Keyword: vacuum
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MOOP08 Latest News on High Average RF Power Operation at PITZ gun, operation, cathode, Windows 59
 
  • Y. Renier, G. Asova, P. Boonpornprasert, J.D. Good, M. Groß, H. Huck, I.I. Isaev, D.K. Kalantaryan, M. Krasilnikov, O. Lishilin, G. Loisch, D. Melkumyan, A. Oppelt, T. Rublack, F. Stephan
    DESY Zeuthen, Zeuthen, Germany
  • G. Asova
    INRNE, Sofia, Bulgaria
  • M. Bousonville, S. Choroba, S. Lederer
    DESY, Hamburg, Germany
  • C. Saisa-ard
    Chiang Mai University, Chiang Mai, Thailand
  • Q.T. Zhao
    IMP/CAS, Lanzhou, People's Republic of China
  
  The Photo Injector Test Facility at DESY in Zeuthen (PITZ) develops, tests and characterizes high brightness electron sources for FLASH and European XFEL. Since these FELs work with superconducting accelerators in pulsed mode, also the corresponding normal-conducting RF gun has to operate with long RF pulses. Generating high beam quality from the photocathode RF gun in addition requires a high accelerating gradient at the cathode. Therefore, the RF gun has to ensure stable and reliable operation at high average RF power, e.g. 6.5 MW peak power in the gun for 650 μs RF pulse length at 10 Hz repetition rate for the European XFEL. Several RF gun setups have been operated towards these goals over the last years. The latest gun setup was brought into the PITZ tunnel on February 10th 2016 and its RF operation started on March 7th. This setup includes RF gun prototype 4.6 with a new cathode contact spring design and an RF input distribution which consists of an in-vacuum coaxial coupler, an in-vacuum T-combiner and 2 RF windows from DESY production. In this contribution we will summarize the experience from the RF conditioning of this setup towards high average RF power and first experience from the operation with photoelectrons.  
slides icon Slides MOOP08 [0.563 MB]  
poster icon Poster MOOP08 [0.367 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOOP08  
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MOPRC017 CIADS HEBT Lattice Design target, collimation, lattice, emittance 108
 
  • Y.S. Qin
    IMP/CAS, Lanzhou, People's Republic of China
  
  Funding: I want to apply for financial support.
CIADS (China Initiative Accelerator Driven System) 600MeV HEBT (High-Energy Beam Transport) will deliver 6 MW beam to the target, with CW (continuous wave) 10 mA beam. The most serious challenges are vacuum differential section and beam uniformization on the target. A novel collimation plus vacuum differential section is proposed in the lattice design. A scanning method is designed for the round beam uniformization on the target. 		 
poster icon Poster MOPRC017 [1.273 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPRC017  
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MOPLR009 X-Band Travelling Wave Accelerating Section R&D for HTF electron, operation, coupling, cavity 152
 
  • K. Jin
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  Hefei Light Source (HLS) was mainly composed of an 800 MeV electron storage ring and an 800MeV-1GeV constant-gradient accelerator in NSRL. The new Linac with Full Energy Injection and the Top-up Injection scheme has been developed successfully. And the other functioning as X Ray Free Electron Laser test facility has been considered. In the project, in order to compress the bunch length and to achieve the beam energy distribution linearization. A 15MeV, operation frequency 11.424GHz traveling wave accelerating section as harmonic compensation is being developed. In this paper, X Ray Free Electron Laser Hefei Test Facility (HTF) is introduce briefly. And the R&D of the x-band accelerating section with collinear load are presented in detail.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR009  
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MOPLR022 Commissioning and First Results from the Fermilab Cryomodule Test Stand cavity, cryomodule, controls, radiation 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. 		 
poster icon Poster MOPLR022 [3.431 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR022  
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MOPLR032 Preparation for Cavity Material Studies at the Vertical High-Temperature UHV-Furnace of the S-DALINAC niobium, simulation, SRF, superconductivity 209
 
  • R. Grewe, L. Alff, J. Conrad, T. Kürzeder, M. Major, N. Pietralla
    TU Darmstadt, Darmstadt, Germany
  • F. Hug
    IKP, Mainz, Germany
  
  Funding: Work supported by the Federal Ministry of Education and Research through grant No. 05H15RDRBA.
Since 2005 the Institute for Nuclear Physics at the Technische Universität Darmstadt operates a high temperature vacuum furnace. It is designed to reach temperatures of up to 1800°C. It has been used for baking out several niobium superconducting RF cavities at 850°C with proven success*. Current research for improving the performance of SRF cavities is focused on nitrogen treatment of such cavities. Nitrogen doping of SRF cavtities results in an up to four times higher quality-factor as compared to untreated cavities**. At higher temperatures between 1300°C and 1700°C the so-called delta-phase of NbN forms, which is highly interesting for applications to superconducting accelerator technology***. The UHV-furnace at the S-DALINAC offers the possibility to treat niobium samples at considerably higher temperatures than what has been done up to now in order to study the effect of delta-phase NbN and N-doping on superconducting properties. The furnace has been refurbished and recommissioned to realize research on nitrogen treatment of niobium samples. We will report on our first experiences with operating the upgraded furnace.
*Araz et al., Proceedings of SRF05, 2015
**Grasselino et al., Superconducting Science and Technology, 2013
***Pham Tu et al., Proceedings of SRF87, 1987 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR032  
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MOPLR043 Cavity Processing and Preparation of 650 MHz Elliptical Cell Cavities for PIP-II cavity, SRF, factory, cathode 229
 
