code electron, ion, injection, collider 60
 
  • A.V. Smirnov, A.O. Sidorin
    JINR, Dubna, Moscow Region, Russia
  
  General goal of the BETACOOL program is to simulate long term processes (in comparison with the ion revolution period) in the ion storage ring leading to variation of the ion distribution function in 6 dimensional phase space. The ion beam motion inside a storage ring is supposed to be stable and it is treated in linear approximation. Results of the numerical simulation of the beam dynamics for new projects FAIR (GSI, Germany) and NICA (JINR, Russia) are presented.  
slides icon Slides TUACH02 [1.004 MB]  
 
TUBCH02 Simulation of Beam Dynamics in the Extraction System of the JINR Phasotron extraction, proton, vacuum, acceleration 76
 
  • S.A. Kostromin, A. Chesnov, S.G. Shirkov
    JINR, Dubna, Moscow Region, Russia
  • L.M. Onischenko
    JINR/DLNP, Dubna, Moscow region, Russia
  
  Beam dynamics is studied in the extraction by the regenerative method from the JINR Phasotron (657 MeV, 3 mkA protons) using special complex of computer programs. Parameters of the beam at the deflector entrance are calculated. The beam extraction efficiency is found to be ~40%. The mean movement in the extraction channel is investigated. Calculated beam transverse parameters agree with the experimental ones to accuracy of~20%.  
slides icon Slides TUBCH02 [2.223 MB]  
 
TUCCH01 New Ideas for Crystal Collimation scattering, collimation, extraction, proton 79
 
  • V.V. Tikhomirov, A.I. Sytov
    Belarussian State University, Scientific Research Institute of Nuclear Problems, Minsk, Belarus
  
  Beam halo represents considerable threat for superconducting magnets. Crystals can increase the efficiency of collimation system being used both in channeling and volume reflection modes. We suggest to facilitate both these approaches using, respectively, the crystal cut method* to increase channeling capture efficiency and multiple volume reflection from different planes of one bent crystal(**,***) to increase the volume reflection angle. Efficiency of these methods drastically depends on the halo particle transverse distribution. The first approach is most efficient at smallest transverse diffusion rate while the second one in the opposite case. We also demonstrate that the miscut, i.e. the nonparallelity of lateral crystal surface and atomic planes, can considerably affect the collimation efficiency at present crystal collimation SPS experiments while will not be so important in the real LHC environment.
* V.V. Tikhomirov, JINST 2(2007) P08006.
** V.V. Tikhomirov, Phys. Lett. B. 655(2007)217.
*** W. Scandale, et al, Phys. Lett. B. 682(2009)274; EPL. 93(2011)56002. 		 
slides icon Slides TUCCH01 [2.222 MB]  
 
THBOR03 A Possibility of High-Energy Bremsstrahlung Dosimetry by Indium Activation target, electron, radiation, photon 155
 
  • V.L. Uvarov, A.N. Dovbnya, V.V. Mytrochenko, V.I. Nikiforov, S.A. Perezhogin, Yu.V. Rogov, V.A. Shevchenko, I.N. Shlyakhov, B.I. Shramenko, A.Eh. Tenishev, A.V. Torgovkin
    NSC/KIPT, Kharkov, Ukraine
  
  Development of a number of promising photonuclear technologies is connected with the use of bremsstrahlung sources having end-point energy up to 100 MeV and average radiation power of tens kW. Commonly, such sources are created on the basis of high-current electron linacs. A possibility of bremsstrahlung dosimetry by means of activation of a target from indium of natural composition and absorbed dose determination through the specific activity of the 115mIn isomer is reported. Preliminary study of isomer photoactivation as well as the yield of reference reactions from simultaneously irradiated natural molybdenum was conducted by simulation technique. Joint measurement of the 115mIn, 90Mo, 99Mo activity and absorbed dose in the PMMA standard dosimeters were carried out at LU-10 and LU-40 linacs of NSC KIPT in the electron energy range 8…70 MeV. It was found that, within the range of study, the ratio of the 115mIn specific activity to absorbed dose in the PMMA slightly depends on the bremsstrahlung end-point energy.  
slides icon Slides THBOR03 [0.553 MB]  
 
FRAOR02 Method of State and Alignment Monitoring for Crystal Deflectors of Relativistic Ions proton, radiation, photon, controls 200
 
  • A.S. Gogolev, S.R. Uglov
    TPU, Tomsk, Russia
  • A.M. Taratin
    JINR, Dubna, Moscow Region, Russia
  
  Funding: We acknowledge the partial support through the project GK No. 11.519.11.2030
Systems of relativistic particle beam steering based on the use of channeling effect are widely applied in leading research centers of Russia and foreign countries. An operative control is required in the case of using crystal deflectors for the accelerator beam collimation. The control should allow concluding about the state and alignment of the crystal collimator relative to the beam halo. The method of state and alignment monitoring for the crystal deflectors of relativistic ions using coherent X-rays generated by particles in crystals is suggested in this report. 		 
 
FRBOR03 Non-gated Field Emission Array as Low-Energy Electron Source: Experiment and Simulation cathode, vacuum, high-voltage, electron 218
 
  • K.A. Nikiforov, L.I. Antonova, N.V. Egorov, V.V. Trofimov
    St. Petersburg State University, St. Petersburg, Russia
  
  A non-gated NbN on Si wafer field emission arrays are studied. The I-V measurements and emission characteristics of edge-shaped cathodes in atmosphere low-voltage regime are considered. Mathematical and computer models are presented. The current density obtained from experiment was up to 384 Ampere per square centimeter in emission area 9 sq.mm. Low-voltage regime (20 V) for near (~ 1mkm) interelectrode distance in diode configuration is discussed.  
 
