Keyword: cryomodule
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MOIOB01 Early Commissioning Experience and Future Plans for the 12 GeV Continuous Electron Beam Accelerator Facility linac, operation, cavity, SRF 11
 
  • M. Spata
    JLab, Newport News, Virginia, USA
  
  Jefferson Lab has recently completed the accelerator portion of the 12 GeV Upgrade for the Continuous Electron Beam Accelerator Facility. All 52 SRF cryomodules have been commissioned and operated with beam. The initial beam transport goals of demonstrating 2.2 GeV per pass, greater than 6 GeV in 3 passes to an existing experimental facility and greater than 10 GeV in 5-1/2 passes have all been accomplished. These results along with future plans to commission the remaining beamlines and to increase the performance of the accelerator to achieve reliable, robust and efficient operations at 12 GeV are presented.  
slides icon Slides MOIOB01 [2.754 MB]  
 
MOIOC01 Status of Superconducting Electron Linac Driver for Rare Ion Beam Production at TRIUMF cavity, linac, electron, TRIUMF 31
 
  • R.E. Laxdal, F. Ames, R.A. Baartman, I.V. Bylinskii, Y.-C. Chao, D. Dale, K. Fong, E.R. Guetre, P. Kolb, S.R. Koscielniak, A. Koveshnikov, M.P. Laverty, Y. Ma, M. Marchetto, L. Merminga, A.K. Mitra, N. Muller, R.R. Nagimov, T. Planche, W.R. Rawnsley, V.A. Verzilov, Z.Y. Yao, Q. Zheng, V. Zvyagintsev
    TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
  
  A MW class cw superconducting electron linac is being installed at TRIUMF as a driver for radioactive beam production through photo-fission. The ARIEL e-linac will house five 1.3GHz nine-cell cavities in three cryomodules and accelerate up to 10mA of electrons to 50MeV. A first phase of installation will see three cavities in two cryomodules installed by the end of 2014. Presently the injector cryomodule is installed and undergoing cryogenic and rf characterizations and beam acceleration tests with beam from the 300kV DC gun. The second cryomodule is being prepared for first tests. The linac status including descriptions and operating performance of installed cryogenic and rf systems, electron gun performance, cryomodule performance and the results of first beam acceleration tests will be reported.  
slides icon Slides MOIOC01 [6.383 MB]  
 
MOPP001 First Experimental Results for the Superconducting Half-Wave Resonators for PXIE cavity, niobium, proton, accelerating-gradient 46
 
  • Z.A. Conway, A. Barcikowski, G.L. Cherry, R.L. Fischer, S.M. Gerbick, M. Kedzie, M.P. Kelly, S.H. Kim, S.W.T. MacDonald, R.C. Murphy, P.N. Ostroumov, T. Reid, K.W. Shepard
    ANL, Argonne, Illinois, USA
  
  Funding: This work was supported by the U.S. Department of energy, Offices of High-Energy Physics and Nuclear Physics, under Contract No. DE-AC02-76-CH03000 and DE-AC02-06CH11357.
The first pair of superconducting niobium half-wave resonators operating at 162.5 MHz for the FNAL PIP-II project are complete and this poster reports the cold test results. These cavities are optimized to accelerate protons/H− from 2 to 10 MeV and build upon optimized electromagnetic designs and processing techniques developed at Argonne for the Intensity Upgrade of the ATLAS superconducting heavy ion accelerator. 		 
 
MOPP003 A Compact Linac Design for an Accelerator Driven System linac, cavity, lattice, focusing 52
 
  • B. Mustapha, S.V. Kutsaev, J.A. Nolen, P.N. Ostroumov
    ANL, Argonne, USA
  
  Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357.
A compact linac design has been developed for an Accelerator Driven System (ADS). The linac is under 150 meters in length and comprises a radio-frequency quadrupole (RFQ) and 20 superconducting modules. Three types of half-wave cavities and two types of elliptical cavities have been designed and optimized for high performance at frequencies of 162.5, 325 and 650 MHz. The lattice is being designed and optimized for operation with a peak power of 25 MW for a 25 mA – 1 GeV proton beam. The cavities RF design as well as the linac lattice will be presented along with end-to-end beam dynamics simulations for beam currents ranging from 0 to 25 mA. 		 
 
MOPP017 Cool Down and Flux Trapping Studies on SRF Cavities cavity, SRF, linac, operation 84
 
  • D. Gonnella, M. Liepe
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  
  Recent results from Cornell and FNAL have shown that cool down rate can have a strong impact on the residual resistance of a superconducting RF cavity during operation. We have studied the effect of cool down rate, gradient, and external magnetic field during cool down on the residual resistance of an EP, EP+120C baked, and nitrogen-doped cavities. For each cavity, faster cool down and large gradient resulted in lower residual resistance in vertical test. The nitrogen-doped cavities showed the largest improvement with fast cool down, while the EP+120C cavity showed the smallest. The cavities were also placed in a uniform external magnetic field and residual resistance was measured as a function of applied field and cool down rate. We show that the nitrogen-doped cavity was the most susceptible to losses from trapped flux and the EP+120C cavity was least susceptible. These measurements provide new insights into understanding the physics behind the observed impact of cool down rates and gradients on the performance of cavities with differing preparations.  
 
MOPP018 Nitrogen-Doped 9-Cell Cavity Performance in the Cornell Horizontal Test Cryomodule cavity, SRF, radiation, linac 88
 
  • D. Gonnella, R.G. Eichhorn, F. Furuta, G.M. Ge, D.L. Hall, Y. He, G.H. Hoffstaetter, M. Liepe, T.I. O'Connel, S. Posen, P. Quigley, J. Sears, V. Veshcherevich
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  • A. Grassellino, A. Romanenko
    Fermilab, Batavia, Illinois, USA
  
  Funding: U.S. Department of Energy
Cornell has recently completed construction and qualification of a horizontal cryomodule capable of holding a 9-cell ILC cavity. A nitrogen-doped niobium 9-cell cavity was assembled into the Horizontal Test Cryomodule (HTC) with a high Q input coupler and tested. We report on results from this test of a nitrogen-doped cavity in cryomodule and discuss the effects of cool down rate and thermal cycling on the residual resistance of the cavity. 		 
 
MOPP020 Input Couplers for Cornell ERL linac, coupling, cavity, impedance 95
 
  • R.G. Eichhorn, P. Quigley, V. Veshcherevich
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  • S.A. Belomestnykh
    BNL, Upton, Long Island, New York, USA
  
  Cornell has developed two types of input couplers for the Energy Recovery Linac (ERL) Project. Both couplers are 1.3 GHz CW coaxial couplers. The coupler for ERL injector is a 65 kW CW coupler with variable coupling (Qext = 9*E4 to 9*E5). The coupler for ERL main linac is a 5 kW CW coupler with fixed coupling. It can be easily modified for variable coupling operation. Couplers have been tested on test stands and in cryomodules and showed good performance.  
 
MOPP021 XFEL Cryomodule Transportation: from the Assembly Laboratory in CEA-Saclay (France) to the Test-Hall in DESY-Hamburg (Germany) acceleration, damping, site, monitoring 98
 
  • S. Barbanotti, K. Jensch, W. Maschmann, O. Sawlanski
    DESY, Hamburg, Germany
  
  The one hundred, 12 m long XFEL 1.3 GHz cryomodules are assembled at CEA Saclay (F) and have therefore to be transported, fully assembled, to the installation site in DESY Hamburg (D). Various studies and tests have been performed to assess and minimize the risk of damages during transportation; a new transport frame and a specialised company are being used for the series transportation. This paper resumes the studies performed, describes the final configuration adopted for the series transportation and the results obtained for the first XFEL modules.  
 
