Keyword: vacuum
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TUBCH02 Simulation of Beam Dynamics in the Extraction System of the JINR Phasotron extraction, proton, simulation, 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]  
 
WEBOR02 Some Design Features of the 80 MeV H− Isochronous Cyclotron at Gatchina cyclotron, focusing, extraction, injection 109
 
  • G.A. Riabov, S.A. Artamonov, E.M. Ivanov, G.F. Mikheev, Yu.T. Mironov, B.B. Tokarev
    PNPI, Gatchina, Leningrad District, Russia
  • V.G. Mudrolyubov
    NIIEFA, St. Petersburg, Russia
  
  To minimize the expenditures while designing the cyclotron an attempt was made to use at most the existing synchrocyclotron infrastructure, i.e. the building with the radiation shielding, the bridge crane for 30 tones, the electric power, water cooling, ventilation systems, etc. The iron yoke of the existing synchrocyclotron magnet model is used for a magnet system. The special magnetic structure with very low value of the flatter 0.025 and extremely high spiral angle about 60 degree in the radii range from 0.3 up to 0.9 m was developed to provide acceleration of H-minus ions up to energy 80 MeV in the magnet with extraction radius 0.9 m. Special attention was paid to thoroughly study effects of the highly spiraled structure: decrease of the flatter with introduction of the spiral angle, discrepancy between the magnetic and geometrical spiral angles, the spiral angle inefficiency in the cyclotron central region.  
slides icon Slides WEBOR02 [1.952 MB]  
 
WEZCH01 ITEP-TWAC Renewal and Upgrading Program ion, proton, acceleration, injection 112
 
  • N.N. Alexeev, P.N. Alekseev, V. Andreev, A. Balabaev, A.I. Balabin, V.N. Balanutsa, A. Golubev, M.M. Kats, V.I. Nikolaev, A.S. Ryabtsev, Yu.A. Satov, V.A. Schegolev, B.Y. Sharkov, A. Shumshurov, V. Stolbunov, V.P. Zavodov
    ITEP, Moscow, Russia
  
  The ITEP-TWAC facility has been put out of operation this year as a result of some equipment damage by the fire, so the program of machine renewal and its equipment upgrading for accelerated beams parameters improvement and experimental area extension is elaborated. Main items of this program and status of machine restoration activity are presented.  
slides icon Slides WEZCH01 [3.050 MB]  
 
THACH01 Indirect Cooled Superconductive Wiggler Magnet wiggler, damping, cryogenics, ion 140
 
  • K. Zolotarev
    BINP SB RAS, Novosibirsk, Russia
  
  Superconducting wigglers are very popular devices for generation of the synchrotron radiation in the hard X-ray spectral range. The one direction of the future progress in wigglers development is reducing of the technical complexity wigglers design as well as technical service for cryogenic system. The BINP wigglers without liquid helium consumption were a noticeable milestone of these efforts. The next significant step toward additional simplification wiggler design and service is indirect cooling of the wiggler magnet. In this case the wiggler magnet not sinked into the liquid helium, but cooled by thermal connection link with the head of cryogenic cooler. This approach is used for design of the indirect cooled wiggler for IMAGE beamline on the ANKA light source (KIT, Germany). This wiggler also will be tested as a prototype for damping wiggler for the damping rings in the project of the Compact Linear Collider (CLIC) for CERN. This report summarizes some details of the wiggler design as well as a result of the short prototype testing.  
slides icon Slides THACH01 [3.073 MB]  
 
THAOR01 Superconducting Quadrupole Module System for the SIS100 Synchrotron quadrupole, dipole, sextupole, multipole 143
 
  • E.S. Fischer, O.K. Kester, J.P. Meier, A. Mierau, P. Schnizer, P.J. Spiller, K. Sugita
    GSI, Darmstadt, Germany
  • H.G. Khodzhibagiyan, G.V. Trubnikov
    JINR, Dubna, Moscow Region, Russia
  
  The SIS100 heavy ion synchrotron, the core machine of the FAIR complex, uses fast ramped superconducting magnets. As for its ancestor, the Nuclotron operational at JINR Dubna since 1993, its superconducting magnets are based on iron dominated design and coils made of Nuclotron type cables. The SIS100 magnets differ from the Nuclotron magnets in the following points: they are longer, the field aperture was enlarged and the field quality improved, its AC losses reduced. The coils have a lower hydraulic resistance and the operation current is doubled. These achievements were obtained in a R&D collaboration between JINR and GSI. Now in the realization phase GSI will procure and test the SIS100 dipole magnets, while JINR together with GSI will finalize the design of the quadrupoles units (consisting of one quadrupole and one corrector), procure, test and assemble them into doublets. We report on the status of the project, the scheme of the JINR-GSI collaboration for developing and manufacturing the SIS100 quadrupole modules and the steps required to achieve the start of the series production.  
slides icon Slides THAOR01 [4.337 MB]  
 
THBCH02 Beam Extraction System for Industrial Electron Accelerator ILU-14 electron, extraction, radiation, controls 161
 
  • V.V. Bezuglov, A.A. Bryazgin, B.L. Faktorovich, E.N. Kokin, V.M. Radchenko, E.A. Shtarklev, A. YU. Vlasov
    BINP SB RAS, Novosibirsk, Russia
  
