Keyword: radiation
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MOPLR022 Commissioning and First Results from the Fermilab Cryomodule Test Stand cavity, vacuum, cryomodule, controls 185
 
  • E.R. Harms, M.H. Awida, C.M. Baffes, K. Carlson, S.K. Chandrasekaran, B.E. Chase, E. Cullerton, J.P. Edelen, J. Einstein, C.M. Ginsburg, A. Grassellino, B.J. Hansen, J.P. Holzbauer, S. Kazakov, T.N. Khabiboulline, M.J. Kucera, J.R. Leibfritz, A. Lunin, D. McDowell, M.W. McGee, D.J. Nicklaus, D.F. Orris, J.P. Ozelis, J.F. Patrick, T.B. Petersen, Y.M. Pischalnikov, P.S. Prieto, O.V. Prokofiev, J. Reid, W. Schappert, D.A. Sergatskov, N. Solyak, R.P. Stanek, D. Sun, M.J. White, C. Worel, G. Wu
    Fermilab, Batavia, Illinois, USA
 
  Funding: Operated by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the United States Department of Energy.
A new test stand dedicated to SRF cryomodule testing, CMTS1, has been commissioned and is now in operation at Fermilab. The first device to be cooled down and powered in this facility is the prototype 1.3 GHz cryomodule assembled at Fermilab for LCLS-II. We describe the demonstrated capabilities of CMTS1, report on steps taken during commissioning, provide an overview of first test results, and survey future plans.
 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR022  
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MOP106015 Commissioning Status of the Chopper System for the MAX IV Injector electron, injection, linac, storage-ring 316
 
  • D. Olsson, J. Andersson, F. Curbis, L. Isaksson, L. Malmgren, E. Mansten, S. Thorin
    MAX IV Laboratory, Lund University, Lund, Sweden
 
  The MAX IV facility in Lund, Sweden consists of two storage rings for production of synchrotron radiation. The two rings are designed for 1.5 GeV and 3 GeV, respectively, where the former is under construction, and the latter is undergoing beam commissioning. Both rings will be operating with top-up injections delivered by a full-energy injector that consists of 39 traveling-wave S-band LINAC structures. In order to reduce losses of high-energy electrons along the injector and in the rings during injection, only electrons that are within an allowed time structure are accelerated. This time structure depends on several parameters such as the available RF voltage and the radiation losses in the ring that is about to be injected, but also on the momentum acceptance of the transport lines in the injector. The electrons that are outside the allowed time structure are dumped when they have energies below 3 MeV by a chopper system that is located between a thermionic RF gun and the first LINAC structure. Basically, the chopper system consists of two planar striplines and a variable aperture, and the first stripline is fed with a superposed RF signal and the second one with HV pulses. The performance of the chopper system during commissioning of the 3 GeV ring is presented in this article.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOP106015  
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MOP106022 Generation of Coherent Undulator Radiation at ELPH, Tohoku University undulator, electron, ion, focusing 330
 
  • S. Kashiwagi, T. Abe, H. Hama, F. Hinode, T. Muto, I. Nagasawa, K. Nanbu, H. Saito, Y. Saito, Y. Shibasaki, K. Takahashi
    Tohoku University, Research Center for Electron Photon Science, Sendai, Japan
 
  A test accelerator as a coherent terahertz source (t-ACTS) has been under development at Tohoku University, in which an intense coherent terahertz (THz) radiation generated by an extremely short electron bunch. Velocity bunching scheme in a traveling accelerating structure is employed to generate femtosecond electron bunches. Spatial and temporal coherent radiation in THz region can be produced by the electron bunches with small transverse emittance. A long-period undulator, which has 25 periods with a period length of 10 cm and a peak magnetic field of 0.41 T, has been also developed and installed to provide intense coherent THz undulator radiation. By optimizing the bunch length, we found that it is possible to generate a coherent undulator radiation that contain only the fundamental wave from numerical studies. We are planning an experiment with 30 MeV beam to generate a coherent undulator radiation of 2.5THz. In the conference, we will report the preliminary experimental results.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOP106022  
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TUOP09 State of the Art Advanced Magnetron for Accelerator RF Power Source cathode, linac, cavity, electron 405
 
  • H. Obata, K. Furumoto, H. Miyamoto
    New Japan Radio Co., Ltd., Fujimino Saitama, Japan
 
