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quadrupole

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TUPSA004 Superconducting Magnets for the NICA Accelerator Complex in Dubna collider, dipole, booster, synchrotron 41
 
  • E. V. Muravieva, H. G. Khodzhibagiyan, V. A. Mikhailov
    JINR, Dubna, Moscow Region
  The Nuclotron-based Ion Collider Facility (NICA) is the new accelerator complex being constructed at JINR aimed to provide collider experiments with heave ions and polarized deuterons. It includes new linac, Booster, upgraded superconducting (SC) synchrotron Nuclotron and Collider consisting of two storage rings. The NICA Booster dipole and quadrupole magnets are based on the Nuclotron type magnet with "cold" iron yoke and winding of hollow superconductor. This paper presents the basic characteristics, describes the design and status of manufacturing of the NICA Booster dipole and quadrupole full size model magnets.  
 
TUPSA019 Power Supply and Protection System of the Nuclotron Booster in the NICA Project power-supply, booster, dipole, superconducting-magnet 83
 
  • A. V. Kudashkin
    JINR/VBLHEP, Moscow
  The Nuclotron Booster in NICA project is aimed to accelerate heavy ions up to 600 MeV/u to provide effective stripping before injection into the Nuclotron. The Booster power supply system consists of one powerful unit, providing maximum current of 12 kA and field ramp up to 1 T/s, and two additional units, that are used for the ring working point adjustment. The quench protection system is based on thyristor keys. Structure and parameters of the power sypply system is presented.  
 
WEPSB009 Acceleration of Heavy Ions in Space Periodic Quadrupole RF Focusing Structure rfq, acceleration, focusing, ion 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.  
 
WEPSB012 Method to Estimate the Beam and Structure Parameters for the Dispersion Accelerator Parts emittance, linac, coupling, lattice 193
 
  • V. A. Moiseev
    RAS/INR, Moscow
  The beam dynamics parameters as the transverse emittance information, momentum spread and structure characteristics are determined by treatment of the small number of profile measurements for the dispersion accelerator parts. The reliability of measurements is estimated.  
 
WEPSB013 Reconstruction of the Beam Parameters and Structure Characteristics for INR Isotope Channel linac, target, emittance, proton 196
 
  • V. A. Moiseev, S. Bragin, A. Feschenko, O. V. Grekhov, Yu. V. Kiselev, A. N. Mirzojan, O. Volodkevich
    RAS/INR, Moscow
  The various treatments of profile measurements have been applied to estimate both the major beam parameters and structure functions for the INR isotope channel. The main problem for beam dynamics reconstruction consists in the presence of the dispersion function along the beam line studied. The reliable results were obtained and used to form the beam on the target of INR isotope complex.  
 
WEPSB014 Examination of Charged Particle Dynamics Through Employment of the Fourier Series focusing, undulator, lattice, betatron 199
 
  • O. E. Shishanin
    MSIU, Moscow
  In some papers we have considered an influence of the betatron oscillations on synchrotron radiation properties. To obtain uninterrupted solution for the Hill equation, in this case the transverse components of magnetic field were expanded in a Fourier series. This approach was usefully employed and posed problem was resolved in focusing periodic magnetic fields. Using this scheme, the equations of oscillations were also derived for storage rings. It was published in Proceedings of RuPAC2008. The procedure may even work for the various types of wigglers and undulators where the dynamics of particles can be described more precisely with regard to the concrete field inside a single magnet and their arrangement as a whole.  
 
WEPSB022 Nonlinear Electron Beam Dynamics with Large Energy Spread in the Magnetic Mirror electron, linac, dipole, sextupole 212
 
  • Y. A. Fomin, V. Korchuganov
    RRC, Moscow
  One of the features of new injection system for Kurchatov source of synchrotron radiation is an energy doubling of electron beam in forinjector – linear accelerator. The magnetic mirror provides 180° turn of electron beam into acceleration structure of linac for twice beam energy increase. This paper describes linear and nonlinear electron beam dynamics with energy 80 MeV and large energy spread in the magnetic mirror. The theoretical first- and second order optical functions of the magnetic mirror and the results of computer simulation of electron beam trajectories taking into account large energy spread and curvature of trajectories are presented. The structure of the magnetic mirror providing the achromatic and isochronous 180° turn of electron beam with 7% energy spread is suggested. Mutual influence of “the head” and “the tail” of electron beam when colliding in a straight section spaced in between linac output and magnetic mirror on particle losses and on the longitudinal and transversal parameters are considered.  
 