  This paper describes beam extraction system for pulse linear electron accelerator ILU-14 with energy range 7.5-10 MeV and beam power up to 100 kW. The main aim of this work was to achieve the uniform dose field in radiation zone. Admissible dose nonuniformity is of no more than ± 5% along the scanning length up to 1 m (if necessary, the scanning length may be reduced). Geometrical and electron-optical characteristics of all the beam channel elements were optimized after computer simulation of electron trajectories. To achieve the required nonuniformity of dose field additional electromagnets were installed. These magnets realize beam focusing and centering of the beam endwise of the channel, as well as correction of the scanning field. Control system of magnets power supply allows the online correction of electron beam.  
slides icon Slides THBCH02 [0.403 MB]  
 
FRXOR02 Beam Diagnostic Instrumentation for the NSLS-II Booster booster, diagnostics, controls, radiation 186
 
  • V.V. Smaluk
    BNL, Upton, Long Island, New York, USA
  
  For the NSLS-II synchrotron light source, a Booster synchrotron has been designed and produced by Budker Institute of Nuclear Physics. The Booster accelerates an electron beam from 200 MeV up to 3 GeV in both single-bunch and multi-bunch modes with repetition rate of 1 Hz. Accurate measurements of beam parameters are required during every work cycle to provide feed-forward tuning of the Booster. A set of beam diagnostic instruments has been developed for the Booster commissioning and operation. Six fluorescent screens are used for the first-turn beam observation. Electrostatic BPMs with signal processing electronics developed by BNL provide measurements of closed orbit and lattice functions as well as single-pass beam measurements for commissioning. A DC current transformer is used to measure average beam current and lifetime; the filling pattern is monitored by a fast current transformer. Two light-output ports are set up for observation of the beam image. Tune measurement system provides frequent measurements of betatron tunes during the energy ramp. Design and performance of the Booster beam instrumentation are presented; the commissioning plan is also discussed.  
slides icon Slides FRXOR02 [5.121 MB]  
 
FRACH03 The CC1-3 Cyclotron System cyclotron, ion, controls, power-supply 191
 
  • V.G. Mudrolyubov, A.V. Galchuck, Yu.N. Gavrish, S.V. Grigorenko, V.I. Grigoriev, L.E. Korolev, M.T. Kozienko, A.N. Kuzhlev, V.I. Ponomarenko, V.D. Shiltsev, Yu.I. Stogov, A.P. Strokach, S.S. Tsygankov, I.N. Vasilchenko
    NIIEFA, St. Petersburg, Russia
  • P. Beličev, A. Dobrosavljević, N. Nešković, V. Vujović
    VINCA, Belgrade, Serbia
  
  A СС1-3 cyclotron system has been designed to be installed in the Vinca Institute of Nuclear Sciences, Belgrade, Serbia. This system will be operated in the laboratory of nuclear-physical methods of the elemental analysis. The system includes a compact cyclotron and a system for beam shaping with specified energy characteristics. The cyclotron ensures the acceleration of negative hydrogen ions up to energy in the range from 1 to 3 MeV and a beam of protons is extracted by stripping on a thin carbon foil. The beam-shaping system ensures the beam of protons with a spectrum width not more than 0.1%. The main unit of the beam-shaping system is a magnetic analyzer with a bending angle of 270 deg. To date, the equipment of the cyclotron system has been manufactured and tests have been carried out on test facilities in the D.V. Efremov Institute. Installation will be performed in 2012.  
slides icon Slides FRACH03 [0.684 MB]  
 
FRBOR03 Non-gated Field Emission Array as Low-Energy Electron Source: Experiment and Simulation cathode, high-voltage, electron, simulation 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.  
 
FRBCH03 High Voltage ELV Accelerators for Industrial Application (Family of Accelerators and Tendency of Development) electron, ion, extraction, high-voltage 227
 
  • B.S. Han, W.G. Kang, S.M. Kim
    EB TECH Co. Ltd., Daejeon, Republic of Korea
  • N.K. Kuksanov, R.A. Salimov
    BINP SB RAS, Novosibirsk, Russia
  
  Due to the necessity of pilot scale test facility for continuous treatment of wastewater and gases on the spot, a mobile electron beam irradiation system mounted on a trailer has developed in EB TECH Co. Ltd. and Budker Institute of Nuclear Physics. This mobile electron beam irradiation system is designed for the individual field application with self-shielded structure of steel plate and lead block which will satisfy the required safety figures of ICRP. Design parameters are limited by the allowable total weight and height of the trailer on the road which controlled by National Authorities. Therefore, the output parameter of electron beam is designed for 0.7 MeV and 20 kW through 600 mm window. Shielding of a mobile electron accelerator has been examined by Monte Carlo technique (MCNP code). Calculations using two different versions (version 4c2 and version 5) of MCNP showed agreements within statistical uncertainties, and the highest leakage is far below the tolerable radiation dose limit. This mobile unit will be used for on-site test of liquid waste and gaseous waste in Saudi Arabia by Saudi ARAMCO and U.S.A. by PELE Technology Inc. together with EB TECH Co. Ltd. This unit could treat up to 500m3 of liquid waste per day or 10,000 Nm3 of gases per day.  
slides icon Slides FRBCH03 [11.807 MB]  
 
FRBCH04 VITA Based Neutron Source - Status and Prospects neutron, target, proton, ion 230
 
  • S.Yu. Taskaev, V.I. Aleynik, A.G. Bashkirtsev, B.F. Bayanov, M.V. Kamkin, D.A. Kasatov, A.S. Kuznetsov, A.N. Makarov, I.M. Schudlo, I.N. Sorokin, M.A. Tiunov
    BINP SB RAS, Novosibirsk, Russia
  