  X ray sources for linear accelerators continue to be a necessary requirement for industries such as medical, inspection, and nondestructive test equipment. Future requirements for such sources are; low cost, compact packaging and high performance of the RF source for electron acceleration. The magnetron has proven to be a perfect source over other RF sources for linear accelerator use. Because of its simple design, low cost per output, small size and proven performance it meets all required characteristics. New Japan Radio Co., Ltd. has improved and modified its linac magnetrons' performance and characteristics enabling easy matching to the linac modulator, long life and maximum output power. This paper will provide a detailed explanation on the improved magnetron design methodology and its effects on the performance of these magnetrons installed in linac systems. These technologies have been utilized successfully on a commercial level worldwide over the last few years. The technology has been deployed into linac systems operating in S and X band and soon C band, at various output power levels.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUOP09  
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TUPLR020 Commissioning of the Compact 14MeV LINAC for an FEL-Based THz Source linac, target, quadrupole, gun 509
 
  • Y.J. Pei, G. Feng, X.Y. He, Y. Hong, G. Huang, D. Jia, K. Jin, J. Liu, P. Lu, L. Shang, B.G. Sun, Zh. X. Tang, W. Wei, Z. Zhao
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  • L. Cao, Q.S. Chen, S. Hu, T. Hu, J. Li, Y.J. Liang, B. Qin, B. Tang, T. Tang, Y.Q. Xiong, Q. Zhang
    HUST, Wuhan, People's Republic of China
  • W. Chen, Y.B. Wang, J. Zha
    Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China
  • G. Feng
    DESY, Hamburg, Germany
  • Zh. X. Tang
    DICP, Dalian, People's Republic of China
 
  Commissioning the compact LINAC of 14Mev for a THz source based on FEL Y.J.Pei National Synchrotron Radiation laboratory, University of Science & Technology of China Abstract The compact LINAC of 14MeV is designed for a FEL which will produce a THz radiation through 30μm to 300μm. The LINAC was composed of a novel EC-ITC-RF gun, constant gradient travelling wave accelerator with a collinear absorbing load, focusing system, RF power system, beam diagnostic system, vacuum system, control system and so on. The LINAC was installed on November of 2014. Last year, we finished the install of the undulator and the optical resonance cavities. Now the LINAC has been testing and commissioning for THz radiation test. So far, the running beam parameters of the LINAC are as the following: Energy is of 13.58MeV macro pulse current is of 655mA macro pulse length of 1.2μsμpulse beam current is of 59A beam length of theμpulse is of 4ps energy spread of 0.33% normal beam emmitance is of 24.1mm.mrad.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR020  
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TUPLR072 Fabrication and Low Temperature Test Plan for Rare Isotope Science Project cryomodule, SRF, cavity, linac 619
 
  • W.K. Kim, M.J. Joung, Y. Jung, H. Kim, J.-W. Kim, Y. Kim, I. Shin
    IBS, Daejeon, Republic of Korea
 
  Quarter-wave resonator (QWR), half-wave resonator (HWR) and single-spoke resonator (SSR) cryomodules are used for RAON accelerator. The layout of RAON accelerator and three types of cryomodules such as QWR, HWR and SSR are shown in the linac. SRF test facility which consists of cryoplant, cleanroom, vertical test facility and horizontal test facility is constructed. Cleanroom has high pressure rinsing (HPR), ultrasonic cleaning (USC), buffered chemical polishing (BCP), high vacuum furnace and cavity assemble place. The test plan for cavity and cryomodules is presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR072  
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THPRC031 Manufacturing of MEBT Combined Quadrupole & Steerer Magnets for the Linear IFMIF Prototype Accelerator LIPAC quadrupole, factory, beam-transport, vacuum 840
 
  • J. Castellanos, B. Brañas, J. Mollá, C. Oliver, I. Podadera, F. Toral
    CIEMAT, Madrid, Spain
  • R. Iturbe, B. López
    ANTEC Magnets SLU, Vizcaya, Spain
  • O. Nomen
    IREC, Sant Adria del Besos, Spain
 
  Funding: This work has been funded by the Spanish Ministry of Economy and Competitiveness under the Agreement as published in BOE, 16/01/2013, page 1988.
The Medium Energy Beam Transport line (MEBT) that is being installed on the LIPAC accelerator* will have five quadrupole and steerer magnets which have been recently manufactured and tested. The design of the magnets was done by CIEMAT** and considers a magnetic yoke made of four solid iron quadrants joined together. The yoke integrates four water-cooled coils (quadrupole) and eight air-cooled coils (steerers) made of copper wires. The manufacturing and testing (excluded magnetic measurements) of the five magnets were carried out by the Spanish company ANTECSA. This paper focuses on the technical aspects considered during the manufacturing and the assembly of the different components of the magnets. The details about the geometrical, electrical and hydraulic measurements and tests that were carried out before the magnetic measurements are also described.
* A. Mosnier et al., IPAC10, MOPEC056, p.588, Kyoto, Japan (2010)
** C. Oliver et al., IPAC11, WEPO014, p. 2424, San Sebastián, Spain (2011)
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPRC031  
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THPLR003 Fabrication and High-Gradient Testing of an Accelerating Structure Made From Milled Halves shielding, linac, collider, accelerating-gradient 845
 