  • A.M. Rowe, S.K. Chandrasekaran, A. Grassellino, O.S. Melnychuk, M. Merio, D.A. Sergatskov
    Fermilab, Batavia, Illinois, USA
  • T. Reid
    ANL, Argonne, Illinois, USA
  
  Funding: Operated by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the United States Department of Energy.
The PIP-II project at Fermilab requires fifteen 650 MHz SRF cryomodules as part of the 800 MeV LINAC that will provide a high intensity proton beam to the Fermilab neutrino program. A total of fifty-seven high-performance SRF cavities will populate the cryomodules and will operate in both pulsed and continuous wave modes. These cavities will be processed and prepared for performance testing utilizing adapted cavity processing infrastructure already in place at Fermilab and Argonne. The processing recipes implemented for these structures will incorporate state-of-the art processing and cleaning techniques developed for 1.3 GHz SRF cavities for the ILC, XFEL, and LCLS-II projects. This paper describes the details of the processing recipes and associated chemistry, heat treatment, and cleanroom processes at the Fermilab and Argonne cavity processing facilities. This paper also presents single and multi-cell cavity test results with quality factors above 5·1010 and accelerating gradients above 30 MV/m. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR043  
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MOPLR048 Fabrication and Testing of a Novel S-Band Backward Travelling Wave Accelerating Structure for Proton Therapy Linacs linac, coupling, proton, accelerating-gradient 237
 
  • S. Benedetti, T. Argyropoulos, C. Blanch Gutiérrez, N. Catalán Lasheras, A. Degiovanni, D. Esperante Pereira, M. Garlaschè, J. Giner Navarro, A. Grudiev, G. McMonagle, A. Solodko, M.A. Timmins, R. Wegner, B.J. Woolley, W. Wuensch
    CERN, Geneva, Switzerland
  • D. Esperante Pereira
    IFIC, Valencia, Spain
  
  Compact and more affordable, facilities for proton therapy are now entering the market of commercial medical accelerators. At CERN, a joint collaboration between CLIC and TERA Foundation led to the design, fabrication and testing of a high gradient accelerating structure prototype, capable of halving the length of state-of-art light ion therapy linacs. This paper focuses on the mechanical design, fabrication and testing of a first prototype. CLIC standardized bead-pull measurement setup was used, leading to a quick and successful tuning of the prototype. The high power tests will soon start in order to prove that the structure can withstand a very high accelerating gradient while suffering no more than 10-6 breakdown per pulse per meter (bpp/m), resulting in less than one breakdown per treatment session.  
poster icon Poster MOPLR048 [2.804 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR048  
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MOPLR050 Study and Development of CW Room Temperature Rebuncher for SARAF Accelerator cavity, linac, impedance, acceleration 244
 
  • B. Kaizer, Z. Horvitz, A. Perry, J. Rodnizki
    Soreq NRC, Yavne, Israel
  • M. Di Giacomo, J.F. Leyge, M. Michel, P. Toussaint
    GANIL, Caen, France
  • A. Friedman
    Ariel University, Ariel, Israel
  
  The SARAF 176 MHz accelerator is designed to provide CW proton/deuteron beams up to 5 mA current and 40 MeV accelerated ion energy. Phase I of SARAF (up to 4-5 MeV) has been installed, commissioned, and is available for experimental work. Phase II of SARAF is currently in the planning stage and will contain larger MEBT with three rebunchers and four cryomodules, each consisting of SC HWRs and solenoids. Phase II MEBT line is designed to follow a 1.3 MeV/u RFQ, is 4.5 m long, and contains three 176 MHz rebunchers providing a field integral of 105 kV. Different rebuncher configurations have been studied in order to minimize the RF losses and maximize the shunt impedance. Different apertures have also been tested with a required of 40 mm diameter by beam dynamics. The simulations were done using CST Microwave Studio. CEA leads the design for SARAF phase II linac including the MEBT rebunchers and has studied a mixed solid copper and Cu plated stainless steel, 3-gap cavity. SNRC is developing a 4-gap OFHC copper rebuncher as a risk reduction. Both designs are presented and discussed in the paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR050  
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MOPLR063 Development of H0 Beam Diagnostic Line in MEBT2 of J-PARC Linac dipole, linac, diagnostics, experiment 277
 
  • J. Tamura, A. Miura, T. Morishita
    JAEA/J-PARC, Tokai-mura, Japan
  • H. Ao
    FRIB, East Lansing, USA
  • T. Maruta
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  • T. Miyao
    KEK, Ibaraki, Japan
  
  In the Japan Proton Accelerator Research Complex (J-PARC) linac, H0 particles arising from collisions of accelerated H− beams with residual gas are considered as one of the key factors of the residual radiation in the high energy accelerating section. To analyze the H0 and the accelerated H− particles, the bump magnet system was designed and produced. The H0 beam diagnostic line consists of four horizontal bending magnets, non-destructive beam position monitor and wire scan beam profile monitor. In the 2015 summer maintenance period of the J-PARC, the new diagnostic line was constructed in the beam transport (MEBT2), which is the matching section from separated-type drift tube linac (SDTL) to annular-ring coupled structure linac (ACS). In the beam commissioning, we experimentally confirmed that the accelerated 190 MeV H− beams are horizontally shifted as expected with the magnetostatic field simulation and the particle tracking simulation.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR063  
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MOPLR070 Integration of Interfaces and Stabilization System in the Design of a Drift Tube Linac DTL, simulation, interface, linac 294
 