WEPSB039 Upgrade of the U-70 Proton Synchrotron Extracted Beam Lines Control System: Multiple Access and Data Presentation controls, synchrotron, proton, feedback 260
 
  • V. Alferov, Y. Bordanovsky, V. Lagutin, I. Lobov, A. Lutchev
    IHEP Protvino, Protvino, Moscow Region
  Equipment under control consists of about 130 Magnet dipoles and quadrupoles, with power provided by 112 power supplies (PS). Each PS is controlled by an individual AD based controller; since a number of used magnets is not stable and exceeds the number of available PSs, commutation is used. Controllers are connected to a front-end computer by means of four CAN field buses. The software for these controllers is tuned to a specific type of the PS and a specific inductive load of the magnet. The server Dell PowerEdge T710 is used for PS control with multiply access from several client workstations which controls PSs for particular Beam Line. All client workstations along with server and front-end computer are connected together using a dedicated LAN. The server grants different users a different permissions to control their "own" PSs only. All measured data are stored into an archive, the archiving step is about 4 seconds. The operating commands are stored into the archive too, this feature gives a helpful possibility to reveal all users actions in case of measurement misunderstanding. The software is based on NI Developer Suit Core and MS Office Web Components packages.  
 
THCHC01 Development and Production of Superconducting and Cryogenic Equipment and Systems for Accelerators by IHEP cryogenics, dipole, electron, vacuum 295
 
  • S. Kozub, A. I. Ageev, I. Bogdanov, E. Kashtanov, A. P. Orlov, V. A. Pokrovsky, P. A. Shcherbakov, L. S. Shirshov, I. Slabodchikov, V. Sytnik, L. Tkachenko, S. Zinchenko, V. Zubko
    IHEP Protvino, Protvino, Moscow Region
  Superconducting and cryogenic programs at IHEP were got a powerful upsurge in the early eighties of the last century within the framework of the UNK project. More than hundred model superconducting magnets and the pilot batch of UNK superconducting dipoles and quadrupoles were produced and tested with the help of cryogenic test facilities built for this purpose. Cooperation with international scientific accelerator centers was developed in last ten years. Two superconducting magnetic systems of Electron Lens for the Tevatron accelerator (USA) were developed, manufactured and successfully brought into operation. 42 cryogenic electrical feed boxes of various types for Large Hadron Collider (Switzerland) were developed, produced and put into commission. Results of the development of fast-cycling superconducting magnets for the FAIR project (European Research Centre of Ions and Antiprotons, Germany) are discussed. Description of the largest in Russia cryogenic system for cooling with superfluid helium of superconducting RF separator for the new beam channel of the U-70 accelerator (Russia) is presented.  
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THCHC02 Development of Fast-Cycling Superconducting Quadrupole and Corrector Magnets for the SIS 300 multipole, sextupole, dipole, resonance 300
 
  • L. Tkachenko, I. Bogdanov, S. Kozub, P. A. Shcherbakov, I. Slabodchikov, V. Sytnik, V. Zubko
    IHEP Protvino, Protvino, Moscow Region
  Funding: Rosatom, contract Н.4е.45.03.10.1027

IHEP participates in the development of superconducting fast-cycling magnets for the FAIR project. In the frame of this project IHEP has developed a prototype of the main quadrupole, assigned for using in the SIS300 ring. The main parameters of the quadrupole are: 45-T/m central gradient in 125-mm ID of the coil with the useful aperture of 105 mm; the gradient ramp rate is 10 T/m/c and the length of the prototype is 1 m. The main characteristics of the designed quadrupole magnet are discussed here. The correction system consists of multipole magnets, resonance and chromaticity sextupoles and steering dipoles. The multipole magnet contains octupole, sextupole and quadrupole coils and the steering magnet involves horizontal and vertical dipoles. Geometries of corrector and steering magnets are presented as well as their main magnetic parameters.

 
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THCHC03 Cooling System of the SIS300 Accelerator dipole, cryogenics, multipole, superconducting-magnet 303
 
  • S. Zinchenko, A. I. Ageev, S. Kozub, V. Zubko
    IHEP Protvino, Protvino, Moscow Region
  The Facility for Antiprotons and Ion Research (FAIR) being under construction in Germany as an international project is a cascade of accelerators; two last accelerators from this cascade will be made with the use of superconducting magnets. The large volume of the executed work on the SIS300 superconductive equipment allowed to start the estimation of the basic parameters of SIS300 cooling system. On the base of many research notes and calculations the item-by-item heat load budget at the helium temperature level is composed. Cooling system flow diagram is proposed, the calculated single phase helium temperature profiles along the string of magnets are presented and discussed. Helium flow pressure drop along the string of magnets during cooling down is calculated on the basis of "temperature wave" model and cooling down time of the accelerator is estimated.  
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THPSC005 Materials for Fast Cycling Accelerator Superconducting Magnets dipole, vacuum, insertion, superconducting-magnet 331
 
  • P. A. Shcherbakov, I. Bogdanov, S. Kozub, L. S. Shirshov, I. Slabodchikov, V. Sytnik, L. Tkachenko, V. Zubko
    IHEP Protvino, Protvino, Moscow Region
  Funding: Rosatom, contract Í.4å.45.03.10.1027

Development of fast-cycling superconducting magnets with high field amplitudes and ramp rate makes severe requirements especially to material properties in order to improve field quality and to reduce AC losses. Analysis of experimental and literature data is fulfilled for magnetic characteristics of electric steels at different temperatures. Susceptibilities of stainless steels of different grades are examined as well as a tolerance on the value of the magnetic permeability. Mechanical, thermophysical and technological properties at room and cryogenic temperatures are presented. Comparison of steel characteristics, selected for the SIS300 quadrupole prototype, with the steels, used in the SIS300 dipole and steels, applied in the SIS100 prototype magnets is carried out. General advices to the choice of materials for electrical and stainless steels, used in a design of fast-cycling magnets, are given.

