RuPAC-2010 - List of Keywords (simulation)

A B C D E F G H I K L M O P Q R S T U V W

simulation

Paper	Title	Other Keywords	Page
TUPSA005	A 12 GHz Pulse Compressor and Components for CLIC Test Stand	coupling, vacuum, controls, recirculation	44
	S. V. Kuzikov, A. A. Bogdashov, G. G. Denisov IAP/RAS, Nizhny Novgorod K. M. Schirm, I. Syratchev CERN, Geneva A. A. Vikharev Omega-P, Inc., New Haven, Connecticut
	The X-band power test stand needed for preprocessing and testing of key CLIC RF components is being installed in the test facility CTF3. The test stand includes several 12 GHz XL5 klystrons (50 MW, 1.5 mks) and a pulse compressor of the SLED-I type to obtain over 120 MW peak power at 230 ns pulse length. A compact compressor of this type based on TE01-TE02 beating wave in high Q-factor compressor’s cavities has been designed, produced, and tested at low power level. For testing accelerating structures and so-called "CLIC recirculation principle" of its operation several -3 dB couplers and variable power attenuators were also produced and tested.

TUPSA022	Simulation of Au³²⁺ Beam Losses Due to Charge Exchange and Dynamic Vacuum in Nuclotron Booster	booster, ion, vacuum, beam-losses	89
	A. O. Sidorin, A. Kuznetsov, V. A. Mikhaylov, G. V. Trubnikov JINR, Dubna, Moscow Region A. V. Philippov JINR/VBLHEP, Dubna, Moscow region P. Puppel, P. J. Spiller GSI, Darmstadt
	The StrahlSim code was used to simulate the beam loss and the dynamic vacuum for the proposed Nuclotron booster. The Nuclotron booster will accelerate Au³²⁺ ions from 6.2 MeV/u to 600 MeV/u. The simulations have been carried out considering systematic injection (0% to 10%) and RF-capture losses (5% to 15%). Furthermore the influence of an ion catcher system on the beam loss has been investigated, in order to estimate, if such a system could stabilize the beam loss. Without an ion catcher system, zero systematic losses, and a static pressure of , the transmission was calculated to be 83%. The presence of an ion catcher system would stabilize the transmission at a considerably higher level than without such a system for all scenarios.

TUPSA026	RTS&T Code Status	radiation, target, resonance, ion	92
	I. I. Degtyarev, O. A. Liashenko, F. N. Novoskoltsev, I. A. Yazynin IHEP Protvino, Protvino, Moscow Region A. I. Blokhin Institute of Physics and Power Engineering (IPPE), Obninsk
	The paper describes the main features of the RTS&T–2010 — the modern version of the RTS&T (Radiation Transport Simulation and Isotopes Transmutation problem) code system. RTS&T performs detailed Monte Carlo simulations of many type of particles transport in complex spatial geometries with composite materials in the energy range from thermal energy up to 100 TeV. The RTS&T code considers interaction of low-, intermediate-, and high- energy particles with condensed matter, including hadron-nucleus interactions inside the target, generation and transportation of secondary particles, deposition of energy and production of radionuclides in the target. Recently, the transfer of ions was added and tested.

TUPSA034	Distortions of Proton Beam 2-D Images and Profiles due to Beam Space Charge	ion, proton, space-charge, linac	116
	P. I. Reinhardt-Nickoulin, A. Feschenko, S. A. Gavrilov, I. V. Vasilyev RAS/INR, Moscow
	The special residual gas ion transverse section monitor is used at Proton LINAC INR RAS output to provide measurements of beam parameters. There are distortions and errors of measurements which are caused by various external and internal factors during the formation of beam transverse section images. Below estimations of these distortions and results of numerical simulation of registration process of images are resulted, resolution of the detector and accuracy of measurements which are spent with it are discussed.

WEPSB001	Research of Photon Emission of 120 GeV Channeling Positrons	positron, radiation, multipole, photon	172
	V. A. Maisheev, Y. A. Chesnokov, P. N. Chirkov, I. A. Yazynin IHEP Protvino, Protvino, Moscow Region D. Bolognini, S. Hasan, M. Prest Università dell'Insubria & INFN Milano Bicocca, Como E. Vallazza INFN-Trieste, Trieste
	The process of radiation of 120-GeV positrons moving in a channeling regime in (011) and (111) plane of a single crystal was considered. At the beginning on the basis of the theory of nonlinear oscillations the trajectory of moving positrons at different initial conditions were derived. Then taking into account the nonlinearity of motion the distribution function over oscillation amplitudes of channeling particles was found. After this the intensity of radiation in thin crystal at different initial conditions was calculated with the help of two various methods. The received results have formed a basis for calculation of positron energy losses in not thin crystals taking into account the processes of dechanneling and multiplicity of generation of photons. Research was executed within the frame of experiment INSURAD ( the beam line 4Н, SPS, CERN). The calculations are in the good consent with preliminary results of this experiment. The received results can be used for creation of powerful sources of radiation and for collimation of positron beams in linear colliders.