  • W. Wuensch, T. Argyropoulos, N. Catalán Lasheras, D. Esperante Pereira, J. Giner Navarro, A. Grudiev, G. McMonagle, I. Syratchev, B.J. Woolley, H. Zha
    CERN, Geneva, Switzerland
  • T. Argyropoulos, D. Esperante Pereira, J. Giner Navarro
    IFIC, Valencia, Spain
  • G.B. Bowden, V.A. Dolgashev, A.A. Haase
    SLAC, Menlo Park, California, USA
  • P.J. Giansiracusa, T.G. Lucas, M. Volpi
    The University of Melbourne, Melbourne, Victoria, Australia
  • R. Rajamaki
    Aalto University, School of Science and Technology, Aalto, Finland
  • X.F.D. Stragier
    TUE, Eindhoven, The Netherlands
 
  Accelerating structures made from parts which follow symmetry planes offer many potential advantages over traditional disk-based structures: more options for joining (from bonding to welding), following this more options for material state (heat treated or not) and potentially lower cost since structures can be made from fewer parts. An X-band structure made from milled halves, and with a standard benchmarked CLIC test structure design has been fabricated and high-gradient tested in the range of 100 MV/m.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR003  
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THPLR004 Development of 1.3 Ghz Single-Cell Superconducting Cavities With Nb Material Developed by Ulba Metallurgical Plant cavity, accelerating-gradient, niobium, vacuum 849
 
  • T. Ota, N. Kuroiwa, S. Nomura, Y. Otani, M. Takasaki, M. Yamada
    Toshiba, Yokohama, Japan
  • H. Hayano, T. Saeki
    KEK, Ibaraki, Japan
  • Y.V. Krygin, V. Kuznetsov, A.A. Tsorayev
    Ulba Metallurgical Plant, Ust-Kamenogorak, Kazakhstan
  • Y. Shirota
    BE International Corporation, Tokyo, Japan
  • T. Tosaka
    Toshiba Corporation, Power And Industrial Systems Research and Development Center, Yokohama, Japan
 
  TOSHIBA has been developing high purity niobium (Nb) material for superconducting cavities with ULBA Metallurgical Plant (UMP) since 2008. Recently, we have produced the high purity Nb plates. Two 1.3 GHz single-cell superconducting cavities using UMP's Nb plates have been fabricated by TOSHIBA and RF tested at High Energy Accelerator Research Organization (KEK). One of the cavities has achieved the accelerating gradient of Eacc=31.8 MV/m. The development of high purity Nb plates, details of the fabrication of the cavities and the RF test results are presented in this article.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR004  
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THPLR007 Dark Current Studies in ILC Main Linac linac, focusing, operation, electron 855
 
  • A.I. Sukhanov, I.L. Rakhno, N. Solyak, I.S. Tropin
    Fermilab, Batavia, Illinois, USA
 
  Studies and optimization of design of the International Linear Collider (ILC) based on the TESLA-type 9-cell 1.3 GHz superconducting RF (SRF) cavities are currently underway. Dark current electron generated by field emission (FE) in SRF cavities can be captured and accelerated in the main ILC linac up to very high energy before they are removed by focusing and steering magnets. Dark current electrons, interacting with the materials surrounding SRF cavities, produce electromagnetic showers and contribute to the radiation in the main ILC tunnel. In this paper present preliminary results of the simulation study of dark current in the ILC linac.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR007  
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FR1A04 Ion Effects in High Brightness Electron Linac Beams ion, linac, experiment, electron 1032
 
  • S.J. Full, A.C. Bartnik, I.V. Bazarov, J. Dobbins, B.M. Dunham, G.H. Hoffstaetter, K. J. Smith
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
 
  Electron beams ionize rest gas particles which then accumulate around them, disturbing beam dynamics and causing background radiation. While this effect has been predicted in the past, linacs have hitherto not suffered from it because of their rather small beam current. The effect of ions increases with larger currents and smaller cross sections of the beam, and it has clearly been observed in Cornell's high-brightness ERL injector for the first time. This presentation will show experimental evidence for ions, demonstrate strategies for their elimination, and will compare the experimental data to theories of beam-ion interactions.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-FR1A04  
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