FRBCH07 Transformation of Beams in the Plasma Lens and Investigation of Z-Pinch Dynamics plasma, ion, focusing, laser 239
 
  • A.A. Drozdovsky, N.N. Alexeev, S.A. Drozdovsky, A. Golubev, Yu.B. Novozhilov, P.V. Sasorov, S.M. Savin, V.V. Yanenko
    ITEP, Moscow, Russia
  
  Funding: Work supported by the Russian Foundation for Basic Research
The plasma lens can carry out sharp focusing of ion beam with considerable reduction sizes of focal spot. At those stages of the plasma discharge at which the magnetic field is nonlinear, formation of other interesting configurations of beams is possible. The report presents the results of studies transformation the Gaussian beam into hollow one and into beam with homogeneous spatial distribution. The discharge current distributions obtained by numerical calculation ensure the experimental beam transformations. Thus possibility of the research of the plasma discharge dynamics by means of relativistic ions beams is shown. The plasma lens represents the universal device for scientific and technical applications in particular for irradiation of medical objects. 		 
slides icon Slides FRBCH07 [1.390 MB]  
 
MOPPA003 A Coaxial Two-Channel Dielectric Wakefield Structure for Two-Beam Acceleration Experiments at SLAC wakefield, radiation, vacuum, collider 248
 
  • G.V. Sotnikov
    NSC/KIPT, Kharkov, Ukraine
  • J.L. Hirshfield
    Yale University, Physics Department, New Haven, CT, USA
  • T.C. Marshall, G.V. Sotnikov
    Omega-P, Inc., New Haven, USA
  • S.V. Shchelkunov
    Yale University, Beam Physics Laboratory, New Haven, Connecticut, USA
  
  Funding: Research is supported by U.S. Department of Energy, Office of High Energy Physics
Results of analytical and numerical investigations of a coaxial dielectric wakefield accelerator structure (CDWA) for experiments at FACET (SLAC) on two-beam acceleration are presented. For these experiments it is proposed to use ~1 THz structure with two nested silica cylindrical shells having these diameters: outer shell, OD = 2 mm, ID = 1 mm; inner shell OD = 360 mkm, ID = 100 mkm. A conventional CDWA structure is energized by an annular drive bunch travelling in the annular vacuum channel. At present, FACET has no drive bunch of annular shape which is required for a CDWA. However, our analytical studies and numerical simulations prove clearly that an annular drive bunch can be substituted by a solid bunch having the same charge*. For the simulation we used the SLAC drive bunch parameters: energy is 23 GeV, charge is 3 nC, axial RMS size is 25 mkm, transverse RMS size is 10 mkm. This bunch sets up at the central channel axis an accelerating gradient of ~1 GeV/m. Questions of transverse stability of the solid drive and accelerated bunches in this dielectric accelerator structure are also discussed.
*G.V.Sotnikov, J.L. Hirshfield, T.C. Marshall, S.V. Shchelkunov, "A reciprocity principle for wakefields in a two-channel coaxial dielectric structure" IPAC’12, New Orleans, May 2012, WEPPP004. 		 
 
MOPPA019 RF Antenna Lead high-voltage, radiation, electron, cavity 284
 
  • A.M. Barnyakov, A.E. Levichev
    BINP SB RAS, Novosibirsk, Russia
  • Y.D. Chernousov
    ICKC, Novosibirsk, Russia
  • V. Ivannikov, I.V. Shebolaev
    ICKC SB RAS, Novosibirsk, Russia
  
  RF antenna lead is described. This lead is used for RF power input to high voltage electrodes. The device consists of receiving and transmitting antennas realized as symmetrical parts of coaxial cavity with dielectric disk between the parts. Main operating characteristics are the following: high voltage is over 60 kV, coefficient of transmission at the operating frequency is over 0.97, bandpass is over 70% (at the level of -3dB). The scheme of the device, principle of work and measured results are presented.  
 
MOPPA020 Multipactor Discharge in eLINAC Accelerator cavity, accelerating-gradient, TRIUMF, multipactoring 287
 
  • M. Gusarova, I.I. Petrushina
    MEPhI, Moscow, Russia
  • V. Zvyagintsev
    TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
  
  This paper concerns numerical simulations and experimental investigation of multipacting discharge in accelerating cavities and feeding waveguide section of eLINAC accelerator. The threshold values of accelerating gradient and input power for discharge may occur in these structures have been obtained experimentally and compared to numerical predictions. Secondary emission influence on discharge behavior were also considered.  
 
MOPPA021 176 MHz Solid State Microwave Generator Design impedance, scattering, resonance, rf-amplifier 290
 
  • A.Yu. Smirnov, E.V. Ivanov, K.I. Nikolskiy, S.A. Polikhov, N.V. Tikhomirova
    Siemens Research Center, Moscow,, Russia
  • O. Heid, T.J.S. Hughes
    Siemens AG, Erlangen, Germany
  
  This paper concerns the R&D work upon design of a compact RF amplifier to be used for linear accelerators. The machine under development will operate at 176 MHz with output power of 25 kW in continuous wave regime. It consists of 48 push-pull PCB modules (approx. 500W output power each), connected in parallel to several radial filter rings, which both allow class-F operation and combine the power from the modules, delivering it to a single 50 Ω coax cable. The CST simulations and the results of 324 MHz test prototype measurements are presented.  
 