  • R. De Prisco, A.R. Karlsson
    Lund University, Lund, Sweden
  • M. Eshraqi, Y.I. Levinsen, R. Miyamoto
    ESS, Lund, Sweden
  
  Making an accurate RF design of any accelerating structure is fundamental to ensure that electromagnetic and beam dynamics requirements will be achieved. This is essential for the most complicated accelerating structures like the drift tube linac: in this case a meticulous design facilitates the RF commissioning too. In this paper the influence of the interfaces and of the field stabilization system on the RF design is analyzed and an advanced design methodology to mitigate field degradation is presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR070  
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MOP106006 Electro-Mechanical Modeling of the LCLS-II Superconducting Cavities cavity, simulation, damping, linac 310
 
  • O. Kononenko, C. Adolphsen, Z. Li, T.O. Raubenheimer, C.H. Rivetta
    SLAC, Menlo Park, California, USA
  
  Funding: Work supported by the Department of Energy, Office of Science, Office of Basic Energy Science, under Contract No. DEAC0276SF00515
The 4 GeV LCLS-II superconducting linac will contain 280, 1.3 GHz TESLA-style cavities operated CW at 16 MV/m. Because of the low beam current, the cavity bandwidth will be fairly small, about 32 Hz, which makes the field stability sensitive to detuning from external vibrations and He pressure fluctuations. Piezo-electric actuators will be used to compensate for the detuning, which historically has been difficult at frequencies above a few Hz due to excitation of cavity mechanical resonances. To understand this interaction better, we have been doing extensive modeling of the cavities including mapping out the mechanical modes and computing their coupling to pressure changes, Lorentz forces and piezo actuator motion. One goal is to reproduce the measured detuning response of the piezo actuators up to 1 kHz, which is sensitive to how the cavities are constrained within a cryomodule. In this paper, we summarize these results and their implications for suppressing higher frequency detuning. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOP106006  
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TUPLR007 LCLS-II Cryomodules Production at Fermilab cryomodule, cavity, SRF, alignment 481
 
  • T.T. Arkan, C.J. Grimm, J.A. Kaluzny, Y.O. Orlov, T.J. Peterson, K. Premo
    Fermilab, Batavia, Illinois, USA
  
  Funding: US DOE
LCLS-II is an upgrade project for the linear coherent light source (LCLS) at SLAC. The LCLS-II linac will consist of thirty-five 1.3 GHz and two 3.9 GHz superconducting RF continuous wave (CW) cryomodules that Fermilab and Jefferson Lab (JLab) will assemble in collaboration with SLAC. The LCLS-II 1.3 GHz cryomodule design is based on the European XFEL pulsed-mode cryomodule design with modifications needed for CW operation. Fermilab and JLab will each assemble and test a prototype 1.3 GHz cryomodule to assess the results of the CW modifications, in advance of 16 and 17 production 1.3 GHz cryomodules, respectively. Fermilab is solely responsible for the 3.9 GHz cryomodules. After the prototype cryomodule tests are complete and lessons learned incorporated, both laboratories will increase their cryomodule production rates to meet the challenging LCLS-II project requirement of approximately one cryomodule per month per laboratory. This paper presents the Fermilab Cryomodule Assembly Facility (CAF) infrastructure for LCLS-II cryomodule production, the Fermilab prototype 1.3 GHz CW cryomodule (pCM) assembly and readiness for production assembly. 		 
poster icon Poster TUPLR007 [2.474 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR007  
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TUPLR010 Measurements and Analysis of Cavity Microphonics and Frequency Control in the Cornell ERL Main Linac Prototype Cryomodule cavity, linac, cryomodule, LLRF 488
 
  • M. Ge, N. Banerjee, J. Dobbins, R.G. Eichhorn, F. Furuta, G.H. Hoffstaetter, M. Liepe, P. Quigley, J. Sears, V. Veshcherevich
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  
  The Cornell Main Linac cryomodule (MLC) is a key component in the CBETA project. The SRF cavities with high loaded-Q in the MLC are very sensitive to microphonics from mechanical vibrations. Poor frequency stability of the cavities would dramatically increase the input RF power required to maintain stable accelerating fields in the SRF cavities. In this paper, we present detailed results from microphonics measurement for the cavities in the MLC, discuss dominant vibration sources, and show vibration damping results. The current microphonics level meets the CBETA requirement of a 36MeV energy gain without applying fast tuner compensation.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR010  
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TUPLR013 Lifetime Study of CKk2Sb Robust Photo-Cathode for a High Brightness Electron Source cathode, laser, electron, brightness 500
 
  • M. Kuriki, Y. Seimiya
    KEK, Ibaraki, Japan
  • L. Guo, K. Moriya, M. Urano, A. Yokota
    HU/AdSM, Higashi-Hiroshima, Japan
  • K. Negishi
    Iwate University, Morioka, Iwate, Japan
  
  CsK2Sb photo-cathode is one of the ideal cathode for accelerators requiring the high brightness electron beam. It can be driven with a green laser which can be generated as SHG from solid state laser. The QE (Quantum Efficiency) of photo-electron emission is as high as more than 10% with 532nm light. In this article, the robustness of the cathode is studied. Two indexes of lifetime regarding to time and extracted charge density were evaluated experimentally. The result shows that the cathode is robust enough for a high brightness accelerator.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR013  
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TUPLR017 Summary of the Test and Installation of 10 MW MBKs for the XFEL Project klystron, cathode, ion, linac 506
 
