RuPAC2014 - List of Keywords (linac)

Paper	Title	Other Keywords	Page
TUPSA04	Operating Frequency and Accelerating Structure Geometry Chose for the Travelling Wave Compact Electron Linear Accelerator	coupling, impedance, electron	42
	E.A. Savin, I.D. Sokolov MEPhI, Moscow, Russia
	For the compact electron linear accelerating structure based on the hybrid scheme which consists from SW biperiodic structure buncher and TW DLS with magnetic couple TW accelerating part, the best option for the operating frequency and cells geometry has been chosen. Comparative calculations for the DLS cells with magnetic couple and without it, on the different operating frequencies and with the different couple coefficient were carried out. The best option will be manufactured, measured and used in the accelerator structure.

TUPSA07	Transit Code for Beam Dynamic Simulation	simulation, rfq, ion, proton	51
	A.S. Plastun, A. Kolomiets, T. Tretyakova ITEP, Moscow, Russia
	Multiparticle computer code TRANSIT for simulation of intense ion beams in linacs and transport systems is presented. The code is based on experience in design of ion linacs in ITEP. TRANSIT summarizes the most actual and modern methods and algorithms for integration of motion equations including space charge forces. It is being used in ITEP for design and simulation of conventional RFQs, spatially periodic RF focusing linacs, beam transport systems, RF deflectors, etc. The paper presents general description of TRANSIT code and some achieved results.

TUPSA10	Advanced Optimization of an Low-energy Ion Beam Dynamics at Linac Front-end with RF Focusing	focusing, simulation, rfq, acceleration	57
	V.S. Dyubkov MEPhI, Moscow, Russia
	A design and development of a linac front-end, that guaranties the required beam, quality is an issue of the day. A linac with RF focusing by means of the accelerating field spatial harmonics is suggested as an alternative to RFQ system. Simulation results of the low-energy proton beam dynamics at linac, that takes into account main linac parameter optimization, based on advanced dynamical acceptance calculation, are presented and discussed.

TUPSA12	The User Friendly Interface for BEAMDULAC-RFQ Code	simulation, rfq, interface, space-charge	60
	S.M. Polozov, P.O. Larin MEPhI, Moscow, Russia
	The BEAMDULAC* beam dynamics simulation code is under development at MEPhI Department of Electrophysical Facilities since 1999. Such code includes versions for beam dynamics simulation in a number of accelerating structures as RFQ, DTL, APF, transport channels, ets. The motion equation for each particle is solved selfconsistently in the external fields and the inter-particle Coulomb field simultaneously. The BEAMDULAC code utilizes the cloud-in-cell (CIC) method for accurate treatment of the space charge effects. The external field can be represented analytically, as a series or on the grid. The absence of user friendly interface was the main disadvantage of the code. Last year such interface was developed and will present in the report. * S.M. Polozov. Problems of Atomic Science and Technology. Series: Nuclear Physics Investigations, 3 (79), 2012, p. 131-136.

TUPSA20	Output Energy Variation in the SC Linac for the Proton Radiotherapy	simulation, proton, cavity, focusing	80
	I.A. Ashanin, S.M. Polozov, A.V. Samoshin MEPhI, Moscow, Russia
	Current success of the superconducting linear accelerators based on independently phased SC cavities gives a seriously reason to consider such structure in proton radiotherapy. Superconductivity allow to solve at once some problems concerned with a low rate of energy gain, high length, higher capacity losses and higher cost of the proton linear accelerator subsequently. One of the traditional aims of such facilities is receiving of the beam energy about 240 MeV with possibility of fluently regulation in range from 150 to 240 MeV that responds to irradiate the tumors located at different depth. The possibility of beam energy variation by means of RF field phase in last resonators and number of the resonator turn-off becomes the major advantage of the proton SC linac. The optimal choice of accelerator parameters and the beam dynamics simulation results with using BEAMDULAC-SCL code will presented. Methods of the output energy variation with beam quality preservation in the proton SC linac will discussed. A.V. Samoshin. Proc. of LINAC2012, Tel-Aviv, Israel, TUPB069, p. 630 - 632

WEPSB01	Modernization the Modulator of the RF-Generator Ion Linear Accelerator LU-20	simulation, ion, operation, high-voltage	155
	V. Kobets, A. Govorov, V. Monchinsky JINR, Dubna, Moscow Region, Russia A.V. Butenko, D.E. Donets, A.O. Sidorin JINR/VBLHEP, Moscow, Russia
	The report discusses the replacement of the lamp key the modulator semiconductor. A schematic of the modulator and a semiconductor switch scheme protection against voltage surges in the generator lamp. Replacing the lamp key it possible to increase the output power generator.

