RuPAC-2010 - List of Keywords (acceleration)

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

acceleration

Paper	Title	Other Keywords	Page
TUCHY01	Muon Collider Design Status	emittance, collider, proton, target	20
	Y. Alexahin Fermilab, Batavia
	Muon Collider (MC) - proposed by G. I. Budker and A. N. Skrinsky almost half a century ago - is now considered as the most exciting option for the energy frontier machine in the post-LHC era. A national Muon Accelerator Program (MAP) is being formed in the USA with the ultimate goal of building a MC at the Fermilab site with c.o.m. energy in the range 1.5-3 TeV and luminosity of ~1-5*10³⁴ cm^-2s-1. As the first step on the way to MC it envisages construction of a Neutrino Factory (NF) for high-precision neutrino experiments. The baseline scheme of the NF-MC complex is presented and possible options for its main components are discussed.
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TUCHC01	Concepts for Rasing RF Breakdown Threshold by Using Multi-Moded Cavities	electron, coupling, cathode, radiation	24
	S. V. Kuzikov IAP/RAS, Nizhny Novgorod J. L. Hirshfield Yale University, Physics Department, New Haven, CT Y. Jiang Yale University, Beam Physics Laboratory, New Haven, Connecticut S. Kazakov, M. E. Plotkin, A. A. Vikharev Omega-P, Inc., New Haven, Connecticut
	Funding: Work sponsored by in part by US Department of Energy, Office of High Energy Physics (2009). Two multi-mode cavity designs aimed at increasing accelerating gradient are developed. The cavity of the first type has circular cross-section but allows excitation of several equidistantly-spaced eigenmodes by a bunched drive beam. This multi-mode excitation allows to reduce exposure time of the cavity surface by high field, which in this case occupies smaller area. This feature promises to provide more than 30% raise of the threshold in a 3-mode cavity. The second cavity type is axisymmetric but longitudinally asymmetric, and is excited in one mode at the fundamental frequency and the other at the second harmonic. Superposition of these modes always produces a low field on one cavity wall and a high field on the other, with the latter directed so as to prevent electron emission. This feature is also expected to raise the breakdown threshold. Computations show that a structure using such cavities might support an accelerating gradient up to 47% greater than that for a structure using similar single-mode cavities.
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TUCHZ02	Maintenance of ITEP-TWAC Facility Operation and Machine Capabilities Development	ion, laser, proton, injection	32
	N. N. Alexeev, P. N. Alekseev, A. Balabaev, V. I. Nikolaev, Yu. A. Satov, V. A. Schegolev, B. Y. Sharkov, A. Shumshurov, V. P. Zavodov ITEP, Moscow
	Funding: This work is supported by ROSATOM The ITEP-TWAC facility operation with proton and heavy ion beams for ~4000 hours per year in several modes of beam acceleration and accumulation is determined by present-day demands of different beam users in the frame of current machine resources. Displacement of state interests from fundamental research to strictly-practical tasks stimulates multimode operation of accelerators with trend of beam using for applications. Mastering of Ag¹⁹⁺ ions acceleration in the UK ring up to the energy of 100 MeV/u and Fe²⁶⁺ beam stacking in the U-10 ring at the energy of >200 MeV/u in addition to routine operation with C⁶⁺ beam at energy of 200-400 MeV/u with fast and slow extraction of circulating beam clear the way to beam using for a lot of applications requiring extension of the facility experimental area. Development of laser ion source technology takes aim at high current and high charge state ions generation for elements with A ~60 to be effectively stacked in the U-10 ring with multiple charge exchange injection technique. The machine maintenance efforts and current activities aiming at both subsequent improvement of beam parameters and extending of beam applications are presented
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TUPSA007	Thermal Balance of Multilayered Tunable Dielectric Loaded Wakefield Accelerating Structure	induction, vacuum, radiation, electromagnetic-fields	50
	I. L. Sheynman LETI, Saint-Petersburg A. Kanareykin Euclid TechLabs, LLC, Solon, Ohio I. Ya. Sheynman St. Petersburg State Polytechnic University, St. Petersburg
	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) Thermal balance of a cylindrical tunable multilayer dielectric-filled accelerating structure is considered. One ceramic layer of the structure possesses ferroelectric properties, which allow the waveguide frequency spectrum to be tuned by varying the permittivity of the ferroelectric layer. Dielectric and induction losses in ferroelectric layer and a metal shell leads to a structure warming up and increasing temperature of the ferroelectric layer. Because of a temperature sensitivity of dielectric permittivity of ferroelectric layer this effect may detune the accelerating structure. On the basis of the analysis of a thermal regime of multilayered wakefield structure the medium and pulse temperature deviations are determined. A repetition rate of electronic bunch series should be chosen to limit temperature detuning.

