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vacuum

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TUPSA005 A 12 GHz Pulse Compressor and Components for CLIC Test Stand coupling, controls, simulation, recirculation 44
 
  • S. V. Kuzikov, A. A. Bogdashov, G. G. Denisov
    IAP/RAS, Nizhny Novgorod
  • K. M. Schirm, I. Syratchev
    CERN, Geneva
  • A. A. Vikharev
    Omega-P, Inc., New Haven, Connecticut
  The X-band power test stand needed for preprocessing and testing of key CLIC RF components is being installed in the test facility CTF3. The test stand includes several 12 GHz XL5 klystrons (50 MW, 1.5 mks) and a pulse compressor of the SLED-I type to obtain over 120 MW peak power at 230 ns pulse length. A compact compressor of this type based on TE01-TE02 beating wave in high Q-factor compressor’s cavities has been designed, produced, and tested at low power level. For testing accelerating structures and so-called "CLIC recirculation principle" of its operation several -3 dB couplers and variable power attenuators were also produced and tested.  
 
TUPSA006 Experiment on RF Heating of the Copper Cavity - the Imitator of the CLIC High-Gradient Accelerating Structure controls, electron, radiation, induction 47
 
  • S. N. Sedykh, E. V. Gorbachev, A. K. Kaminsky, N. I. Lebedev, E. A. Perelstein, N. V. Pilyar, T. V. Rukoyatkina, V. V. Tarasov
    JINR, Dubna, Moscow Region
  • S. V. Kuzikov, N. Yu. Peskov, M. I. Petelin, A. A. Vikharev
    IAP/RAS, Nizhny Novgorod
  The facility for joint experiments of JINR-IAP RAS has been commissioned to investigate the lifetime dependence of the CLIC high-gradient accelerating structure* on the surface damage by repetitive high-power RF pulses. The facility is based on the 30 GHz JINR free-electron maser, which uses an electron beam of the induction linear accelerator LIU-3000 **. Intermediate optical observations of the central ring allowed us to control the process of the damage evolution. The first damage of the copper surface have been observed after 16000 pulses with the pulse heating of 240°C. After 63000 pulses the damage of the surface of the oxygen-free copper cavity became strong enough to cause regular breakdowns inside the test cavity.

* I. Wilson – CERN AB-2004-100, CLIC Note 617, Dec. 2004, 12pp.
** A. V.Elzhov et al. - Nucl. Instr. and Meth., A, Vol. A528, 2004, pp.78-82.

 
 
TUPSA007 Thermal Balance of Multilayered Tunable Dielectric Loaded Wakefield Accelerating Structure acceleration, induction, radiation, electromagnetic-fields 50
 
  • I. L. Sheynman
    LETI, Saint-Petersburg
  • A. Kanareykin
    Euclid TechLabs, LLC, Solon, Ohio
  • I. Ya. Sheynman
    St. Petersburg State Polytechnic University, St. Petersburg
  Funding: Ministry of Education and Science of Russia, “Scientific and scientific-pedagogical personnel of innovative Russia” and the Russian Foundation for Basic Research (09-02-00921)

Thermal balance of a cylindrical tunable multilayer dielectric-filled accelerating structure is considered. One ceramic layer of the structure possesses ferroelectric properties, which allow the waveguide frequency spectrum to be tuned by varying the permittivity of the ferroelectric layer. Dielectric and induction losses in ferroelectric layer and a metal shell leads to a structure warming up and increasing temperature of the ferroelectric layer. Because of a temperature sensitivity of dielectric permittivity of ferroelectric layer this effect may detune the accelerating structure. On the basis of the analysis of a thermal regime of multilayered wakefield structure the medium and pulse temperature deviations are determined. A repetition rate of electronic bunch series should be chosen to limit temperature detuning.

 
 
TUPSA009 Interbunch Energy Exchange in the Accelerating Scheme with Uniform Charge Distribution extraction, acceleration, electron, focusing 53
 
  • I. L. Sheynman
    LETI, Saint-Petersburg
  • A. Kanareykin
    Euclid TechLabs, LLC, Solon, Ohio
  Funding: Ministry of Education and Science of Russia, “Scientific and scientific-pedagogical personnel of innovative Russia” and the Russian Foundation for Basic Research (09-02-00921)

The efficiency of energy transformation in multi bunch accelerating schema with uniform charge distribution is considered. The transmitted energy to accelerated bunch taking into account driving bunch exit of relativism and settling them on the walls of the waveguide is determined. It is shown that accounting losses charge of generator beam increases passed accelerated bunch energy by eliminating exhaust bunches.