  Funding: Ministry of Education and Science of Russian Federation (grant 16.518.11.7038)
At the BINP, a pilot epithermal neutron source is now in use. It is based on a compact Vacuum Insulation Tandem Accelerator and uses neutron generation from the reaction 7Li(p,n)7Be. Generation of neutrons was established and in vitro experiments were held. Most recent investigations on the facility are related with: i) studying the dark currents and breakdowns, ii) analyzing and suppressing the high intensity dark currents, iii) measuring the intensity and the spectra of the X-ray radiation, iv) optimization of the H-beam injection into the accelerator, v) placing and calibrating the new gas stripping target. The results of these studies are discussed in the present work. Investigations resulted in increasing of mean current of the proton beam in stable mode (from 0.1 – 0.7 to 1.5 - 2 mA). In the nearest future new experiments are planned, including in vitro tests, blistering investigation, spectrum and flux measuring for neutrons and gamma, calculating the dose absorbed by phantom. Different ways of providing additional stability to the accelerator, of increasing the current of the proton beam are discussed in this work, as well as the ways of creating the therapeutic beam and strategies of applying the facility for clinical use. 		 
slides icon Slides FRBCH04 [2.526 MB]  
 
MOPPA001 Excitation of the Focusing Wakefields by a Relativistic Bunch in Isotropic Capillary Discharge Plasma plasma, focusing, wakefield, electron 242
 
  • R.R. Kniaziev, G.V. Sotnikov
    NSC/KIPT, Kharkov, Ukraine
  
  At present work excitation of wakefields by an relativistic electron bunch in a capillary tube filled with plasma is investigated. In the approximation of constant velocity of the bunches an analytical expressions for a components of an electromagnetic field are found. Numerical calculations of excited capillary tubes fields fabricated from the alumina and the quartz is carried out. Outer diameter of a capillary tube is equal 1 mm, inner diameter is 0.4 mm. In the absence of plasma in such structure the wakefields of the THz frequencies range are excited. Longitudinal and transverse profiles of wake fields in slow wave structure which drive channel is filled with plasma are investigated in details. These profiles allow to investigate dependences of wakefields from plasma density, the sizes of dielectric structure and/or the linear sizes of an electron bunch. When comparison of these dependences, it follows that there are longitudinal positions of the test bunch relative to the drive bunch, which can provide high-gradient acceleration of charged particles and their simultaneous radial focusing.  
 
MOPPA002 Nonlinear Theory of Excitation of an Axially Asymmetric Wakefield in Dielectric Resonator wakefield, electron, electromagnetic-fields, acceleration 245
 
  • K.V. Galaydych, G.V. Sotnikov
    NSC/KIPT, Kharkov, Ukraine
  
  A nonlinear self-consistent theory of excitation of an axially asymmetric wakefield by relativistic electron bunches in cylindrical dielectric resonator with a vacuum channel for the charged particles transportation through the resonator is constructed. An excited fields are presented in the form of superposition solenoidal and potential fields. The solenoidal electromagnetic fields are presented by an expansion of the required fields into solenoidal fields of the empty dielectric resonator. The potential field is presented by the eigenfunction expansion method. The dispersion equation for determination of eigenfrequencies and the equation for eigenvalues are obtained, eigenwaves, eigenfunctions and their norms are found. For an excited fields the analytical expressions, that take into account both longitudinal and transverse dynamics of bunch particles are derived. Along with the equations of motion they provide a self-consistent description of the dynamics of generated fields and bunches. The formulated nonlinear theory allows investigating numerically the nonlinear effects such as increasing of the transverse bunch size, and head-tail beam breakup instability, which occurs if the electron bunch in the structure is misaligned.  
 
MOPPA003 A Coaxial Two-Channel Dielectric Wakefield Structure for Two-Beam Acceleration Experiments at SLAC wakefield, radiation, simulation, 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. 		 
 
MOPPA008 Parameter Optimization of a Rectangular Dielectric Based Wakefield Accelerating Structure wakefield, electron, accelerating-gradient, radiation 260
 
  • S. Baturin, A. Altmark, I.L. Sheynman
    LETI, Saint-Petersburg, Russia
  • A. Kanareykin
    Euclid TechLabs, LLC, Solon, Ohio, USA
  
  With this talk, we present the algorithm and simulation results of the wakefield parametric study of the rectangular dielectric based wakefield accelerating structure. Analytical solution of the wakefield generation in the rectangular dielectric structure has been considered to achieve optimal relations between both the geometrical parameters and dielectric constant of the structure, and the beam parameters like bunch charge and bunch length. Optimization has been carried out for maximization of the accelerating gradient at the single LSM11 mode approximation.  
 
MOPPA016 Dynamics of 197Au78+ Ions Generated in Recombination with Cooling Electrons in the NICA Collider ion, synchrotron, collider, electron 275
 
  • A.V. Eliseev
    JINR, Dubna, Moscow Region, Russia
  • O.S. Kozlov, A.B. Kuznetsov, A.V. Philippov, A.O. Sidorin, A. Tuzikov
    JINR/VBLHEP, Dubna, Moscow region, Russia
  • I.N. Meshkov
    JINR/DLNP, Dubna, Moscow region, Russia
  
  Ions 197Au78+ are generated in recombination of original bare nuclei 197Au79+ with cooling electrons in the electron cooler of the NICA Collider. The ions 197Au78+ dynamics is considered in the in energy range 1–4.5 GeV/u when ion beam is bunched with RF voltage (collision mode operation of the NICA Collider). It is shown that some part of 197Au78+ ions can be involved in synchrotron motion when other part suffers a chaotic motion regime. Most of these ions live in vacuum chamber until further recombination in to the state of 197Au77+ and leave the Collider acceptance very fast. The evolution in time of ion distribution over the Collider aperture is presented.  
 