WEPSB04	Field Optimization Technique of the Multigap H-mode Resonators	impedance, cavity, acceleration	162
	S.E. Toporkov, A.B. Buleiko, M.V. Lalayan MEPhI, Moscow, Russia
	Optimization of the H-mode resonators requires uniform accelerating field distribution on its axes. To realize this task pylons with the holes on its end walls are used in many cases. During applying this technique in case of cavities with low number of periods it was mentioned that the best value of the field flatness was obtained in case of zero gap between end walls of the resonator and the pylon. It means that each pylon has got the electrical contact with one of the end walls of the resonator. For such cavity geometry magnetic field distribution differs from the classical H – resonator: it transforms in one common magnetic flux like in split-coaxial cavities. The analysis of such structures was performed for two types of H-mode resonators: Cross bar H-mode (CH) resonators with working frequency 324MHz and Interdigital H-mode (IH) resonators with working frequency 162MHz. All types of resonators work on the pi-mode and have 9 accelerating gaps. The main stages of E-field flatness optimization inside CH⁻ and IH⁻ cavities are presented at this paper.

WEPSB35	Thermal Simulations of the Biperiodical Accelerating Structure with the Operating Frequency 27 GHz	simulation, coupling, electron, medical-accelerators	237
	Yu.D. Kliuchevskaia, S.M. Polozov MEPhI, Moscow, Russia
	Biperiodical accelerating structure (BAS) represents an accelerating structure based on disk loaded waveguide (DLW) with π/2 operation mode. The 1 cm band structure will have very compact transverse size. Such characteristics give it perspective to use in medical accelerators. The results of beam dynamics simulation and electrodynamics study was discussed early. It will important to study the BAS electrodynamics taking into account thermal processes in structure and to design the cooling system. It is important because of the high pulse RF power (about 1.5 MW) necessary for the beam acceleration. The simulation results which are defined using CST code will presented in report. Calculation and determination of the thermolysis coefficient depending on speed, temperature and the water flow direction will make.

WEPSB40	Design of a Linear Accelerator with a Magnetic Mirror on the Beam Energy of 45 MeV	klystron, electron, acceleration, gun	251
	V.I. Shvedunov, A.N. Ermakov, B.S. Ishkanov, A.N. Kamanin, V.V. Khankin, L.Yu. Ovchinnikova, N.I. Pakhomov, I.Yu. Vladimirov MSU, Moscow, Russia A.I. Karev, V.G. Raevsky LPI, Moscow, Russia I.V. Shvedunov, N.V. Shvedunov, D.S. Yurov MSU SINP, Moscow, Russia
	The results of calculation and optimization of pulsed linear accelerator with magnetic mirror on the beam energy, adjustable in the range of 20 - 45 MeV, designed for explosives detection and other applications are presented. The accelerator consists of an electron gun with an off-axis placed cathode with a beam hole on axis; of about 1.6 m long section of standing wave bi-periodic accelerating structure, operating at 2856 MHz, which is optimized to achieve the capture coefficient of more than 50% and of the energy spectrum width of about 2%; of a movable dispersion free magnetic mirror made with rare earth permanent magnet material. Accelerator provides acceleration of the beam with a pulse current of 100 mA to an energy of 45 MeV with RF power consumption less than 10 MW.

THX02	Experience in Research, Development, Construction and Commissioning of Normally Conducting Accelerating Structures	coupling, HOM, simulation, cavity	278
	V.V. Paramonov, L.V. Kravchuk RAS/INR, Moscow, Russia
	The experience and results of research, development, construction and start of normally conducting accelerating structures for high intensity hadron linear accelerators at medium and high energii is summarized Created methods and obtained results provided construction and start of operation of accelerating system in INR H⁻ linac with designed energy 600 MeV. The research results allow generalize the properties of high energy structures and develop methods and criteria for improvements, with were realized in the development and commissioning of accelerating structures in another foreign laboratories. Basing on research results, the high energy accelerating structure, which surpasses analogues in the total list of parameters, is proposed and approved.
	Slides THX02 [1.259 MB]

THCE01	INR RAS Linac Proton Injector 100 Hz PRR Operation Mode	operation, proton, high-voltage, simulation	306
	A. Belov, O.T. Frolov, L.P. Nechaeva, E.S. Nikulin, A.V. Turbabin, V. Zubets RAS/INR, Moscow, Russia
	The injector provides INR RAS linac by proton beam with energy 400 keV, 200 mks pulse duration at pulse repetition rate 50 Hz. PRR of the proton injector has been increased to 100 Hz with goal of rising the accelerator average beam current. Main stages and results of the injector modernization are presented.
	Slides THCE01 [3.518 MB]

THPSC01	Status of Linacs with High-frequency Quadrupole Focusing LU-30 and LU-30M in IHEP	rfq, proton, operation, DTL	312
	S.A. Strekalovskikh IHEP, Moscow Region, Russia
	There are two RFQ DT proton linacs, named the LU-30 and LU-30M, in the SRC IHEP of NRC "Kurchatov Institute" that are presently in operation. Both are the unique machines employing radio-frequency quadrupole focusing up to 30 MeV at exit. The LU-30 machine now runs as a proton injector to the booster RC PS U-1.5 that feeds the main PS U-70 ultimately. The LU-30M is now run in a stand-alone test operation mode. Such a parallel functioning of these two accelerators allows to use the LU-30M as an experimental facility enabling R&D on new technical decisions and upgrades for the ageing LU-30. On the other hand, the routine operation of the workhorse LU-30 allows for testing of the technical decisions proposed under a heavy non-stop operation during the U-70 runs for fixed-target physics.