 
 
TUPSA011 Hollow Photocathode Concept for E-gun laser, cathode, electron, emittance 59
 
  • M. A. Nozdrin, N. Balalykin, V. Minashkin, G. Shirkov, E. Syresin, G. V. Trubnikov
    JINR, Dubna, Moscow Region
  • J. Huran
    Slovak Academy of Sciences, Institute of Electrical Engineering, Bratislava
  Photocathodes are the key devices for high-quality electron bunches generation. Such bunches are needed as initial electron source in contemporary linear accelerators. In all cases there are several important parameters: fast response time, quantum efficiency, long lifetime, low thermal emittance, minimal effect on RF properties of the accelerating system. In this paper the new concept of the photocathode is proposed – hollow (absolutely transparent for the laser beam) photocathode. Such cathode geometry allows quantum efficiency rising due to surface photoelectric effect which is concerned with normal to material surface wave electric field multiplier. Usability investigation experimental results for both hollow photocathodes made of bulk materials (Nb, Cu) and by thin-film technology (CsITe and diamond-like carbon as film on copper substrate) are given. After Nb hollow photocathode irradiation by a laser beam (Lambda = 266 nm, tau pulse = 15 ns, frequency 1 Hz) a charge of 64nC was extracted. Backside irradiation radically simplifies laser beam targeting on emitting surface, accelerator equipment adjustment and allows photocathode working surface laser cleaning.  
 
TUPSA016 Stochastic Cooling System Prototype for Nuclotron pick-up, kicker, ion, collider 74
 
  • A. O. Sidorin
    JINR, Dubna, Moscow Region
  Joint Institute for Nuclear Research (JINR) initiated the creation of a new and unique heavy-ion collider – Nuclotron-based Ion Collider Facility (NICA). By estimations the luminosity will mainly be limited by the intra-beam scattering effect. To suppress one, it was proposed to use the beam cooling. In the coming years it’s planned to construct stochastic cooling system prototype at operating accelerator Nuclotron to test different working modes. An analyze of existing methods of stochastic cooling is given in the report. The first results of simulations and different elements of the system prototype for Nuclotron, as well as plans for its realization at JINR are presented.  
 
TUPSA022 Simulation of Au32+ Beam Losses Due to Charge Exchange and Dynamic Vacuum in Nuclotron Booster booster, ion, simulation, beam-losses 89
 
  • A. O. Sidorin, A. Kuznetsov, V. A. Mikhaylov, G. V. Trubnikov
    JINR, Dubna, Moscow Region
  • A. V. Philippov
    JINR/VBLHEP, Dubna, Moscow region
  • P. Puppel, P. J. Spiller
    GSI, Darmstadt
  The StrahlSim code was used to simulate the beam loss and the dynamic vacuum for the proposed Nuclotron booster. The Nuclotron booster will accelerate Au32+ ions from 6.2 MeV/u to 600 MeV/u. The simulations have been carried out considering systematic injection (0% to 10%) and RF-capture losses (5% to 15%). Furthermore the influence of an ion catcher system on the beam loss has been investigated, in order to estimate, if such a system could stabilize the beam loss. Without an ion catcher system, zero systematic losses, and a static pressure of , the transmission was calculated to be 83%. The presence of an ion catcher system would stabilize the transmission at a considerably higher level than without such a system for all scenarios.  
 
TUPSA027 The Compact Faraday Cup for Radiobiological Researches in IHEP Accelerators Beams ion, proton, acceleration, electron 95
 
  • A. V. Koshelev, Y. Antipov, G. A. Dantsevich, A. V. Larionov, V. S. Seleznev
    IHEP Protvino, Protvino, Moscow Region
  IHEP’s experts are currently working on the creation of a medical irradiation centre with beams of protons and carbon ions on the basis of an accelerating complex. Already existing accelerators I-100 - U-1,5 - U-70 are forming a complete chain capable of accelerating not only protons, but also, due to certain modifications, light deuteron and carbon nucleus. The compact autonomic Faraday cup which works in the atmospheric environment has been developed to measure currents in the accelerators beams. The device has a good electromagnetic protection. It is compact and allows to make measurements on any (from 600 mm long) open site of a beam line. Vacuum tests and work with biological samples on a beam of protons of I-100 accelerator have proved that the Faraday cup is meeting all the requirements.  
 
