RUPAC2012 - Classification: High intensity cyclic and linear accelerators

Paper

Title

Page

Accelerator Complex U70 of IHEP: Status and Upgrades

85

S.V. Ivanov
IHEP, Moscow Region, Russia

The report overviews present status of the Accelerator Complex U70 of IHEP-Protvino comprising four machines (2 linear accelerators and 2 synchrotrons). Particular emphasis is put on the recent upgrades implemented since the previous conference RuPAC-2010.

Slides WEYCH01 [2.404 MB]

WEYCH02

Multipurpose Research Complex Based on the INR High Intensity Proton Linac

90

L.V. Kravchuk, A. Feschenko, M.I. Grachev, V.L. Serov
RAS/INR, Moscow, Russia

Funding: Russian Academy of Science
Scientific Complex based on the 600 MeV Proton Linac is under operation at the INR, Troitsk, Moscow to provide both basic and applied research. At the moment proton beam from the Linac with energy about 210 MeV and average current about 130 μA is transporting to the Experimental Area to be use for following facilities: three Spallation Neutron sources, the Isotope Production facility and the Beam Therapy complex. Status of the Linac and Experimental Area as well as the tuning procedures to decrease particle loss in high-intensity mode of operation are given in the paper.

Slides WEYCH02 [2.281 MB]

WEACH01

Use of Bent-Crystal Deflectors to Steer Beam in U-70 Accelerator of IHEP - Status and Prospects

95

A.G. Afonin, V.I. Baranov, Y.A. Chesnokov, V.A. Maisheev, V. Terekhov, I.A. Yazynin
IHEP, Moscow Region, Russia

The report presents an overview the results of IHEP activity in the field of study and using bent crystals to steer high-energy proton and ion beam obtained during 2010-2012. The hardware installed to study crystal collimation and extraction is described. A new dedicated beam transfer line was arranged to study the performance of crystals. It has been shown that the crystal deflectors developed are capable of sustaining long-term operation to deliver high-energy extracted beams for fixed-target physics. Experience with practical applications of bent crystals are outlined. First results on the extraction 24.1 GeV/nucleon carbon ions are also presented.

WEXOR01

Development of FLNR JINR Heavy Ions Accelerator Complex (DRIBs III)

G.G. Gulbekyan
JINR, Dubna, Moscow Region, Russia

At present time four isochronous cyclotrons: U-400, U-400M, U-200 and IC-100 are in operation at the JINR FLNR. Total operation time is about 10000 hours per year. The U400M is a primary beam generator and U400 is as postaccelerator in RIB (DRIBs) experiments to produce and accelerate exotic nuclides such as 6He, 8He etc. One of the basic scientific programs which are carried out in FNLR - synthesis of new elements which demands intensive beams of heavy ions. Now U-400 is capable to provide long term experiments on Са 48 beams with intensity of 1 pmkA. In order to improve efficiency of the experiments for the next 7 years it is necessary to obtain the accelerated ion beams with the following parameters. Ion energy 4-8 MeV/n Masses 10-238 Beam intensity (up to A=50) 10 pmkA Beam emittance less 30 pi mm*mrad. These parameters have underlain the project of new cyclotron DC-280.

Slides WEXOR01 [12.911 MB]

WEXOR02

New Developments and a Review of the Accelerator Facilities at iThemba LABS

98

J.L. Conradie, R.A. Bark, A.H. Botha, J.C. Cornell, M.A. Crombie, J.G. De Villiers, J.L.G. Delsink, H. Du Plessis, J.S. Du Toit, W. Duckitt, D.T. Fourie, M.E. Hogan, I.H. Kohler, R.H. McAlister, H.W. Mostert, J.V. Pilcher, P.F. Rohwer, M. Sakildien, J.P. Slabbert, N. Stodart, R.W. Thomae, M.J. Van Niekerk, P.A. van Schalkwyk
iThemba LABS, Somerset West, South Africa
J. Dietrich
DELTA, Dortmund, Germany
M. Poggi
INFN/LNL, Legnaro (PD), Italy

iThemba LABS is a multi-disciplinary research facility that provides accelerator-based facilities for physical, biomedical and material sciences, treatment of cancer patients with neutrons and protons and the production of radioisotopes and radiopharmaceuticals. The successful utilization of beam diagnostic equipment is critical and essential for the effective running of such a facility and will be discussed in more detail. The current status of the facility and future projects, which entail a radioactive-ion beam project as well as a dedicated facility for proton therapy, will also be discussed.