  • V. Vogel (Fogel), L. Butkowski, A. Cherepenko, S. Choroba, J. Hartung, V.V. Kachaev, R. Wagner, S. Wiesenberg
    DESY, Hamburg, Germany
  
  For the European XFEL project, horizontal multi-beam klystrons (MBK) which produce RF power up to 10 MW, at an RF frequency of 1.3 GHz, 1.5 ms pulse length and 10 Hz repetition rate, were chosen as RF power sources. All MBKs have been manufactured by two companies, 22 tubes from Thales Electron Devices and 7 tubes from Toshiba Electron Tubes & Devices. In this article we will give a summary of the tube testing, conditioning and installation in the underground linear accelerator tunnel.  
poster icon Poster TUPLR017 [1.975 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR017  
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TUPLR027 Magnetic Field Management in LCLS-II 1.3 GHz Cryomodules cavity, cryomodule, controls, shielding 527
 
  • S.K. Chandrasekaran, A. Grassellino, C.J. Grimm, 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.
The ambient magnetic field at the SRF cavity surface of the LCLS-II 1.3 GHz cryomodules is specified to be less than 0.5 μT (5 mG). Multiple methods were designed to lower the magnetic fields inside the prototype cryomodule. The resulting ambient magnetic field in this cryomodule just prior to its first cool down was <0.15 μT (1.5 mG), as measured using fluxgates inside and outside the cavity helium vessels. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR027  
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TUPLR030 First FRIB β=0.53 Prototype Coldmasss Build cavity, cryomodule, solenoid, SRF 538
 
  • D.R. Victory, K. Elliott, B. Oja, J.T. Popielarski, M.S. Wilbur
    FRIB, East Lansing, USA
  
  Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE SC0000661, the State of Michigan and Michigan State University.
The β=0.53 coldmass consists of eight Superconducting Radio Frequency (SRF) β=0.53 cavities, eight Fundamental mode Power Couplers (FPC), and one 8 T solenoid. This is the first coldmass with this version of cavity and it has brought new challenges to overcome. The Facility for Rare Isotope Beams (FRIB) contains 18 cryomodules with β=0.53 cavity coldmasses, and this type of coldmass is the highest power and most produced ones in FRIB. During the final cleaning stage and the cavity assembly, particle detection equipment is used to verify the cavity cleanliness levels for cavity certification test and for coldmass assembly. This method allows for cleanliness detection of specific areas inside the cavity at any time a vacuum flange is off. The fixtures, techniques and procedures used to build the β=0.53 coldmasses will be presented. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR030  
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TUPLR041 Manufacturing, Assembly and Tests of the LIPAc Medium Energy Beam Transport Line (MEBT) SRF, linac, controls, beam-transport 554
 
  • I. Podadera, P. Abramian, B. Brañas, J. Calero, J. Castellanos, J.M. García, D. Gavela, A. Guirao, J.L. Gutiérrez, D. Jiménez-Rey, M. Lafoz, D. López, L.M. Martínez, E. Molina Marinas, J. Mollá, C. Oliver, A. Soleto, F. Toral, R. Varela, V. Villamayor
    CIEMAT, Madrid, Spain
  • J. Castellanos
    UNED, Madrid, 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 and the project FIS2013-40860-R.
LIPAc* will be a 9 MeV, 125 mA CW deuteron accelerator which aims to validate the technology that will be used in the future IFMIF-DONES accelerator**. The acceleration of the beam will be carried out in two stages. An RFQ will increase the energy up to 5 MeV before a Superconducting RF (SRF) linac made of a chain of eight Half Wave Resonators bring the particles to the final energy. Between both stages, a Medium Energy Beam Transport line (MEBT)*** is in charge of transporting and matching the beam between the RFQ and the SRF. The transverse focusing of the beam is controlled by five quadrupole magnets with integrated steerers, grouped in one triplet and one doublet. Two buncher cavities surrounding the doublet handle the longitudinal dynamics. Two movable collimators are also included to purify the beam optics coming out the RFQ and avoid losses in the SRF. In this contribution, the final integrated design of the beamline will be shown, together with the auxiliaries. The manufacturing of all the components and the integration in the beamline will be depicted. The final tests carried out to the beamline prior to the installation in the accelerator will be also reported.
* P. Cara et al., IPAC16, to be published, Busan, Korea (2016).
** A. Ibarra et al., Fus. Sci. Tech., 66, 1, p. 252-259 (2014).
*** I. Podadera et al., IPAC11, San Sebastian, Spain (2011). 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR041  
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TUPLR056 Results of Operation of 162.5 MHz RFQ Couplers rfq, operation, cavity, multipactoring 584
 
  • S. Kazakov, J.P. Edelen, T.N. Khabiboulline, O.V. Pronitchev, J. Steimel
    Fermilab, Batavia, Illinois, USA
  
  Two couplers for RFQ of PXEI facility were designed and manufactured. Each coupler designed to deliver 50 KW, CW to RFQ at 162.5 MHz. Results of couplers operation are reported.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR056  
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TUPLR061 Cryomodule and Power Coupler for RIKEN Superconducting QWR cryomodule, cavity, linac, SRF 598
 
  • K. Ozeki, O. Kamigaito, H. Okuno, N. Sakamoto, K. Suda, Y. Watanabe, K. Yamada
    RIKEN Nishina Center, Wako, Japan
  • E. Kako, H. Nakai, K. Umemori
    KEK, Ibaraki, Japan
  • K. Okihira
    MHI, Hiroshima, Japan
  • K. Sennyu, T. Yanagisawa
    MHI-MS, Kobe, Japan
  
