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synchrotron

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TUCHZ01 Accelerator Complex U70 of IHEP: Present Status and Recent Upgrades extraction, proton, feedback, ion 27
 
  • S. V. Ivanov
    IHEP Protvino, Protvino, Moscow Region
  The report* overviews status of the U70, accelerator complex 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-2008.

* On behalf of the U70 staff

 
 
TUPSA004 Superconducting Magnets for the NICA Accelerator Complex in Dubna collider, dipole, booster, quadrupole 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.  
 
TUPSA012 TBA Scheme with Ion/Proton Driving Beam proton, ion, electron, positron 62
 
  • A. A. Mikhailichenko
    CLASSE, Ithaca, New York
  • E. G. Bessonov
    LPI, Moscow
  We are considering a Two Beam Accelerator scheme for electron-positron collisions with Ion/Proton driving beam. We compare the proposed scheme and the CLIC one coming to conclusion, that Ion/Proton driving TBA scheme looks more attractive. Existences of big proton accelerators in few laboratories give a new boost to reconsider the baseline for post LHC era. These labs are FERMILAB, BNL, CERN and IHEP at Protvino, Moscow region. Protvino could emerge as one advantageous place for resurrection of proton synchrotron in existing ~20-km long tunnel. This synchrotron was planned as a booster for 2x2 TeV UNK complex.

* K. Hubner, CERN/PS 92-43(DI), CLIC Note No.176,1992.
** E. A. Perevedentsev, A. N. Skrinsky, Preprint BINP 79-80, Novosibirsk, 1979.

 
 
TUPSA017 Project of JINR Superconducting Synchrotron for Hadron Therapy injection, ion, dipole, emittance 77
 
  • E. Syresin, N. N. Agapov, A. V. Eliseev, G. G. Hodshibagijan, V. Karpinsky, A. D. Kovalenko, I. N. Meshkov, V. A. Mikhailov, A. G. Olshevsky, G. Shirkov, S. G. Shirkov, G. V. Trubnikov, A. Tuzikov
    JINR, Dubna, Moscow Region
  The project of medical carbon synchrotron at maximal ion energy of 400 MeV/n was developed in JINR. The project goal is accumulation of the superconducting technology at construction of the carbon synchrotron with a circumference of 65 m on basis of Nuclotron type magnet elements. For injection of the carbon ions it is proposed to use IH linac of C4+ at energy 4 MeV/n. Superconducting gantry at a weight of 150 t is developed for patient treatment.  
 
TUPSA028 Calibration of the Electrostatic Beam Position Monitors for VEPP-2000 vacuum, pick-up, electron, optics 98
 
  • Yu. A. Rogovsky, I. Nesterenko
    BINP SB RAS, Novosibirsk
  The basic requirement for the VEPP-2000 Beam Position Monitor (BPM) is the measurement of the beam orbit with 0.1 mm precision. To improve the measurement accuracy, the response of the electrostatic BPMs (pickups) were mapped in the laboratory before they were installed in the VEPP-2000 ring. The wire method for the sensitivity calibration and position-to-signal mapping is used. The test stand consists of high frequency coaxial switches to select each pickup electrode, movable antenna to simulate the beam, signal source, spectrum analyzer to measure the pickup signals, and analysis software. This calibration showed possibility of required accuracy. During calibration the electrical center of the different BPMs was measured with respect to the mechanical center. Conversion between the BPM signal and the actual beam position is done by using polynomial expansions fit to the mapping data within ±6 mm square. Results for these portions of the calibration are presented.  
 
WECHA02 Acceleration of Deuterons up to 23.6 GeV per Nucleon through I100, U1.5, and U70 of IHEP light-ion, acceleration, ion, proton 130
 
  • S. V. Ivanov
    IHEP Protvino, Protvino, Moscow Region
  The paper* reports on the recent progress en route of implementing the program of accelerating light ions in the Accelerator Complex U70 of IHEP-Protvino. The crucial milestone of guiding the deuteron beam through entire cascade of three accelerators available to a specific kinetic energy of 23.6 GeV per nucleon was accomplished in April 2010, which confirms feasibility of the project goal to diversify our main proton machine U70 to a light-ion synchrotron as well.

* On behalf of the U70 staff

 
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WECHB01 Radiation Sources at Siberia-2 Storage Ring radiation, emittance, electron, undulator 141
 
  • N. V. Smolyakov, V. Korchuganov, S. I. Tomin
    RRC, Moscow
  At present synchrotron radiation, generated in uniform magnetic fields of bending magnets, is employed at Siberia-2 storage ring. In the near future most of the storage ring’s straight sections should be completed with different insertion devices (undulators, wigglers). In this paper, two projects of radiation sources at Siberia-2 storage ring are considered. The first one is in-vacuum short period mini-undulator, which is projected for generation of extremely bright X-ray beams. It is shown the feasibility of diffraction-limited in vertical direction X-ray source, which is to say that vertical emittance of the electron beam is equal to diffraction emittance of generated by undulator 2 KeV photon beam. The second source will utilize edge radiation, which is generated in the fringe fields of the bending magnets. Numerical simulations show that the edge radiation is more intensive in infrared – ultraviolet spectral range as compared with standard synchrotron radiation from regular part of bending magnet.  
slides icon Slides  
 
WEPSB007 The Expanded Program Tools for KSRS Operation with Archivation of Data controls, vacuum, electron, synchrotron-radiation 187
 
  • E. V. Kaportsev
    RRC, Moscow
  The running cycle of Kurchatov Synchrotron Radiation Source (KSRS) includes the injection of electrons with energy 80 MeV from the linear accelerator in the booster storage ring Siberia-1, the accumulation of a electron current up to 400 mA and, then, electron energy ramping up to 450 MeV with the subsequent extraction of electrons in the main ring, storage ring Siberia-2, and accumulation there up to 300 mA, and at last the energy ramping up to 2.5 GeV. The control system is based on the distributed network of the processors operating technological systems of KSRS. The operational level of control system is realized as a local network of the personal computer. The database describing logic channels of the control, modes of the technological systems and the script of the running cycle of accelerating facilities is developed. The database for preservation of the received parameters of a complex is developed, the program of an archiving received with ADC data is developed. Logic channels of the control are a basis for creation of the user interface. The examples of realization of the software used in operative work KSRS are given.