Slides WEXOR02 [6.188 MB]

WEXOR03

Status of PNPI Proton Synchrocyclotron

E.M. Ivanov, G.F. Mikheev, Yu.T. Mironov, G.A. Riabov, B.B. Tokarev
PNPI, Gatchina, Leningrad District, Russia

The proton synchrocyclotron (SC) for acceleration of protons up to 1 GeV kinetics energy is operating in PNPI during a period of 2000-2500 hour per year. SC is used as well for the nuclear as for applied physics researches. In resent years there is a trend to develop the applied program, which includes proton therapy, investigation of the new materials by using spin-rotation method, radiation test on proton beams of the electronic components under licenses from manufacturers. The unique for Europe neutron beam with quasi-atmospheric spectrum for radiation test electronics for aviation and cosmos have been developed. New nuclear medicine program including modernization of the existing 1000 MeV proton therapy, construction of new H-minus 80 MeV isochronous cyclotron for the medicine isotopes production and organization the melanoma treatment facility is in a progress.

WEBCH01

The Status of the SARAF Phase-I Linac

103

L. Weissman, Y. Ben Aliz, D. Berkovits, O. Dudovich, I. Eliyahu, I. Fishman, I.G. Gertz, A. Grin, A. Kreisler, G. Lempert, I. Mardor, A. Perry, E. Reinfeld, J. Rodnizki
Soreq NRC, Yavne, Israel

Phase I of the Soreq Applied Research Accelerator Facility - SARAF is under operation at the Soreq Nuclear Research Center. According to Phase I design specifications, SARAF superconducting linear RF accelerator should yield 2 mA protons and deuterons CW beams at energies up to 4 and 5 MeV, respectively. The status of Phase I main components is reported as well as the beam operation experience accumulated recently. The latter include acceleration of a 1 mA CW protons beam up to 3.5 MeV and 1 mA pulsed, duty cycle of few %, deuterons beam to up to 4.7 MeV. Further planned improvements in the current facility and plans for the future Phase II of the SARAF linac are discussed.

Slides WEBCH01 [7.617 MB]

WEBCH02

Development, Testing and Commissioning of Powerful High Voltage Electron Accelerator

N.G. Tolstun, V.P. Bagrievich, A.V. Efremov, A.N. Kuzhlev, A.I. Machecha, V.P. Maznev, V.P. Ovchinnikov, D.E. Pavlukhov, M.P. Svinin
NIIEFA, St. Petersburg, Russia

A powerful high voltage electron accelerator has been designed for the use in installations for purifying of flue gases of thermal power plants (primarily, coal-fired electric power plants) from sulfur and nitrogen oxides. The design parameters of the accelerator are as follows: the energy is 1 MeV and the power is up to 500 kW in the continuous mode. A three-phase transformer-rectifier with a closed magnetic circuit operating at a frequency of 50 Hz is used as a high-voltage generator. The high-voltage generator and accelerating structure are located in a common high-pressure vessel filled with an insulating gas. Accelerated electron beam is scanned in a vacuum chamber of triangular shape and further is extracted into the atmosphere through an outlet window combined of four parallel sections measuring 60x2400 mm and covered with metal foil. The report presents the results of the development, testing of the accelerator on a NIIEFA testing facility and commissioning.

WEBOR01

The C-80 Cyclotron System. Technical Characteristics, Current Status, Progress and Prospects.

106

Yu.N. Gavrish, P.V. Bogdanov, A.V. Galchuck, S.V. Grigorenko, V.I. Grigoriev, L.E. Korolev, A.N. Kuzhlev, Yu.D. Menshov, V.G. Mudrolyubov, V.I. Ponomarenko, Yu.I. Stogov, A.P. Strokach, S.S. Tsygankov, I.N. Vasilchenko
NIIEFA, St. Petersburg, Russia
S.A. Artamonov, E.M. Ivanov, G.F. Mikheev, G.A. Riabov, V.M. Samsonov
PNPI, Gatchina, Leningrad District, Russia

A C-80 cyclotron system is intended to produce proton beams with an energy ranging from 40 up to 80 MeV and current up to 200 mkA. The beams with these parameters will be used for commercial production of a wide spectrum of isotopes for medicine, proton radiation therapy of eye diseases and superficial oncologic diseases as well as for fundamental and applied researches. Manufacturing and installation of the cyclotron equipment and first section of the system for the beam transport to remote targets have been finished. Physical start-up of the cyclotron has been realized. In future, the C-80 cyclotron is supposed to be used as an injector of the C-230 synchrotron, which serves for additional acceleration of the extracted proton beam to energies of the order of 230 MeV. This will allow the Bragg's peak-based treatment procedures to be applied in the proton therapy of oncologic patients.