THPSC03	Study of Superconducting Accelerating Structures for Megawatt Proton Driver Linac	cavity, simulation, accelerating-gradient, proton	318
	S.M. Polozov, K.A. Aliev, A.M. Fadeev, M. Gusarova, T. Kulevoy, M.V. Lalayan, N.P. Sobenin, O. Verjbitskiy MEPhI, Moscow, Russia
	Funding: This project was supported by the Ministry of Science and Education of Russia under contract No. 14.516.11.0084 The preliminary design of megawatt level proton accelerator-driver is carrying out by collaboration between Russian scientific centers MEPhI, ITEP, Kurchatov Institute. This project was supported in 2013 by the Ministry of Science and Education of Russia. The linac general layout includes SC Spoke-cavities at middle energy range and elliptical cavity at high energy one. The usage of QWR and/or HWR at 10-30 MeV was also discussed. Due to electrodynamics models of all structures types were designed and the electrodynamics characteristics were studied. QWR, HWQ and Spoke-cavities were proposed to operate on 324 MHz and elliptical cavities on 972 MHz. The main electrodynamics simulation results will present in report. The multipactor study results will also discussed.

THPSC04	Study of Normal Conducting Accelerating Structures for Megawatt Proton Driver Linac	rfq, cavity, Windows, coupling	321
	S.M. Polozov, A.E. Aksentyev, A.A. Kalashnikova, T. Kulevoy, M.V. Lalayan, S.E. Toporkov MEPhI, Moscow, Russia
	Funding: This project was supported by the Ministry of Science and Education of Russia under contract No. 14.516.11.0084 The preliminary design of megawatt level proton accelerator-driver is carrying out by collaboration between Russian scientific centers MEPhI, ITEP, Kurchatov Institute. This project was supported in 2013 by the Ministry of Science and Education of Russia. The linac general layout includes RFQ section and section(s) with radiofrequency focusing. The different types of RF focusing were studied due to this project: RF crossed lenses, modified electrodes RFQ, axi-symmetrical RF focusing. All such focusing can be realized by IH-type cavities. The design of segmented vane RFQ (SVRFQ) with coupling windows and IH⁻ and CH-type normal conducting cavities will discuss in the report. All cavities operate on 162 MHz. The main electrodynamics simulation results will present.

THPSC05	Study of Possibility of 600-1000 MeV and 1 MW Proton Driver Linac Development in Russia	focusing, rfq, simulation, proton	324
	S.M. Polozov, A.E. Aksentyev, K.A. Aliev, I.A. Ashanin, Y.A. Bashmakov, A.A. Blinnikov, T.V. Bondarenko, A.N. Didenko, M.S. Dmitriyev, V.V. Dmitriyeva, V.S. Dyubkov, A.M. Fadeev, A. Fertman, M. Gusarova, A.A. Kalashnikova, V.I. Kaminsky, E. Khabibullina, Yu.D. Kliuchevskaia, A.D. Kolyaskin, T. Kulevoy, M.V. Lalayan, S.V. Matsievskiy, V.I. Rashchikov, A.V. Samoshin, E.A. Savin, Ya.V. Shashkov, A.Yu. Smirnov, N.P. Sobenin, S.E. Toporkov, O. Verjbitskiy, A.V. Ziiatdinova, V. Zvyagintsev MEPhI, Moscow, Russia P.N. Alekseev, V.A. Nevinnitsa NRC, Moscow, Russia V.F. Batyaev, G. Kropachev, D.A. Liakin, S.V. Rogozhkin, Y.E. Titarenko ITEP, Moscow, Russia S. Stark INFN/LNL, Legnaro (PD), Italy
	Funding: This project was supported by the Ministry of Science and Education of Russia under contract No. 14.516.11.0084 Alternative nuclear energetic's technologies as fast reactors and accelerating driven systems (ADS) are necessary to solve a number of problems as U-238 or thorium fuel reactor and nuclear wastes transmutation. ADS subcritical system should consist of megawatt-power proton accelerator, neutron producing target and breeder. A number of ADS projects are under development in EU, Japan, USA, China, S.Korea at present. Superconducting linacs or their complexes with high energy storage synchrotron are under design in main projects as a megawatt power proton beam driver. In Russian Federation the complex design for accelerator-driver was carried down more than ten years ago. The new approach to the ADS complex is now under development in framework of the project carried out by collaboration between Russian scientific centers MEPhI, ITEP, Kurchatov Institute. This project was supported in 2013 by the Ministry of Science and Education of Russia. A brief results observation for accelerator part of the project is presented in report. It includes accelerator-driver general layout, beam dynamics simulation, electrodynamics simulations of accelerating cavities and analysis of technological background in Russia.