WEPSB017	Space Charge Simulation Using MADX with Account of Synchrotron Oscillations	lattice, emittance, space-charge, extraction	204
	V. V. Kapin MEPhI, Moscow Y. Alexahin Fermilab, Batavia
	Direct space charge forces can be simulated with the 6D beam dynamics code MADX using a number of 4D BEAMBEAM elements with Gaussian transverse profile for charge density. To take into account effects of synchrotron oscillations on space charge forces, the amplitude of BEAMBEAM elements is modulated according to the distance between a particle and the bunch center assuming Gaussian longitudinal profile. Parameters of every BEAMBEAM element (charge and sizes) are defined by local values of beta-function and dispersion, while they are updated according to the beam intensity and beam emittances at every turn. MADX script accomplishing this method has been written for the lattice of the existing Debuncher ring. The slow extraction at the 3rd order resonance with simultaneously varying the horizontal tune and the sextupole strength is considered as one of the options for Debuncher to be used in the "mu2e" project. Our MADX simulation results are compared with results obtained by V. Nagaslaev (FNAL) using the particle-in-cell ORBIT-code. The evolutions of the phase-spaces and the beam intensity within ten thousands turns have shown a good agreement between the MADX and ORBIT results.

WEPSB018	Transverse Bunch Dynamics in Rectangular Dielectric Loaded Wakefield Accelerator	vacuum, electron, focusing, controls	207
	A. Altmark, I. L. Sheynman LETI, Saint-Petersburg A. Kanareykin Euclid TechLabs, LLC, Solon, Ohio
	Funding: Ministry of Education and Science of Russia, “Scientific and scientific-pedagogical personnel of innovative Russia” and the Russian Foundation for Basic Research (09-02-00921) Beam breakup (BBU) effects resulting from parasitic wakefields provide a potentially serious limitation to the performance of dielectric structure based accelerators. We report here on comprehensive numerical studies of transverse bunch dynamics in a rectangular dielectric loaded accelerating structure. The numerical part of this research is based on a particle-Green’s function beam dynamics code (BBU-3000) that we are developing. The code allows rapid, efficient simulation of beam breakup effects in advanced linear accelerators. It is shown that the LSE modes make its main contribution to the transverse deflecting force causing beam breakup in rectangular DLA structures. Results of test simulations are presented.

WEPSB025	Center Region Design of the Superconducting Cyclotron C400	cyclotron, ion, injection, focusing	221
	G. A. Karamysheva, N. A. Morozov, E. Samsonov JINR, Dubna, Moscow Region M. Abs, Y. Jongen, W. J.G. M. Kleeven, S. Zaremba IBA, Louvain-la-Neuve O. Karamyshev JINR/DLNP, Dubna, Moscow region
	Compact superconducting isochronous cyclotron C400 has been designed at IBA (Belgium) in collaboration with the JINR (Dubna). This cyclotron will be used for radiotherapy with proton, helium or carbon ions. The ions extracted from the source and transported with the axial line are bent into the median plane of the cyclotron by a spiral inflector. The optimal design of the inflector and cyclotron center for acceleration of the ion beams in the 4th RF harmonic mode was investigated. A computer model of the dee geometry with the inflector and inflector housing was created. The 3D magnetic field map and 3D electric field map were used for beam dynamics simulations. Comparison between field map created in electrostatic simulation and field map from RF simulation is given. Results of the beam tracking are presented.

WEPSB027	MiltP-M Code Upgrade	electron, focusing, electromagnetic-fields, controls	227
	M. Gusarova, R. O. Bolgov, I. I.V. Isaev, S. V. Kutsaev, M. V. Lalayan, N. P. Sobenin MEPhI, Moscow L. V. Kravchuk RAS/INR, Moscow
	The new possibilities of MultP-M code for calculation of the multipactoring in radio frequency elements of charged particles accelerators taking into account influence of the external electric and magnetic fields are presented. Possibilities of the new module of three-dimensional display of geometry, electromagnetic fields and electron’s trajectories are shown. Example of multipactoring calculation in a transient mode in rectangular wave guide is considered

THCHA03	A Beam Loss Scintillator System for Background Monitoring at the LHCb Experiment	injection, background, beam-losses, monitoring	286
	V. Talanov, R. Dzhelyadin IHEP Protvino, Protvino, Moscow Region F. Alessio, G. Corti, R. Jacobsson CERN, Geneva A. Bobrov, A. Bondar BINP, Novosibirsk M. H. Lieng UNIDO, Dortmund
	The LHCb experiment at the Large Hadron Collider (CERN) has developed a complete high-speed and high-sensitivity background monitor based on a pair of plastic scintillators and a custom-made LHCb readout board to record fast LHC beam losses with time information. The system is installed close to the LHCb Vertex Locator and it has been operational since the LHC pilot run providing valuable information to the LHC Operations crew during beam commissioning and to LHCb Control Room about the experimental conditions at the physics runs. The system is able to record fast beam losses at a rate of 40 MHz, providing information regarding the bunch crossing of the loss, the intensity of the loss calibrated in number of Minimum Ionizing Particles. A full control and monitoring system has been developed as well within the framework of the LHCb Experimental Control System. A complete simulation of the system has been central in converting the response of the system into physical quantities. In this paper we will describe the system in its components and functionalities, the commissioning phase, the simulation framework and the first results with real beam at the LHC.
	Slides