E. Kaportsev et al., The program tools for KSRS operation. Proceedings of RuPAC XX, Zvenigorod, Russia, 2008.

 
 
WEPSB021 RF Cavities HOM Longitudinal Instabilities at SR Source Siberia-2 in KCSR storage-ring, injection, electron, feedback 210
 
  • V. I. Moiseev, V. Korchuganov, A. Vernov
    RRC, Moscow
  The electron beam parameters stability and its lifetime depend on the resonant excitation by RF cavities HOMs. The instability rising links with the temperature change, the sequent tune of RF cavities and the synchrotron tune change. Besides that the different intensity bunch distribution along the orbit influences strongly on the instability appearance. For the instabilities study and their identification the spectrum analyzing is used. The results of instabilities study at SR source Siberia-2 is presented in the report.  
 
WEPSB026 Digital Longitudinal Feedback Systems in Synchrotrons feedback, damping, acceleration, kicker 224
 
  • V. Zhabitsky
    JINR, Dubna, Moscow Region
  The stability of a beam in synchrotrons with a digital longitudinal feedback system is treated. A longitudinal feedback system is required in synchrotrons to stabilize the high intensity beams against longitudinal instabilities and to damp the phase injection errors of a bunch. Damping rates of the digital longitudinal feedback system in dependence of its gain and delay are analysed.  
 
WEPSB039 Upgrade of the U-70 Proton Synchrotron Extracted Beam Lines Control System: Multiple Access and Data Presentation controls, proton, feedback, quadrupole 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.  
 
WEPSB042 Universal Timer Module for the Timing System of the Accelerating-Storage Complex ITEP-TWAC controls, ion, linac, extraction 269
 
  • A. Y. Orlov, P. N. Alekseev, S. V. Barabin, D. A. Liakin
    ITEP, Moscow
  A multipurpose synchronization module for renovating timing system of ITEP-TWAC accelerator facility is developed. A group of such modules is aimed to implement a sophisticated set of synchronization functions among four accelerators – proton linac I2, ion injector I3, buster synchrotron UK and accelerating and storage ring U10. This FPGA based module generates up to 16 output pulses related to timing scale (T), magnetic field scale (B), radio frequency, external events or their combination. The read back function allows controlling the pulses propagation on cycle-to-cycle basis. The structure of the module, a description of basic functions and IO interface are presented in details. Also an example of system configuration based on the developed module is discussed.  
 
THPSC007 Study of Electrodynamic and Thermodynamic Mechanisms Influencing Stability of Superconducting Rutherford Cable quadrupole, simulation, 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.  
 
THPSC016 The Detection of the Leaks Location in the Vacuum Chamber According to Sputter-Ion Pumps Current Measurements vacuum, proton, site, scattering 355
 
  • K. G. Mirzoev, A. M. Kiver, V. G. Lapygin, A. V. Larionov
    IHEP Protvino, Protvino, Moscow Region
  Our work presents the analysis of methodology detecting the leaks locations in the vacuum chamber of the proton synchrotron U-70. We present the results of solutions of differential equations for the pressure of the air components allowing to determine the leak location. The pressure is calculated by the measurements of the sputter-ion pumps discharge current.  
 
THPSC018 Power Source for High Voltage Column of Injector to Proton Synchrotron with Output Power up to 5kW controls, resonance, proton, electron 360
 
  • D. V. Senkov, Yu. I. Golubenko, A. S. Medvedko, P. I. Nemytov, D. N. Pureskin
    BINP SB RAS, Novosibirsk
  The presented report contains the description of power source with 400Hz output voltage of sinusoidal shape with amplitude up to 300V and output power up to 5kW, operating on the primary coil of high voltage transformer of precision 1.5MV high voltage source for proton synchrotron injector. The source consists of the converter with IGBT switches , working with a principle of pulse-width modulation on programmed from 15 to 25 kHz frequency, modulated with amplitude and frequency regulated sinusoidal 400Hz signal, transformer and the synchronous rectifier with IGBT switches, controlled synchronous with converter. The efficiency of system is more than 80% at the nominal output power 5kW. The controller of the source is developed with DSP and PLM, which allows optimizing operations of the source. For control of the source serial CAN-interface is used. The description of the source and the test results are presented.  
 
THPSC025 Low Level RF Control of ITEP-TWAC Facility controls, booster, ion, proton 374
 
  • P. N. Alekseev, S. V. Barabin, A. D. Milyachenko, V. P. Zavodov
    ITEP, Moscow
  Digital LLRF control system was developed to improve the RF system mobility in multimode operation of the ITEP-TWAC booster and main synchrotrons. High precision mapping of the magnetic field derivative signal to the reference function of accelerating frequency f(B) allows to accelerate ions of any type in both rings up to relativistic energies even without feedback loops. The first modification of the LLRF control module is based on a fixed point DSP, which operates with the frequency lookup table to calculate the accelerating frequency. This module is now used in the booster synchrotron. Upgraded module has a floating point DSP, which allows calculation of the accelerating frequency "on the fly". This module is in operation in the main ring. Short description of the systems is given. Some results and experience obtained at operation with the number of types of particles, such as protons and ions of carbon, aluminum, iron and silver, are presented.