TUPPB001 Study of Dynamical Aperture of NICA Collider with Account of Magnetic Field Errors and Coulomb Effects collider, resonance, ion, synchrotron 304
 
  • P.R. Zenkevich, A. Bolshakov
    ITEP, Moscow, Russia
  
  By use of MADX code beam dynamics in NICA collider has been studied. NICA collider has comparatively small kinetic ion energies (1.5-5 GeV/u) that results in one beam Coulomb effects. These effects are simulated by set of "BEAM-BEAM" elements with appropriate chosen strength and location. Besides it was taken into account beam-beam interaction and influence of systematic and random errors of the magnetic field. The simulation results are given and discussed.  
 
TUPPB004 Development of Stochastic Cooling Technique for NICA Project pick-up, kicker, collider, ion 313
 
  • N. Shurkhno
    MSU, Moscow, Russia
  • A.G. Kobets, I.N. Meshkov, V.V. Seleznev, A.O. Sidorin, G.V. Trubnikov
    JINR, Dubna, Moscow Region, Russia
  • R. Stassen
    FZJ, Jülich, Germany
  
  The experiment on stochastic cooling at Nuclotron, initiated two years ago as a test bench for NICA collider, is progressing. Stochastic cooling system was constructed in 2011. Important results of runs performed at Nuclotron (December 2011 and March 2012) are the following: beam Shottky-noise in the energy range 0.5-4 GeV/u has been measured for deutron and carbon beams with new pick-up structure and methodology for notch-filter and system delay adjustments (open-loop measurements) have been tested. Afterwards the initial scheme was revised and significantly improved and now is being prepared for the experiment. This report presents the results of first stochastic cooling tests at Nuclotron, and further development of stochastic cooling system.  
 
TUPPB007 Transfer Channel from Booster to Nuclotron at the NICA Facility emittance, ion, booster, quadrupole 322
 
  • G.A. Filatov, I.N. Meshkov, V.A. Mikhaylov, A.O. Sidorin, N.D. Topilin, G.V. Trubnikov, A. Tuzikov
    JINR, Dubna, Moscow Region, Russia
  
  In the last years the Nuclotron-based Ion Collider fAcility (NICA) project is developed at Joint Institute for Nuclear Research (JINR), Dubna, Russia. Important elements of the NICA are two synchrotrons: Booster and Nuclotron. Connection between these synchrotrons is provided with the transfer channel for heavy ions at energy of 600 MeV/u. The transfer channel includes a stripping station and charge separation system. General goal of the optic design is to minimize emittance at the exit of the channel. Magnetic system of the channel will be constructed using magnets of the Nuclotron type.  
 
TUPPB008 SNOP – Beam Dynamics Analysis Code for Compact Cyclotrons cyclotron, space-charge, extraction, acceleration 325
 
  • V.L. Smirnov
    JINR/DLNP, Dubna, Moscow region, Russia
  • S.B. Vorozhtsov
    JINR, Dubna, Moscow Region, Russia
  
  The program complex intended for particle dynamic simulations in a compact cyclotron from an injection line to the extraction system is described. The main features of the program SNOP are usage of 3D electric and magnetic field maps, beam space charge effect calculation and analysis of the beam losses on structure elements of the facility under consideration. An optimal usage of the modern computer capabilities and graphic libraries for visualization is a key issue in the program development. The beam dynamic modeling results for various cyclotrons are presented.  
 
TUPPB009 RF Self–Consistent Electron Beam Dynamics Simulation in THz Generator Based on Photoinjector and Cherenkov Decelerating System radiation, beam-loading, acceleration, electron 328
 
  • T.V. Bondarenko, S.M. Polozov, O.A. Tatsyuk
    MEPhI, Moscow, Russia
  
  The generator of high intensity monochromatic radiation in sub-mm band is currently under R&D at the Department of Electrophysical Facilities of MEPhI. This generator is based on photoinjector and irradiating Cherenkov capillary. It is necessary to have high brightness electron beams to generate of monochromatic radiation in this type of structure. These beams can be produced by photocathode and accelerated to energy of several MeV using short structure having high rate of energy gain. Irradiating capillary represents metal tube having inner radius of the radiation wavelength order and covered with dielectric layer or made of corrugated waveguide. It's important to study the self-consistent dynamics of the beam during the acceleration as the pulse current is equal several A, i.e. the beam dynamics should be studied taking into account RF (radiation) field and Coulomb field of self space charge. Another task is to study the electron beam dynamics and fields irradiated by it in decelerating structure in the absence of external fields. The scheme of the facility, its operation mode and high-current beam dynamics simulation results in accelerating and irradiating structures are presented.  
 
TUPPB011 Analytical Approach for Beam Matching linac, ion, emittance, controls 334
 
  • V.S. Dyubkov, S.M. Polozov
    MEPhI, Moscow, Russia
  
  Charge particle beams transportation with small cross-sections and low energies is an actual problem for a gantry. That beams are used actively for isotope therapy. Beam emittance is its quality factor, and it should be matched with a facility channel acceptance. The method for beam dynamics analysis in lattice is developed in terms of non-coherent particle oscillation study. Nonlinear beam dynamics is investigated by using this method. It is shown that this technique allows one to realize effective beam emittance control. Analytical results obtained are verified by means of numerical simulation.  
 