THPSC07	Single Frequency High Intensity High Energy Normal Conducting Hadron Linac	DTL, rfq, emittance, focusing	330
	V.V. Paramonov, V.N. Leontiev RAS/INR, Moscow, Russia A.P. Dourkine MNIRTI, Moscow, Russia A. Kolomiets ITEP, Moscow, Russia
	Funding: Work is supported by IHEP with contract № 0348100096313000178 Taking the care for beam quality and the possibility of practical realization, the scheme and parameters for 400 MeV H⁻ linac are considered. The concepts for beam emittance preservation, both transverse and longitudinal, starting from RFQ, following with PMQ focusing DTL and finishing with high energy CCL part are summarized. Different focusing schemes are analyzed for DTL and CCL parts. The pulse beam current is limited to the safe value 40 mA and the average current up to 2 mA is supposed by duty factor of 5%. The single operating frequency 352 MHz is for all linac parts, providing the strong unification both for RF system and elements of accelerating structures. Referring and comparing with existing solutions for another intense linacs, the feasibility and reality of the proposal is confirmed. Expected performances both in beam, parameters and hardware are summarized.

THPSC26	Distributed Beam Loss Monitor Based on the Cherenkov Effect in Optical Fiber	electron, radiation, positron, storage-ring	374
	Yu. Maltseva, F.E. Emanov, A.V. Petrenko, V.G. Prisekin BINP SB RAS, Novosibirsk, Russia F.E. Emanov NSU, Novosibirsk, Russia A.V. Petrenko CERN, Geneva, Switzerland
	A distributed beam loss monitor based on the Cherenkov effect in optical fiber has been implemented for the VEPP-5 electron and positron linacs and the 510 MeV damping ring at the Budker INP. The monitor operation is based on detection of the Cherenkov radiation generated in optical fiber by means of relativistic particles created in electromagnetic shower after highly relativistic beam particles (electrons or positrons) hit the vacuum pipe. The main advantage of the distributed monitor compared to local ones is that a long optical fiber section can be used instead of a large number of local beam loss monitors. In our experiments the Cherenkov light was detected by photomultiplier tube (PMT). Timing of PMT signal gives the location of the beam loss. In the experiment with 20 m long optical fiber we achieved 3 m spatial resolution. To improve spatial resolution optimization and selection process of optical fiber and PMT are needed and according to our theoretical estimations 0.5 m spatial resolution can be achieved. We also suggest similar techniques for detection of electron (or positron) losses due to Touschek effect in storage rings.

THPSC44	Development of Remote Control System for H-minus Ions Source of INR LINAC	ion, controls, ion-source, H-minus	423
	V.S. Klenov, Yu.V. Kiselev, O. Volodkevich, V. Zubets RAS/INR, Moscow, Russia
	A system of remote control of surface plasma source of negative ions for INR RAS LINAC was designed, constructed and put into operation. The INR LINAC negative ions injector is based on the accelerating tube at energy of 400 keV and surface plasma source of negative ions. Galvanic isolation and spatial separation of elements that are at potential 400 kV in the power rack of the ion source and the host computer are carried out by means of fiber-optic USB-interface extender from firms Icron. A set of multifunctional units from National Instruments allows to monitor the oscilloscope signals with up to 50 Ms/s and to control the ions source power settings. The data acquisition devices programming performed in a LabView graphical environment. Algorithm and LabVew code for fast and safe "conditioning" of the ion source discharge gap and extractor gap from arcing and breakdowns were developed.

FRCB02	Dynamics of Processes in Subcritical Reactor Driven by Linear Accelerator	neutron, controls, feedback, proton	467
	A.G. Golovkina, I.V. Kudinovich, D.A. Ovsyannikov St. Petersburg State University, St. Petersburg, Russia Y.A. Svistunov Saint Petersburg State University, Saint Petersburg, Russia
	Funding: St. Petersburg State University, grant No. 9.38.673.2013 In this paper dynamics of processes in accelerator driven system (ADS) is considered. ADS reactor operates at subcritical level and the necessary neutron supply comes from the interaction of a charged particles beam with a heavy atom nucleus (spallation reaction). Mathematical model of dynamics of subcritical reactor controlled by linear accelerator is presented. Calculation results of transient processes in the reactor core taking into account fuel feedback. The reactor power level control is carried out through the regulation of linac current impulses frequency.