MOPP026 Actively Cooled RF Power Coupler : Theoretical and Experimental Studies cryogenics, cavity, proton, linac 111
 
  • R. Bonomi, V. Parma
    CERN, Geneva, Switzerland
  
  In cryostats for Super-conducting Radio Frequency Cavities, the heat loads introduced by the high-power RF couplers represent an important fraction of the overall static thermal budget. Working at low operating temperature benefits from a reduced surface resistance (low dynamic losses) but is penalized by the high refrigeration cost. The external conductor of RF coaxial couplers provides a direct conduction path from ambient to cryogenic temperature plus is heated by resistive power deposition. Heat interception is therefore essential to contain heat in-leaks: a double-walled external conductor with a properly designed gas cooling effectively reduces heat loads to the cold bath by 1 order of magnitude. This paper presents the thermal design of the RF power coupler of the Superconducting Proton Linac (SPL) at CERN, featuring a helium vapour cooling between 4.5 K and ambient temperature. Numerical models, which can be used as design tools for other applications, have been developed to assess efficiency and thermal performance. A full-size mock-up cooled by nitrogen has been built for experimental validation. Comparison between calculations and measurements is presented and discussed.  
 
MOPP036 Estimation of the Thermal Load and Signal Level of the ESS Wire Scanner linac, DTL, detector, photon 137
 
  • B. Cheymol
    ESS, Lund, Sweden
  
  The European Spallation Source (ESS), to be built in the south of Sweden, will use a 2 GeV superconducting linac to produce the worlds most powerful neutron source with a beam power of 5 MW. A number of wire scanners will be used to characterize the beam transverse profile. The design of the wire has to cope with the high power density of the beam and must satisfy the overall measurement robustness, accuracy and sensitivity for the commissioning and the regular retuning phase of the ESS linac. This paper describes the preliminary design of the wire scanner system in the normal conducing linac as well as in the superconducting linac.  
 
MOPP041 Commissioning Plan for the FRIB Driver Linac* linac, radiation, ion, operation 152
 
  • M. Ikegami, L.T. Hoff, S.M. Lidia, F. Marti, G. Pozdeyev, T. Russo, R.C. Webber, J. Wei, Y. Yamazaki
    FRIB, East Lansing, Michigan, USA
  
  Funding: * Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661.
The FRIB driver linac accelerates CW beams of all stable ions up to uranium to the energy of 200 MeV/u with the beam power of 400 kW. We plan to start staged beam commissioning in December 2017 in parallel with ongoing installation activities. This allows early recognition of technical issues, which is essential for smooth commissioning and early completion of commissioning goals. As the interlaced nature of commissioning and installation poses both scheduling challenges and special safety issues, it is essential to develop a commissioning plan with focused consideration of each. In this paper, we present a commissioning plan with emphasis on its characteristic features. 		 
 
MOPP044 MSU RE-Accelerator ReA3 0.085 QWR Cryomodule Status cavity, solenoid, alignment, linac 155
 
  • T. Xu, B. Bird, F. Casagrande, J.L. Crisp, K.D. Davidson, C. Dudley, A. Facco, P.E. Gibson, I. Grender, L. Hodges, K. Holland, M.J. Johnson, S. Jones, B. Laumer, D. Leitner, A. Mccartney, S.J. Miller, D. Morris, S. Nash, J.P. Ozelis, J. Popielarski, L. Popielarski, R. Rosas, R.J. Rose, K. Saito, M. Thrush, R. Walker, J. Wei, W. Wittmer, Y. Xu
    FRIB, East Lansing, Michigan, USA
  • B. Arend, J. Ottarson, D.P. Sanderson, D. Wahlquist, J. Wenstrom
    NSCL, East Lansing, Michigan, USA
  • M. Leitner
    LBNL, Berkeley, California, USA
  
  ReA3 β=0.085 QWR cryomodule is the third cryomodule for the superconducting LINAC of ReA3 reaccelerated beam facility, which will bring the maximum beam energy to 3 MeV/u for heavy ions. This cryomodule consists of 8 β=0.085 QWR cavities and 3 9T superconducting solenoids and operates at 4K. Qualification of cavities and FPCs and the construction of cold mass was completed in 2013. The installation of the module was completed this summer. Functioning not only as an important part of the ReA3 facility, cryomodule 3 also serves as a test bed for FRIB driver Linac and demonstrated the technology needed for FRIB CMs. Here we report the construction, installation and testing of the β=0.085 cryomodule and the development of the critical components.
Project funded by Michigan State University 		 
 
MOPP045 Progress and Plan of Open XAL Physics Application for FRIB linac, solenoid, database, software 158
 
  • Y. Zhang, P. Chu, D.G. Maxwell
    FRIB, East Lansing, Michigan, USA
  
  Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
FRIB driver linac will deliver heavy ion beams with beam energy above 200 MeV/u, and beam power on target up to 400 kW. Commissioning, tuning, and beam power ramping up of the world’s first SRF linac for high-power heavy-ion beams will be challenge, and developments of necessary physics application software tools are very important. In this paper, our major progress and the development plan of physics application software for the FRIB linac within Open XAL frameworks are discussed, which include the FRIB linac online model, MySQL database for physics applications, virtual accelerator application, and several other pilot physics applications. Deploying and initial testing of Open XAL and those pilot applications for FRIB are currently ongoing for a new cryomodule at Michigan State University. 		 
 
MOPP049 Dipole Kick due to Geometry Asymmetries in HWR for PXIE cavity, dipole, multipole, linac 165
 
  • P. Berrutti, T.N. Khabiboulline, V.A. Lebedev, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
  
  Funding: Work supported by D.O.E. Contract No. DE-AC02-07CH11359
Project X Injector Experiment (PXIE) will have a family of half wave resonators having frequency=162.5 MHz and beta optimal=0.11. During cavity production, when the niobium parts are assembled and welded together, it is fundamental to control the frequency of the accelerating mode in order to meet the specified operating value. For the HWR of PXIE the tuning will be achieved by trimming one end of the resonator only, this will introduce unwanted asymmetry in the cavity geometry leading to a dipole kick for the particles traveling through the cavity. The cavity geometry will be different from the ideal, once the cavity is assembled, because of small misalignment of the niobium parts and because of the welding shrinkage. Misalignments of the inner conductor and the beam pipes can be expected. The asymmetry due to tuning process along with production misalignments, have been simulated and the equivalent dipole kick has been calculated. 		 
poster icon Poster MOPP049 [1.441 MB]  
 
MOPP082 Superconducting Linac for RISP linac, cavity, ion, quadrupole 245
 
  • H.J. Kim, H.J. Cha, M.O. Hyun, H.C. Jung, Y.J.K. Kim, M. Lee
    IBS, Daejeon, Republic of Korea
  
  The RISP (Rare Isotope Science Project) has been proposed as a multi-purpose accelerator facility for providing beams of exotic rare isotopes of various energies. It can deliver ions from proton to Uranium. Proton and Uranium beams are accelerated upto 600 MeV and 200 MeV/u respectively. The facility consists of three superconducting linacs of which superconducting cavities are independently phased. Requirement of the linac design is especially high for acceleration of multiple charge beams. In this paper, we present the RISP linac design, the prototyping of superconducting cavity and cryomodule.  
 