TUPPB018 Simulation of Hollow Ion Beam Formation Line target, cavity, ion, quadrupole 353
 
  • H.Y. Barminova, N.N. Alexeev, A. Golubev, T. Kulevoy, A. Sitnikov, T. Tretyakova
    ITEP, Moscow, Russia
  
  Heavy ion beams can be used for the matter extreme state generation*, and forming line must satisfy to certain strict requirements for beam brightness and focus position. In paper** system was proposed for hollow beam formation in order to generate laboratory plasma with energy deposition in cylindrical target. The system is based on the principle of the beam rotation by means of RF-cavities (so called "wobbler"). The similar system is proposed in ITEP***, where the basic part of line consists of two four-cell cavities and focusing quadrupole triplet. To calculate wobbler and magnetic triplet parameters two codes were used – "Transit", developed in ITEP, and G4Beamline, developed in Muons Inc. The beam was simulated for two kinds of particles – multicharged ions of Со and protons with equivalent energy. A comparative analysis of optical system parameter and beam parameter obtained in both simulations was performed. In condition of focus position restriction and spot geometry required aberrations were shown to be taken into account correctly.
* V. Fortov et al. NIM A 415, p.20 (1998).
** S. Minaev et al. NIM A 620, р.99 (2010).
*** S. Kolesnikov et al. High Pressure Research, vol.30, No 1, p.83 (2010).
 
 
TUPPB024 Development of the Object-oriented Program in C ++ for Simulation of Beam Dynamics in Accelerator Injection Systems injection, controls, emittance, focusing 364
 
  • S.A. Kozynchenko
    St. Petersburg State University, St. Petersburg, Russia
  
  At present, more and more attention is paid to the design and creation of accelerator systems for precision beams. Their injection systems in many aspects determine the output characteristics of the beam, so the questions of the design of such systems are of great importance. In such cases both simulation and optimization of beam dynamics in electromagnetic fields close to real may be necessary. In this paper the program for simulation and optimization of beam dynamics in injection systems is considered, which at the same time allows the choice of parameters of the accelerating-focusing system. This permits designing the injection system during optimization process, taking into account the required output characteristics of the beam. The given program is based on Win 32 API dialog boxes and is developed in standard C++, using parallel programming tools based on the MPI-1.  
 
TUPPB025 Investigation of Program and Perturbed Motions of Particles in Linear Accelerator controls, electron, rfq, resonance 367
 
  • I.D. Rubtsova, E.N. Suddenko
    St. Petersburg State University, St. Petersburg, Russia
  
  Beam control model for program and perturbed motions with interaction account is realized. Quality functional gradient is obtained.  
 
TUPPB026 Comparison of Matrix Formalism and Step-by-step Integration for the Long-term Dynamics Simulation in Electrostatic Fields lattice, electromagnetic-fields, storage-ring, controls 370
 
  • A.N. Ivanov
    St. Petersburg State University, St. Petersburg, Russia
  
  An approach based on matrix formalism for solving differential equations is described. Effective in sense of performance matrix formalism can be tested with less efficient, but accurate traditional algorithm of numerical simulation based on the Runge-Kutta scheme. In both cases the symplectic version of the algorithms are used. The results coincide to analytical calculations, but some disagreements have been identified. The approach implementation is demonstrated in the problem of long-term spin dynamics in electrostatic fields.  
 
TUPPB028 Degenerate Solutions of the Vlasov Equation electromagnetic-fields 376
 
  • O.I. Drivotin
    St. Petersburg State University, St. Petersburg, Russia
  
  The report deals with degenerate solutions of the Vlasov equation. By degenerate solution we mean a distribution which have support of dimension smaller than dimension of the phase space. Well known example is the Kapchinsky-Vladimirsky (KV) distribution, when particles are distributed on the 3-dimensional surface in the 4-dimensional phase space. We use covariant formulation of the Vlasov equation developed previously*. In traditional approach, the Vlasov equation is considered as integro-differential equation with partial derivatives on phase coordinates. Covariant approach means tensor formulation. For the covariant formulation of the Vlasov equation, we use such tensor object as the Lie derivative. According to the covariant approach, a degenerate solution is described by differential form which degree is equal to the dimension of its support. Main attention is paid to the KV distribution, which is described by the differential form of the third degree. It is demonstrated that the KV distribution satisfies to the Vlasov equation in covariant formulation. It is shown, how one can set initial partical positions in the phase space to simulate that distribution. Some other distributions are also considered. This work has theoretical as well as practical significance. Presented results can be applied for description and simulation of high-intensity beam.
O.I. Drivotin. Covariant Formulation of the Vlasov Equation.
Proc. of IPAC 2011, San-Sebastian, Spain.
http://accelconf.web.cern.ch/AccelConf/IPAC2011/papers/wepc114.pdf
 		 
 
TUPPB029 Transverse Dynamics of a Ring Beam in a Coaxial Two-Channel Dielectric Waveguide wakefield, vacuum, acceleration, radiation 379
 
  • A. Altmark
    LETI, Saint-Petersburg, Russia
  • A. Kanareykin
    Euclid TechLabs, LLC, Solon, Ohio, USA
  
  The most critical issue of wakefield accelerating schemes is transformer ratio (maximum energy gain of the witness bunch/maximum energy loss of the drive bunch) which cannot exceed 2 in collinear wakefield accelerator with use of Gaussian bunches. We observe new scheme of wakefield acceleration in collinear two-channel waveguide where accelerating field created by electron bunch with annular charge distribution passing in vacuum layer. This radiation is used for acceleration of witness beam which passing through central vacuum channel. These vacuumareas separated by dielectric tube. Transformer ratio for this scheme can be much greater than 2. The main problem of wakefield accelerators is transverse beam dynamics of the driver bunch, because of high value of its charge and low energy of the particles. We present results of the beam dynamics calculation of the annular drive beam by "macroparticle" method based on analytical expressions for Cerenkov radiation. The upgraded BBU-3000 code has been used for calculation of the beam dynamics in coaxial dielectric wakefield accelerating structures. It is shown that dynamics depends on radial and azimuthally structures of HEM modes excited by the drive beam there. Initial beam imperfections to the beam dynamics was carried out.  
 