MOPPA022 Status of INR DTL RF System cavity, DTL, linac, cathode 293
 
  • A.I. Kvasha, A. Feschenko, V.L. Serov
    RAS/INR, Moscow, Russia
  
  INR Linac is in regular operation since 1993. The accelerator incorporates DTL and DAW structures operating at 198.2 MHz and 991 MHz correspondingly. Initially two types of high power vacuum tubes specially designed for INR linac (GI-54A for final amplifier and GI-51A for intermediate amplifier) were used in DTL RF power system. However production of these tubes has been terminated resulting in a need of DTL RF system upgrade. The main goal of the recent upgrade is replacement of the old tubes by modern ones. The difficulty of replacement arises due to a need to minimize mechanical changes of the existing equipment. Another goal is improving of operational reliability. The reliability depends on vacuum tube reliability and to a large extent - on crowbar operation. The results and the experience of INR DTL RF system upgrade are presented  
 
MOPPA030 X-ray Radiation High-Voltage Elements of the Tandem Accelerator With Vacuum Insulation radiation, electron, high-voltage, neutron 299
 
  • I.N. Sorokin, A.G. Bashkirtsev, V.Ya. Chudaev, A.A. Ivanov, D.A. Kasatov, A.S. Kuznetsov, S.Yu. Taskaev
    BINP SB RAS, Novosibirsk, Russia
  
  In Institute of Nuclear Physics SB RAS the epithermal neutron source is entered into operation based on the tandem – accelerator with vacuum isolation. It was evaluated the accelerating installation components of a X-ray field causing dark current and breakdowns in accelerating gaps. The estimated account of equivalent doze capacity on different distances from the accelerator in the protected hall and behind its limits is made. The experimental measurements were carried out and the study results of the doze capacity dynamics are submitted, depending on change of a dark current in tandem accelerating gaps at a complete working voltage 1 MV without a beam. The spectrum of X-ray radiation is experimentally measured. It is experimentally revealed and the occurrence of powerful X-ray radiation is investigated at substantial growth of the aperture of the accelerating channel. Are offered and the changes of a design of installation for prevention of occurrence of powerful X-ray radiation are realized. The carried out research allows setting necessary parameters for designing medical installation on the basis of an accelerator - tandem with vacuum isolation with the purpose of realization in oncological clinics neutron-capture therapy of malignant tumours.  
 
TUPPB002 Effect of Gold Nuclei Recombination in Electron Cooling System on Beam Lifetime in the NICA Collider ion, electron, collider, luminosity 307
 
  • A.V. Philippov, O.S. Kozlov, A.B. Kuznetsov, A. Tuzikov
    JINR/VBLHEP, Dubna, Moscow region, Russia
  • I.N. Meshkov
    JINR/DLNP, Dubna, Moscow region, Russia
  
  On the basis of experimental data the production of the ions Au78+ and Au77+ as a result of step-by-step radiative recombination of bare nuclei on free electrons in the NICA Collider electron cooling system is presented. The influence of Au78+ ions on the luminosity lifetime is discussed. The optimum working cycle of the NICA Collider is described.  
 
TUPPB029 Transverse Dynamics of a Ring Beam in a Coaxial Two-Channel Dielectric Waveguide wakefield, simulation, 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.  
 
TUPPB039 The Motion of Ionic Flux in an Electron Layer electron, ion, plasma, extraction 403
 
  • A.S. Chikhachev, Y.A. Kovalenko
    Allrussian Electrotechnical Institute, Moskow, Russia
  
  Processes of ion extraction from plasma are very important for experiment. This process is studied in a lot of theoretical works. In work * was shown that ions leave plasma with velocities, exceeding ion-sound velocity. In real conditions when electron temperature exceeds the ion temperature, quantity ions accelerated is exponentially small. In work ** was shown that transition layer in system "plasma-vacuum" are infinitely great. In *** equilibrium states with nonzero flow of electrons are studied, where electrons and ions have the same drift direction. In presented work equilibrium states are studied when nonzero electron flow has drift direction perpendicular to ion drift direction. States were examined with finite thickness and in condition of electrons, occupying half of the layer.
* K.-U.Riemann, J.Phys. D, 1991, 24, 493.
** N.Sternberg, V.Godyak, IEEE Plasma Sc., 35, 2007, 1341.
*** Yu.A.Kovalenko, T.V.Chernyshev, A.S.Chikhachev, Izv. RAN, "Energetika", 2011, 4, 24.
 		 
 
TUPPB043 Program Complex for Vacuum Nanoelectronics Finite Element Simulations electron, simulation, cathode, 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.  
 
TUPPB044 The Knife-Edged Field Emitter Mathematical Modeling cathode, space-charge, controls, background 412
 
  • E.M. Vinogradova, M.G. Fomenko
    Saint-Petersburg State University, Saint-Petersburg, Russia
  
  Numerous nano-scale electronic devices are based on the field emitters such as carbon nanotubes. The field emitters are extensively applied in the various domains of an instrument engineering. In the present work the problem of a field emission cathode as the knife-edged field emitter mathematical modeling is solved. The supposed shapes of the emission diode system with the field emitter are the lune's type (as a cathode) and the infinitely thin spherical segment (as an anode). The effect of the space charge is neglected. The boundary - value problem for the Laplace equation in the toroidal coordinate system is presented. To solve the electrostatic problem the variable separation method is used. The potential distribution is represented as the series with respect to Legendre functions. The boundary conditions and the normal derivative continuity conditions lead to the linear algebraic equations system relative to the series coefficients. In this way the distribution of the potentials for the whole region of the considered electro-optical systems was obtained.  
 