MOPP103 Fault Tolerance and Consequences in the MYRRHA Superconducting Linac linac, cavity, operation, simulation 297
 
  • F. Bouly
    LPSC, Grenoble Cedex, France
  • J.-L. Biarrotte
    IPN, Orsay, France
  • D. Uriot
    CEA/DSM/IRFU, France
  
  Funding: This work is being supported by the European Atomic Energy Community’s EURATOM) Seventh Framework Programme under grant agreement n°269565(MAX project).
The MYRRHA project aims at the construction of new irradiation complex in Mol (Belgium) to demonstrate the transmutation feasibility with an Accelerator Driven System (ADS). In its subcritical configuration, the MYRRHA facility requires a proton flux with a maximum power of 2.4 MW (600 MeV - 4 mA). Such a continuous wave beam will be delivered by a superconducting linac which must fulfil very stringent reliability requirements to ensure the safe ADS operation with a high level of availability. In this purpose, the accelerator design is based on a redundant and fault-tolerant scheme to enable rapid failures mitigations. Beam dynamics studies on the fault tolerance capability of the MYRRHA superconducting linac will be presented. The results will be mainly focused on RF failure compensation scenarios: when one or several superconducting cavities are lost in the linac. The impact on the R&D to enable fast retuning procedures in the linac will also be discussed. 		 
 
MOPP114 SNS Linac Upgrade Plans for the Second Target Station linac, klystron, cavity, rfq 320
 
  • J. Galambos, D.E. Anderson, M.P. Howell, S.-H. Kim, M.A. Plum, A.P. Shishlo
    ORNL, Oak Ridge, Tennessee, USA
  • M.E. Middendorf
    ORNL RAD, Oak Ridge, Tennessee, USA
  
  Funding: ORNL is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy.
The Second Target Station (STS) upgrade for the Spallation Neutron Source (SNS) proposes the addition of a short pulse, long wavelength neutron scattering station. In order to provide world-class intensity at the additional station, the SNS linac beam power capability is doubled, to 2.8 MW. This will be accommodated by a 30% increase in the beam energy to 1.3 GeV and a 50% increase in beam current. The beam energy increase will be provided by the addition of 7 additional cyro-modules and supporting RF equipment in space provided during the original SNS construction. The beam current increase will be provided by improved ion source and a reduced chopping fraction, and will require increases in the RF and high voltage modulator systems to accommodate the additional beam loading. Initial plans will be presented. The proposed linac upgrade path will be described. 		 
 
MOPP126 Untrapped HOM Radiation Absorption in the LCLS-II Cryomodules HOM, cavity, impedance, linac 351
 
  • K.L.F. Bane, C. Adolphsen, C.D. Nantista, T.O. Raubenheimer
    SLAC, Menlo Park, California, USA
  • A. Saini, N. Solyak, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
  
  Funding: Work supported by Department of Energy contract DE–AC02–76SF00515.
The superconducting cavities in the continuous wave (CW) linacs of LCLS-II are designed to operate at 2 K, where cooling costs are very expensive. One source of heat is presented by the higher order mode (HOM) power deposited by the beam. Due to the very short bunch length-especially in L3 the final linac-the LCLS-II beam spectrum extends into the terahertz range. Ceramic absorbers, at 70 K and located between cryomodules, are meant to absorb much of this power. In this report we perform two kinds of calculations to estimate the effectiveness of the absorbers and the amount of beam power that needs to be removed at 2 K. 		 
 
TUIOA04 The New LCLS-II Project : Status and Challenges linac, electron, undulator, operation 404
 
  • J.N. Galayda
    SLAC, Menlo Park, California, USA
  
  The LCLS-II was an upgrade of the LCLS which essentially replicated the LCLS in another tunnel using the middle 1/3 of the SLAC S-band linac. In August 2013, the project was doubled in scope and redirected towards providing MHz-rate X-ray pulses from 0.2 to 5.0 keV while still supporting the ongoing program at the LCLS. The accelerator is now based on a 4.0 GeV SCRF linac installed in the front of the SLAC linac tunnel. Status and challenges of LCLS-II in context of July 2013 recommendation of DOE BESAC for a fully coherent, cw, FEL with photon energies up to ~5 keV.  
slides icon Slides TUIOA04 [6.386 MB]  
 
TUIOC01 Large Scale Testing of SRF Cavities and Modules cavity, software, laser, vacuum 426
 
  • J. Świerbleski
    IFJ-PAN, Kraków, Poland
  
  Series production of SRF cavities, s.c. quadrupole packages and accelerator modules for the European XFEL is in full swing. Mid 2014 approx. 400 cavities will be tested, the testing of quadrupoles will be almost finished, and regular module testing will be established. Thus the talk should emphasize the quasi industrial testing of these components, of course including a good overview about the used somewhat unique AMTF infrastructure.  
slides icon Slides TUIOC01 [3.094 MB]  
 
TUPP001 Cryogenic Performance of a New 72 MHz Quarter-Wave Resonator Cryomodule cavity, cryogenics, solenoid, linac 437
 
  • Z.A. Conway, G.L. Cherry, R.L. Fischer, S.M. Gerbick, M. Kedzie, M.P. Kelly, S.H. Kim, S.W.T. MacDonald, R.C. Murphy, P.N. Ostroumov, C.E. Peters, M.A. Power, T. Reid, J.R. Specht
    ANL, Argonne, Illinois, USA
  
  Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract number DE-AC02-06CH11357.
The Argonne National Laboratory ATLAS accelerator’s Intensity and Efficiency Upgrade project has been successfully finished [1]. This upgrade substantially increases beam currents for experimenters working with the existing stable and in-flight rare isotope beams and for the neutron rich beams from the Californium Rare Isotope Breeder upgrade. A major portion of this project involved the replacement of three existing cryomodules, containing 18 superconducting (SC) accelerator cavities and 9 superconducting solenoids, with a single cryomodule containing 7 SC 72.75 MHz accelerator cavities optimized for ion velocities of 7.7% the speed of light and 4 SC solenoids all operating at 4.5 K. This paper reports the measured thermal load to the 4 K and 80 K coolant streams and compares these results to the pre-upgrade cryogenic system. 		 
 
TUPP002 Commissioning of the 72 MHz Quarter-Wave Cavity Cryomodule at ATLAS cavity, SRF, ion, operation 440
 
  • M.P. Kelly, Z.A. Conway, S.M. Gerbick, M. Hendricks, M. Kedzie, S.H. Kim, S.W.T. MacDonald, R.C. Murphy, P.N. Ostroumov, T. Reid, S.I. Sharamentov, G.P. Zinkann
    ANL, Argonne, Illinois, USA
  
  Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract number DE-AC02-06CH11357.
A cryomodule of seven 72 MHz SC quarter-wave cavities optimized for ions with v/c=0.077 has been commissioned in the ATLAS heavy-ion accelerator at Argonne. ATLAS has a new capability for increased beam currents with low beam losses for nuclear physics experiments using stable or rare isotope beams or neutron rich beams from the Californium Rare Isotope Breeder. The main goal for the cryomodule, to provide an accelerating voltage of 17.5 MV (2.5 MV/cavity), with no detectable beam losses has been met within the first month of commissioning. Thus far, cavities and primary subsystems including high-power couplers and pneumatic tuners are operating as designed with full availability. For present levels there is practically no field emission (EPEAK=40 MV/m) and RF losses of ~5 Watts/cavity are only half of that planned. Cavity fields will continue to be gradually increased, with the limits due to cavity quench measured at VACC=3.75 MV. Due to a combination of rf design and cavity processing, effective voltages are now 2 ½ times those for any other operational cavities for this v/c. We report here on the recent online test results and technical features of the present design. 		 
 