TUPPB030 Computer Simulation of the Electron Beam Energy Spectrum Measurement by the Magnetic Analyzer Method Based on Scanning System of the Sterilization Installation electron, induction, acceleration, radiation 382
 
  • P.A. Bystrov, M.A. Alekseev, N.E. Rozanov
    MRTI RAS, Moscow, Russia
  
  A method for measuring the characteristic, which makes possible to find the energy spectrum of the electron beam of the accelerator is described. This method uses the magnetic analyzer, which is based on the scanning system of the standing wave linear electron accelerator, mounted on the radiation sterilizer. This characteristic is the dependence of beam current, that reaches the induction sensor at the accelerator output window, on the magnetic field, deflecting the beam from the axis of the system. The results of the measurements of these characteristic, which were performed on the sterilization installation in MRTI, are presented. The computer simulation of electron beam dynamics in the scanning system for the case of these experiments was performed with the help of developed program "BEAM SCANNING". The similar dependence of the beam current on the magnetic field was obtained. The necessity of taking into account the effect of electron reflection from the walls of vacuum chamber is stated. To describe this effect the additional features were implemented in the program. As a result of calculations with the account of this effect, the correspondence of the calculated curve and experimental one was reached. This means that the calculated spectrum corresponds to the actual energy spectrum of the electron beam in the experiment.  
 
TUPPB043 Program Complex for Vacuum Nanoelectronics Finite Element Simulations electron, cathode, vacuum, gun 409
 
  • K.A. Nikiforov, N.V. Egorov
    St. Petersburg State University, St. Petersburg, Russia
  
  The program complex in MATLAB intended for vacuum nanoelectronics simulations is described. Physical and mathematical models, computational methods and algorithms of program complex are presented. Electrostatic simulation of electron transport processes is discussed under electron massless approximation; current function method and Matlab PDE Toolbox finite element solutions are used. Developed program complex is able to simulate diode and triode structures with complicated submicron geometry, current-voltage characteristics, calculate electric field distribution, estimate electric line interaction. The modelling results by the example of two different triode structures are presented. Matlab stand-alone application with graphical user interface for demonstration purposes is presented.  
 
WEPPC001 A Simulation Study on Accelerator Cavities for a SW Linac cavity, impedance, coupling, linac 445
 
  • N. Khosravi
    Zanjan University, Zanjan, Iran
  • E.E. Ebrahimibasabi, S.A.H. Feghhi
    sbu, Tehran, Iran
  
  An on axis-coupled cavity structure has been studied using S-band microwaves at 2856 MHz, suitable for industrial and research applications. It uses a bi-periodic SW structure with constant impedance that operates at pi/2 mode. This structure consist Kidney-like shaped slots, placed symmetrically with respect to the accelerating axis. We compared Different shapes, places and sizes of slots with respect to coupling coefficient, resonance frequency and some of cavity parameters. Sensitivity analyses of accelerating cavity on details of structure have been done and their behavior, with respect to the resonance frequency has been presented. According to the simulation result using SUPERFISH and CST Studio package, each accelerating cavity is capable to deliver 0.56 MeV to electrons in a 50 mA beam.  
 
WEPPC008 Biperiodic Accelerating Structure with Inner Coupling Cells with an Increased Coupling Coefficient coupling, cavity, multipactoring, linac 458
 
  • M. Gusarova, I.I. Petrushina, E.A. Savin, N.P. Sobenin, D.B. Tikhonov
    MEPhI, Moscow, Russia
  
  Results on coupling increase research for biperiodic accelerating structure featuring high effective shunt impedance and other electrodynamical characteristics are presented. Accelerating structure for sample facility was designed taking into consideration thermal issues and multipactor discharge immunity.  
 
WEPPC009 Using Genetic Algorithms for Electrode Shape Optimization in Accelerators with RF Focusing focusing, linac, acceleration, controls 461
 
  • A.V. Samoshin, K.A. Aliev, S.M. Polozov
    MEPhI, Moscow, Russia
  
  The drift tubes shape choice which provides the require distribution of the spatial harmonics amplitudes of RF field is an important problem in the design of RF focusing accelerators. It is necessary to have various relationships of the main (accelerating) and the first (as main focusing) harmonics of RF field for different types of accelerators. High order harmonics should be negligible for accelerators with an external focusing, and this ratio should be E1/E0 = 3-5 for the efficient operation of the axially symmetric RF focusing accelerator. Thus, the distribution and harmonic amplitude's ratios at the accelerator axis which provides stable beam dynamics are always known. The drift tubes shape study problem cannot be solved directly by ordinary methods because of unknown boundary conditions belongs to a class of ill-posed problem. At present, this problem can be solved by using genetic algorithms (GA). For this purpose, the electrode shape will be represent as the polynomial function, and then solve the Laplace equation with boundary conditions of Dirichlet and Neumann. The necessary electrodes shape can be quickly and easily simulated using the adaptive search.  
 