TUPPB045 The Field Cathodes with the Effect of Space Charge Modeling space-charge, electron, cathode, brightness 415
 
  • M.A. Makarova, E.M. Vinogradova
    Saint-Petersburg State University, Saint-Petersburg, Russia
  
  This work is devoted to the question of the effect of space charge on the field electron emission. The electrostatic potential distributions for the diode emission systems are calculated. The diode systems, which can be readily constructed, is generally used for the characterization of field emission properties of novel materials. They have some effective applications in vacuum nano- and microelectronics. In this work the plane diode emission system and cylindrical diode emission system are investigated. The solutions of Poisson's equation for the electrostatic potential distribution are received for the boundary-value problems. The right side of Poisson's equation is assumed to be the piecewise constant function. The charge conservation law and the energy conservation law are used. One and two dimensional cases are investigated.  
 
TUPPB047 The Triode-type System on the Basis of the Field Emitter Modeling cathode, electron, controls, ion-source 418
 
  • D.S. Televnyi
    St. Petersburg State University, St. Petersburg, Russia
  • E.M. Vinogradova
    Saint-Petersburg State University, Saint-Petersburg, Russia
  
  The mathematical model of a cylindrical triode-type system on the basis of the field emitter is under consideration. The internal area of the system is filled of two different dielectrics. Effect of space charge is not considered. The field emitter is modeled by a charged filament of finite length, which located on the system's axis. The modulator has a form of a circular diaphragm. The Poisson equation with the given values of potentials at the electrodes is solved. The variable separation method is used to determine distribution of electrostatic potential. An unknown function of the charge density is approximated by a piecewise constant linear function. The problem of finding unknown coefficients in the potential eigenfunction expansion is reduced to the linear algebraic equations system. Numerical calculations emitter's forms are represented.  
 
TUPPB048 The Multi-Tip Field Emission Cathode Mathematical Modeling cathode, lattice, electron, space-charge 421
 
  • N.V. Egorov, E.M. Vinogradova
    Saint-Petersburg State University, Saint-Petersburg, Russia
  
  The multi-tip field cathode as the field emission cathode arrays for rectangular lattice is considered. The field emission cathodes are of interest for vacuum nano-scale electronic devices. The electrostatic potential distribution is presented for the periodic system of free-number thin tips on a plane substrate as a field emission cathode and a plane substrate as an anode. The tips shape may be various. The potential of the substrate and cathode is equal the zero, the anode's potential is equal a constant. The effect of space charge is neglected. The each tip is represented as a system of the point charges. The point charges are determined to the zero equipotential coincides with the cathode's shape. The potential distribution is found for whole region of the field emission cathode arrays. The exact three-dimensional solution to the Laplace/Poisson equation has been obtained in the Cartesian coordinate system. This solution has direct applications in three-dimensional calculations of electron trajectories in micron- and submicron-sized field-emitter arrays.  
 
TUPPB049 First Test Results of RF Gun for the Race-track Microtron Recuperator of BINP SB RAS cavity, electron, gun, microtron 424
 
  • V. Volkov, V.S. Arbuzov, E.I. Gorniker, E.I. Kolobanov, S.A. Krutikhin, I.V. Kuptsov, G.Y. Kurkin, V.N. Osipov, V.M. Petrov, A.M. Pilan, M.A. Scheglov, I.K. Sedlyarov, N. Vinokurov
    BINP SB RAS, Novosibirsk, Russia
  
  A new electron source for the Race-Track Microtron Recuperator is being developed by BINP SB RAS. It will increase average beam current and brightness of synchrotron radiation. Instead of the static 300kV electron gun operated now we are developing RF gun with the same energy of electrons. This RF gun consists of RF cavity with a gridded thermo cathode mounted on the back wall. RF cavity is driven by a 60 kW generator with last stage equipped by GU101A tetrode tube. Operational frequency of the cavity is 90.2 MHz. It is equal to the second subharmonic of the Microtron RF system frequency. A set of low power electronics controls amplitude of the cavity voltage and its tuner. This system, including a diagnostics beam line, has been installed to serve as a test bench to test the RF cavity and for beam dynamics studies. In continuous regime the designed 300 kV voltages at the acceleration gap is obtained. This paper summarizes the first test results of the cavity in this configuration.  
 
WEPPC003 Beam Pulse Separation System of INR Linac extraction, linac, target, cavity 451
 
  • V.L. Serov, N.I. Brusova, A. Feschenko, O.V. Grekhov, Y.Z. Kalinin, V.N. Mikhailov, A.A. Stepanov
    RAS/INR, Moscow, Russia
  • B.O. Bolshakov, A.V. Pozhensky
    NIIEFA, St. Petersburg, Russia
  
  The activity for beam intensity increasing and beam use efficiency improvement is under progress in INR linac. An important stage is the development and implementation of the Beam Pulse Separation System in the accelerator intermediate extraction area (160 MeV). The system is intended for distribution the beam pulses between Isotope Production Facility (up to 160 MeV) and the Experimental Facility located downstream of the accelerator exit. The report describes the upgrade of intermediate extraction area as well as the first results of experiments with the beam.  
 
WEPPC014 Performance of the Magnetic System of a 12 MeV UPC Race-Track Microtron simulation, factory, dipole, microtron 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.  
 