Paper

Title

Other Keywords

Page

Operating Frequency and Accelerating Structure Geometry Chose for the Travelling Wave Compact Electron Linear Accelerator

coupling, impedance, electron

42

E.A. Savin, I.D. Sokolov
MEPhI, Moscow, Russia

For the compact electron linear accelerating structure based on the hybrid scheme which consists from SW biperiodic structure buncher and TW DLS with magnetic couple TW accelerating part, the best option for the operating frequency and cells geometry has been chosen. Comparative calculations for the DLS cells with magnetic couple and without it, on the different operating frequencies and with the different couple coefficient were carried out. The best option will be manufactured, measured and used in the accelerator structure.

TUPSA07

Transit Code for Beam Dynamic Simulation

simulation, rfq, ion, proton

51

A.S. Plastun, A. Kolomiets, T. Tretyakova
ITEP, Moscow, Russia

Multiparticle computer code TRANSIT for simulation of intense ion beams in linacs and transport systems is presented. The code is based on experience in design of ion linacs in ITEP. TRANSIT summarizes the most actual and modern methods and algorithms for integration of motion equations including space charge forces. It is being used in ITEP for design and simulation of conventional RFQs, spatially periodic RF focusing linacs, beam transport systems, RF deflectors, etc. The paper presents general description of TRANSIT code and some achieved results.

TUPSA10

Advanced Optimization of an Low-energy Ion Beam Dynamics at Linac Front-end with RF Focusing

focusing, simulation, rfq, acceleration

57

V.S. Dyubkov
MEPhI, Moscow, Russia

A design and development of a linac front-end, that guaranties the required beam, quality is an issue of the day. A linac with RF focusing by means of the accelerating field spatial harmonics is suggested as an alternative to RFQ system. Simulation results of the low-energy proton beam dynamics at linac, that takes into account main linac parameter optimization, based on advanced dynamical acceptance calculation, are presented and discussed.

TUPSA12

The User Friendly Interface for BEAMDULAC-RFQ Code

simulation, rfq, interface, space-charge

60

S.M. Polozov, P.O. Larin
MEPhI, Moscow, Russia

The BEAMDULAC* beam dynamics simulation code is under development at MEPhI Department of Electrophysical Facilities since 1999. Such code includes versions for beam dynamics simulation in a number of accelerating structures as RFQ, DTL, APF, transport channels, ets. The motion equation for each particle is solved selfconsistently in the external fields and the inter-particle Coulomb field simultaneously. The BEAMDULAC code utilizes the cloud-in-cell (CIC) method for accurate treatment of the space charge effects. The external field can be represented analytically, as a series or on the grid. The absence of user friendly interface was the main disadvantage of the code. Last year such interface was developed and will present in the report.
* S.M. Polozov. Problems of Atomic Science and Technology. Series: Nuclear Physics Investigations, 3 (79), 2012, p. 131-136.

TUPSA20

Output Energy Variation in the SC Linac for the Proton Radiotherapy

simulation, proton, cavity, focusing

80

I.A. Ashanin, S.M. Polozov, A.V. Samoshin
MEPhI, Moscow, Russia

Current success of the superconducting linear accelerators based on independently phased SC cavities gives a seriously reason to consider such structure in proton radiotherapy. Superconductivity allow to solve at once some problems concerned with a low rate of energy gain, high length, higher capacity losses and higher cost of the proton linear accelerator subsequently. One of the traditional aims of such facilities is receiving of the beam energy about 240 MeV with possibility of fluently regulation in range from 150 to 240 MeV that responds to irradiate the tumors located at different depth. The possibility of beam energy variation by means of RF field phase in last resonators and number of the resonator turn-off becomes the major advantage of the proton SC linac. The optimal choice of accelerator parameters and the beam dynamics simulation results with using BEAMDULAC-SCL code will presented*. Methods of the output energy variation with beam quality preservation in the proton SC linac will discussed.
* A.V. Samoshin. Proc. of LINAC2012, Tel-Aviv, Israel, TUPB069, p. 630 - 632

WEPSB01

Modernization the Modulator of the RF-Generator Ion Linear Accelerator LU-20

simulation, ion, operation, high-voltage

155

V. Kobets, A. Govorov, V. Monchinsky
JINR, Dubna, Moscow Region, Russia
A.V. Butenko, D.E. Donets, A.O. Sidorin
JINR/VBLHEP, Moscow, Russia

The report discusses the replacement of the lamp key the modulator semiconductor. A schematic of the modulator and a semiconductor switch scheme protection against voltage surges in the generator lamp. Replacing the lamp key it possible to increase the output power generator.