WEPPC010 H-Cavity Based Accelerating Structure for Proton Accelerator impedance, proton, linac, cavity 464
 
  • M.V. Lalayan, A.A. Kalashnikova, S.E. Toporkov
    MEPhI, Moscow, Russia
  
  Funding: Work is supported by "scientific stuff" grant of The Ministry of Education and Science of the Russian Federation
Cavity for proton accelerator operating in 0.01 to 0.04 phase velocity range optimization results with respect to electrodynamical parameters are presented. H-type based cavity for two operating frequencies 145 MHz and 433 MHz was considered. Influence of cavity shape and dimensions on most important EDCs – relative shunt impedance, quality factor and transient time factor was studied. Influence of high order modes on beam dynamics was considered. 		 
 
WEPPC013 Novel DTL Section for ITEP-TWAC Heavy Ion Injector rfq, quadrupole, ion, DTL 469
 
  • V. Andreev, N.N. Alexeev, A. Kolomiets, V.A. Koshelev
    ITEP, Moscow, Russia
  • A.S. Plastun
    MEPhI, Moscow, Russia
  
  A novel 81.5 MHz H-type drift tube (DTL) accelerating structure with rf quadrupoles following RFQ in the new injector I-4 for acceleration ions up to energy about 5 MeV/u for ITEP TWAC facility has been proposed. It is based on a combination of a DTL structure and the resonator with magnetic coupling windows. Computer simulations show that it can provide some advantages in comparison with conventional IH-DTL structure. Results of both electrodynamics and beam dynamics computer simulations of the structure as well as a new approach for beam matching RFQ and the section are presented.  
 
WEPPC014 Performance of the Magnetic System of a 12 MeV UPC Race-Track Microtron factory, dipole, microtron, vacuum 472
 
  • I. Vladimirov
    MSU SINP, Moscow, Russia
  • I.V. Chernov, V.V. Zacharov
    Elamt-PM, Kaluga, Russia
  • Yu.A. Kubyshin, J.P. Rigla
    UPC, Barcelona, Spain
  • N.I. Pakhomov, V.I. Shvedunov
    MSU, Moscow, Russia
  
  The performance of the magnetic system of a 12 MeV electron race-track microtron (RTM) which is under construction at the Universitat Politècnica de Catalunya (UPC) is described. The RTM magnetic system consists of two four-pole end magnets with the main field level about 0.8 T, one quadrupole and four beam extraction dipoles. As a source of the magnetic field in these magnets a Sa-Co rare earth permanent magnet material is used. This helps to get a quite compact design of the RTM and allows to place the magnetic systems in a high vacuum environment of the accelerator vacuum chamber. We discuss results of numerical simulations of the tuning of the end magnets by mean of special tuners and describe their engineering design which permits to assemble the magnets and fix the Sa-Co blocks without gluing. Also a method and results of magnetic field distribution measurements and magnet tuning are reported.  
 
WEPPC015 Highly Accurate 3D Modeling of the C-80 Isochronous Cyclotron Magnetic Structure cyclotron, ion, extraction, H-minus 475
 
  • S.A. Artamonov, A.N. Chernov, E.M. Ivanov, G.A. Riabov
    PNPI, Gatchina, Leningrad District, Russia
  
  The very complicated magnetic structure with extremely high spiral angle and set of 17 correction shim types in each of 8 sectors is used in the H-minus ion isochronous cyclotron C-80. The 3D code MERMAID was applied to optimize geometry of the sectors and shims in the hill and value region. A precision finite-element model allows take into account the iron non-linear effects and the detailed magnet geometry. MERMAID makes use about 20.5 millions nodes and provides magnetic field calculation accuracy in 10-20 Gs. The integral magnetic field parameters (isochronism, transversal motion frequency, H-minus ion electromagnetic dissociation) have been optimized by using the trajectory analyses. Program provides the significant reduction the time and efforts for the determination the necessary shims set in comparison with trial-and-error method.  
 
WEPPC016 Update of Classical Cyclotron U-150 Magnetic System. Simulation and Experiment cyclotron, vacuum, ECR, proton 478
 
  • N.S. Azaryan, Yu.G. Alenitsky, A. Chesnov, O. Lepkina, E. Samsonov, I.M. Sedych, V.L. Smirnov
    JINR, Dubna, Moscow Region, Russia
  • I.R. Gulamov, Z.V. Shukurov, R.A. Umerov, Ya.M. Uzakov
    Uzbekistan Academy of Sciences, The Institute of Nuclear Physics, Tashkent, Uzbekistan
  
  Classical cyclotron U-150 located in the Academy of Sciences of the Republic of Uzbekistan, Tashkent, was developed more than 50 years ago in Efremov’s institute for acceleration various particles (p, d, He). For magnetic field re-tuning the current coils are used. Nowadays U-150 is used to accelerate only protons to energy of 15-22 MeV for producing isotopes for medical or industrial applications. In order to save the electrical energy and operating simplification it is proposed to create a decreasing average magnetic field in cyclotron only by means of ferromagnetic parts. To create a negative gradient of the magnetic field steel parts are made and installed in the magnet. Analysis of measurement results showed the possibility of production of the required isotopes in updated U-150 with power economy of about 15%. Experimental irradiation of the target showed that the created field gradient did not provide an achievement of the required proton energy at radius of 64-65 cm. To achieve required energy one correction coil is kept in operation and measured magnetic field showed a satisfactory result. For estimation of possibility of creating the required magnetic field gradient without correction by coils the simulation of the cyclotron magnetic system were done and the results of calculations and its analysis are presented in this paper.  
 
