Keyword: klystron
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MOPO036 Status of the 10 MW MBKs during Commissioning of the European XFEL in DESY FEL, operation, gun, cathode 102
 
  • V. Vogel (Fogel), L. Butkowski, A. Cherepenko, S. Choroba, J. Hartung
    DESY, Hamburg, Germany
 
  At present 26 RF stations for European XFEL are in operation. Each of the RF stations consists of a HV modulator located in a separate building on the DESY campus, up to 1600 m long 10 kV HV cables that connect the modulator and the HV pulse transformer located in the underground tunnel, 120kV, 3 m long HV cable connecting the HV pulse transformer and the connection module of the horizontal multi-beam klystron. Two RF stations of the injector have already achieved about 20000 hours of operation, RF stations of the XFEL bunch compressor area have operated up to 11000 hours and in the XFEL main linac up to 8000 hours. To increase the lifetime of the klystrons, we use a fast protection system (KLM) that is based on the comparison of the actual RF shape and the expected RF shape. In the case of a difference exceeding a certain margin, for example, in the case of RF breakdown in a klystron or RF breakdown in a waveguide system, the KLM quickly, shorter than 500 ns, switches off the input RF signal. Thus, it does prevents the vacuum level in the klystron worsen too much or it minimizes the RF overvoltage time at the output windows of the klystron in case of breakdown in waveguides.  
slides icon Slides MOPO036 [5.241 MB]  
poster icon Poster MOPO036 [0.658 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO036  
About • paper received ※ 05 September 2018      issue date ※ 18 January 2019  
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MOPO060 Linacs for Industry, Cargo Inspection and Medicine Designed by Moscow University electron, controls, radiation, operation 130
 
  • A.N. Ermakov, A.S. Alimov, A.N. Kamanin, V.V. Khankin, L. Ovchinnikova, N.I. Pakhomov, N.V. Shvedunov, V.I. Shvedunov, D.S. Yurov
    SINP MSU, Moscow, Russia
  • A.S. Alimov, A.N. Ermakov, V.V. Khankin, L. Ovchinnikova, N.I. Pakhomov, N.V. Shvedunov, V.I. Shvedunov, A.S. Simonov
    LEA MSU, Moscow, Russia
  • I.V. Shvedunov
    Federal State Unitary Enterprise, Laboratory of Electron Accelerators MSU, Ltd, Moscow, Russia
 
  Funding: Work supported in part by Ministry of Education and Science of Russia Grant # RFMEFI58217X0011
The report presents the results of development of applied linear electron accelerators with an energy of up to 10 MeV, performed by the Laboratory of Electron Accelerators MSU. We describe linear accelerators for mobile, stationary and train cargo inspection systems with interlaced energies and pulse repetition rate up to 2 kHz, accelerators for radiography, a sterilization accelerator with beam parameters that are adjustable over a wide range, and an accelerator for a radiotherapy complex.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO060  
About • paper received ※ 10 September 2018      issue date ※ 18 January 2019  
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MOPO061 Beam Parameters Measurement of C-band 6 MeV Linear Electron Accelerator gun, electron, controls, radiation 133
 
  • D.S. Yurov, A.S. Alimov, A.N. Ermakov, V.V. Khankin, N.V. Shvedunov, V.I. Shvedunov
    SINP MSU, Moscow, Russia
  • L. Ovchinnikova
    Laboratory of Electron Accelerators MSU, Ltd, Physics Department, Lomonosov Moscow State University, Moscow, Russia
  • A.S. Simonov
    LEA MSU, Moscow, Russia
 
  The new linear electron accelerator with beam energy varied in the range of 2-6 MeV with dual-energy option has been designed by Laboratory of Electron Accelerators MSU Ltd. Linac is based on compact high gradient stand-ing wave C-band accelerating structure fed by multi-beam klystron and is used in the cargo inspection and cancer therapy complexes. In the report, we present the results of electron beam parameters measurements at special stand.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO061  
About • paper received ※ 10 September 2018      issue date ※ 18 January 2019  
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TUPO001 About the Limits for the Accelerated Beam Current in the LUE-200 Linac of the IREN Facility linac, electron, acceleration, neutron 320
 