WEPSB04

Field Optimization Technique of the Multigap H-mode Resonators

impedance, cavity, acceleration

162

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

Optimization of the H-mode resonators requires uniform accelerating field distribution on its axes. To realize this task pylons with the holes on its end walls are used in many cases. During applying this technique in case of cavities with low number of periods it was mentioned that the best value of the field flatness was obtained in case of zero gap between end walls of the resonator and the pylon. It means that each pylon has got the electrical contact with one of the end walls of the resonator. For such cavity geometry magnetic field distribution differs from the classical H – resonator: it transforms in one common magnetic flux like in split-coaxial cavities. The analysis of such structures was performed for two types of H-mode resonators: Cross bar H-mode (CH) resonators with working frequency 324MHz and Interdigital H-mode (IH) resonators with working frequency 162MHz. All types of resonators work on the pi-mode and have 9 accelerating gaps. The main stages of E-field flatness optimization inside CH⁻ and IH⁻ cavities are presented at this paper.

WEPSB35

Thermal Simulations of the Biperiodical Accelerating Structure with the Operating Frequency 27 GHz

simulation, coupling, electron, medical-accelerators

237

Yu.D. Kliuchevskaia, S.M. Polozov
MEPhI, Moscow, Russia

Biperiodical accelerating structure (BAS) represents an accelerating structure based on disk loaded waveguide (DLW) with π/2 operation mode. The 1 cm band structure will have very compact transverse size. Such characteristics give it perspective to use in medical accelerators. The results of beam dynamics simulation and electrodynamics study was discussed early. It will important to study the BAS electrodynamics taking into account thermal processes in structure and to design the cooling system. It is important because of the high pulse RF power (about 1.5 MW) necessary for the beam acceleration. The simulation results which are defined using CST code will presented in report. Calculation and determination of the thermolysis coefficient depending on speed, temperature and the water flow direction will make.

WEPSB40

Design of a Linear Accelerator with a Magnetic Mirror on the Beam Energy of 45 MeV

klystron, electron, acceleration, gun

251

V.I. Shvedunov, A.N. Ermakov, B.S. Ishkanov, A.N. Kamanin, V.V. Khankin, L.Yu. Ovchinnikova, N.I. Pakhomov, I.Yu. Vladimirov
MSU, Moscow, Russia
A.I. Karev, V.G. Raevsky
LPI, Moscow, Russia
I.V. Shvedunov, N.V. Shvedunov, D.S. Yurov
MSU SINP, Moscow, Russia

The results of calculation and optimization of pulsed linear accelerator with magnetic mirror on the beam energy, adjustable in the range of 20 - 45 MeV, designed for explosives detection and other applications are presented. The accelerator consists of an electron gun with an off-axis placed cathode with a beam hole on axis; of about 1.6 m long section of standing wave bi-periodic accelerating structure, operating at 2856 MHz, which is optimized to achieve the capture coefficient of more than 50% and of the energy spectrum width of about 2%; of a movable dispersion free magnetic mirror made with rare earth permanent magnet material. Accelerator provides acceleration of the beam with a pulse current of 100 mA to an energy of 45 MeV with RF power consumption less than 10 MW.

THX02

Experience in Research, Development, Construction and Commissioning of Normally Conducting Accelerating Structures

coupling, HOM, simulation, cavity

278

V.V. Paramonov, L.V. Kravchuk
RAS/INR, Moscow, Russia

The experience and results of research, development, construction and start of normally conducting accelerating structures for high intensity hadron linear accelerators at medium and high energii is summarized Created methods and obtained results provided construction and start of operation of accelerating system in INR H⁻ linac with designed energy 600 MeV. The research results allow generalize the properties of high energy structures and develop methods and criteria for improvements, with were realized in the development and commissioning of accelerating structures in another foreign laboratories. Basing on research results, the high energy accelerating structure, which surpasses analogues in the total list of parameters, is proposed and approved.

Slides THX02 [1.259 MB]

THCE01

INR RAS Linac Proton Injector 100 Hz PRR Operation Mode

operation, proton, high-voltage, simulation

306

A. Belov, O.T. Frolov, L.P. Nechaeva, E.S. Nikulin, A.V. Turbabin, V. Zubets
RAS/INR, Moscow, Russia

The injector provides INR RAS linac by proton beam with energy 400 keV, 200 mks pulse duration at pulse repetition rate 50 Hz. PRR of the proton injector has been increased to 100 Hz with goal of rising the accelerator average beam current. Main stages and results of the injector modernization are presented.