WEBOR02

Some Design Features of the 80 MeV H⁻ Isochronous Cyclotron at Gatchina

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 WEBOR02 [1.952 MB]

WEPPC001

A Simulation Study on Accelerator Cavities for a SW Linac

445

N. Khosravi
Zanjan University, Zanjan, Iran
E.E. Ebrahimibasabi, S.A.H. Feghhi
sbu, Tehran, Iran

An on axis-coupled cavity structure has been studied using S-band microwaves at 2856 MHz, suitable for industrial and research applications. It uses a bi-periodic SW structure with constant impedance that operates at pi/2 mode. This structure consist Kidney-like shaped slots, placed symmetrically with respect to the accelerating axis. We compared Different shapes, places and sizes of slots with respect to coupling coefficient, resonance frequency and some of cavity parameters. Sensitivity analyses of accelerating cavity on details of structure have been done and their behavior, with respect to the resonance frequency has been presented. According to the simulation result using SUPERFISH and CST Studio package, each accelerating cavity is capable to deliver 0.56 MeV to electrons in a 50 mA beam.

WEPPC002

RF Design and Tuning of Linac4 RFQ

448

A. France, M. Desmons, O. Piquet
CEA/DSM/IRFU, France
C. Rossi
CERN, Geneva, Switzerland

In the Linac4 (a part of CERN accelerator complex upgrade), a 3 MeV, 3-meter long, 352 MHz RFQ accelerates a 70 mA H⁻ ion beam from source to DTL input energy. RF design and tuning both rely on the same 4-wire transmission model (TLM), which ensures a consistent control of all RF parameters. 3D simulations are used to determine electrical parameters of TLM in the design process. RFQ end-circuits are designed to minimize sensitivity of RFQ voltage profile to perturbations that might occur during operation, and are tuned with quadrupole rods. Slug tuners size and distribution take into account fabrication tolerances and bead-pull measurement constraints. The three 1-meter long RFQ sections are machined and brazed in CERN. RF bead-pull measurements used to estimate RFQ electrical parameters throughout fabrication steps have not revealed any significant departure from expected values. Vacuum ports position is also adjusted prior to braze using RF measurements. Electrical parameters of end-circuits are derived from sets of five linearly independent bead-pull measurements. Slugs are tuned using a closed-loop algorithm, where "command" quantities are tuner positions, "control" quantities are measured fields, and RFQ inverse transfer function is based on the TLM. Tuning convergence and final accuracy will be presented.

WEPPC003

Beam Pulse Separation System of INR Linac

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.

WEPPC004

Maximum Value of the Standing Wave and Travelling Wave Accelerating Structures Electronic Efficiency

453

S. Proskin, A. Kulago
MEPhI, Moscow, Russia

A new theoretical approach for a calculation of the standing wave structure electronic efficiency is described. As a result the electronic efficiency of the biperiodic structure is evaluated regarding a new definition

WEPPC005

Extreme Density Charge Electron Bunches

456

S. Proskin, A. Kulago
MEPhI, Moscow, Russia

This paper presents untraditional approach for obtaining the DLWG limited bunch charge (LBC). The maximum energy of accelerated bunch is considered. As a result the bremsstrahlung maximum dose rate evaluation is obtained

WEPPC008

Biperiodic Accelerating Structure with Inner Coupling Cells with an Increased Coupling Coefficient

458

M. Gusarova, I.I. Petrushina, E.A. Savin, N.P. Sobenin, D.B. Tikhonov
MEPhI, Moscow, Russia

Results on coupling increase research for biperiodic accelerating structure featuring high effective shunt impedance and other electrodynamical characteristics are presented. Accelerating structure for sample facility was designed taking into consideration thermal issues and multipactor discharge immunity.