TUPP003 4 K Alignment of Superconducting Quarter-Wave Cavities and 9 T Solenoids in the ATLAS Intensity Upgrade Cryomodule target, solenoid, alignment, cavity 443
 
  • S.H. Kim, Z.A. Conway, W.G. Jansma, M. Kedzie, M.P. Kelly, P.N. Ostroumov
    ANL, Argonne, Illinois, USA
  
  Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract number DE-AC02-06CH11357.
The superconducting cavities and, especially, the magnets in high intensity ion linacs need to be aligned to the beam with typical transverse tolerances of 0.25 mm and 0.1 degrees at temperatures of 1.8 – 4.5 K. This is necessary to limit the emittance growth and minimize the beam losses. A new cryomodule with 7 superconducting quarter-wave resonators and 4 superconducting solenoids has been installed and is now operated at the Argonne Tandem Linear Accelerator System (ATLAS). We developed the techniques necessary to assemble the superconducting components in this cryomodule at room temperature so that they are aligned to the beam axis at 4.5 K. We achieved transverse alignment tolerances of <0.2 mm RMS. In this paper, we will present the details of the alignment hardware, procedures and results. 		 
slides icon Slides TUPP003 [0.834 MB]  
 
TUPP005 Completion of Efficiency and Intensity Upgrade of the ATLAS Facility rfq, cavity, solenoid, ion 449
 
  • P.N. Ostroumov, Z.A. Conway, C. Dickerson, S.M. Gerbick, M. Kedzie, M.P. Kelly, S.H. Kim, Y. Luo, S.W.T. MacDonald, R.C. Murphy, B. Mustapha, R.C. Pardo, T. Reid, S.I. Sharamentov, K.W. Shepard, J.R. Specht, G.P. Zinkann
    ANL, Argonne, USA
  • A. Perry
    Illinois Institute of Technology, Chicago, Illlinois, USA
  
  Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357.
The ANL Physics Division has completed a major upgrade of the ATLAS National User Facility by successfully installing a new RFQ and cryomodule. The new normal conducting CW RFQ capable of providing 295 keV/u beams of any ion with m/q ≤7 from protons to uranium was fully integrated into ATLAS and has been in routine operation for more than a year. The RFQ doubled the efficiency of beam delivery to targets and opened the possibility to accelerate much higher intensity beams. Recently, the new cryomodule containing 7 high-performance 72.75 MHz superconducting quarter-wave resonators and 4 superconducting solenoids was successfully commissioned with beam. New design and fabrication techniques for these resonators resulted in record high voltages which were achieved during the beam commissioning. The new cryomodule provides 17.5 MV accelerating voltage which will be gradually raised by increasing the input RF power and improving LLRF system. The new cryomodule, which replaced 3 old cryomodules that used split-ring cavities, is also essential for high intensity stable beams. Results of beam commissioning and operation of ATLAS with the new RFQ and cryomodule will be presented. 		 
 
TUPP019 Qualification of the Titanium Welds in the E-XFEL Cryomodule and the CE Certification cavity, operation, linac, quadrupole 468
 
  • S. Barbanotti, H. Hintz, K. Jensch, R. Klos, W. Maschmann, A. Matheisen, A. Schmidt
    DESY, Hamburg, Germany
  • C. Boulch, C. Cloué, C. Madec, J.L. Perrin, T. Trublet
    CEA/IRFU, Gif-sur-Yvette, France
  • J.-P. Charrier, O. Napoly
    CEA/DSM/IRFU, France
  
  The CE stamping of the one hundred 1.3 GHz cryomodules for the XFEL Linac is a main step in the process of the certification of the entire Linac as a pressure equipment. Stringent requirements on materials and the quality of the welds of the pressurised components need to be satisfied to obtain the stamp. This paper summarizes these requirements, describes the process developed to qualify each module and summarises the rework campaign on the cavity helium vessels made necessary to obtain the required quality for a reliable and safe accelerator.  
 
TUPP021 A New Type of Waveguide Distribution for the Accelerator Module Test Facility of the European XFEL klystron, cavity, shielding, operation 475
 
  • V.V. Katalev, S. Choroba
    DESY, Hamburg, Germany
  • E.M. Apostolov
    MicroPlus-Apostolov Ltd., Sofia, Bulgaria
  • A.A. Seliverstov
    s.p.a. FERRITE Ltd., St.Petersburg, Russia
  
  In order to test 100 superconducting accelerator modules within two years three test benches have been created in the accelerator module test facility (AMTF) to achieve the rate of one cryomodule per week. Each RF station of the test facility consists of a 5 MW klystron, at 1.3 GHz, 1.37 ms pulse width and 10 Hz repetition rate, and a waveguide distribution system. Each waveguide distribution supplies RF power to eight cavities, four times a pair of cavities. The distribution allows for a maximum power of 1 MW per cavity when the distribution is switched to mode supplying power to only four cavities. A new type of 1 MW isolator and a new compact 5 MW power divider have been developed to achieve that goal. Several cryomodule have been already successfully tested with this setup. We present the waveguide distribution for this test stand and describe the performance of the different elements.  
 
TUPP040 Preliminary Functional Analysis of ESS Superconducting Radio-Frequency Linac vacuum, controls, interface, SRF 522
 
  • C. Darve, N. Elias, J. Fydrych, D.P. Piso
    ESS, Lund, Sweden
  
  The European Spallation Source (ESS) is one of Europe's largest planned research infrastructures. The collaborative project is funded by a collaboration of 17 European countries and is under design and construction in Lund, Sweden. Three families of Superconducting Radio-Frequency (SRF) cavities are being prototyped, counting the spoke resonators with a geometric beta of 0.5, medium-beta elliptical cavities (βg=0.67) and high-beta elliptical cavities (bg=0.86). The 5 MW, 2.86 ms long pulse proton accelerator has a repetition frequency of 14 Hz (4 % duty cycle), and a beam current of 62.5 mA. The cavities and power couplers are assembled into cryomodules, which are operating using RF sources, cryogenic and water coolings. This document describes the process of the ESS SRF cryomodule operation while refereeing to operational modes.  
 
