RuPAC-2010 - List of Keywords (focusing)

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

focusing

Paper	Title	Other Keywords	Page
TUPSA009	Interbunch Energy Exchange in the Accelerating Scheme with Uniform Charge Distribution	extraction, acceleration, electron, vacuum	53
	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) The efficiency of energy transformation in multi bunch accelerating schema with uniform charge distribution is considered. The transmitted energy to accelerated bunch taking into account driving bunch exit of relativism and settling them on the walls of the waveguide is determined. It is shown that accounting losses charge of generator beam increases passed accelerated bunch energy by eliminating exhaust bunches.

WECHC01	Advance in the LEPTA Project	positron, electron, gun, vacuum	166
	A. G. Kobets, E. V. Ahmanova, M. K. Eseev, V. Karpinsky, V. I. Lokhmatov, V. N. Malakhov, I. N. Meshkov, V. Pavlov, A. Yu. Rudakov, A. A. Sidorin, S. Yakovenko JINR, Dubna, Moscow Region
	The progress since RuPAC'2008 in Low Energy Positron Toroidal Accumulator (LEPTA) project at JINR is reported. The significant development of the facility includes an increase of circulating beam life time, fabrication and commissioning of improved injection system, manufacturing of positron transfer channel, test of low energy positron injector and positron trap. First positron injection into the ring is under preparation.
	Slides

WEPSB009	Acceleration of Heavy Ions in Space Periodic Quadrupole RF Focusing Structure	rfq, acceleration, ion, quadrupole	190
	Yu. A. Budanov, O. K. Belyaev, A. Maltsev, I. A. Zvonarev IHEP Protvino, Protvino, Moscow Region
	On the basis of the structures with a longitudinal magnetic field resonators it is possible to apply a system of space periodic RF quadrupole focusing (RFQ DTL) for acceleration of heavy ions. Essential RFQ DTL feature is dependence of focusing properties of the channel on a phase of a high-frequency field. Thus, the bunches of particles after preliminary acceleration in RFQ should have small phase size. However at acceleration of heavy ions the phase size of bunch changes slowly and it remains rather big after RFQ. The developed matching device, consisting of buncher and quadrupole lenses, allows to solve the given problem and, in general, to improve the matching on all six phase variables. Numerical calculations are carried out by the example of ions of gold in RFQ DTL at working frequency of 74 MHz, input energy 0.4 MeV/n and output energy 2 MeV/n.

WEPSB014	Examination of Charged Particle Dynamics Through Employment of the Fourier Series	quadrupole, undulator, lattice, betatron	199
	O. E. Shishanin MSIU, Moscow
	In some papers we have considered an influence of the betatron oscillations on synchrotron radiation properties. To obtain uninterrupted solution for the Hill equation, in this case the transverse components of magnetic field were expanded in a Fourier series. This approach was usefully employed and posed problem was resolved in focusing periodic magnetic fields. Using this scheme, the equations of oscillations were also derived for storage rings. It was published in Proceedings of RuPAC2008. The procedure may even work for the various types of wigglers and undulators where the dynamics of particles can be described more precisely with regard to the concrete field inside a single magnet and their arrangement as a whole.

WEPSB018	Transverse Bunch Dynamics in Rectangular Dielectric Loaded Wakefield Accelerator	simulation, vacuum, electron, 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, simulation, ion, injection	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, simulation, 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

THCHA01	The Nonlinear Transformation of a Ions Beam in the Plasma Lens	plasma, ion, target, luminosity	280
	A. A. Drozdovsky, N. N. Alexeev, S. A. Drozdovsky, A. Golubev, Yu. B. Novozhilov, P. V. Sasorov, V. V. Yanenko ITEP, Moscow
	The focusing capabilities of a plasma lens depend on the stage of plasma development. Under certain conditions a magnetic field is linear, that allow to focus the beam to a very small spot. In other conditions, the magnetic field is nonlinear, that allow formation of hollow and others beam structures. The work deals with the study of the last type of a plasma lens. Calculations and measurements were performed for a C+6 and Fe+26 beams of 200 MeV/a.u.m. energy. The obtained results and analysis are reported.
	Slides

THPSC002	Feasibility of Alternating-Phase Focusing for a Chain of Short Independently-Phased Resonators	linac, ion, proton, acceleration	322
	V. V. Kapin, A. Nesterovich MEPhI, Moscow
	Alternating-phase focusing (APF) is usually realized in a long drift-tube structure with multiple acceleration gaps. The synchronous phase alternates periodically gap-by-gap according to either sinusoidal or square-wave laws. The period of synchronous phase oscillations depends on charge-to-mass ratio of accelerated ions and increases with beam energy. One period may include up to 10^-20 accelerating gaps. In the case of square-wave law, the sets of 5-10 neighboring gaps have the same synchronous phase, while whole structure consists of continuous chain such gap-sets with a constant value of synchronous phases. Therefore, every such gap-set can be formed into a separate resonator. As result a long multiple gap structure is converted into a chain of short independently-phased resonators. Such realization of APF linac allows more flexibility in a phase variation, while additional focusing-matching lenses can be set up in betweens of resonators. In this report possible parameters of such linac are evaluated and discussed.

THPSC003	Development of Wire-Meshed Electrostatic Lenses for Proton Linac	proton, linac, rfq, ion	325
	V. V. Kapin, B. Y. Bogdanovich, A. Nesterovich, V. V. Yanenko MEPhI, Moscow
	The 2-MeV 150-MHz proton RFQ linac is set up at the Radiation-Acceleration Center (RAC) of Moscow-Engineering Physics Institute (MEPhI). Its output beam-line contains doublet of the electrostatic focusing lenses with a novel design featured by the two-dimensional electric field and wire-meshed beam apertures. Every lens provides a transverse focusing effect only in one plane, while does not affect on the beam in a perpendicular plane. In this report, the analytical and numerical analysis of this lens is presented. The optics of output beam-line including these lenses is evaluated with TRACE-3D code. The experimental construction of the lens doublet is presented.