Slides THCE01 [3.518 MB]

THPSC01

Status of Linacs with High-frequency Quadrupole Focusing LU-30 and LU-30M in IHEP

rfq, proton, operation, DTL

312

S.A. Strekalovskikh
IHEP, Moscow Region, Russia

There are two RFQ DT proton linacs, named the LU-30 and LU-30M, in the SRC IHEP of NRC "Kurchatov Institute" that are presently in operation. Both are the unique machines employing radio-frequency quadrupole focusing up to 30 MeV at exit. The LU-30 machine now runs as a proton injector to the booster RC PS U-1.5 that feeds the main PS U-70 ultimately. The LU-30M is now run in a stand-alone test operation mode. Such a parallel functioning of these two accelerators allows to use the LU-30M as an experimental facility enabling R&D on new technical decisions and upgrades for the ageing LU-30. On the other hand, the routine operation of the workhorse LU-30 allows for testing of the technical decisions proposed under a heavy non-stop operation during the U-70 runs for fixed-target physics.

THPSC03

Study of Superconducting Accelerating Structures for Megawatt Proton Driver Linac

cavity, simulation, accelerating-gradient, proton

318

S.M. Polozov, K.A. Aliev, A.M. Fadeev, M. Gusarova, T. Kulevoy, M.V. Lalayan, N.P. Sobenin, O. Verjbitskiy
MEPhI, Moscow, Russia

Funding: This project was supported by the Ministry of Science and Education of Russia under contract No. 14.516.11.0084
The preliminary design of megawatt level proton accelerator-driver is carrying out by collaboration between Russian scientific centers MEPhI, ITEP, Kurchatov Institute. This project was supported in 2013 by the Ministry of Science and Education of Russia. The linac general layout includes SC Spoke-cavities at middle energy range and elliptical cavity at high energy one. The usage of QWR and/or HWR at 10-30 MeV was also discussed. Due to electrodynamics models of all structures types were designed and the electrodynamics characteristics were studied. QWR, HWQ and Spoke-cavities were proposed to operate on 324 MHz and elliptical cavities on 972 MHz. The main electrodynamics simulation results will present in report. The multipactor study results will also discussed.

THPSC04

Study of Normal Conducting Accelerating Structures for Megawatt Proton Driver Linac

rfq, cavity, Windows, coupling

321

S.M. Polozov, A.E. Aksentyev, A.A. Kalashnikova, T. Kulevoy, M.V. Lalayan, S.E. Toporkov
MEPhI, Moscow, Russia

Funding: This project was supported by the Ministry of Science and Education of Russia under contract No. 14.516.11.0084
The preliminary design of megawatt level proton accelerator-driver is carrying out by collaboration between Russian scientific centers MEPhI, ITEP, Kurchatov Institute. This project was supported in 2013 by the Ministry of Science and Education of Russia. The linac general layout includes RFQ section and section(s) with radiofrequency focusing. The different types of RF focusing were studied due to this project: RF crossed lenses, modified electrodes RFQ, axi-symmetrical RF focusing. All such focusing can be realized by IH-type cavities. The design of segmented vane RFQ (SVRFQ) with coupling windows and IH⁻ and CH-type normal conducting cavities will discuss in the report. All cavities operate on 162 MHz. The main electrodynamics simulation results will present.

THPSC05

Study of Possibility of 600-1000 MeV and 1 MW Proton Driver Linac Development in Russia

focusing, rfq, simulation, proton

324

S.M. Polozov, A.E. Aksentyev, K.A. Aliev, I.A. Ashanin, Y.A. Bashmakov, A.A. Blinnikov, T.V. Bondarenko, A.N. Didenko, M.S. Dmitriyev, V.V. Dmitriyeva, V.S. Dyubkov, A.M. Fadeev, A. Fertman, M. Gusarova, A.A. Kalashnikova, V.I. Kaminsky, E. Khabibullina, Yu.D. Kliuchevskaia, A.D. Kolyaskin, T. Kulevoy, M.V. Lalayan, S.V. Matsievskiy, V.I. Rashchikov, A.V. Samoshin, E.A. Savin, Ya.V. Shashkov, A.Yu. Smirnov, N.P. Sobenin, S.E. Toporkov, O. Verjbitskiy, A.V. Ziiatdinova, V. Zvyagintsev
MEPhI, Moscow, Russia
P.N. Alekseev, V.A. Nevinnitsa
NRC, Moscow, Russia
V.F. Batyaev, G. Kropachev, D.A. Liakin, S.V. Rogozhkin, Y.E. Titarenko
ITEP, Moscow, Russia
S. Stark
INFN/LNL, Legnaro (PD), Italy

Funding: This project was supported by the Ministry of Science and Education of Russia under contract No. 14.516.11.0084
Alternative nuclear energetic's technologies as fast reactors and accelerating driven systems (ADS) are necessary to solve a number of problems as U-238 or thorium fuel reactor and nuclear wastes transmutation. ADS subcritical system should consist of megawatt-power proton accelerator, neutron producing target and breeder. A number of ADS projects are under development in EU, Japan, USA, China, S.Korea at present. Superconducting linacs or their complexes with high energy storage synchrotron are under design in main projects as a megawatt power proton beam driver. In Russian Federation the complex design for accelerator-driver was carried down more than ten years ago. The new approach to the ADS complex is now under development in framework of the project carried out by collaboration between Russian scientific centers MEPhI, ITEP, Kurchatov Institute. This project was supported in 2013 by the Ministry of Science and Education of Russia. A brief results observation for accelerator part of the project is presented in report. It includes accelerator-driver general layout, beam dynamics simulation, electrodynamics simulations of accelerating cavities and analysis of technological background in Russia.