TUPP052 SSR1 Tuner Mechanism: Passive and Active Device cavity, alignment, SRF, operation 541
 
  • D. Passarelli
    Fermilab, Batavia, Illinois, USA
  
  In this paper we present the methodology adopted in designing the mechanism responsible for controlling the resonant frequency of Single Spoke Resonators of first type (SSR1). Such device is capable of compensating the effects of external perturbations, such as pressure fluctuations and microphonics, on the frequency of SSR1. The compensation is achieved through active responses via an actuation system and passive responses which are inherent to the elastic behavior of the overall system. The first experiences in the design, assembly, QA and testing are reported.  
poster icon Poster TUPP052 [2.368 MB]  
 
TUPP054 Study of Beam-Based Alignment for the LCLS-II SC Linac linac, emittance, alignment, quadrupole 544
 
  • A. Saini, N. Solyak, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
  • T.O. Raubenheimer
    SLAC, Menlo Park, California, USA
  
  The Linac Coherent Light Source (LCLS) is an x-ray free electron laser facility. The proposed upgrade of the LCLS facility is based on construction of 4 GeV superconducting (SC) linac. The achievable performance of linac is determined by beam sensitivity to various component errors. In this paper we review misalignment tolerances of LCLS-II SC linac and discuss possible beam-based alignment algorithm to meet these tolerances.  
 
TUPP068 New SRF Facility at KEK for Mass-Production Study in Collaboration with Industries SRF, cavity, operation, cryogenics 584
 
  • H. Hayano
    KEK, Ibaraki, Japan
  
  The construction of the new SRF facility next to the KEK-STF facility has started from 2014 for the mass-production study of SRF accelerators in collaboration with industries. The new building for this facility has the dimension of 80 m x 30 m, and the plan is to install clean-room for cavity-string assembly, cryomodule-assembly facility, cryogenic system, vertical test facility, cryomodule test facility, input coupler process facility, cavity Electro-Polishing (EP) facility, and control-room/office-rooms in it. The purpose of this new SRF facility is to establish a close collaboration between SRF researchers and industries in order to prepare for the upcoming large-scale future SRF project, like ILC. This paper describes the infra-structure detail and the plan to utilize for future SRF accelerators.  
 
TUPP080 Commissioning of the MAX 700 MHz Test Stand cavity, controls, operation, experiment 610
 
  • J.-L. Biarrotte, F. Chatelet, M. El Yakoubi, N. Gandolfo, C. Joly, J. Lesrel, H. Saugnac
    IPN, Orsay, France
  • A. Bosotti, R. Paparella, P. Pierini
    INFN/LASA, Segrate (MI), Italy
  • F. Bouly
    LPSC, Grenoble Cedex, France
  • I. Martin-Hoyo
    ADEX, Madrid, Spain
  
  The MYRRHA project aims at the construction of an Accelerator Driven System demonstrator. The criticality will be sustained by an external spallation neutron flux produced thanks to a 600 MeV high intensity proton beam. This beam will be delivered by a superconducting linac which must fulfil very stringent reliability requirements. Under the MAX (MYRRHA Accelerator eXperiment) program, which aims at pursuing the R&D activities on the ADS-type accelerator, a 700 MHz Cryomodule was developed. The main goal of this test stand is to dispose of a facility to carry out “real scale” reliability oriented studies on a RF Superconducting cavity of the high-energy linac section. This module holds 5-cells elliptical cavity equipped with its blade cold tuning system and its coaxial power coupler. The experimental work undertaken at IPN Orsay, has allowed to fully qualify the module in machine configuration (high RF power, at 2K), including assessment of the tuning system and measurement of microphonics spectrums. During this study the dynamic behavior of the fast tuning system of the cavity was also measured. We review here the obtained results and lessons learnt by operating this module.  
 
TUPP082 The MYRRHA Spoke Cryomodule Design cavity, linac, framework, cryogenics 613
 
  • H. Saugnac, J.-L. Biarrotte, S. Blivet, P. Duchesne, N. Gandolfo, J. Lesrel, G. Olry, E. Rampnoux, D. Reynet
    IPN, Orsay, France
  
  In the framework of the MAX project, dedicated to the detailed study of the MYRRHA facility LINAC, the engineering study of the ‘Spoke’ cavities cryomodule, situated in the low energy superconducting section, has been achieved. The beam optics, highly constrained by strong reliability requirements, leads to a modular cryomodule composed of two β=0.37, 352 MHz, single bar ‘Spoke’ cavity cooled at 2K. The power coupler design, not studied in detail under the MAX project, is directly taken from a 20 kW continuous wave 352 MHz coupler designed and successfully tested in the framework of the previous EUROTRANS and EURISOL projects. The cold tuning system is identical to the one designed for the ESS ‘Spoke’ cavities. We present in this paper, the RF, the mechanical and the thermal design of the complete cryomodule as well as the optimization and simulations of its individual components (Cavity, Cryostat, Tuning System…).  
 
TUPP085 RAON Cryomodule Design for QWR, HWR, SSR1 and SSR2 simulation, linac, vacuum, cavity 622
 
  • W.K. Kim, H. Kim, H.J. Kim, Y. Kim, M. Lee, G.-T. Park
    IBS, Daejeon, Republic of Korea
  
  The accelerator called RAON which will be built in Korea has four kinds of superconducting cavities such as QWR, HWR, SSR1 and SSR2, operating at 2 K and 4.5 K [1]. The current status of design for the QWR, HWR, SSR1 and SSR2 cryomodules are reported. The issues included in the paper are thermal and structural design results of the components such as supports and thermal shield in the cryomodules. The cryomodule hosts the superconducting cavities in high vacuum and thermally insulated environment in order to maintain the operating temperature of superconducting cavities. It also keeps the cavities in a good alignment to the beam line. It has an interface for supplying RF power to cavities between cold and warm components. The whole configuration of the integrated system is also presented. This paper presents the detailed design of the cryomodule.  
 
THIOA02 Superconducting RF Development for FRIB at MSU cavity, solenoid, operation, SRF 790
 
  • K. Saito, N.K. Bultman, E.E. Burkhardt, F. Casagrande, S.K. Chandrasekaran, S. Chouhan, C. Compton, J.L. Crisp, K. Elliott, A. Facco, A.D. Fox, P.E. Gibson, M.J. Johnson, G. Kiupel, R.E. Laxdal, M. Leitner, S.M. Lidia, I.M. Malloch, D. Miller, S.J. Miller, D. Morris, D. Norton, R. Oweiss, J.P. Ozelis, J. Popielarski, L. Popielarski, A.P. Rauch, R.J. Rose, T. Russo, S. Shanab, M. Shuptar, S. Stark, N.R. Usher, G.J. Velianoff, D.R. Victory, J. Wei, G. Wu, X. Wu, T. Xu, T. Xu, Y. Yamazaki, Q. Zhao, Z. Zheng
    FRIB, East Lansing, Michigan, USA
  
  Funding: *This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661.
FRIB is a $730M heavy ion accelerator project and a very large scale machine for many nuclear physics users. The civil construction started on March 17th 2014. The SRF system design and development have completed. The machine is to be in early completion end of 2019. FRIB accelerates ion species up to 238U with energies of no less than 200MeV/u and provides a beam power up to 400kW. Four SRF cavity families are used from β=0.041, 0.085 (QWRs) to 0.29 and 0.53 (HWRs). 8T superconducting solenoids are installed in the cryomodules for space effective strong beam focusing. The biggest challenges are in accelerating the high-power heavy ion beams from the very low energy to medium energy and the stable operation for large user community. The SRF cryomodule design addressed three critical issues: high performance, stable operation and easy maintainability, which chose several unique technical strategies, e.g.2K operation, bottom up cryomodule assembly, local magnetic shielding and so on. This talk will include high performance cavity R&D, local magnetic shielding, flux trapping by solenoid fringe field, and bottom up cryomodule assembly. 		 
slides icon Slides THIOA02 [5.049 MB]  
 