TUPSA028 Calibration of the Electrostatic Beam Position Monitors for VEPP-2000 pick-up, electron, optics, synchrotron 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.  
 
TUPSA030 Beam Measurements With Visible Synchrotron Light on VEPP-2000 Collider controls, collider, diagnostics, electron 104
 
  • Yu. A. Rogovsky, D. E. Berkaev, A. N. Kyrpotin, I. Nesterenko, A. L. Romanov
    BINP SB RAS, Novosibirsk
  This paper describes beam diagnostics at VEPP-2000 collider, based on visible synchrotron light analysis. These beam instruments include: SR beamline and optics; acquisition tools and high resolution CCD cameras distributed around the storage ring to measure the transverse beam profile and its position in vacuum chamber; photomultiplier tubes (PMT) which enables beam current measurements; video system. Some applications of these measurement systems and their measurement results are presented.  
 
WECHA01 Status of the Nuclotron ion, acceleration, heavy-ion, ion-source 127
 
  • A. O. Sidorin, N. N. Agapov, V. Aleksandrov, V. Batin, A. V. Butenko, E. D. Donets, A. V. Eliseev, A. Govorov, V. Karpinsky, V. D. Kekelidze, H. G. Khodzhibagiyan, A. Kirichenko, A. D. Kovalenko, O. S. Kozlov, I. N. Meshkov, V. A. Mikhailov, V. Monchinsky, S. Romanov, V. Shevtsov, A. N. Sissakian, I. Slepnev, V. Slepnev, G. V. Trubnikov, B. Vasilishin, V. Volkov
    JINR, Dubna, Moscow Region
  • O. I. Brovko
    JINR/VBLHEP, Moscow
  The 'Nuclotron-M' project started in 2007 is considered as the key point of the first stage of the NICA/MPD project. General goal of the 'Nuclotron-M' project is to prepare all the systems of the Nuclotron for its long and reliable operation as a part of the NICA collider injection chain. Additionally the project realization will increase the Nuclotron ability for realization of its current experimental program. Results of the last runs of the Nuclotron operation are presented.  
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WECHZ02 Progress with the 2 MeV Electron Cooler for COSY-Juelich/HESR electron, antiproton, pick-up, target 147
 
  • J. Dietrich, V. Kamerdzhiev
    FZJ, Jülich
  • M. I. Bryzgunov, A. D. Goncharov, V. V. Parkhomchuk, V. B. Reva, D. N. Skorobogatov
    BINP SB RAS, Novosibirsk
  The 2 MeV electron cooling system for COSY-Juelich was proposed to further boost the luminosity even in presence of strong heating effects of high-density internal targets. The project is funded since mid 2009. Manufacturing of the cooler components has already begun. The space required for the 2 MeV cooler is being made available in the COSY ring. The design and construction of the cooler is accomplished in cooperation with the Budker Institute of Nuclear Physics in Novosibirsk, Russia. The 2 MeV cooler is also well suited in the start up phase of the High Energy Storage Ring (HESR) at FAIR in Darmstadt. It can be used for beam cooling at injection energy and is intended to test new features of the high energy electron cooler for HESR. The technical layout of the 2 MeV electron cooler is described and the status of component manufacturing is reported.  
 
WECHZ03 Development of Electron Cooler Components for COSY electron, secondary-beams, gun, proton 151
 
  • V. V. Parkhomchuk, M. I. Bryzgunov, A. V. Bubley, V. G. Cheskidov, A. D. Goncharov, A. Kryuchkov, V. A. Polukhin, A. A. Putmakov, V. B. Reva, D. N. Skorobogatov
    BINP SB RAS, Novosibirsk
  Design, production and experiments with prototype of the 2 MV COSY electron cooler commponents reported. The system for transfer 40 kW power along acceleration tube described.  
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WECHC01 Advance in the LEPTA Project positron, electron, focusing, gun 166
 
  • A. G. Kobets, E. V. Ahmanova, M. K. Eseev, V. Karpinsky, V. I. Lokhmatov, V. N. Malakhov, I. N. Meshkov, V. Pavlov, A. Yu. Rudakov, A. A. Sidorin, S. Yakovenko
    JINR, Dubna, Moscow Region
  The progress since RuPAC'2008 in Low Energy Positron Toroidal Accumulator (LEPTA) project at JINR is reported. The significant development of the facility includes an increase of circulating beam life time, fabrication and commissioning of improved injection system, manufacturing of positron transfer channel, test of low energy positron injector and positron trap. First positron injection into the ring is under preparation.  
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WEPSB007 The Expanded Program Tools for KSRS Operation with Archivation of Data controls, electron, synchrotron, 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.