THPSC001	Magnetic Coupled Disk-Loaded Waveguide	impedance, coupling, electron, insertion	319
	N. P. Sobenin, R. O. Bolgov, D. S. Kamenshikov, S. V. Kutsaev, A. Yu. Smirnov, S. E. Toporkov MEPhI, Moscow
	Funding: Research is supported by Russian President grant MK-3835.2009.2 Electrodynamic simulations results of disk loaded waweguide with magnetic field coupled cells are presentred. Different types of accelerating strructures having positive or negative dispersion were considered. Main electrodynamic parameters - shunt impedance, quality factor, group velocity etc. dependances on operation mode and aperture size are presented and discussed. High order modes issues were studied. These structures are proposed for advanced electron linear accelerators designed using conventional or hybrid schemes. Input coupler matching to this structure is studied.

THPSC004	Input Couplers for the Dipole Mode Periodic Structures	coupling, dipole, resonance, emittance	328
	M. V. Lalayan, A. Anisimov, S. V. Kutsaev, A. Yu. Smirnov, N. P. Sobenin MEPhI, Moscow V. V. Paramonov RAS/INR, Moscow A. A. Zavadtsev, D. A. Zavadtsev Nano, Moscow
	Funding: Research is supported by Federal Education agency grant P1141 27.08.2009 and by FCP "Scientific and scientific-educational stuff of innovative Russia" grant. Three variants of the input coupler for the periodic deflecting structure operating at hybrid dipole TM11 mode, with the phase velocity equal to the light velocity are considered: non-symmetric design and two symmetric designs with auxiliary rectangular waveguide and shorting plates in it and with auxiliary cut-off rectangular waveguide. The reflection depending on the coupling window width and on the coupling cell diameter was been investigated for all coupler designs. The reflection coefficient has been calculated in the whole dipole mode passband. The field asymmetry in the beam area has been considered. The eigen frequency of the coupling cell has been calculated.

THPSC007	Study of Electrodynamic and Thermodynamic Mechanisms Influencing Stability of Superconducting Rutherford Cable	quadrupole, synchrotron, injection, superconducting-magnet	337
	V. Zubko, I. Bogdanov, S. Kozub, P. A. Shcherbakov, L. S. Shirshov, L. Tkachenko IHEP Protvino, Protvino, Moscow Region
	Stability for superconducting fast-cycling dipoles and quadrupoles plays an important role. A feature of a complex network of strands and strand-to-strand contacts, current distribution in the network have to be taken into account for superconducting cables. The coupled numerical simulation of electromagnetic and thermal processes in Rutherford superconducting cables during the initiation of a quench was carried out. The network model has been combined with thermal analysis, which allows one to model quench dynamics, including the effects of a current redistribution in strands, discontinuities and inhomogeneity, the initial heating in strand, and, as a result, occasional quench recovery or runaway quench propagations. A computer simulation has been made for study of dependence of the minimum quench energy on ratio operating/critical currents for cables with and without core.

THPSC014	One Aspect of Thermal Stability for 4-vane RFQ Operation with High Heat Loading	rfq, linac, coupling, controls	352
	V. V. Paramonov RAS/INR, Moscow
	Due to dispersion properties, 4-vane RFQ cavity without resonant coupling is a thermally unstable structure. With deterioration of balance for local detuning, especially near cavity ends, there is a possibility for runaway in the field distribution and related thermal-stress effects. It can, in principle, finish with irreversible plastic deformations and cavity frequency shift. Both the increment and the threshold of instability are proportional to the average dissipated RF power. This possibility increases for long RFQ cavities. Also particularities for the cavity ends design are important. Some general features of this effect are discussed and illustrated with simulations.

THPSC027	Dubna Project of Cyclotron C250 for Proton Therapy Application	cyclotron, proton, extraction, ion	379
	Yu. G. Alenitsky, A. A. Glazov, G. A. Karamysheva, S. A. Kostromin, L. M. Onischenko, E. Samsonov, S. B. Vorozhtsov JINR, Dubna, Moscow Region O. Karamyshev, O. Lepkina, N. L. Zaplatin JINR/DLNP, Dubna, Moscow region
	Abstract Project of C250 – cyclotron for proton therapy is consider. Energy of the extracted from cyclotron beam was increased according to medical requirements up to 250 MeV. 4-fold and compact types of magnet yoke were studied by 3D computer magnetic field calculations. The ability of optimal combination of the magnet yoke, new form of HF systems of the cyclotron based on the dynamics of the proton beam in calculated magnetic and accelerating field is under discussion. Dubna scientific medicine center is under development since 1967 on the base of the proton beam of LNP JINR Phazotron. Proton beam with energy Ер~170 MeV and intensity I~0.1 mkA is used for patients irradiation. Proposal of the cyclotron with the same beam characteristics was reported earlier at the RUPAC04 ICAA05, RUPAC06, RUPAC08and printed in magazine. In this paper the new form of HF system, which with the help of 3d computing program made is consider.