THPSC010	The Electron Linear Accelerator LUE-200 - Driver the IREN Facility	electron, target, gun, klystron	346
	V. Kobets, J. Boettcher, A. S. Kayukov, I. N. Meshkov, V. Minashkin, V. G. Pyataev, V. A. Shvets, V. N. Shvetsov, A. P. Sumbaev, V. N. Zamriy JINR, Dubna, Moscow Region P. V. Logachev, V. M. Pavlov BINP SB RAS, Novosibirsk V. Shabratov JINR/VBLHEP, Moscow
	It is reported on startup of the first stage of the Intense REsonance Neutron source installation (IREN) at the Frank Laboratory of Neutron Physics of the Joint Institute for Nuclear Research. The general scheme and current status of the electron linear accelerator with accelerating structure on a S-band traveling wave (f = 2856 MHz) are presented. Results of adjustment of the basic functional systems of the linac and the measured parameters of the beam (pulse current of a beam – 3.0 A, electron energy - 30 MeV; duration of a pulse current - 100 ns; rep. rate - 50 Hz) are reported. The integral neutron yield from nonmultiplying target reaches (3…5)*1010 n/s.

THPSC029	UEL-10-D New Linear Electron Accelerator for Non-Destructive Testing	electron, target, controls, power-supply	382
	I. Yu. Vakhrushin, V. Alexeev, L. Z. Kavalerchik, A. P. Klinov, A. S. Krestianinov, K. N. Maslov, Yu. P. Shchepin, M. F. Vorogushin NIIEFA, St. Petersburg
	A compact accelerator UEL-10-D for radiographic inspection of steel products up to 500mm thick has been designed and manufactured. The accelerator provides the 10 MeV energy and the photon dose rate 1m from target of 30Gy/min. The accelerator consists of an irradiator mounted on a yoke, heat-exchanger and industrial panel computer. The equipment of the accelerator is mostly located inside the irradiator including the HV power supply system, magnetron modulator and control system blocks. Using this yoke, the irradiator is installed on a bridge crane, which ensures its high manoerability necessary to test products of complicated geometry. Size of the irradiator without yoke is 2040950950 mm. In 2010, the accelerator was put into operation at the "Izhorskie Zavody", St. Petersburg. The UEL-10-D accelerator can be also used in radioscopic or tomographic systems.

THPSC037	Compact Superconducting Synchrocyclotrons at Magnetic Field Level of up to 10 T for Proton and Carbon Therapy	proton, cyclotron, synchro-cyclotron, ion	393
	A. I. Papash, G. A. Karamysheva JINR, Dubna, Moscow Region L. M. Onischenko JINR/DLNP, Dubna, Moscow region
	Based on brief analysis of accelerators widely used for proton-ion therapy and patient cure during last 20 years the feasibility and importance of compact superconducting synchrocyclotrons operating at magnetic field level up to 10 T is outlined. The main component of modern commercial facility for proton-ion therapy is an isochronous cyclotron with room temperature or superconducting coils accelerating protons up to 250 MeV as well as synchrotron accelerating carbon ions up to 400 MeV/A. Usually ions are delivered from accelerator into the treatment room by transport lines. Irradiation is done by system of pointed to the patient magnets, collimators, energy degraders which are attached to the rotating Gantry. To greatly reduce price of facility (almost in one order of magnitude) and to simplify operational conditions of hospital personal it is proposed to provide iso-centric rotation of compact superconducting synchrocyclotron around the patient. Main physical and technical parameters are described in the paper.

THPSC038	Tuning of the INR Therapeutic Proton Beam	proton, scattering, vacuum, quadrupole	396
	M. I. Grachev, S. V. Akulinichev, Y. K. Gavrilov, E. V. Ponomareva, V. N. Vasiliev RAS/INR, Moscow V. N. Zapolsky IHEP Protvino, Protvino, Moscow Region
	The scheme of formation of a therapeutic proton beam of the INR RAS Experimental Complex is described. Parameters of a beam and results of measurement of the absorbed doses by the analyser Wellhofer WP600 are presented.

FRCHB03	Status of ILU-14 Electron Accelerator	electron, coupling, cathode, feedback	411
	V. S. Podobaev, V. V. Bezuglov, A. A. Bryazgin, K. N. Chernov, V. G. Cheskidov, B. L. Faktorovich, V. A. Gorbunov, I. V. Gornakov, A. V. Ivanov, E. N. Kokin, M. V. Korobeynikov, A. N. Lukin, I. Makarov, N. V. Matyash, S. A. Maximov, G. N. Ostreiko, A. D. Panfilov, V. M. Radchenko, N. D. Romashko, G. V. Serdobintsev, A. V. Sidorov, V. V. Tarnetsky, M. A. Tiunov, V. O. Tkachenko BINP SB RAS, Novosibirsk
	A new high power (up to 100 kW) industrial linear electron accelerator ILU-14 for energy of 7.5–10 MeV is under construction at Budker INP. The accelerator operates at 176 MHz with total efficiency of 26 %, its modular structure allows the electron energy and beam current to be varied within certain limits by changing the modular arrangement. The 5 MeV prototype of the accelerator was created and successfully tested in 2009. The designed average beam current of 600 mA with pulsed power of 2.5 MW and accelerating structure electron efficiency of 68 % were obtained during experiments. Applying an additional RF voltage to the electron gun cathode-grid gap allowed a beam current passing of 96 % with minor beam energy spread. The paper presents results of the numerical and experimental study of the accelerator systems together with the latest tests on the accelerator prototype.
	Slides