WEPPC018 Fast Kicker kicker, impedance, vacuum 483
 
  • V.V. Gambaryan, A.A. Starostenko
    BINP SB RAS, 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 to kicker design was offered. The possibility for set of wires using instead of plates using is considered. This approach allows us to reduce the effective plate surface. In this case we can decrease effects related to induced charges and currents. In the result of modelling optimal construction was developed. It includes 6 wires (two sets in threes). Wires are 2 mm in cross-section. The magnet aperture is about 5 cm. Integral magnet length is about 1 meter. This length can be obtained by single magnet or by multiplied length of magnets array. Calculated field rise time (about 1.5 ns) satisfies the conditions. Induced current effect reducing idea was confirmed. For configuration with 3 wires pair (with cross section of 2 mm) induced current in one wire is about 10% and in the wall is about 40%. However for design with plates current is about 40% and 20% respectively. Obtained magnet construction allows controlling of high field homogeneity by changing currents magnitudes in wires. In general we demonstrated the method of field optimization. Summary. Optimal kicker design was obtained. Wires using idea was substantiated.  
 
WEPPC024 Design, Simulation and Optimization of a Solenoid for ES-200 Electrostatic Accelerator solenoid, focusing, target, proton 498
 
  • M. Asgarpour, E.E. Ebrahimibasabi, S.A.H. Feghhi, M. Khorsandi
    sbu, Tehran, Iran
  • N. Khosravi
    Zanjan University, Zanjan, Iran
  
  Solenoids have important role in focusing the beam in drift tube of charge particle accelerators. In order to optimize the beam current in ES-200, an electrostatic proton accelerator at Shahid Beheshti University, design and simulation of a suitable solenoid has been performed. Using CST Studio package, simulation results has been validated in comparison with theoretical formula. According to the results we optimized the design using CST to have minimum beam current on drift tube.  
 
WEPPC037 Cylindrical Phased Dipoles Array for Hyperthermia of Deep-Situated Tumors dipole, radiation, electromagnetic-fields, radio-frequency 521
 
  • A.M. Fadeev, V.N. Belyaev, S.M. Polozov
    MEPhI, Moscow, Russia
  • E.A. Perelstein
    JINR, Dubna, Moscow Region, Russia
  
  The treatment of deep-situated malignant tumors is often a difficult problem in which the purpose is to reduce the size of completely remove a tumor by using one or more modalities. The traditional methods are: radiation therapy, chemotherapy and surgery. Hyperthermia is another method which is used alone or coupled with other methods of cancer treatment. Hyperthermia is a heating of the tumor that makes it more sensitive to chemotherapy or radiation therapy and leads to it thermal damage. Temperature range for hyperthermia treatment is from 42.5 C to 45 C. It is important to prevent heating of healthy tissues and to produce sufficient heating at the site of a deep-situated tumor. This kind of hyperthermia is called the local hyperthermia. The electromagnetic field in 100-200 MHz frequency range is optimal for heating of deep-situated tumors. The system for local hyperthermia of cancer was simulated. This system is based on cylindrical phased array consisting of multiple dipole antennas with operating frequency 150 MHz. The electric fields and specific absorption rate distributions are calculated in cut of tissue-equivalent phantom. Shown that electric field can be focused in desirable region by means of varying of amplitudes and phases of each dipole. The advantages of using combined therapy of common hyperthermia with chemotherapy or radiation therapy are discussed.  
 
WEPPC042 Design Parameters of Biperiodic Accelerating Structure for Medical Linac with Widely Variable Energy electron, injection, coupling, medical-accelerators 529
 
  • Yu. Zuev, M.A. Kalinichenko, V.V. Terentiev
    NIIEFA, St. Petersburg, Russia
  
  Results on the simulation of beam dynamics in an accelerating structure with regulation of particle energy from 6 to 21 MeV are presented. The structure operates in the standing wave mode, consists of two weakly coupled substructures and resonates at closed frequencies f1 , f2. In-phased electromagnetic field oscillations take place in the substructures at frequency f1, whereas anti-phased oscillations occur at frequency f2. Main features of the accelerating structure are electronic control of the beam energy and possibility to form narrow energy spread at both frequencies.  
 
WEPPD002 Simulations and Design of THz Wiggler for 15-40 MeV FEL wiggler, electron, radiation, power-supply 569
 
  • E. Syresin, S.A. Kostromin, R.S. Makarov, N.A. Morozov, D. Petrov
    JINR, Dubna, Moscow Region, Russia
  
  The electromagnetic wiggler is applied for narrow-band THz radiation in the 30 mkm to 9.35 mm wavelength range. This is a planar electromagnetic device with 6 regular periods, each 30 cm long. The end termination pattern structure is +1/4,-3/4,+1,…,- 1,+3/4,-1/4. This structure is more appreciable for compensation of the first and second fields, especially, to provide the small value of of second integral of 500 G*cm2. The peak magnetic field is up to 0.356 T, it is defined by large wiggler gap of 102 mm and available capacity of water cooling system of 70 kW. The parameter is varied in the range K=0.5-7.12 corresponding to a field range B=0.025-0.356 T peak field on axis. The wiggler is used in 15-40 MeV at beam currents up to 1.6 mA. The bunch compression scheme allows the whole wavelength range to be covered by super-radiant emission with a sufficient form factor. The wavelength range corresponds to 217 mkm - 9.35 mm at electron energy of 15 MeV, it is equal to 54 mkm - 2.3 mm at electron energy of 30 MeV and it is 30 mkm - 1.33 mm at electron energy of 40 MeV. The 3D Opera simulations and design of THz wiggler is under discussion.  
 