WEPPC016 Update of Classical Cyclotron U-150 Magnetic System. Simulation and Experiment cyclotron, simulation, 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, simulation 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.  
 
WEPPC035 System of Vacuum Monitoring of Synchrotron Radiation Source of National Research Center Kurchatov Institute controls, synchrotron, high-voltage, radiation 518
 
  • N.I. Moseiko, V. Korchuganov, D.G. Odintsov
    NRC, Moscow, Russia
  • Y.V. Krylov, L.A. Moseiko, A.V. Shirokov
    RRC, Moscow, Russia
  • B.I. Semenov
    RRC KI, Moscow, Russia
  
  The source of synchrotron radiation of National Research Center Kurchatov Institute (KCSR) consists of the main ring on energy of electrons of 2.5 GeV, the booster ring on the maximum energy of 450 MeV and 80 MeV linac. The project of upgrade of KCSR vacuum system, including transition to new power supplies for sputter ion pumps is developed and is implemented. The vacuum system provides vacuum of 0.1 mkPa. The new vacuum system is developed on the basis of the modern high-voltage power supply of the VIP-27 type controlled by the interface units of the BUP-27 type, is placed in standard crate 3U Euromechanics. VIP-27 is controlled the four pumps of PVIG 250/600 type. The vacuum system is controlled from the Pentium computer on the CAN bus. Now the upgraded system serves about 100 vacuum pumps. Power supply unit provides voltage up to 7 kV. The vacuum monitoring is provided by measurements of the current of the power supply unit in the range of 0.0001-10 mA. The status display and the data archive based on MS SQL Server.  
 
WEPPC044 Positron Annihilation Spectroscopy at LEPTA Facility positron, electron, background, lattice 532
 
  • P. Horodek, I.N. Meshkov
    JINR/DLNP, Dubna, Moscow region, Russia
  • A.G. Kobets, V.I. Lokhmatov, V. Pavlov, A.Yu. Rudakov, A.A. Sidorin, S. Yakovenko
    JINR, Dubna, Moscow Region, Russia
  
  The Low Energy Positron Toroidal Accumulator (LEPTA) at JINR proposed for generation of positronium in flight can be used for positron annihilation spectroscopy (PAS). The positron injector of the LEPTA facility can generate continuous slow positron beam of the intensity up to 1*107 s−1 at the energy in the range of a few eV to 100 keV and width of the spectrum 1-2 eV. The injector is based on radioactive 22Na isotope. The solid neon is used as moderator to generate monochromatic positron beam. It is known that positrons implanted into the matter can localize the defects of structure as vacancies, clusters of vacancies and pores. Observation of gamma quanta (511 keV) from annihilation process allows to obtain the information about the presence, concentration and kind of defects. Nowadays, the experiments with the use of slow positrons beam instead of standard isotopic sources are more popular. The progress in the creation of Doppler broadening of annihilation gamma line spectrometer will be presented here. In the simplest version, it is a set composed of a HpGe detector, a preampliefier, an ampliefier, a MC analyzer and a PC computer. This combination makes possible the observation of changes in 511 keV gamma line, calculation characteristics for PAS parameters and in effect to deduce about defects concentration and their chemical surrounding.  
 
WEPPC046 RF Photoinjector Parameters Optimization coupling, impedance, electron, radiation 535
 
  • T.V. Bondarenko, S.M. Polozov
    MEPhI, Moscow, Russia
  
  Sources of high-power electromagnetic radiation in THz band are becoming promising as a new method of a low activation introscopy. Research and development of accelerating RF photoinjector for THz source are reported. The photoinjector is based on disk loaded waveguide (DLW). Photoinjector consists of two accelerating structures: widespread 1.6 cell DLW structure and travelling wave resonator structure based on 8 cells traveling wave accelerating structure. The resonant models of these structures and the structures with power ports were designed. Electrodynamics characteristics and electric field distribution for all models were acquired. Electrodynamics models were tuned to the resonant frequency of 3000 MHz. Magnetic field coupling between cells of accelerating structure and optimization of the diaphragms sizes were analyzed to enlarge the structures efficiency. Diaphragms windows profiles were optimized to decrease the overvoltage on the windows edges and to eliminate the breakdown possibility.  
 
WEPPC048 Status of 1 MeV 25 kW CW Electron Accelerator electron, klystron, gun, high-voltage 541
 
  • D.S. Yurov
    MSU SINP, Moscow, Russia
  • A.S. Alimov, B.S. Ishkanov, N.I. Pakhomov, V.P. Sakharov, V.I. Shvedunov
    MSU, Moscow, Russia
  
  Status of 1 MeV 25 kW continuous wave (CW) linear electron accelerator for radiation technologies which is under construction at SINP MSU is described. Driven by 50 kW CW klystron on-axis coupled standing wave accelerating structure was optimized, manufactured and tuned. The results of accelerating structure measurements and tuning are presented. RF system, high voltage, vacuum and control systems of the accelerator are described. New magnetic system forming output beam irradiation field is also described.  
 