 
 
WEPSB018 Transverse Bunch Dynamics in Rectangular Dielectric Loaded Wakefield Accelerator simulation, electron, focusing, controls 207
 
  • A. Altmark, I. L. Sheynman
    LETI, Saint-Petersburg
  • A. Kanareykin
    Euclid TechLabs, LLC, Solon, Ohio
  Funding: Ministry of Education and Science of Russia, “Scientific and scientific-pedagogical personnel of innovative Russia” and the Russian Foundation for Basic Research (09-02-00921)

Beam breakup (BBU) effects resulting from parasitic wakefields provide a potentially serious limitation to the performance of dielectric structure based accelerators. We report here on comprehensive numerical studies of transverse bunch dynamics in a rectangular dielectric loaded accelerating structure. The numerical part of this research is based on a particle-Green’s function beam dynamics code (BBU-3000) that we are developing. The code allows rapid, efficient simulation of beam breakup effects in advanced linear accelerators. It is shown that the LSE modes make its main contribution to the transverse deflecting force causing beam breakup in rectangular DLA structures. Results of test simulations are presented.

 
 
WEPSB024 An Increasing of Electron Beam Lifetime at Injection Energy in SIBERIA-2 Storage Ring by Regulating of Betatron Coupling injection, coupling, betatron, electron 218
 
  • A. G. Valentinov, V. Korchuganov, Y. V. Krylov, Y. L. Yupinov
    RRC, Moscow
  A dedicated synchrotron light source SIBERIA-2 operates at 2.5 GeV with more than 100 mA electron current. An electron beam lifetime at this energy is defined now by vacuum conditions and exceeds 15 hours for 100 mA. The lifetime at injection energy 0.45 GeV is much lower – less than half an hour for typical current value 3–4 mA in singlebunch mode. An analysis of the lifetime value displayed a strong influence of Tushek effect in a presence of a horizontal aperture limitation. A dependence of the lifetime on different parameters (RF voltage, horizontal geometric and dynamic aperture, bunch current, betatron coupling value, electron energy) was analyzed. A betatron coupling regulation was recognized the easiest way to increase lifetime value at injection energy. It was done by two families of skew-quadrupole lenses. A 30–40% increasing of the lifetime was observed for different average values of a bunch current. Also a storing speed was raised because of slower decreasing of a stored current. The beam lifetime during energy ramping was also increased. It led to decreasing of current losses from 5-6% to 1.5–2% during energy rising from 0.45 GeV to 2.5 GeV.  
 
WEPSB029 Electron Gun and Collector for 2 Mev Electron Cooler for COSY electron, gun, cathode, controls 233
 
  • A. V. Ivanov, M. I. Bryzgunov, A. V. Bubley, V. M. Panasyuk, V. V. Parkhomchuk, V. B. Reva
    BINP SB RAS, Novosibirsk
  COSY storage ring will be upgraded in 2011 by installation of a new electron cooler. Electron cooling will reduce energy spread of protons and so improve the precision of internal target experiments. Some of the most important parts of this new electron cooler are the electron gun and the collector, and they must satisfy several rigid requirements. Electron gun must provide high perveance electron beam with low transversal temperature and variable beam profile. The gun control electrode assembled of four separate sections will provide measurements of beam envelope along the transport section of the cooler. Displacement of corresponding part of the beam may be observed if alternating voltage is applied to each section. Collector should have high perveance, low secondary emission coefficient, and small dimensions. Wien filter is supposed to be installed before the collector to satisfy these requirements. In this case we can use high perveance small-scale collector with axially-symmetric magnetic field; secondary electrons will be absorbed in Wien filter. An additional vacuum pumping must be provided in the collector design.  
 
WEPSB037 Specific Features of Automatic Control Systems for Applied Cyclotrons cyclotron, controls, ion, injection 254
 
  • A. P. Strokach, V. P. Bagrievich, A. N. Kuzhlev
    NIIEFA, St. Petersburg
  A distributed automatic control system for the MCC-30-15 compact medical cyclotron has been built on the hierarchy principle. The lower hierarchical level consists of controllers for various systems of the cyclotron, which are networked on the basis of Profibus. An industrial Advantech-type computer has been chosen as the host computer of the system. The upper hierarchical level also contains computers to control the RF system of the cyclotron and operator workstation. Computers of the upper hierarchical level are networked on the basis of Ethernet. The number of computers for the operator workstation is limited only by the Ethernet bandwidth and the speed of the host computer. To measure the beam current, a multi-channel high-precision measuring current amplifier has been developed, signals from which are sent to a high-speed ADC. It is possible to view current pulse oscillograms, which makes much more easy the adjustment of the cyclotron modes.  
 