  • A.P. Sumbaev
    JINR, Dubna, Moscow Region, Russia
  • A.M. Barnyakov, A.E. Levichev
    BINP SB RAS, Novosibirsk, Russia
 
  The beam current loading of the accelerating fields is discussed for the linear accelerator LUE-200 of IREN facility. LUE-200 electron Linac consits of two disk loaded travelling wave accelerating structure with the operating frequency of 2856 MHz and power compression SLED-type system. The limits by the accelerated beam current are defined for different pulse durations of the beam current and RF power. The calculated results are discussed and compared with the measurements.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO001  
About • paper received ※ 12 September 2018      issue date ※ 18 January 2019  
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TUPO090 Electron-beam Matching to Solenoid Magnetic Field in a Klystron gun, electron, solenoid, cathode 534
 
  • S.J. Park, Y.J. Park
    PAL, Pohang, Kyungbuk, Republic of Korea
  • J.H. Hwang, S.-G. Shin
    POSTECH, Pohang, Kyungbuk, Republic of Korea
  • S.Y. Hyun, D.H. Yu
    Vitzrotech Co., Ltd., Ansan City, Kyunggi-Do, Republic of Korea
 
  Funding: The work was supported by the National R&D Program (grant number: 2016R1A6B2A01016828) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT, Korea.
High-power klystrons for particle accelerators employ high-perveance electron guns which are usually focused by Solenoid magnets. The electron beam should be optically matched to the downstream magnetic field to prevent the beam from scalloping. The task usually requires a series of computer simulations with many design parameters, and therefore requires extensive(sometimes exhaustive) efforts if not aided by a priori experiences. In order to alleviate the difficulties we have developed a matching procedure which is systematic and reliable. In this article we describe the procedure with an example design of a 400-kV 500-A electron beam with radius 8 - 11 mm.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO090  
About • paper received ※ 12 September 2018      issue date ※ 18 January 2019  
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WE1A04 The High Power RF System for the European XFEL FEL, cavity, GUI, gun 601
 
  • S. Choroba
    DESY, Hamburg, Germany
 
  The presentation will be on the design, construction and commissioning of the high power RF system for the European XFEL. The RF system consists of 26 high power RF stations each capable of 10MW RF pulse power. It will report on the overall system layout, cover RF system components e.g. klystrons, modulators and high power RF waveguide distribution. It will also cover system modifications during construction phase and report on commissioning results.  
slides icon Slides WE1A04 [12.620 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-WE1A04  
About • paper received ※ 17 September 2018      issue date ※ 18 January 2019  
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THPO003 L-band Resonant Ring for Testing RF Windows for ILC collider, linear-collider, coupling, simulation 679
 
  • B. Du, N. Liu
    Sokendai - Hayama, Hayama, Japan
  • T. Matsumoto, S. Michizono, T. Miura, F. Qiu
    KEK, Ibaraki, Japan
  • T. Matsumoto, T. Miura, F. Qiu
    Sokendai, Ibaraki, Japan
 
  A resonant ring is widely used for the breakdown test of RF components under high power. It can reach power gain of more than 10dB, which is limited by the attenua-tion of the ring. An L-band resonant ring is constructed for testing RF components of International Linear Collid-er (ILC) which is based on an RF frequency of 1.3GHz. The target of the high power test is 5 MW. We have fin-ished the test of an input power of 500 W using a solid state amplifier, and the principle of the resonant ring is verified. The resonant ring is tuned to an optimal condi-tion, which is preparation for high power operation. This paper details the principle, construction, and test of the L-band resonant ring.  
poster icon Poster THPO003 [2.301 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO003  
About • paper received ※ 13 September 2018      issue date ※ 18 January 2019  
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THPO093 Status and Results Obtained on a RF Conditioning Test Bench for 704 MHz Couplers in the Frame of ESS Project status, high-voltage, cathode, gun 895
 