WEPPC052 Beam Scanning System of Linear Accelerator for Radiation Processing extraction, electron, controls, beam-losses 547
 
  • M.I. Demsky, V.V. Krotov, D.E. Trifonov
    CORAD Ltd., St. Petersburg, Russia
  
  The report represents a beam scanning system for irradiation of opposite sides of the boxes during one pass. This beam scanning system contains the well-known scanning system composed of scanning magnet and vacuum chamber with the beam extraction window covered by titanium foil. The bending magnet, which is located on the edge of this vacuum chamber, turns the electron beam to the metallic pipe, connected with the vacuum chamber. The metallic pipe goes sideways from the irradiated boxes and is connected with the second vacuum chamber, located inside of a 180 degrees bending magnet. Electrons are turning on 180 degrees and scanning along the opposite side of the boxes due to the hyperbolic shape of the current in a coil of the 180 degrees bending magnet. Therefore, electrons are scanning along one side of the box, then round the box sideway through the metallic pipe and scanning along the opposite side of this box after turning 180 degrees. The full cycle of the scanning can be repeated up to 6 times per second. The experimental results of this system operation with 10 MeV, 12 kW electron beam are given in this report.  
 
WEPPC057 Calibration Testing of the Stripping Target of the Vacuum Insulated Tandem Accelerator target, ion, proton, high-voltage 560
 
  • A.S. Kuznetsov, V.I. Aleynik, I.M. Shchudlo, I.N. Sorokin, S.Yu. Taskaev, M.A. Tiunov
    BINP SB RAS, Novosibirsk, Russia
  
  Funding: The work supported by the Ministry of Education and Science of the Russian Federation.
The Vacuum Insulated Tandem Accelerator was developed in the Budker Institute of Nuclear Physics to produce epithermal neutrons for boron neutron capture therapy in the 7Li(p,g)7Be reaction. The parameters of the generated radiation allow us to carry out in vitro and in vivo investigations of BNCT*. In present moment the modernization of the facility elements is carrying out to meet the parameters required for clinical usage. Presented work is aimed on modernization of the gas stripping target that is used in the Vacuum Insulated Tandem Accelerator to recharge negative hydrogen ions into protons. The target was modernized to get higher efficiency of the beam transportation and to raise the current of the accelerated proton beam. The design of the modernized stripping target, the calculated data on gas flow rate and recharge effectiveness, also the results of experimental measurement of transported current depending on the gas flow rate are presented. The method of the target thickness determination and the procedure to adjust the regime of gas flow gate to get the required recharging effect were suggested.
* V. Aleynik, A. Burdakov, V. Davydenko, et al. BINP accelerator based epithermal neutron source. Applied Radiation and Isotopes, 69 (2011) 1635-1638. 		 
 
WEPPC060 Experimental Channel for Proton Beam with Energy 9 GeV target, proton, quadrupole, scattering 566
 
  • M.M. Kats
    ITEP, Moscow, Russia
  
  It was described one of possible version of experimental channel for proton beam with energy 9 GeV for ITEP. It based on proton beam after quick extraction, on existing experimental hall and on existing quadrupoles.  
 
WEPPD023 Dubna-Minsk Activity on the Development of 1.3 GHz Superconducting Single-Cell RF-cavity cavity, niobium, electron, cryogenics 602
 
  • N.S. Azaryan, Ju. Boudagov, D.L. Demin, G. Shirkov
    JINR, Dubna, Moscow Region, Russia
  • M.A. Baturitsky
    NC PHEP BSU, Minsk, Belarus
  • S.E. Demyanov, E.Yu. Kaniukov
    Scientific-Practical Materials Research Centre of the National Academy of Sciences of Belarus, Minsk, Belarus
  • V.A. Karpovich, N.V. Liubetsky
    BSU, Minsk, Belarus
  • R.D. Kephart, L. Ristori
    Fermilab, Batavia, USA
  • S.V. Kolosov, A.A. Kurayev, A.K. Sinitsyn
    Belarus State University of Informatics and Radioelectronics (BSUIR), Minsk, Belarus
  • S.I. Maximov, V.N. Rodionova
    Belarussian State University, Scientific Research Institute of Nuclear Problems, Minsk, Belarus
  • V.S. Petrakovsky, I.L. Pobol, A.I. Pokrovsky, S.V. Yurevich, A.Yu. Zhuravsky
    Physical-Technical Institute of the National Academy of Sciences of Belarus, Minsk, Belarus
  
  In 2011 Dubna-Minsk collaboration started an activity on the development and manufacture the series of superconducting niobium cavities in the enterprises in Belarus. First results of this work are presented. Simulation code was developed to compute EM characteristics, and to calculate the shape and geometric dimensions of SC niobium RF-cavity taking into account higher order oscillations modes. The calculations of a single-cell and 9-cell cavity were made: the found ratio of the maximum electric field on the cavity axis to an average accelerating field is 2 within 1%; the found geometric factor equals 283 Ohm. Half-cells will be made by hydraulic deep drawing and welded by electron-beam (EBW). A stamping tool for hydraulic deep drawing of the half-cells and a set of technological tools for probing of EBW of two half-cells have been designed. Mechanical properties of niobium and model material (Cu, Al) were investigated. Cryogenic system for low temperature RF tests of the SC single-cell cavity was successfully tested at 4.2 K. Coupling device for RF measurement of the single-cell SC niobium cavity was synthesized and manufactured – the measured standing wave ratio is about 1.01-1.07. Warm RF tests with etalon single-cell cavity were made: fundamental frequency – 1.273 GHz, quality factor (warm) – 28·103.  
 