WEPPC009

Using Genetic Algorithms for Electrode Shape Optimization in Accelerators with RF Focusing

461

A.V. Samoshin, K.A. Aliev, S.M. Polozov
MEPhI, Moscow, Russia

The drift tubes shape choice which provides the require distribution of the spatial harmonics amplitudes of RF field is an important problem in the design of RF focusing accelerators. It is necessary to have various relationships of the main (accelerating) and the first (as main focusing) harmonics of RF field for different types of accelerators. High order harmonics should be negligible for accelerators with an external focusing, and this ratio should be E1/E0 = 3-5 for the efficient operation of the axially symmetric RF focusing accelerator. Thus, the distribution and harmonic amplitude's ratios at the accelerator axis which provides stable beam dynamics are always known. The drift tubes shape study problem cannot be solved directly by ordinary methods because of unknown boundary conditions belongs to a class of ill-posed problem. At present, this problem can be solved by using genetic algorithms (GA). For this purpose, the electrode shape will be represent as the polynomial function, and then solve the Laplace equation with boundary conditions of Dirichlet and Neumann. The necessary electrodes shape can be quickly and easily simulated using the adaptive search.

WEPPC010

H-Cavity Based Accelerating Structure for Proton Accelerator

464

M.V. Lalayan, A.A. Kalashnikova, S.E. Toporkov
MEPhI, Moscow, Russia

Funding: Work is supported by "scientific stuff" grant of The Ministry of Education and Science of the Russian Federation
Cavity for proton accelerator operating in 0.01 to 0.04 phase velocity range optimization results with respect to electrodynamical parameters are presented. H-type based cavity for two operating frequencies 145 MHz and 433 MHz was considered. Influence of cavity shape and dimensions on most important EDCs – relative shunt impedance, quality factor and transient time factor was studied. Influence of high order modes on beam dynamics was considered.

WEPPC011

Modernisation of an Initial Part the MILAC Heavy Ion Linear Accelerator

466

V.A. Bomko, A.P. Kobets, V.V. Panov, K.V. Pavlij, G.V. Sotnikov, B.V. Zajtsev
NSC/KIPT, Kharkov, Ukraine

New pre-stripping section (PSS-20) the MILAC heavy ion linear accelerator with the relation of their mass to charge A/q=20 is developed. That will allow to extend considerably a range accelerating ions and to increase intensity of beams. On an initial part of acceleration of ions from 6 keV/u up to 150 keV/u high capture in process of acceleration of the injected ions is provided interdigital (IH) accelerating structure with Radio-Frequency Quadrupole (RFQ) focusing. On the second part of acceleration of ions from 150 keV/u up to 1 MeV/u the highest rate of acceleration is created interdigital (IH) accelerating structure with drift tubes. Mathematical modeling geometrical and dynamic characteristics of accelerating structures pre-stripping section PSS-20 is executed. Dynamics of heavy ions in the course of acceleration is optimised.

WEPPC012

Progress in Booster Design in the NICA Project

A.V. Butenko, A. Tuzikov
JINR/VBLHEP, Moscow, Russia
H.G. Khodzhibagiyan, I.N. Meshkov, V.A. Mikhailov, G.V. Trubnikov, A.S. Valkovich
JINR, Dubna, Moscow Region, Russia

In the framework of the NICA project the new Booster lattice is designing. The NICA layout includes Electron String Ion Source, 3 Mev/u linac, 600 MeV/u booster synchrotron, upgraded Nuclotron and ion collider. The main goals of the Booster are the following: accumulation of 2*E9 Au³²⁺ ions; acceleration of the heavy ions up to energy required for effective stripping; forming of the required beam emittance with electron cooling system. The present layout makes it possible to place the Booster having 211 m circumference and four fold symmetry lattice inside the yoke of the Synchrophasotron. The features of this booster, the requirement to the main synchrotron systems and their parameters are presented in this paper.

WEPPC013

Novel DTL Section for ITEP-TWAC Heavy Ion Injector

469

V. Andreev, N.N. Alexeev, A. Kolomiets, V.A. Koshelev
ITEP, Moscow, Russia
A.S. Plastun
MEPhI, Moscow, Russia

A novel 81.5 MHz H-type drift tube (DTL) accelerating structure with rf quadrupoles following RFQ in the new injector I-4 for acceleration ions up to energy about 5 MeV/u for ITEP TWAC facility has been proposed. It is based on a combination of a DTL structure and the resonator with magnetic coupling windows. Computer simulations show that it can provide some advantages in comparison with conventional IH-DTL structure. Results of both electrodynamics and beam dynamics computer simulations of the structure as well as a new approach for beam matching RFQ and the section are presented.