THIOA03 Status of the HIE-ISOLDE Linac linac, cavity, solenoid, vacuum 795
 
  • W. Venturini Delsolaro, L. Alberty, L. Arnaudon, K. Artoos, J. Bauche, A.P. Bernardes, J.A. Bousquet, E. Bravin, S. Calatroni, E.D. Cantero, O. Capatina, N. Delruelle, D. Duarte Ramos, M. Elias, F. Formenti, M.A. Fraser, J. Gayde, S. Giron, N.M. Jecklin, Y. Kadi, G. Kautzmann, Y. Leclercq, P. Maesen, V. Mertens, E. Montesinos, V. Parma, G.J. Rosaz, K.M. Schirm, E. Siesling, D. Smekens, A. Sublet, M. Therasse, D. Valuch, G. Vandoni, E. Vergara Fernandez, D. Voulot, L.R. Williams, P. Zhang
    CERN, Geneva, Switzerland
  
  The HIE-ISOLDE project aims at increasing the energy of the radioactive beams (RIB) of REX-ISOLDE from the present 3 MeV/u up to 10 MeV/u for A/q up to 4.5. This will be accomplished by means of a new superconducting linac, based on independently phased quarter wave resonators using the Nb sputtering on copper technology, and working at 101.28 MHz. The focusing elements are superconducting solenoids providing 13.5 T2m field integral. These active elements are contained in a common vacuum cryostat. The presentation will cover the status of advancement of the HIE-ISOLDE linac technical systems. The performance of the superconducting elements will be presented, together with the assembly work of the cryomodule in clean room and the planned qualification tests in the horizontal test facility at CERN  
slides icon Slides THIOA03 [24.692 MB]  
 
THIOA04 Superconducting Cavities and Cryomodules for Proton and Deuteron Linacs cavity, linac, vacuum, cryogenics 801
 
  • G. Devanz
    CEA/IRFU, Gif-sur-Yvette, France
  
  We review the recent advances in the design plans and test results of the superconducting structures for proton (ESS) and deuteron linacs (SPIRAL2, IFMIF). A variety of RF resonators are used for this purposes, from multicell elliptical cavities for the acceleration of pulsed proton beams to half and quarter wave resonators for CW deuteron beams. The increase in beam power with respect to previous generations of linacs brings new challenges to cavities and RF couplers. Test results of the available SRF prototypes and cryomodules of the aforementioned projects will be presented.  
slides icon Slides THIOA04 [6.785 MB]  
 
THIOA05 An 800 MeV Superconducting Linac to Support Megawatt Proton Operations at Fermilab linac, booster, cavity, operation 807
 
  • V.A. Lebedev, P. Derwent, S.D. Holmes
    Fermilab, Batavia, Illinois, USA
  
  Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy
Active discussion on the high energy physics priorities in the US carried out since summer of 2013 resulted in changes in Fermilab plans for future development of the existing accelerator complex. In particular, the scope of Project X was reduced to the support of the Long Base Neutrino Facility (LBNF) at the project first stage. The name of the facility was changed to the PIP-II (Proton Improvement Plan). This new facility is a logical extension of the existing Proton Improvement Plan aimed at doubling average power of the Fermilab’s Booster and Main Injector (MI). Its design and required R&D are closely related to the Project X. The paper discusses the goals of this new facility and changes to the Project X linac introduced to support the goals. 		 
slides icon Slides THIOA05 [1.597 MB]  
 
THIOB01 Cryogenic Plants for SRF Linacs vacuum, SRF, linac, cryogenics 811
 
  • D. Arenius
    JLab, Newport News, Virginia, USA
  
  Review of the types of considerations that go into cryo-plant design. Arenius is a world expert on this topic and has led the completion of the upgraded cryo-plant at Jefferson Lab, and has recently provided substantial input on this question to the new LCLS II project.  
slides icon Slides THIOB01 [4.382 MB]  
 
THIOB02 SPIRAL2 Cryomodule Production Result and Analysis cavity, operation, linac, cryogenics 814
 
  • P.-E. Bernaudin, R. Ferdinand
    GANIL, Caen, France
  • P. Bosland, C. Marchand
    CEA/IRFU, Gif-sur-Yvette, France
  • Y. Gómez Martínez
    LPSC, Grenoble Cedex, France
  • D. Longuevergne, G. Olry
    IPN, Orsay, France
  
  The production and qualification of the SPIRAL2 cryomodules are close to the end. Their performances are now well established. This paper will explain the path followed to the good achievements, and show some statistical analyses to be used for future projects. How far can we push the performances? What cryogenics consumption shall we take as design values?  
slides icon Slides THIOB02 [2.864 MB]  
 
THIOC01 SPIRAL2 Bunch Extension Monitor detector, cavity, linac, background 824
 
  • R.V. Revenko, J.L. Vignet
    GANIL, Caen, France
  
  Funding: The work is funded in frame of CRISP WP3T1
Superconducting linacs require beam diagnostics to quantify the time extension of the bunch for a proper beam adaptation. Bunch extension monitor (BEM) should provide measurements with required resolution and minimal disturbance of beam properties, have a broad dynamic range of beam intensity and should be easy to use for accelerator routine operation. The design of BEM should take into account operation at the vicinity of cryomodules and satisfy imposed requirements for this. BEM measures the x-rays resulting of the bunch interaction with a tungsten wire. Developed prototype of detector was successfully tested with ions beams. Test for detector background conditions at vicinity of cryomodule was carried out and results are presented. 		 
slides icon Slides THIOC01 [7.054 MB]  
 
THIOC03 Operational Experience With CW High Gradient and High QL Cryomodules cavity, controls, EPICS, klystron 834
 
  • C. Hovater, T.L. Allison, R. Bachimanchi, E. Daly, M.A. Drury, G.E. Lahti, C.I. Mounts, R.M. Nelson, T. E. Plawski
    JLab, Newport News, Virginia, USA
  
  Funding: This manuscript has been authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
The Continuous Electron Beam Accelerator Facility (CEBAF) energy upgrade from 6 GeV to 12 GeV includes the installation of ten new 100 MV cryomodules (80 cavities). The superconducting RF cavities are designed to operate CW at an accelerating gradient of 19.3 MV/m with a QL of 3×107. The RF system employs single cavity control using new digital LLRF controls and 13 kW klystrons. Recently, all of the new cryomodules and associated RF hardware and software have been commissioned and operated in the CEBAF accelerator. Electrons at linac currents up to 10 μA have been successfully accelerated and used for nuclear physics experiments. This paper reports on the commissioning and operation of the cryomodules and RF system. 		 
slides icon Slides THIOC03 [5.793 MB]  
 
THPP017 Beam-Based HOM Studies of the Cornell Energy Recovery Linac 7-Cell SRF Cavity HOM, cavity, linac, experiment 869
 
  • D.L. Hall, A.C. Bartnik, M.G. Billing, R.G. Eichhorn, G.H. Hoffstaetter, M. Liepe, C.E. Mayes, P. Quigley, V. Veshcherevich
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  
  Funding: NSF Grant DMR-0807731
The 1.3 GHz 7-cell SRF cavity for the Cornell ERL main linac is optimized for high beam current ERL operation with injected CW beam currents of 100 mA. Beam stability at 100 mA requires very strong damping of the Higher-Order-Modes (HOM) in the cavity by HOM beamline absorbers at the ends of the cavity. To verify the optimized design of the cavity and the HOM damping scheme, a prototype 7-cell main linac cavity was installed into the Cornell Horizontal Test Cryomodule (HTC), and inserted into the beamline of the Cornell ERL high current photo-injector. A beam-based method was then used to search for the presence of dangerous HOMs. Individual HOMs were excited using a charge-modulated beam, after which their effect upon an unmodulated beam was observed using a BPM. Data collected was used to calculate loaded Q of observed HOMs. Results show that it is very unlikely that HOMs will cause BBU in the Cornell ERL. In addition, measurements of the temperature rise of the HOM absorber rings during high current CW beam tests were consistent with simulations, indicating that the optimized main linac cavity is capable of operating at the specified current of 100mA in an ERL configuration. 		 
 