TUPSA009	Interbunch Energy Exchange in the Accelerating Scheme with Uniform Charge Distribution	extraction, electron, vacuum, focusing	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.

TUPSA027	The Compact Faraday Cup for Radiobiological Researches in IHEP Accelerators Beams	vacuum, ion, proton, electron	95
	A. V. Koshelev, Y. Antipov, G. A. Dantsevich, A. V. Larionov, V. S. Seleznev IHEP Protvino, Protvino, Moscow Region
	IHEP’s experts are currently working on the creation of a medical irradiation centre with beams of protons and carbon ions on the basis of an accelerating complex. Already existing accelerators I-100 - U-1,5 - U-70 are forming a complete chain capable of accelerating not only protons, but also, due to certain modifications, light deuteron and carbon nucleus. The compact autonomic Faraday cup which works in the atmospheric environment has been developed to measure currents in the accelerators beams. The device has a good electromagnetic protection. It is compact and allows to make measurements on any (from 600 mm long) open site of a beam line. Vacuum tests and work with biological samples on a beam of protons of I-100 accelerator have proved that the Faraday cup is meeting all the requirements.

TUPSA035	Shapes of Nuclear Induction Signals under Inhomogeneous Magnetic Fields	induction, resonance, radio-frequency, site	119
	V. G. Ryzhov MRTI RAS, Moscow
	The influence of the inhomogeneous magnetic field on the shape of nuclear induction signals is analyzed. The most frequent five of magnetic field distributions: Lorentz, Gaussian, exponential, triangular and ideal “square”- are described. Nonideal "square" distributions that have finite duration pulse edges variable by Lorentz, Gaussian, exponential and triangular dependences are considered. The signal change as a result of placing of nuclear spins under the constant gradient magnetic field is studied. All results have been found in the analytical form taking into an account the magnetic screening effect of atomic nuclei.

TUPSA039	HV Electron Cooler for the NICA Collider	electron, gun, cathode, collider	125
	I. N. Meshkov, E. V. Ahmanova, A. G. Kobets, R. Pivin, A. Yu. Rudakov, A. V. Smirnov, N. D. Topilin, Yu. A. Tumanova, S. Yakovenko JINR, Dubna, Moscow Region A. A. Filippov Allrussian Electrotechnical Institute, Moskow A. V. Philippov, A. V. Shabunov JINR/VBLHEP, Dubna, Moscow region
	The goal of the cooling system of the NICA collider is to meet the required parameters of ion beams in energy range of 1 - 4.5GeV/u that corresponds to the 0.5 - 2.5 MeV of the electron energy. The electron cooler project is developed according to the world experience of similar systems consruction. The main peculiarity of the electron cooler for the NICA collider is use of two cooling electron beams (one electron beam per each ring of the collider) that never has been done before. The acceleration and deceleration of the electron beams is produced by common high-voltage generator. The cooler consists of three tanks. Two of them contain acceleration/deceleration tubes and are immersed in superconducting solenoids. The third one contains HV generator. The scheme of the electron cooler, its main parameters and operation regime are presented.

WECHA01	Status of the Nuclotron	ion, vacuum, heavy-ion, ion-source	127
	A. O. Sidorin, N. N. Agapov, V. Aleksandrov, V. Batin, A. V. Butenko, E. D. Donets, A. V. Eliseev, A. Govorov, V. Karpinsky, V. D. Kekelidze, H. G. Khodzhibagiyan, A. Kirichenko, A. D. Kovalenko, O. S. Kozlov, I. N. Meshkov, V. A. Mikhailov, V. Monchinsky, S. Romanov, V. Shevtsov, A. N. Sissakian, I. Slepnev, V. Slepnev, G. V. Trubnikov, B. Vasilishin, V. Volkov JINR, Dubna, Moscow Region O. I. Brovko JINR/VBLHEP, Moscow
	The 'Nuclotron-M' project started in 2007 is considered as the key point of the first stage of the NICA/MPD project. General goal of the 'Nuclotron-M' project is to prepare all the systems of the Nuclotron for its long and reliable operation as a part of the NICA collider injection chain. Additionally the project realization will increase the Nuclotron ability for realization of its current experimental program. Results of the last runs of the Nuclotron operation are presented.
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WECHA02	Acceleration of Deuterons up to 23.6 GeV per Nucleon through I100, U1.5, and U70 of IHEP	light-ion, ion, proton, synchrotron	130
	S. V. Ivanov IHEP Protvino, Protvino, Moscow Region
	The paper* reports on the recent progress en route of implementing the program of accelerating light ions in the Accelerator Complex U70 of IHEP-Protvino. The crucial milestone of guiding the deuteron beam through entire cascade of three accelerators available to a specific kinetic energy of 23.6 GeV per nucleon was accomplished in April 2010, which confirms feasibility of the project goal to diversify our main proton machine U70 to a light-ion synchrotron as well. * On behalf of the U70 staff
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WEPSB009	Acceleration of Heavy Ions in Space Periodic Quadrupole RF Focusing Structure	rfq, focusing, 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.