Paper	Title	Page
WEYCH01	Accelerator Complex U70 of IHEP: Status and Upgrades	85
	S.V. Ivanov IHEP, Moscow Region, Russia
	The report overviews present status of the Accelerator Complex U70 of IHEP-Protvino comprising four machines (2 linear accelerators and 2 synchrotrons). Particular emphasis is put on the recent upgrades implemented since the previous conference RuPAC-2010.
	Slides WEYCH01 [2.404 MB]

WEYCH02	Multipurpose Research Complex Based on the INR High Intensity Proton Linac	90
	L.V. Kravchuk, A. Feschenko, M.I. Grachev, V.L. Serov RAS/INR, Moscow, Russia
	Funding: Russian Academy of Science Scientific Complex based on the 600 MeV Proton Linac is under operation at the INR, Troitsk, Moscow to provide both basic and applied research. At the moment proton beam from the Linac with energy about 210 MeV and average current about 130 μA is transporting to the Experimental Area to be use for following facilities: three Spallation Neutron sources, the Isotope Production facility and the Beam Therapy complex. Status of the Linac and Experimental Area as well as the tuning procedures to decrease particle loss in high-intensity mode of operation are given in the paper.
	Slides WEYCH02 [2.281 MB]

WEACH01	Use of Bent-Crystal Deflectors to Steer Beam in U-70 Accelerator of IHEP - Status and Prospects	95
	A.G. Afonin, V.I. Baranov, Y.A. Chesnokov, V.A. Maisheev, V. Terekhov, I.A. Yazynin IHEP, Moscow Region, Russia
	The report presents an overview the results of IHEP activity in the field of study and using bent crystals to steer high-energy proton and ion beam obtained during 2010-2012. The hardware installed to study crystal collimation and extraction is described. A new dedicated beam transfer line was arranged to study the performance of crystals. It has been shown that the crystal deflectors developed are capable of sustaining long-term operation to deliver high-energy extracted beams for fixed-target physics. Experience with practical applications of bent crystals are outlined. First results on the extraction 24.1 GeV/nucleon carbon ions are also presented.

WEXOR01	Development of FLNR JINR Heavy Ions Accelerator Complex (DRIBs III)
	G.G. Gulbekyan JINR, Dubna, Moscow Region, Russia
	At present time four isochronous cyclotrons: U-400, U-400M, U-200 and IC-100 are in operation at the JINR FLNR. Total operation time is about 10000 hours per year. The U400M is a primary beam generator and U400 is as postaccelerator in RIB (DRIBs) experiments to produce and accelerate exotic nuclides such as 6He, 8He etc. One of the basic scientific programs which are carried out in FNLR - synthesis of new elements which demands intensive beams of heavy ions. Now U-400 is capable to provide long term experiments on Са 48 beams with intensity of 1 pmkA. In order to improve efficiency of the experiments for the next 7 years it is necessary to obtain the accelerated ion beams with the following parameters. Ion energy 4-8 MeV/n Masses 10-238 Beam intensity (up to A=50) 10 pmkA Beam emittance less 30 pi mm*mrad. These parameters have underlain the project of new cyclotron DC-280.
	Slides WEXOR01 [12.911 MB]

WEXOR02	New Developments and a Review of the Accelerator Facilities at iThemba LABS	98
	J.L. Conradie, R.A. Bark, A.H. Botha, J.C. Cornell, M.A. Crombie, J.G. De Villiers, J.L.G. Delsink, H. Du Plessis, J.S. Du Toit, W. Duckitt, D.T. Fourie, M.E. Hogan, I.H. Kohler, R.H. McAlister, H.W. Mostert, J.V. Pilcher, P.F. Rohwer, M. Sakildien, J.P. Slabbert, N. Stodart, R.W. Thomae, M.J. Van Niekerk, P.A. van Schalkwyk iThemba LABS, Somerset West, South Africa J. Dietrich DELTA, Dortmund, Germany M. Poggi INFN/LNL, Legnaro (PD), Italy
	iThemba LABS is a multi-disciplinary research facility that provides accelerator-based facilities for physical, biomedical and material sciences, treatment of cancer patients with neutrons and protons and the production of radioisotopes and radiopharmaceuticals. The successful utilization of beam diagnostic equipment is critical and essential for the effective running of such a facility and will be discussed in more detail. The current status of the facility and future projects, which entail a radioactive-ion beam project as well as a dedicated facility for proton therapy, will also be discussed.
	Slides WEXOR02 [6.188 MB]