WEPPD032 Multimode Digital Integrators For Precise Magnetic Measurements induction, booster, controls, synchrotron 617
 
  • A.V. Pavlenko, A.M. Batrakov, D. Shichkov
    BINP SB RAS, Novosibirsk, Russia
  • P.V. Vagin
    DESY, Hamburg, Germany
  
  The induction method of magnetic measurement is the most important, widely used and oldest measurement method for particle accelerator magnets. Nevertheless, both the new demands of the accelerator techniques and possibilities of modern electronics stimulate the creation of more accurate and fast instrumentation, based on the induction method. This report describes the multimode integrators intended for magnetic measurements with the relative accuracy better than 10-4 and even better than 10-5 in special cases. Integrators provide high accuracy level both for the constant magnetic field measurements using movable coils and for the pulse measurements also. Modern digital techniques are used to get the partial integral of signal in the strongly determined time interval. The paper considers theoretical issues of the digital integration technique and related error sources. The structure of digital integrator is presented, and key features are listed. In conclusion a brief description of two magnetic measurement systems is given. The first system is used to measure the magnetic field transverse distribution in pulse elements, and the second one – to measure the harmonics in magnetic lenses with constant field.  
 
WEPPD038 Optimization of the Negative Hydrogen Ion Beam Injection into the Tandem Accelerator with Vacuum Insulation ion, focusing, proton, tandem-accelerator 623
 
  • A.N. Makarov, V.I. Aleynik, A.G. Bashkirtsev, A.S. Kuznetsov, I.M. Schudlo, I.N. Sorokin, S.Yu. Taskaev, M.A. Tiunov
    BINP SB RAS, Novosibirsk, Russia
  
  The beam of negative hydrogen ions is injected into the tandem accelerator with vacuum insulation in order to obtain high-current proton beam. To accurately direct the beam into the accelerator the magnetic focusing lenses are used. In this paper it is described the design of the special beam detector mounted in front of the first accelerating electrode and intended to measure beam profile and the current density. The results of measurements of the dependence of the current density on the power of the magnetic focusing lenses are shown. The parameters of the beam resulting in the best agreement of calculation and experiment are specified. The optimum focusing mode to inject the negative hydrogen ions into the accelerator is determined.  
 
WEPPD042 Vacuum Automatic Control System (ACS) for NICA Project controls, ion, monitoring, heavy-ion 635
 
  • R.V. Pivin, A.R. Galimov, H.G. Khodzhibagiyan, A.V. Smirnov
    JINR, Dubna, Moscow Region, Russia
  • A.M. Bazanov, A.V. Butenko, A. Nesterov, G.V. Trubnikov
    JINR/VBLHEP, Dubna, Moscow region, Russia
  • P. Hedbavny
    Pfeiffer Vacuum GmbH, Asslar, Germany
  
  Development of the automatic control vacuum system (ACVS) for NICA project was beginning. The first step of this work was Nuclotron vacuum system modernization. It were installed new vacuum pumps and gauges with RS-232, RS-485 and ProfiBus interfaces. Devices were combined to the net with central controller at Linac control room. The result of the modernization was creation of remote control, monitoring and automatic protective system. Next step of ACVS creation will be Linac vacuum system automatization. Experience of the Nuclotron vacuum system modernization will be applied for NICA ACVS development.  
 
WEPPD050 Approximate Method for Calculation of Field of Charged Particle Moving through Dielectric Object radiation, diagnostics, simulation, 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.  
 
WEPPD052 Modernization of the Automated Control System in the Kurchatov Synchrotron Radiation Source controls, synchrotron, synchrotron-radiation, radiation 659
 
  • E.V. Kaportsev, V. Dombrovsky, Y.V. Efimov, V. Korchuganov, Y.V. Krylov, K. Moseev, N.I. Moseiko, A.G. Valentinov, Y.L. Yupinov
    NRC, Moscow, Russia
  
  The running cycle of Kurchatov Synchrotron Radiation Source (KSRS) includes the injection of electrons with energy 80 MeV from the linear accelerator in the booster storage ring Siberia-1, the accumulation of a electron current up to 300 mA and, then, electron energy ramping up to 450 MeV with the subsequent extraction of electrons in the main ring, storage ring Siberia-2, and accumulation there up to 200 mA, and at last the energy ramping up to 2.5 GeV. The current automated control system (ACS) of the accelerating-storage complex (ASC) "SIBERIA" was established more than 20 years ago on the basis of the control equipment in the CAMAC standard. It is physically and morally outdated and does not meet modern requirements for speed, accuracy and speed of data transmission. This paper presents some options for replacing the old control system ESC to more modern components, using high-speed processor modules VME, and high-speed industrial network CAN.  
 
WEPPD060 Distributed Control System for an Industrial Electron Beam Accelerator controls, electron, high-voltage, gun 680
 
  • V. Sharma
    BARC-EBC, Mumbai, India
  
  Funding: Bhabha Atomic Research Center, Trombay, Mumbai
A 3MeV DC Electron beam accelerator has been developed at Electron Beam Center, BARC, Mumbai, India. PLC based distributed control system has been incorporated for the control of the accelerator. A touch screen user interface (HMI) based control system provides a single point control of the whole accelerator. The accelerator operation data is stored in the memory Flash card of the HMI. The Accelerator has many subsystems such as scan magnet supply to scan the electron beam, Chiller unit to supply chilled water to the accelerator for cooling,vacuum system to maintain the vacuum inside the beam line,high voltage unit to generate the EHV for electron acceleration and other support system. All the above subsystems have to be controlled from the central location in order to operate the accelerator safely. Each of the subsystem has been controlled by a PLC controller independently and their control and safety is ensured by the program logic algorithm. After each of the subsystem has been tested separately all the PLCs are connected to the central PLC on modbus RS232 and modbus TCP-IP. The main central PLC has been programmed to fetch the data from individual subsystems PLCs and provide control and monitoring of the accelerator. In auto mode of operation setting the accelerator parameters operates all the subsystems automatically.