THPP031 Plans for an ERL Test Facility at CERN cavity, electron, SRF, linac 905
 
  • E. Jensen, O.S. Brüning, R. Calaga, K.M. Schirm, R. Torres-Sanchez, A. Valloni
    CERN, Geneva, Switzerland
  • K. Aulenbacher
    IKP, Mainz, Germany
  • S.A. Bogacz, A. Hutton
    JLab, Newport News, Virginia, USA
  • M. Klein
    The University of Liverpool, Liverpool, United Kingdom
  
  The baseline electron accelerator for LHeC and one option for FCC-he is an Energy Recovery Linac. To prepare and study the necessary key technologies, CERN has started – in collaboration with JLAB and Mainz University – the conceptual design of an ERL Test Facility (ERL-TF). Staged construction will allow the study under different conditions with up to 3 passes, beam energies of up to about 1 GeV and currents of up to 50 mA. The design and development of superconducting cavity modules, including coupler and HOM damper designs, are also of central importance for other existing and future accelerators and their tests are at the heart of the current ERL-TF goals. The ERL-TF could also provide a unique infrastructure for several applications that go beyond developing and testing the ERL technology at CERN. In addition to experimental studies of beam dynamics, operational and reliability issues in an ERL, it could equally serve for quench tests of superconducting magnets, as physics experimental facility on its own right or as test stand for detector developments. This contribution will describe the goals and the concept of the facility and the status of the R&D.  
 
THPP041 The Accelerator Cryoplant at ESS controls, operation, cryogenics, linac 939
 
  • P. Arnold, J. Fydrych, W. Hees, J.M. Jurns, X. Wang, J.G. Weisend
    ESS, Lund, Sweden
  
  The European Spallation Source (ESS) is a neutron science facility funded by a collaboration of 17 European countries currently under design and construction in Lund, Sweden. Cryogenic cooling is vital particularly for the linear accelerator, producing a 5 MW beam of 2.0 GeV protons to strike a rotating tungsten target. The cryogenic section of the linac comprises cryomodules with superconducting RF cavities that require helium cooling at 2.0 K, shield cooling at ~40 K and liquid helium for power coupler cooling. An extensive cryogenic distribution system connects the cryomodules with the linac cryoplant. With estimated electricity consumption of up to 3 MW this plant will be one of the major power consumers at ESS. Turndown modes and the intrinsic uncertainties regarding heat loads drive the need for high plant efficiency not only during full load operation but also at reduced performance. Together with flexibility and reliability over a long operation period these are the key challenges that will be addressed in this paper.  
poster icon Poster THPP041 [4.141 MB]  
 
THPP046 SRF Highbay Technical Infrastructure for FRIB Production at Michigan State University SRF, cavity, vacuum, controls 954
 
  • L. Popielarski, F. Casagrande, C. Compton, T. Elkin, A. Fila, P.E. Gibson, M. Hodek, L. Hodges, I.M. Malloch, C. Nguyen, R. Oweiss, J.P. Ozelis, J. Popielarski, C. Thronson, D.R. Victory, T. Xu
    FRIB, East Lansing, Michigan, USA
  • M. Leitner
    LBNL, Berkeley, California, USA
  
  Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE- SC0000661
Michigan State University (MSU) has funded the construction of a new 27,000 square foot high bay building to house the Superconducting Radio Frequency (SRF) infrastructure for the Facility for Rare Isotope Beams (FRIB) production requirements. The construction has been completed and beneficial occupancy began on May 19th, 2014. The new SRF highbay includes over 4,000 square feet of cleanroom and chemistry facility space, automated cavity etch tools, ultra pure water systems, cold mass component inspection area, hydrogen degassing furnace, SRF testing capabilities for three vertical test Dewars and two horizontal cryomodule test bunkers with dedicated helium refrigeration system. The status of the technical equipment design, installation and commissioning will be presented. 		 
 
THPP054 Study of Coupler's Effect in Third Harmonic Section of LCLS-II SC Linac cavity, linac, emittance, HOM 969
 
  • A. Saini, A. Lunin, N. Solyak, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
  • T.O. Raubenheimer
    SLAC, Menlo Park, California, USA
  
  The Linac Coherent Light Source (LCLS) is an x-ray free electron laser facility. The proposed upgrade of the LCLS facility is based on construction of 4 GeV superconducting (SC) linac which will use two stage bunch compression scheme in order to achieve short bunches with high peak current. In order to reduce non-linear effects in first bunch compressor, third harmonic section is utilized to linearize longitudinal phase space of the beam. However, transverse phase space of beam may get distorted due to coupler RF kicks and coupler wake kicks resulting from the asymmetry of input and HOM couplers in 3.9 GHz cavity. In this paper, we discuss coupler's effects and estimate resulting emittance dilution in third harmonic section. Local compensation of coupler kicks using different orientation of cavities are also addressed.  
 
THPP057 Results of Cold Tests of the Fermilab SSR1 Cavities cavity, radiation, SRF, resonance 979
 
  • A.I. Sukhanov, M.H. Awida, P. Berrutti, E. Cullerton, B.M. Hanna, A. Hocker, T.N. Khabiboulline, O.S. Melnychuk, D. Passarelli, R.V. Pilipenko, Y.M. Pischalnikov, L. Ristori, A.M. Rowe, W. Schappert, D.A. Sergatskov
    Fermilab, Batavia, Illinois, USA
  
  Fermilab is currently building the Project X Injector experiment (PXIE). The PXIE linac will accelerate a 1 mA H− beam up to 30 MeV and serve as a testbed for validation of Project X concepts and mitigation of technical risks. A cryomodule of eight superconducting RF Single Spoke Resonators of type 1 (SSR1) cavities operating at 325 MHz is an integral part of PXIE. Ten SSR1 cavities were manufactured in industry and delivered to Fermilab. We discuss tests of nine bare SSR1 cavities at the Fermilab Vertical Test Stand (VTS). Recently, one of the SSR1 cavities was welded inside a helium jacket. Results of the test of this cavity in the Fermilab Spoke Test Cryostat (STC) are shown. We report on the measured performance parameters of SSR1 cavities achieved during the tests.  
 