WEXOR03	Status of PNPI Proton Synchrocyclotron
	E.M. Ivanov, G.F. Mikheev, Yu.T. Mironov, G.A. Riabov, B.B. Tokarev PNPI, Gatchina, Leningrad District, Russia
	The proton synchrocyclotron (SC) for acceleration of protons up to 1 GeV kinetics energy is operating in PNPI during a period of 2000-2500 hour per year. SC is used as well for the nuclear as for applied physics researches. In resent years there is a trend to develop the applied program, which includes proton therapy, investigation of the new materials by using spin-rotation method, radiation test on proton beams of the electronic components under licenses from manufacturers. The unique for Europe neutron beam with quasi-atmospheric spectrum for radiation test electronics for aviation and cosmos have been developed. New nuclear medicine program including modernization of the existing 1000 MeV proton therapy, construction of new H-minus 80 MeV isochronous cyclotron for the medicine isotopes production and organization the melanoma treatment facility is in a progress.

WEBCH01	The Status of the SARAF Phase-I Linac	103
	L. Weissman, Y. Ben Aliz, D. Berkovits, O. Dudovich, I. Eliyahu, I. Fishman, I.G. Gertz, A. Grin, A. Kreisler, G. Lempert, I. Mardor, A. Perry, E. Reinfeld, J. Rodnizki Soreq NRC, Yavne, Israel
	Phase I of the Soreq Applied Research Accelerator Facility - SARAF is under operation at the Soreq Nuclear Research Center. According to Phase I design specifications, SARAF superconducting linear RF accelerator should yield 2 mA protons and deuterons CW beams at energies up to 4 and 5 MeV, respectively. The status of Phase I main components is reported as well as the beam operation experience accumulated recently. The latter include acceleration of a 1 mA CW protons beam up to 3.5 MeV and 1 mA pulsed, duty cycle of few %, deuterons beam to up to 4.7 MeV. Further planned improvements in the current facility and plans for the future Phase II of the SARAF linac are discussed.
	Slides WEBCH01 [7.617 MB]

WEBCH02	Development, Testing and Commissioning of Powerful High Voltage Electron Accelerator
	N.G. Tolstun, V.P. Bagrievich, A.V. Efremov, A.N. Kuzhlev, A.I. Machecha, V.P. Maznev, V.P. Ovchinnikov, D.E. Pavlukhov, M.P. Svinin NIIEFA, St. Petersburg, Russia
	A powerful high voltage electron accelerator has been designed for the use in installations for purifying of flue gases of thermal power plants (primarily, coal-fired electric power plants) from sulfur and nitrogen oxides. The design parameters of the accelerator are as follows: the energy is 1 MeV and the power is up to 500 kW in the continuous mode. A three-phase transformer-rectifier with a closed magnetic circuit operating at a frequency of 50 Hz is used as a high-voltage generator. The high-voltage generator and accelerating structure are located in a common high-pressure vessel filled with an insulating gas. Accelerated electron beam is scanned in a vacuum chamber of triangular shape and further is extracted into the atmosphere through an outlet window combined of four parallel sections measuring 60x2400 mm and covered with metal foil. The report presents the results of the development, testing of the accelerator on a NIIEFA testing facility and commissioning.

WEBOR01	The C-80 Cyclotron System. Technical Characteristics, Current Status, Progress and Prospects.	106
	Yu.N. Gavrish, P.V. Bogdanov, A.V. Galchuck, S.V. Grigorenko, V.I. Grigoriev, L.E. Korolev, A.N. Kuzhlev, Yu.D. Menshov, V.G. Mudrolyubov, V.I. Ponomarenko, Yu.I. Stogov, A.P. Strokach, S.S. Tsygankov, I.N. Vasilchenko NIIEFA, St. Petersburg, Russia S.A. Artamonov, E.M. Ivanov, G.F. Mikheev, G.A. Riabov, V.M. Samsonov PNPI, Gatchina, Leningrad District, Russia
	A C-80 cyclotron system is intended to produce proton beams with an energy ranging from 40 up to 80 MeV and current up to 200 mkA. The beams with these parameters will be used for commercial production of a wide spectrum of isotopes for medicine, proton radiation therapy of eye diseases and superficial oncologic diseases as well as for fundamental and applied researches. Manufacturing and installation of the cyclotron equipment and first section of the system for the beam transport to remote targets have been finished. Physical start-up of the cyclotron has been realized. In future, the C-80 cyclotron is supposed to be used as an injector of the C-230 synchrotron, which serves for additional acceleration of the extracted proton beam to energies of the order of 230 MeV. This will allow the Bragg's peak-based treatment procedures to be applied in the proton therapy of oncologic patients.