WEPSB023	Electron Beam Dynamics with Space Charge in Linear Accelerator	electron, linac, space-charge, electromagnetic-fields	215
	Y. A. Fomin, V. Korchuganov RRC, Moscow
	This paper describes electron beam dynamics with space charge in existing linear accelerator of Kurchatov source of synchrotron radiation. The linac structure operates with standing wave mode pulse power and without particle prebuncher. The results of comparison of electron beam parameters at the linac output with and without space charge consideration are presented. Electron beam shaping process starting from continuous beam to bunched beam on initial stage of acceleration under the action both of linac RF field and particle space charge field is considered. The main attention gives to calculate particle space charge field of the electron beam, which bring in essential contribution into beam dynamics on initial stage of shaping and accelerating electron bunches. The results of computer simulation of the electromagnetic field into linac structure taking with the help of ANSYS code are presented.

WEPSB026	Digital Longitudinal Feedback Systems in Synchrotrons	feedback, synchrotron, damping, kicker	224
	V. Zhabitsky JINR, Dubna, Moscow Region
	The stability of a beam in synchrotrons with a digital longitudinal feedback system is treated. A longitudinal feedback system is required in synchrotrons to stabilize the high intensity beams against longitudinal instabilities and to damp the phase injection errors of a bunch. Damping rates of the digital longitudinal feedback system in dependence of its gain and delay are analysed.

THCHB02	SCRF Development at TRIUMF	linac, ion, electron, heavy-ion	292
	V. Zvyagintsev, B. Amini, C. D. Beard, R. J. Dawson, T. Emmens, K. Fong, A. Grassellino, P. R. Harmer, D. Kishi, P. Kolb, A. Koveshnikov, C. Laforge, D. Lang, M. P. Laverty, R. E. Laxdal, R. Leewe, D. Longuevergne, M. Marchetto, A. K. Mitra, T. C. Ries, I. Sekachev, R. W. Shanks, B. S. Waraich, F. Yan, Q. Zheng TRIUMF, Vancouver R. Edinger PAVAC, Richmond, B. C. R. S. Orr, W. Trischuk University of Toronto, Toronto, Ontario
	TRIUMF started SCRF development with the superconducting heavy ion linear accelerator project, ISAC-II, in 2000. Since that time much work has been completed for development, prototyping and testing. The ISAC-II project was successfully completed and we now have in operation 40 superconducting bulk Nb QWR cavities assembled in eight cryomodules. The last twenty cavities, just completed, were produced by PAVAC Industries Inc. of Richmond BC; the first superconducting accelerator cavities produced in Canada. In 2007 TRIUMF started development towards a 50MeV electron superconducting linear accelerator to be used as a driver to produce radioactive ion beams through photofission. The accelerator is based on TTF/ILC elliptical bulk Nb cavities technology. Results, experience and plans of the SCRF program at TRIUMF will be discussed.
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THPSC002	Feasibility of Alternating-Phase Focusing for a Chain of Short Independently-Phased Resonators	linac, focusing, ion, proton	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.

FRCHA03	MCC-30/15 Cyclotron - Parameters, Adjusting Works and their Results	cyclotron, ion, extraction, emittance	408
	A. P. Strokach, P. V. Bogdanov, A. V. Galchuck, V. G. Mudrolubov, M. F. Vorogushin NIIEFA, St. Petersburg
	Medical Compact Cyclotron MCC-30/15 is intended for acceleration of hydrogen and deuterium negative ions in the energy control range. The Cyclotron was designed in the frame of the Contract on delivering of the Cyclotron MCC-30/15 equipment to the Accelerator Laboratory of Jyvaskyla University, Finland. The Cyclotron is built up on the base of the electromagnet of the shielded type with the pole diameter of 140 cm. The Cyclotron is equipped with the external negative hydrogen and deuterium ions injection system. The particle acceleration is performed on fixed frequency (second and fourth harmonics). The beam current of 30-18 MeV protons and 15-9 MeV deuterons extracted into two beam lines is equal to more than 100 mkA and 50 mkA, accordingly. The Cyclotron equipment was delivered to the Buyer, the commissioning work was finished on April 30, 2010.
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