 
 
THPSC006 Test Facility for SIS300 Cryomodules cryogenics, vacuum, controls, superconducting-magnet 334
 
  • A. Vlasov, A. I. Ageev, E. Kashtanov, А. Khartchenko, S. Kozub, S. Zinchenko
    IHEP Protvino, Protvino, Moscow Region
  Within the framework of participation in FAIR project IHEP develops the fast-cycling superconducting quadrupole and corrector magnets for SIS300 accelerator. These magnets in the specific combinations will be united into the so called cryomodules having common cryostat. The facility for testing these cryomodules in the forced flow cooling mode, where it is intended to carry out the complex of electrical, magnetic and thermophysical tests, is examined. The facility is based on the existing helium compression and purification equipment, helium refrigerator and research cryostats. A satellite refrigerator is added to the cryogenic system, which also works as the helium mass flow rate multiplier.  
 
THPSC007 Study of Electrodynamic and Thermodynamic Mechanisms Influencing Stability of Superconducting Rutherford Cable simulation, synchrotron, injection, superconducting-magnet 337
 
  • V. Zubko, I. Bogdanov, S. Kozub, P. A. Shcherbakov, L. S. Shirshov, L. Tkachenko
    IHEP Protvino, Protvino, Moscow Region
  Stability for superconducting fast-cycling dipoles and quadrupoles plays an important role. A feature of a complex network of strands and strand-to-strand contacts, current distribution in the network have to be taken into account for superconducting cables. The coupled numerical simulation of electromagnetic and thermal processes in Rutherford superconducting cables during the initiation of a quench was carried out. The network model has been combined with thermal analysis, which allows one to model quench dynamics, including the effects of a current redistribution in strands, discontinuities and inhomogeneity, the initial heating in strand, and, as a result, occasional quench recovery or runaway quench propagations. A computer simulation has been made for study of dependence of the minimum quench energy on ratio operating/critical currents for cables with and without core.  
 
THPSC009 Experimental Study of Characteristics of Cable for Fast-Cycling Superconducting Magnets superconducting-magnet, controls, magnet-design 343
 
  • I. Bogdanov, E. Kashtanov, S. Kozub, P. A. Shcherbakov, L. S. Shirshov, I. Slabodchikov, L. Tkachenko, V. Zubko
    IHEP Protvino, Protvino, Moscow Region
  Funding: Russian Foundation for Basic Research. Project no. 09-08-00528.

Fast-cycling magnetic fields, produced by superconducting magnets of the SIS300 accelerator, generate cable losses, which should be reduced by increase of contact resistances between wires in the cable. For this purpose various methods of cable interstrand resistance increasing are used successfully. But the values of contact resistances have strong influence on a stability, which could be characterized by minimum quench energy (MQE). From this point of view at IHEP it was carried out the experimental study of Rutherford type 19-strand superconducting cable with high value of contact resistances. Contact resistances and MQE measurements were performed. The description of features of samples, the measurement scheme and procedure are presented along with the experimental results.

 
 
THPSC035 Compromise Systems for Transport Proton and Ion Beams in Medical Aims ion, proton, target, beam-transport 390
 
  • M. M. Kats
    ITEP, Moscow
  Traditional GANTRY is not suitable for future centers of therapy by proton or ion beams by reasons of its enormous size, rotation with precision of significant mass, huge electricity consumption and extremely high cost. Review of various compromise solutions for beam transport to a patient is presented in the report: horizontal beam, rotation of patient around the vertical axis, beams with fixated directions, beams with fixated directions and with additional patient rotation around the horizontal axis (with the use of tomography and with additional adjustment after each rotation) and planar systems in different versions. It was shown that planar systems are the most promising solution at the present moment.  
 
THPSC038 Tuning of the INR Therapeutic Proton Beam proton, scattering, vacuum, focusing 396
 
  • M. I. Grachev, S. V. Akulinichev, Y. K. Gavrilov, E. V. Ponomareva, V. N. Vasiliev
    RAS/INR, Moscow
  • V. N. Zapolsky
    IHEP Protvino, Protvino, Moscow Region
  The scheme of formation of a therapeutic proton beam of the INR RAS Experimental Complex is described. Parameters of a beam and results of measurement of the absorbed doses by the analyser Wellhofer WP600 are presented.