  In RIKEN Nishina Center, we are constructing a prototype of low-beta superconducting QWR for ions. Presently, the designs of cryomodule, which contains two QWRs, and power coupler are being carried out. In this contribution, the progress situation for the construction of cryomodule and power coupler will be reported. This work was funded by ImPACT Program of Council for Science, Technology and innovation (Cabinet Office, Government of Japan).  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR061  
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TUP106004 Status of RRR Analysis for RAON Accelerator niobium, cavity, SRF, superconductivity 628
 
  • Y. Jung, H. Kim, W.K. Kim
    IBS, Daejeon, Republic of Korea
  • J. Lee, J. Seo
    Vitzrotech Co., Ltd., Ansan City, Kyunggi-Do, Republic of Korea
  
  Residual resistance ratio (RRR) of 300-grade niobium has been analyzed to find optimal welding condition for a superconducting cavity. RRR values were not only measured along the welding directions, but also perpendicular to the welding lines. In this presentation, we will show the RRR analysis as a function of the distance, the welding speed, and the welding pressure.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUP106004  
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WE1A02 Assembly of XFEL Cryomodules: Lessons and Results cavity, cryomodule, controls, HOM 646
 
  • S. Berry, O. Napoly
    CEA/DSM/IRFU, France
  
  The industrialized string and module assembly of 103 European XFEL cryomodules has been performed at CEA-Saclay between September 2012 and the spring of 2016. The general features and achievements of this construction project will be reviewed, including lessons learned regarding organization, industrial transfer, quality control and assembly procedures. An overview of the cryomodule performance and RF test results will be presented.  
slides icon Slides WE1A02 [7.300 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-WE1A02  
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TH1A04 SARAF 4-Rods RFQ RF Power Line Splitting Design and Test rfq, operation, proton, coupling 693
 
  • J. Rodnizki, D. Hirschmann, Z. Horvitz, B. Kaizer, A. Perry, L. Weissman
    Soreq NRC, Yavne, Israel
  
  In the last years the SARAF 176 MHz 3.8 m long 4-rod RFQ accelerates routinely 2-4 mA CW proton beams to 1.5 MeV for basic studies in physics. However, it has not been successful in running CW deuteron beam for long periods. The findings imply that the RF coupler is the bottle neck to reach 250 kW CW dissipated power, equivalent to 65 kV inter-rod voltage, required to run the CW deuteron beam. A new design that splits the RFQ power between two couplers was built and commissioned successfully. A 3dB splitter and two new RF couplers were installed. The RF couplers improved design allows better brazing methods, vacuum properties and RF sealing. This design is innovative from two points of view: (a) implementation of two synchronized couplers located in two separated RF cells in a 4-rod RFQ. (b) The ability to run the RFQ in 200-250 kW to accelerate a 5 mA CW deuteron beam by 2.6 MV required for the new modulation design for 1.3 MeV/u. To our knowledge, SARAF RFQ will be the first 4-rod RFQ capable of running a CW deuteron beam at these power densities. This work may contribute to other 4-rod RFQ projects which intend to run CW beams in high dissipation power, like FRANZ and MYRRHA.  
slides icon Slides TH1A04 [6.109 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TH1A04  
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TH1A05 Towards Commissioning of the IFMIF RFQ rfq, linac, controls, impedance 698
 
  • A. Pisent
    INFN/LNL, Legnaro (PD), Italy
  
  All 18 sections of the IFMIF RFQ were completed in summer 2015. A 2 m section (the last three modules and one prototype used as RF termination) were RF tested at LNL at the design value of 90 kW/m in cw conditions. The three 3.3 m long supermodules were sent to Japan in January 2016. The RFQ was installed and tuned with fixed tuners to the nominal field frequency and field distribution. The very high design shunt impedance was achieved.  
slides icon Slides TH1A05 [23.395 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TH1A05  
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TH2A03 Complete Transverse 4D Beam Characterization for Ions Beams at Energies of Few MeV/u emittance, quadrupole, coupling, ion 720
 
  • M.T. Maier, X. Du, P. Gerhard, L. Groening, S. Mickat, H. Vormann
    GSI, Darmstadt, Germany
  
  Measurement of the ion beam rms-emittances is done through determination of the second order beam moments. For time being the moments quantifying the amount of inter-plane coupling, as <xy'> for instance, have been accessible to measurements just for very special cases of ions at energies below 200 keV/u using pepperpots. This talk presents successful measurements of all inter-plane coupling moments at 1 to 11 MeV/u. From first principles the used methods are applicable at all ion energies. The first campaign applied skewed quadrupoles in combination with a regular slit/grid emittance measurement device. The second campaign used a rotatable slit/grid device in combination with regular quadrupoles.  
slides icon Slides TH2A03 [17.343 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TH2A03  
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THPRC007 Development of 352.2 Mhz Power Coupler Window for R&D Purposes cavity, klystron, simulation, electron 779
 
  • F. Geslin, M. Chabot, J. Lesrel, D. Reynet
    IPN, Orsay, France
  • Ch.L. Lievin, S. Sierra
    TED, Velizy, France
  
  IPNO and Thales are conducting power couplers research and development. This paper present a new window design that fulfills European Spallation Source (ESS) requirements (400 kW RF peak power). The results of electromagnetic, thermal, thermo-mechanical, multipacting simulations and the consequences of the new ceramic window of power coupler will be reported. The multipacting simulations were performed with Musicc3D, software developed by IPNO. The new design overcome ceramic's weakness in tension and allows stronger constraints in the power coupler window.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPRC007  
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THPRC013 Design of a FRIB Half-Wave Pre-Production Cryomodule linac, cryogenics, alignment, solenoid 795
 