  • S. Sierra, Y. Amal, Ch.L. Lievin, I. Yao Leclerc
    TED, Velizy-Villacoublay, France
  • M.E. Chahbazian, J.G. DeOliveira, A.G. Goeury, L.J. Nennig, S.P. Petitjean
    GERAC Thales, Le Barp, France
 
  Thales and Gerac are developing a test bench able to make the RF conditioning of the Fundamental Power Couplers at 704 MHz in the frame of the ESS project for CEA. The status of the developments of the test bench is described including the modulator, klystron and all relative equipments. The paper will also describes the results obtained at the date of presentation.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO093  
About • paper received ※ 10 September 2018      issue date ※ 18 January 2019  
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THPO095 Present Status of Capacitor-charging Power Supplies for Klystron Modulators in SuperKEKB Injector Linac linac, status, controls, power-supply 898
 
  • M. Kawamura, M. Akemoto, S. Fukuda, H. Honma, S. Michizono, H. Nakajima, T. Natsui, T. Shidara
    KEK, Ibaraki, Japan
  • H. Akikawa, O. Endo, K. Sato
    Nihon Koshuha Co. Ltd, Yokohama, Japan
 
  The capacitor-charging power supplies (CCPSs) for the klystron modulators have been developed from 2002 in the SuperKEKB injector linac. The specifications are that the output voltage is 43kV, the charging power is 30kJ/s, and the output voltage stability is 0.2%p-p. Being used in the old facility, their sizes are restricted in 480mm x 680 mm x 760mm. After various modifications, the 13 CCPSs in the linac have been operated with no fault since last October. The present status of the CCPSs, including the outlines, specifications, and the modifications against the faults, are described.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO095  
About • paper received ※ 12 September 2018      issue date ※ 18 January 2019  
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THPO096 Design Study of a High Efficiency Klystron for SuperKEKB Linac cavity, gun, simulation, linac 901
 
  • F. Qiu, S. Fukuda, S. Matsumoto, T. Matsumoto, T. Miura, T. Natsui
    KEK, Ibaraki, Japan
 
  The injector linear accelerator (linac) for the SuperKEKB particle accelerator requires a higher efficiency klystron than the currently used 50 MW, S-band, pulsed unit (PV3050/E3730), which operates at the same voltage, to increase the power redundancy. The efficiency is expected to improve from the currently observed 45% to more than 60%. We propose a type of high efficiency klystron using novel bunching mechanisms. The 1-D disk model based code is used for preliminary optimization of the tube parameters; these parameters are further checked by 2-D codes known as field charge interaction (FCI) and MAGIC. In this paper, the design consideration of the high efficiency klystron is presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO096  
About • paper received ※ 12 September 2018      issue date ※ 18 January 2019  
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THPO102 Design Studies of Output Window for CEPC Klystron multipactoring, simulation, electron, operation 911
 
  • Z.J. Lu, Y.L. Chi, S. Fukuda, G. Pei, S. Pei, S.C. Wang, O. Xiao, U. N. Zaib, Z.S. Zhou
    IHEP, Beijing, People’s Republic of China
  • S. Fukuda
    KEK, Ibaraki, Japan
 
  A high power and high efficiency klystron of the 650MHz, 800kW CW klystron for the Circular Electron Positron Collider (CEPC) is designed and developed at IHEP. This paper presents the design and simulation for the high power coaxial window for it. Plan of the hot test (high power testing before installing to the klystron) are also described. Simulation software of CST, ANSYS and Multipac 2.1 are used for design of window microwave structure, thermal analysis and multipacting effects. We obtained the good simulation results successively; the coaxial window S-parameter analysis, has revealed a low reflection at the operating frequency of 650 MHz. The thermal simulation shows a good temperature distribution under the cw 800kW propagation; maximum temperature has been found to be 33 °C at ceramic with water cooling in the inner and outer conductor. The multipacting at the window is possible source of the failure and it is shown that multipacting has less chance to be happened on the surface of ceramic.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO102  
About • paper received ※ 12 September 2018      issue date ※ 18 January 2019  
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