THPSC07

Single Frequency High Intensity High Energy Normal Conducting Hadron Linac

DTL, rfq, emittance, focusing

330

V.V. Paramonov, V.N. Leontiev
RAS/INR, Moscow, Russia
A.P. Dourkine
MNIRTI, Moscow, Russia
A. Kolomiets
ITEP, Moscow, Russia

Funding: Work is supported by IHEP with contract № 0348100096313000178
Taking the care for beam quality and the possibility of practical realization, the scheme and parameters for 400 MeV H⁻ linac are considered. The concepts for beam emittance preservation, both transverse and longitudinal, starting from RFQ, following with PMQ focusing DTL and finishing with high energy CCL part are summarized. Different focusing schemes are analyzed for DTL and CCL parts. The pulse beam current is limited to the safe value 40 mA and the average current up to 2 mA is supposed by duty factor of 5%. The single operating frequency 352 MHz is for all linac parts, providing the strong unification both for RF system and elements of accelerating structures. Referring and comparing with existing solutions for another intense linacs, the feasibility and reality of the proposal is confirmed. Expected performances both in beam, parameters and hardware are summarized.

THPSC26

Distributed Beam Loss Monitor Based on the Cherenkov Effect in Optical Fiber

electron, radiation, positron, storage-ring

374

Yu. Maltseva, F.E. Emanov, A.V. Petrenko, V.G. Prisekin
BINP SB RAS, Novosibirsk, Russia
F.E. Emanov
NSU, Novosibirsk, Russia
A.V. Petrenko
CERN, Geneva, Switzerland

A distributed beam loss monitor based on the Cherenkov effect in optical fiber has been implemented for the VEPP-5 electron and positron linacs and the 510 MeV damping ring at the Budker INP. The monitor operation is based on detection of the Cherenkov radiation generated in optical fiber by means of relativistic particles created in electromagnetic shower after highly relativistic beam particles (electrons or positrons) hit the vacuum pipe. The main advantage of the distributed monitor compared to local ones is that a long optical fiber section can be used instead of a large number of local beam loss monitors. In our experiments the Cherenkov light was detected by photomultiplier tube (PMT). Timing of PMT signal gives the location of the beam loss. In the experiment with 20 m long optical fiber we achieved 3 m spatial resolution. To improve spatial resolution optimization and selection process of optical fiber and PMT are needed and according to our theoretical estimations 0.5 m spatial resolution can be achieved. We also suggest similar techniques for detection of electron (or positron) losses due to Touschek effect in storage rings.

THPSC44

Development of Remote Control System for H-minus Ions Source of INR LINAC

ion, controls, ion-source, H-minus

423

V.S. Klenov, Yu.V. Kiselev, O. Volodkevich, V. Zubets
RAS/INR, Moscow, Russia

A system of remote control of surface plasma source of negative ions for INR RAS LINAC was designed, constructed and put into operation. The INR LINAC negative ions injector is based on the accelerating tube at energy of 400 keV and surface plasma source of negative ions. Galvanic isolation and spatial separation of elements that are at potential 400 kV in the power rack of the ion source and the host computer are carried out by means of fiber-optic USB-interface extender from firms Icron. A set of multifunctional units from National Instruments allows to monitor the oscilloscope signals with up to 50 Ms/s and to control the ions source power settings. The data acquisition devices programming performed in a LabView graphical environment. Algorithm and LabVew code for fast and safe "conditioning" of the ion source discharge gap and extractor gap from arcing and breakdowns were developed.

FRCB02

Dynamics of Processes in Subcritical Reactor Driven by Linear Accelerator

neutron, controls, feedback, proton

467

A.G. Golovkina, I.V. Kudinovich, D.A. Ovsyannikov
St. Petersburg State University, St. Petersburg, Russia
Y.A. Svistunov
Saint Petersburg State University, Saint Petersburg, Russia

Funding: St. Petersburg State University, grant No. 9.38.673.2013
In this paper dynamics of processes in accelerator driven system (ADS) is considered. ADS reactor operates at subcritical level and the necessary neutron supply comes from the interaction of a charged particles beam with a heavy atom nucleus (spallation reaction). Mathematical model of dynamics of subcritical reactor controlled by linear accelerator is presented. Calculation results of transient processes in the reactor core taking into account fuel feedback. The reactor power level control is carried out through the regulation of linac current impulses frequency.