WEPSB038 LabView Control System of the Cryogenic Complex for the Kaon RF-Separator at IHEP controls, cryogenics, kaon, monitoring 257
 
  • V. Alferov, A. I. Ageev, A. Bakay, V. Fedorchenko, A. Kholkin, V. Krendelev, A. Lutchev, D. Vasiliev
    IHEP Protvino, Protvino, Moscow Region
  A cryogenic complex has been built at IHEP to provide liquid helium and nitrogen for the RF-separator of kaons. About 500 analog parameters and 300 digital signals have to be measured, tens of commands generated, and 20 closed loops activated. On a lower level of the control system there are 90 home made equipment controllers, based on Analog Device and Atmel programmable devices. They provide data acquisition, calculation of operating parameters, and generation of digital and 4-20 mA analog commands. Equipment controllers are connected to four personal computers (PC) by means of CAN field buses. The PCs in turn are connected by a dedicated Ethernet network. LabVIEW based software for control and monitoring of the cryogenic complex has been designed and developed. The paper describes the features and present status of the control electronics, firmware and software.  
 
WEPSB040 Software Service for Cryogenic Data Representation and Analysis controls, cryogenics, site, radio-frequency 263
 
  • I. Lobov, A. Lutchev, M. N. Stolyarov, S. A. Sukhov
    IHEP Protvino, Protvino, Moscow Region
  The Cryogenic and Vacuum System for OKA experimental complex requires reliable, fast and convenient program facilities for cryogenic data analysis – temperatures of cryogenic components, liquid helium levels, helium mass flow rates. The appropriate software service has been build on the base of common solution using MS SQL-server for historical data manipulation and IHEP Zerver for online data representation. Accordingly two computers are used to store and maintain cryogenic data which gives users two ways of data displaying. The archive view software (graphs, tables, correlation analysis) has been build with help of NI Developer Suit Core. The mimic panels software uses to display the live data. The mimic panels could be viewed through web-interface using Java applets, this is original software written in IHEP.  
 
WEPSB043 Control System for the New Beam Transfer Line at IHEP controls, power-supply, extraction, instrumentation 272
 
  • M. S. Mikheev
    IHEP Protvino, Protvino, Moscow Region
  A. Matyushin, L. Kopylov, S. Merker, M. Mikheev Institute for High Energy Physics, New proton beam transfer line is study project to evaluate a possibility to use UNK injection line as an experimental facility. A wide set of accelerator equipment is involved in the test. The Control system is build on OPC and CAN technology using data driven and object oriented approach. The structure, key solution and operational experience are described in the paper.  
 
THCHC01 Development and Production of Superconducting and Cryogenic Equipment and Systems for Accelerators by IHEP cryogenics, dipole, quadrupole, electron 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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THCHZ01 First Radiocarbon Measurements at BINP AMS ion, background, ion-source, target 309
 
  • S. Rastigeev, A. R. Frolov, A. D. Goncharov, V. Klyuev, E. S. Konstantinov, S. G. Konstantinov, L. A. Kutnykova, V. V. Parkhomchuk, M. Petrichenkov, A. V. Petrozhitskii
    BINP SB RAS, Novosibirsk
  Present status of the BINP accelerator mass spectrometry (AMS) facility is described. The results of experiments for beam selection and radiocarbon concentration analysis in trial samples are presented.  
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THPSC005 Materials for Fast Cycling Accelerator Superconducting Magnets dipole, quadrupole, 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, quadrupole, 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.  
 
THPSC011 Investigation on the Electron Beam Formation in the Magnetron Gun with a Secondary-Emission Cathode Using the Masgnetic System Based on Permanent Magnets cathode, electron, gun, permanent-magnet 349
 