WEPPD004 Longitudinal Stability of ERL with Two Accelerating RF Structures linac, electron, RF-structure, cavity 575
 
  • Ya.V. Getmanov, O.A. Shevchenko
    BINP SB RAS, Novosibirsk, Russia
  • N. Vinokurov
    KAERI, Daejon, Republic of Korea
  
  Modern Energy Recovery Linac (ERL) projects use superconductive accelerating radio-frequency structures (RF). Their RF quality is typically very high. Therefore, the RF voltage induced by electron beam is also high. In ERL the RF voltage induced by the accelerating beam is almost cancelled by the RF voltage induced by the decelerating beam. But, a small variation of the RF voltage may cause the deviations of the accelerating phases. These deviations then may cause further voltage variation. Thus, the system may be unstable. The stability conditions for ERL with one accelerating structure are well known. The ERL with split RF structure was discussed recently. The stability conditions for such ERLs are discussed in this paper  
 
WEPPD045 Optimization of the Detector Geometry and Data Processing Algorithms for FAIR CR BPMs antiproton, monitoring, injection, impedance 644
 
  • A.Y. Orlov, S.V. Barabin, T. Kulevoy, D.A. Liakin
    ITEP, Moscow, Russia
  
  A beam diagnostic is an important part of all FAIR accelerators and storage rings. A small flux of antiprotons in the collector ring CR (108 particles in a store ring) as well as dominated at first turns p-meson component of a beam require careful design for all elements of the beam position monitoring system. To increase a BPM resolution and sensitivity we propose a compact multi-electrode design of the position detector, matched low-noise electronics in connection with dedicated enhanced digital data processing algorithms. Here we present a comprehensive set of aspects of a preliminary design of the BPM system for FAIR CR.  
 
WEPPD047 The Optimization of RF Deflector Input Power Coupler coupling, emittance, electron, diagnostics 650
 
  • A.Yu. Smirnov, O.A. Adonev, N.P. Sobenin
    MEPhI, Moscow, Russia
  • A.A. Zavadtsev
    Nano, Moscow, Russia
  
  This paper concerns the investigation of different types of input power cell for S-band RF electron deflector. This device serving for slice emittance diagnostics is a disc-loaded waveguide which operates with TE11-like wave in traveling wave regime with 120 deg phase shift per cell. Since this deflector meets the restriction on its length and has to provide high enough deflecting potential to a particle during its flight time it is significant to increase the transversal field strength in coupling cell or to shorten it so that the deflecting potential remains constant. The total structure consists of 14 regular cells and two couplers. As it is now all cells have the same length equal to D=33.34 mm and the field in couplers is lower than that of regular cells. In this paper different length are considered and numerically simulated in order to choose the best one.  
 
WEPPD049 Software for Virtual Accelerator Environment controls, lattice, EPICS, space-charge 653
 
  • N.V. Kulabukhova
    St. Petersburg State University, St. Petersburg, Russia
  
  The article discusses appropriate technologies for software implementation of the Virtual Accelerator. The Virtual Accelerator is considered as a set of services and tools enabling transparent execution of computational software for modeling beam dynamics in accelerators on distributed computing resources. Control system toolkits EPICS, realization of the GUI with existing frameworks and visualization of the data are discussed in the paper. The presented research consists of software analysis for realization of interaction between all levels of the Virtual Accelerator.  
 
WEPPD050 Approximate Method for Calculation of Field of Charged Particle Moving through Dielectric Object radiation, vacuum, diagnostics, plasma 656
 
  • E.S. Belonogaya, S.N. Galyamin, A.V. Tyukhtin
    Saint-Petersburg State University, Saint-Petersburg, Russia
  
  Cherenkov radiation is widely used for particle detection. As well, it is prospective for particle bunch diagnostics. Therefore, it is actual to elaborate methods for calculation of the fields of bunches moving in the presence of different dielectric objects. We offer the approximate method based on calculation of the field in unbounded medium and accounting of boundary influence by geometrical optics. First, we consider the problem concerning the field of charge crossing a dielectric plate. This problem has an exact solution. It is used as a "test" problem for estimation of precision of the approximate method. Computation of the field is performed using both methods and the results have a good agreement. Further, we analyze the cases of more complex objects, in particular, a dielectric cone. Note, that the offered method allows to obtain wave fields using neither complex analytical transformations nor laborious numerical calculations.  
 
WEPPD061 Design and Simulation of a New Faraday Cup for ES-200 Electrostatic Accelerator electron, proton, ion, high-voltage 682
 
  • E.E. Ebrahimibasabi, S.A.H. Feghhi, M. Khorsandi
    sbu, Tehran, Iran
  
  Faraday Cups have been used as diagnostic tools to measure the charged particle beam current directly. Up to now, different designs have been introduced for this purpose. In this work a new design of Faraday Cup for ES-200 accelerator, a proton electrostatic accelerator which is installed at Shahid Beheshti University, has been performed. FC's dimensions and desirable material were considered Based on the ES-200 beam characteristics (maximum energy of 200 keV and maximum current of 500 mkA). Thickness and dimensions of FC has been calculated by SRIM code according to the range of proton and induced electrons. MCNPX Monte Carlo code was used in order to simulate the angular dispersion and flux of back scattered and secondary electrons that are produced in collision of energetic protons. The Appropriate FC geometry specifications have been calculated by using MCNPX code. Final Simulation and validation of the FC performance has been done by using CST Studio package. In addition, the heat power generated due to proton collision with FC has been calculated analytically and the required cooling system has been designed by ANSYS. Results showed that the new designed Faraday Cup has a good performance to measure the proton beam produced by ES-200 ion accelerator.