WEBOR02	Some Design Features of the 80 MeV H⁻ Isochronous Cyclotron at Gatchina	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 WEBOR02 [1.952 MB]

WEPPC001	A Simulation Study on Accelerator Cavities for a SW Linac	445
	N. Khosravi Zanjan University, Zanjan, Iran E.E. Ebrahimibasabi, S.A.H. Feghhi sbu, Tehran, Iran
	An on axis-coupled cavity structure has been studied using S-band microwaves at 2856 MHz, suitable for industrial and research applications. It uses a bi-periodic SW structure with constant impedance that operates at pi/2 mode. This structure consist Kidney-like shaped slots, placed symmetrically with respect to the accelerating axis. We compared Different shapes, places and sizes of slots with respect to coupling coefficient, resonance frequency and some of cavity parameters. Sensitivity analyses of accelerating cavity on details of structure have been done and their behavior, with respect to the resonance frequency has been presented. According to the simulation result using SUPERFISH and CST Studio package, each accelerating cavity is capable to deliver 0.56 MeV to electrons in a 50 mA beam.

WEPPC002	RF Design and Tuning of Linac4 RFQ	448
	A. France, M. Desmons, O. Piquet CEA/DSM/IRFU, France C. Rossi CERN, Geneva, Switzerland
	In the Linac4 (a part of CERN accelerator complex upgrade), a 3 MeV, 3-meter long, 352 MHz RFQ accelerates a 70 mA H⁻ ion beam from source to DTL input energy. RF design and tuning both rely on the same 4-wire transmission model (TLM), which ensures a consistent control of all RF parameters. 3D simulations are used to determine electrical parameters of TLM in the design process. RFQ end-circuits are designed to minimize sensitivity of RFQ voltage profile to perturbations that might occur during operation, and are tuned with quadrupole rods. Slug tuners size and distribution take into account fabrication tolerances and bead-pull measurement constraints. The three 1-meter long RFQ sections are machined and brazed in CERN. RF bead-pull measurements used to estimate RFQ electrical parameters throughout fabrication steps have not revealed any significant departure from expected values. Vacuum ports position is also adjusted prior to braze using RF measurements. Electrical parameters of end-circuits are derived from sets of five linearly independent bead-pull measurements. Slugs are tuned using a closed-loop algorithm, where "command" quantities are tuner positions, "control" quantities are measured fields, and RFQ inverse transfer function is based on the TLM. Tuning convergence and final accuracy will be presented.

WEPPC003	Beam Pulse Separation System of INR Linac	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.

WEPPC004	Maximum Value of the Standing Wave and Travelling Wave Accelerating Structures Electronic Efficiency	453
	S. Proskin, A. Kulago MEPhI, Moscow, Russia
	A new theoretical approach for a calculation of the standing wave structure electronic efficiency is described. As a result the electronic efficiency of the biperiodic structure is evaluated regarding a new definition

WEPPC005	Extreme Density Charge Electron Bunches	456
	S. Proskin, A. Kulago MEPhI, Moscow, Russia
	This paper presents untraditional approach for obtaining the DLWG limited bunch charge (LBC). The maximum energy of accelerated bunch is considered. As a result the bremsstrahlung maximum dose rate evaluation is obtained

WEPPC008	Biperiodic Accelerating Structure with Inner Coupling Cells with an Increased Coupling Coefficient	458
	M. Gusarova, I.I. Petrushina, E.A. Savin, N.P. Sobenin, D.B. Tikhonov MEPhI, Moscow, Russia
	Results on coupling increase research for biperiodic accelerating structure featuring high effective shunt impedance and other electrodynamical characteristics are presented. Accelerating structure for sample facility was designed taking into consideration thermal issues and multipactor discharge immunity.