  • N. G. Reshetnyak, M. I. Ayzatskiy, V. N. Boriskin, I. A. Chertishchev, A. N. Dovbnya, N. A. Dovbnya, V. P. Romas'ko, V. Zakutin
    NSC/KIPT, Kharkov
  The paper presents the results of investigations on the electron beam formation in the magnetron guns with secondary-emission cathodes using the magnetic system based on annular permanent magnets. The magnetic system, made of NdFeB material, has 10 cm in length, external diameter of 80 mm, internal diameter of 60 mm and longitudinal magnetic field amplitude of 800 Oe. Experiments were carried out using the magnetron guns having cathodes with diameters from 6mm to 16 mm, 75 mm in length, and an anode of 56 mm in diameter. The cathode voltage was 15…25 kV. The experimental results have demonstrated that the magnetron guns with cathodes having 6mm, 10mm and 16 mm in diameter can form tubular electron beams. Under the cathode voltage of 18 kV the electron beam current is ~3.5…5 А. The beam current dependence on the voltage obeys to the "3/2" law. As the cathode voltage was increased to 22 kV, the beam current bunch generation and anode current of ~1.0 mks were observed. As a result of investigations a compact magnetron gun with a secondary-emission cathode and a magnetic system on the base of annular permanent magnets was constructed.  
 
THPSC016 The Detection of the Leaks Location in the Vacuum Chamber According to Sputter-Ion Pumps Current Measurements proton, site, synchrotron, 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.  
 
THPSC021 Improving of the INR DTL Tank Accelerating Voltage Stability by Means of the Anode Modulator Feedback feedback, controls, cathode, pick-up 366
 
  • A. I. Kvasha
    RAS/INR, Moscow
  The INR DTL RF system consists of five RF channels with output pulse RF power from 1 to 2.5 MW. In turn, in every channel there are four RF vacuum tube amplifiers and two anode modulators. The output RF power amplifier anode modulator with hard discharger (vacuum tube GMI-44A) is used as executive device of accelerating voltage control system. The pulse transformer data at the GMI-44A input and time delay in the feedback of the control system don't allow ensuring the required accelerating voltage stabilization. Improving in a few times of accelerating field stabilization can be achieved by means of anode modulator feedback. Results of a numerical simulation of both feedbacks using MicroCap 8 are presented.  
 
THPSC024 Beam Absorber for Turning Accelerator in the Beam Layout of the Experimental Complex radiation, proton, shielding, photon 372
 
  • M. I. Grachev, V. A. Fedchenko, L. V. Kravchuk, E. V. Ponomareva
    RAS/INR, Moscow
  The absorber of a beam without moving parts in vacuum volume for adjustment the high current lenear accelerator is described.  
 
THPSC026 Status of HITS Injector ion, target, ion-source, tandem-accelerator 376
 
  • A. V. Semenov, V. G. Cherepkov, V. Klyuev, E. S. Konstantinov, E. A. Kuper, V. R. Mamkin, A. S. Medvedko, P. I. Nemytov, V. V. Repkov, V. B. Reva, R. A. Salimov, D. V. Senkov, V. A. Vostrikov
    BINP SB RAS, Novosibirsk
  Ion injector for cancer therapy facility HITS was designed and assembled at BINP. Injector is based on electrostatic tandem accelerator with 1.25 MV at the high voltage terminal. The negative ion beams are injected into tandem and charge exchanged in the vapor-magnesium target with vacuum heat insulation. The results of injector tests and working with carbon ion beam are presented.  
 
THPSC031 The Use of the Electron Beam from the Magnetron Gun-Based Accelerator for Zirconium Surface Modification electron, cathode, gun, target 384
 
  • V. Zakutin, A. N. Aksyonova, A. N. Dovbnya, S. D. Lavrinenko, V. N. Pelykh, N. N. Pilipenko, N. G. Reshetnyak
    NSC/KIPT, Kharkov
  The paper presents the results of investigations on the zirconium specimen surface after irradiation them with an electron beam from the accelerator. The operating conditions were the following: electron energy from 7 to 80 keV, pulse duration of 15 μs, pulse frequency of 2 Hz. for two modes of the energy density on the samples, namely, 10 J/сm2 and 20 J/сm2. The experiments have demonstrated that the irradiation leads to the noticeable smoothing of the specimen surface roughness, the surface becomes smoother and unruffled. The results of investigations on the microhardness of irradiated and unirradiated areas of the zirconium specimen surface areas show that the microhardness value has been increased by ~20% of the initial value (1920 MPa) for the irradiation energy density of 10 J/cm2 and by ~35% for 20 J/cm2, that can be related with a different quantity of an transferred energy of the irradiated surface. By choosing the optimum electron irradiation characteristics this technique may be recommended for hardening and modification of the near-surface layer of zirconium materials applied in the nuclear-power engineering.  
 
THPSC038 Tuning of the INR Therapeutic Proton Beam proton, scattering, quadrupole, 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.