  • S.J. Miller, H. Ao, B. Bird, G.D. Bryant, B. Bullock, N.K. Bultman, F. Casagrande, C. Compton, A. Facco, W. Hartung, J.D. Hulbert, D.G. Morris, P.N. Ostroumov, J.T. Popielarski, L. Popielarski, M.A. Reaume, K. Saito, M. Shuptar, J. Simon, S. Stark, B.P. Tousignant, J. Wei, J.D. Wenstrom, K. Witgen, T. Xu, Z. Zheng
    FRIB, East Lansing, USA
  • A. Facco
    INFN/LNL, Legnaro (PD), Italy
  • M.P. Kelly
    ANL, Argonne, Illinois, USA
  
  Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE SC0000661.
The driver linac for the Facility for Rare Isotope Beams (FRIB) will require the production of 48 cryomodules (CMs). In addition to the β=0.085 quarter-wave CM, FRIB has completed the design of a β=0.53 half-wave CM as a pre-production prototype. This CM will qualify the performance of the resonators, fundamental power couplers, tuners, and cryogenic systems of the β=0.53 half-wave design. In addition to the successful systems qualification; the β=0.53 CM build will also verify the FRIB bottom up assembly and alignment method on a half-wave CM type. The lessons learned from the β=0.085 pre-production CM build including valuable fabrication, sourcing, and assembly experience have been applied to the design of β=0.53 half-wave CM. This paper will report the design of the β=0.53 half-wave CM as well as the CM interfaces within the linac tunnel. 		 
poster icon Poster THPRC013 [0.954 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPRC013  
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THPRC016 Assembling Experience of the First Two HIE-ISOLDE Cryomodules cavity, linac, ion, status 805
 
  • M. Therasse, G. Barlow, S. Bizzaglia, O. Capatina, A. Chrul, P. Demarest, J-B. Deschamps, J. Gayde, M. Gourragne, A. Harrison, G. Kautzmann, Y. Leclercq, D. Mergelkuhl, T. Mikkola, A. Miyazaki, V. Parma, J.A.F. Somoza, M. Struik, S. Teixeira L'pez, W. Venturini Delsolaro, L.R. Williams, P. Zhang
    CERN, Geneva, Switzerland
  • J. Dequaire
    Intitek, Lyon, France
  
  The assembly of the first two cryomodules (CM1 and CM2) of the new superconducting linear accelerator HIE-ISOLDE (High Intensity and Energy ISOLDE), located downstream of the REX-ISOLDE normal conducting accelerator, started one year and half ago. After a delicate assembly phase in the cleanroom which lasted nine months, the first cryomodule was transported to the ISOLDE hall on 2 May 2015 and coupled to the existing REX-ISOLDE accelerator, increasing the energy of the radioactive ion beams from 2.8 to 4.3 MeV per nucleon. The superconducting linac supplied the CERN-ISOLDE Facility, with radioactive zinc ions until the end of the proton run in November 2015. At the beginning of 2016, the second cryomodule was installed in the machine, increasing the energy to 5.5 MeV per nucleon. During commissioning of the first cryomodule in summer 2015, it was found that the performance of the RF superconductive cavities was limited by the over-heating of their RF couplers. The decision was taken to refurbish CM1 and reinstall it at the end of April. In this paper, we present the challenges faced and the experience gained with the cleanroom assembly of the first two cryomodules, especially the construction of the SC RF cavities and their RF ancillaries.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPRC016  
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THPRC024 Polarity Check of the FRIB Cryomodule Solenoids by Measuring Leakage Magnetic Field solenoid, cryomodule, dipole, linac 821
 
  • H. Ao, D. Luo, F. Marti, K. Saito, S. Shanab
    FRIB, East Lansing, USA
  
  Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE SC0000661.
We observed the outside magnetic field of the first β=0.085 production cryomodule while a solenoid and steering dipoles are under operation. This measurement aims to check the polarity on these magnets after the final installation in the accelerating tunnel. This paper also shows the residual magnetic field variation through the degaussing process of these magnets. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPRC024  
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THPRC028 Deflector Design for Spin Rotator in Muon Linear Accelerator dipole, simulation, solenoid, experiment 830
 
  • S. Artikova
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • Y. Kondo
    JAEA, Ibaraki-ken, Japan
  • T. Mibe, M. Otani
    KEK, Tsukuba, Japan
  
  A muon g-2/EDM experiment based on muon linear accelerator was proposed for the J-PARC muon facility. In this experiment, the ultra-slow muons created in muonium target region will be accelerated to 210 MeV kinetic energy then will be injected into the muon storage ring to measure the decay products depending on the muon spin. Therefore, a spin rotator (device) is a key component of the muon linac. Spin rotator consists of a pair of combined electrostatic and magnetic deflectors and a pair of solenoids which will be placed in between these two deflectors. In this paper, we report the design of these two dispersion-free deflectors and the simulation results of the device performance will be discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPRC028  
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THPRC030 Plasma Window as Charge Stripper Complement plasma, ion, electron, interface 836
 
  • A. Lajoie
    NSCL, East Lansing, Michigan, USA
  • A. Hershcovitch, P. Thieberger
    BNL, Upton, Long Island, New York, USA
  • F. Marti
    FRIB, East Lansing, USA
  