WEPPC009	Using Genetic Algorithms for Electrode Shape Optimization in Accelerators with RF Focusing	461
	A.V. Samoshin, K.A. Aliev, S.M. Polozov MEPhI, Moscow, Russia
	The drift tubes shape choice which provides the require distribution of the spatial harmonics amplitudes of RF field is an important problem in the design of RF focusing accelerators. It is necessary to have various relationships of the main (accelerating) and the first (as main focusing) harmonics of RF field for different types of accelerators. High order harmonics should be negligible for accelerators with an external focusing, and this ratio should be E1/E0 = 3-5 for the efficient operation of the axially symmetric RF focusing accelerator. Thus, the distribution and harmonic amplitude's ratios at the accelerator axis which provides stable beam dynamics are always known. The drift tubes shape study problem cannot be solved directly by ordinary methods because of unknown boundary conditions belongs to a class of ill-posed problem. At present, this problem can be solved by using genetic algorithms (GA). For this purpose, the electrode shape will be represent as the polynomial function, and then solve the Laplace equation with boundary conditions of Dirichlet and Neumann. The necessary electrodes shape can be quickly and easily simulated using the adaptive search.

WEPPC010	H-Cavity Based Accelerating Structure for Proton Accelerator	464
	M.V. Lalayan, A.A. Kalashnikova, S.E. Toporkov MEPhI, Moscow, Russia
	Funding: Work is supported by "scientific stuff" grant of The Ministry of Education and Science of the Russian Federation Cavity for proton accelerator operating in 0.01 to 0.04 phase velocity range optimization results with respect to electrodynamical parameters are presented. H-type based cavity for two operating frequencies 145 MHz and 433 MHz was considered. Influence of cavity shape and dimensions on most important EDCs – relative shunt impedance, quality factor and transient time factor was studied. Influence of high order modes on beam dynamics was considered.

WEPPC011	Modernisation of an Initial Part the MILAC Heavy Ion Linear Accelerator	466
	V.A. Bomko, A.P. Kobets, V.V. Panov, K.V. Pavlij, G.V. Sotnikov, B.V. Zajtsev NSC/KIPT, Kharkov, Ukraine
	New pre-stripping section (PSS-20) the MILAC heavy ion linear accelerator with the relation of their mass to charge A/q=20 is developed. That will allow to extend considerably a range accelerating ions and to increase intensity of beams. On an initial part of acceleration of ions from 6 keV/u up to 150 keV/u high capture in process of acceleration of the injected ions is provided interdigital (IH) accelerating structure with Radio-Frequency Quadrupole (RFQ) focusing. On the second part of acceleration of ions from 150 keV/u up to 1 MeV/u the highest rate of acceleration is created interdigital (IH) accelerating structure with drift tubes. Mathematical modeling geometrical and dynamic characteristics of accelerating structures pre-stripping section PSS-20 is executed. Dynamics of heavy ions in the course of acceleration is optimised.

WEPPC012	Progress in Booster Design in the NICA Project
	A.V. Butenko, A. Tuzikov JINR/VBLHEP, Moscow, Russia H.G. Khodzhibagiyan, I.N. Meshkov, V.A. Mikhailov, G.V. Trubnikov, A.S. Valkovich JINR, Dubna, Moscow Region, Russia
	In the framework of the NICA project the new Booster lattice is designing. The NICA layout includes Electron String Ion Source, 3 Mev/u linac, 600 MeV/u booster synchrotron, upgraded Nuclotron and ion collider. The main goals of the Booster are the following: accumulation of 2*E9 Au³²⁺ ions; acceleration of the heavy ions up to energy required for effective stripping; forming of the required beam emittance with electron cooling system. The present layout makes it possible to place the Booster having 211 m circumference and four fold symmetry lattice inside the yoke of the Synchrophasotron. The features of this booster, the requirement to the main synchrotron systems and their parameters are presented in this paper.

WEPPC013	Novel DTL Section for ITEP-TWAC Heavy Ion Injector	469
	V. Andreev, N.N. Alexeev, A. Kolomiets, V.A. Koshelev ITEP, Moscow, Russia A.S. Plastun MEPhI, Moscow, Russia
	A novel 81.5 MHz H-type drift tube (DTL) accelerating structure with rf quadrupoles following RFQ in the new injector I-4 for acceleration ions up to energy about 5 MeV/u for ITEP TWAC facility has been proposed. It is based on a combination of a DTL structure and the resonator with magnetic coupling windows. Computer simulations show that it can provide some advantages in comparison with conventional IH-DTL structure. Results of both electrodynamics and beam dynamics computer simulations of the structure as well as a new approach for beam matching RFQ and the section are presented.