THPP060 Effect of Cavity Couplers Field on the Beam Dynamics of the LCLS-II Injector simulation, HOM, cavity, emittance 989
 
  • A. Vivoli, A. Lunin, A. Saini, N. Solyak
    Fermilab, Batavia, Illinois, USA
  • A.C. Bartnik, I.V. Bazarov, B.M. Dunham, C.M. Gulliford, C.E. Mayes
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  • D. Dowell, Z. Li, T.O. Raubenheimer, J.F. Schmerge, T. Vecchione, F. Zhou
    SLAC, Menlo Park, California, USA
  • D. Filippetto, R. Huang, C. F. Papadopoulos, H.J. Qian, S.P. Virostek, R.P. Wells
    LBNL, Berkeley, California, USA
  
  LCLS-II is a new light source based on a continuous wave (cw) superconducting linac to be built at SLAC. The Injector section of the linac creates the elecron beam and accelerates it up to about 100 MeV. The couplers of the accelerating cavities produce an asymmetric field resulting in a beam offset and, most importantly, in a significant transverse emittance dilution, if not compensated. In this paper we describe the simulations of the LCLS-II injector taking into account the cavity couplers effect and some mitigation techniques to reduce its impact on the beam quality.  
 
THPP072 BERLinPro Booster Cavity Design, Fabrication and Test Plans cavity, booster, SRF, linac 1019
 
  • A. Burrill, W. Anders, A. Frahm, J. Knobloch, A. Neumann
    HZB, Berlin, Germany
  • G. Ciovati, P. Kneisel, L. Turlington
    JLab, Newport News, Virginia, USA
  
  The BERLinPro project, a 100 mA, 50 MeV superconducting RF (SRF) Energy Recovery Linac (ERL) is under construction at Helmholtz-Zentrum Berlin for the purpose of studying the technical challenges and physics of operating a high current, c.w., 1.3 GHz ERL. This machine will utilize three unique SRF cryomodules for the injector, booster and linac module respectively. The booster cryomodule will contain three 2-cell SRF cavities, based on the original design by Cornell University, and will be equipped with twin 115 kW RF power couplers in order to provide the appropriate acceleration to the high current electron beam. This paper will review the status of the fabrication of the 4 booster cavities that have been built for this project by Jefferson Laboratory and look at the challenges presented by the incorporation of fundamental power couplers capable of delivering 115 kW. The test plan for the cavities and couplers will be given along with a brief overview of the cryomodule design.  
 
THPP078 Troubleshooting and Performances of Type-B Spiral2 Series Cryomodule cavity, coupling, pick-up, resonance 1037
 
  • D. Longuevergne, F. Chatelet, C. Commeaux, N. Gandolfo, D. Grolet, C. Joly, J. Lesrel, R. Martret, G. Michel, G. Olry, L. Renard, A. Stephen, P. Szott
    IPN, Orsay, France
  
  SPIRAL2 aims at building a multi-purpose facility dedicated to nuclear physics studies, including the production of rich-neutrons isotopes. The multi-beam linear accelerator is composed of superconducting accelerating modules operating at 4.2K and warm focusing magnets. IPN Orsay is in charge of the high energy (Type-B) accelerating modules, each hosting two superconducting 88 MHz quarter-wave resonators made of bulk Niobium operating at an accelerating gradient of 6.5 MV/m (β=0.12). The first Type-B series cryomodule has been validated in April 2013. Since then, four additional cryomodules have been validated in a row showing a very high-quality and reliable assembly procedure. Some of encountered problems (tuner hysteresis, magnetic shielding,…) and associated solutions will be presented. Moreover, a comparison of cavity performances between vertical cryostat and cryomodule tests will be done.  
 
THPP099 Status of Superconducting Cavity and Cryomodule Development at MHI cavity, vacuum, niobium, superconducting-cavity 1084
 
  • T. Yanagisawa, H. Hara, N. Ikeda, K. Sennyu
    MHI, Hiroshima, Japan
  
  MHI's activities for ｓuperconducting accelerator are reported. MHI had developed several procedure and method of ILC cavity production for stable quality and cost reduction. And we had fabricated and installed cryomodules for ILC and ERL R&D. These activities are reported in detail.  
 
THPP109 History of Cryomodule Repairs at SNS HOM, cavity, operation, linac 1108
 
  • M.P. Howell, M. Doleans, D.L. Douglas, S.-H. Kim
    ORNL, Oak Ridge, Tennessee, USA
  • R. Afanador, B. DeGraff, B.S. Hannah, C.J. McMahan, T.S. Neustadt, S.W. Ottaway, J. Saunders, P.V. Tyagi, D.M. Vandygriff
    ORNL RAD, Oak Ridge, Tennessee, USA
  
  The operation of the Superconducting linear accelerator (SCL) has matured and now averages less than one trip per day. The availability of the SCL including radiofrequency systems, high voltage converter modulators, controls, vacuum and other support systems over the last three years is approximately 98%. The SNS has been in operation for ten years including the commissioning period. In support of achieving the stability of operation, multiple cryomodule repairs have been performed. Repairs to cryomodules have included instruments, helium leaks, valve actuators, cavity tuners, insulating vacuum repairs and upgrades, power supplies, higher order mode (HOM) feedthroughs, coupler windows, and coupler cooling components. Performance degradation has been experienced in multiple cavities. This has been corrected by thermal cycling the cryomodules with the affected cavities. Only two cavities have displayed slight permanent degradation that could not be corrected by thermal cycling. Repairs made to the SNS cryomodule will be detailed in this paper.  
 
THPP131 Series Superconducting Cavity Production for the HIE-ISOLDE Project at CERN cavity, vacuum, niobium, pick-up 1165
 
  • M. Therasse, L. Alberty, K. Artoos, S. Calatroni, O. Capatina, A. D'Elia, N.M. Jecklin, Y. Kadi, I. Mondino, K.M. Schirm, A. Sublet, W. Venturini Delsolaro, P. Zhang
    CERN, Geneva, Switzerland
  
  In the context of the HIE-ISOLDE linac upgrade at CERN, the phase 1 planned to boost the energy of the machine from 3 MeV/u to 5 MeV/u. For this purpose, it is planned to install 2 cryomodules based on quarter waves resonators (QWRs) made by Niobium sputtering on Copper. The poster will present the different steps of the cavity series production since the reception from the industry to the cavity storage before cryomodule assembly. We will describe the cavity preparation included the resonance frequency measurement, the chemical treatment, the cavity rinsing, the Niobium coating and the RF test at 4.5K.  
 
THPP135 Recent Improvements to Software Used for Optimization of SRF Linacs cavity, linac, cryogenics, SRF 1174
 
  • T. Powers
    JLab, Newport News, Virginia, USA
  
  Funding: Notice: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
This work describes a software tool that allows one to vary parameters and understand the effects on the optimized costs of construction plus 10 year operations of an SRF linac. The program includes estimates for the associated cryogenic facility, and controls hardware, where operation costs includes the cost of the electrical utilities but not the labor or other costs. The software interface provides the ability to vary the cost of the different aspects of the machine as well as to change the cryomodule and cavity types. Additionally, this work will describe the recent improvements to the software that allow one to estimate the costs of energy recovery based linacs and to enter arbitrary values of the low field Qo and Qo slope. The initial goal was to convert a spreadsheet format to a graphical interface to allow the ability to sweep different parameter sets. The tools also allow one to compare the cost of the different facets of the machine design and operations so as to better understand the tradeoffs. An example of how it was used to investigate the cost optimization tradeoffs for the LCLS 2 linac will also be presented.