  Funding: NSF Cooperative Agreement, Award No. PHY-1102511
Modern ion accelerators, particularly heavy ion accelerators, almost universally make use of charge stripping. A challenge facing facilities, as the demand for higher intensity beams rises, is a stripping media that's highly resistant to degradation, such as a recirculating He gas stripper. A method of keeping the He gas localized in a segment along the beamline by means of a Plasma Window (PW) positioned on both sides of the gas stripper has been proposed and the initial design set forth by Ady Hershcovitch. With a cascaded plasma arc being the interface between high pressure stripper and low pressure beamline, the goal is to minimize gas flowrate from the stripper to the beamline in order to maintain sufficient isolation of the He gas. We present the initial results from the test stand developed at Michigan State University and the planned experimental program that will follow. 		 
poster icon Poster THPRC030 [0.626 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPRC030  
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THPRC031 Manufacturing of MEBT Combined Quadrupole & Steerer Magnets for the Linear IFMIF Prototype Accelerator LIPAC quadrupole, radiation, factory, beam-transport 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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THPLR004 Development of 1.3 Ghz Single-Cell Superconducting Cavities With Nb Material Developed by Ulba Metallurgical Plant cavity, accelerating-gradient, niobium, radiation 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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THPLR023 The ARIEL Radioactive Ion Beam Transport System ISAC, target, TRIUMF, ion 891
 
  • M. Marchetto, T.J. Alderson, F. Ames, R.A. Baartman, J.D. Chak, P.E. Dirksen, T.G. Emmens, G.W. Hodgson, T. Hruskovec, M. Ilagan, R.E. Laxdal, N. Muller, D. Preddy, D. Rowbotham, S. Saminathan, Q. Temmel, V.A. Verzilov, D. Yosifov
    TRIUMF, Vancouver, Canada
  
  The Advanced Rare IsotopE Laboratory (ARIEL) is going to triple the radioactive ion beam (RIB) production at TRIUMF. The facility will enable multi-user capability in the Isotope Separation and ACceleration (ISAC) facility by delivering three RIBs simultaneously. Two new independent target stations will generate RIBs using a proton driver beam up to 50 kW from the 500 MeV cyclotron and an electron driver beam for photo-fission from the new superconducting e-linac in addition to the existing ISAC RIB production. The multi-user capability is enabled by a complex radioactive ion beam transport switchyard consisting entirely of electrostatic optics. This system includes two separation stages at medium and high resolution with the latter achieved by a mass separator designed for an operational resolving power of 20000 for a 3 micrometer transmitted emittance. Part of the system also includes an Electron Beam Ion Source (EBIS) charge breeder fed by a radio frequency cooler that allows the post-acceleration of heavy masses. Beam selection downstream of the EBIS is achieved by means of a Nier type separator. The facility is in a detailed design stage and some tests, procurements and partial installation are foreseen by the end of 2016.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR023  
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THPLR027 Progress Towards a 2.0 K Half-Wave Resonator Cryomodule for Fermilab's PIP-II Project cryomodule, cavity, linac, SRF 906
 
  • Z.A. Conway, A. Barcikowski, G.L. Cherry, R.L. Fischer, B.M. Guilfoyle, C.S. Hopper, M. Kedzie, M.P. Kelly, S.H. Kim, S.W.T. MacDonald, P.N. Ostroumov, T. Reid
    ANL, Argonne, Illinois, USA
  • V.A. Lebedev, A. Lunin
    Fermilab, Batavia, Illinois, USA
  
  Funding: This material is supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics and Office of High-Energy Physics, Contracts No. DE-AC02-76-CH03000 and DE-AC02-06CH11357.
In support of Fermilab's Proton Improvement Plan-II project Argonne National Laboratory is constructing a superconducting half-wave resonator cryomodule. This cryomodule is designed to operate at 2.0 K, a first for low-velocity ion accelerators, and will accelerate ≥1 mA proton/H− beams from 2.1 to 10.3 MeV. Since 2014 the construction of 9 162.5 MHz b = 0.112 superconducting half-wave resonators, the vacuum vessel and the majority of the cryomodule subsystems have been finished. Here we will update on the status of this work and report on preliminary cavity test results. This will include cavity performance measurements where we found residual resistances of < 3 nanoOhms at low fields and peak voltage gains of 5.9 MV, which corresponds to peak surface fields of 134 MV/m and 144 mT electric and magnetic respectively. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR027  
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THPLR036 SRF Low-Beta Elliptical Resonator Two-Ring Stiffening cavity, simulation, SRF, resonance 929
 
  • E.N. Zaplatin
    FZJ, Jülich, Germany
  • I.V. Gonin, T.N. Khabiboulline, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
  
  Elliptical SRF cavities are the basic accelerating structures for the high energy part of many accelerators. Since a series of external loads on the resonator walls predetermine the main working conditions of the SC cavities the detailed investigation of their mechanical properties should be conducted in parallel with the main RF design. The effects of very high electromagnetic fields that result in strong Lorentz forces and the pressure on cavity walls from the helium tank that also deforms the cavity shape, the tuning scheme resulting in the change of accelerating field profile and mechanical eigen resonances of cavities which are the main source of the microphonics must be taken into account during integrated design of the resonator and its liquid helium vessel. SRF elliptical cavities for the medium energies (β=v/c is around 0.6) inherently have more flexible shape and their ultimate stiffening with a "standard" stiffening rings installed between resonator cells becomes problematic. The second row of the rings should enhance the overall cavity rigidity. In the paper we report the basic investigations of the cavity two-row ring stiffening using FNAL 650 MHz β=0.61 as an example. The single-cell investigation results were used as the reference to develop the ultimate scheme of the helium vessel structure to ensure the best resonator stability.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR036  
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THPLR049 Tuning the IFMIF 5MeV RFQ Accelerator rfq, dipole, insertion, target 969
 
  • A. Palmieri, F. Grespan, A. Pisent
    INFN/LNL, Legnaro (PD), Italy
  
  In order to allow proper operation of the IFMIF RFQ, it is necessary to perform a campaign of RF measurements on the cavity aimed, on one hand, at determining the basic RF parameters (frequency, Q0, etc.), on the other hand at verifying the fulfilment of the voltage law within the specified admitted range (±2% target value, ±4% acceptance value) of any of the perturbative components upon successive tuner settings as predicted by the tuner algorithm. These measurements also involve the determination of the proper depth of the end plates and the positioning and length of the Dipole Stabilizers (if any). In this contribution the tuning procedure and the results of such measurements will be presented for the case of the IFMIF RFQ will be described.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR049  
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THPLR051 High-Power RF Test of IFMIF-EVEDA RFQ at INFN-LNL rfq, cavity, controls, operation 975
 
  • E. Fagotti, L. Antoniazzi, M.G. Giacchini, F. Grespan, M. Montis, A. Palmieri
    INFN/LNL, Legnaro (PD), Italy
  
  A partial test at full power and CW duty cycle will be performed at INFN-LNL on the last elements of the IFMIF RFQ, approximately two meters of structure, using a specific electromagnetic boundary element on the low energy end. The aim is to reach, in the RFQ coupled with its power coupler system, after an adequate period of conditioning, cw operation at nominal field level (132 kV between electrodes) for at least two hours without breakdown. The description of the experimental setup and procedure, as well as the main results of the conditioning procedure will be reported in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR051  
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THPLR054 Recent RF and Mechanical Developments for the ESS RFQ rfq, cavity, operation, simulation 978
 
  • N. Misiara, A. Albéri, G. Bourdelle, A.C. Chauveau, D. Chirpaz-Cerbat, M. Desmons, A.C. France, M. Lacroix, P.-A. Leroy, J. Neyret, G. Perreu, O. Piquet, B. Pottin, H. Przybilski, N. Sellami
    CEA/IRFU, Gif-sur-Yvette, France
  
  The ESS Radio-Frequency Quadrupole (RFQ) is a 4-vane resonant cavity designed at the frequency of 352.21 MHz frequency. It must accelerate and bunch a 70 mA proton beams from 75 keV to 3.62 Mev of energy with a 4% duty cycle. The current 3D design evolved and is currently divided in 5 segments for a total length of 4.54 m. This paper presents a complete radiofrequency (RF) analysis using the ANSYS Multiphysics 3D RF simulating code HFSS and a RFQ 4-wire transmission line model (TLM). It describes the integrated cooling strategy based on a coupling between the RF power losses and the thermo-mechanical physics in order to allow a proper RFQ tuning once under operation.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR054  
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THPLR060 Experience with the Conditioning of Linac4 RF Cavities cavity, linac, DTL, coupling 985
 
  • S. Papadopoulos, F. Gerigk, J.-M. Giguet, J. Hansen, J. Marques Balula, A.I. Michet, S. Ramberger, N. Thaus, R. Wegner
    CERN, Geneva, Switzerland
  
  Linac4, the future H− injector of the PS complex at CERN has reached the hardware and beam commissioning phase. This paper summarizes the experience gained in RF conditioning of the DTL, CCDTL and PIMS cavities. The behaviour in conditioning of these cavities strongly depends on the cavity type and assembly conditions. Examples of conditioning history and vacuum measurements before, during and after conditioning are discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR060  
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THPLR066 Preparation and Installation of IFMIF-EVEDA RFQ at Rokkasho Site rfq, alignment, cavity, coupling 1005
 
  • E. Fagotti, L. Antoniazzi, A. Baldo, A. Battistello, P. Bottin, L. Ferrari, M.G. Giacchini, F. Grespan, M. Montis, A. Pisent, D. Scarpa
    INFN/LNL, Legnaro (PD), Italy
  • D. Agguiaro, A.G. Colombo, A. Pepato, L. Ramina
    INFN- Sez. di Padova, Padova, Italy
  • F. Borotto Dalla Vecchia, G. Dughera, G. Giraudo, E.A. Macri, P. Mereu, R. Panero
    INFN-Torino, Torino, Italy
  
  The IFMIF-EVEDA RFQ is composed of 18 modules for a total length of 9.8 m and is designed to accelerate the 125 mA D+ beam up to 5 MeV at the frequency of 175 MHz. The RFQ is subdivided into three Super-Modules of six modules each. The Super-Modules were pre-assembled, aligned and vacuum tested at INFN-LNL and then shipped to Rokkasho (Japan). At Rokkasho site a series of test were performed in order to verify the effect of the shipment on the cavity. The assembly debug, shipment equipment and the sequence of operations are described in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR066  
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THPLR074 N-Doped Niobium Accelerating Cavities: Analyzing Model Applicability niobium, electron, cavity, embedded 1014
 
  • R.G. Eichhorn, N.A. Stilin
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  • W. Weingarten
    CERN, Geneva, Switzerland
  
  So-called Nitrogen-doped cavities show a rather strange field dependent behavior of the surface resistance. We had come up with a rather straightforward two fluid model description of the Q-slope in the low and high field domains in an earlier publication based on one dataset of a cavity. In this contribution we report on successfully applying this model to other cavity performance data as well as cases were the model fails.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR074  
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