Keyword: operation
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MOA1PL03 Linac4 Commissioning Status and Challenges to Nominal Operation linac, MMI, injection, emittance 14
 
  • G. Bellodi
    CERN, Geneva, Switzerland
 
  Linac4 will be connected to the Proton Synchrotron Booster (PSB) during the next long LHC shutdown in 2019 and it will operationally replace Linac2 as provider of protons to the CERN complex as of 2021. Commissioning to the final beam energy of 160 MeV was achieved by the end of 2016. Linac4 is presently under-going a reliability and beam quality test run to meet the beam specifications and relative tolerances requested by the PSB. In this paper we will detail the main challenges left before achieving nominal operation and we will re-port on the commissioning steps still needed for final validation of machine readiness before start of operation.  
slides icon Slides MOA1PL03 [20.659 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-MOA1PL03  
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MOP1WA01 J-PARC RCS: Effects of Emittance Exchange on Injection Painting emittance, injection, space-charge, betatron 20
 
  • H. Hotchi
    JAEA/J-PARC, Tokai-mura, Japan
 
  The J-PARC RCS is a high-power rapid cycling synchrotron aiming for a 1-MW output beam power. This talk reports the recent progress of the J-PARC RCS beam commissioning and operation especially focusing on our efforts for beam dynamics issues that we faced during the process of the beam power ramp-up.  
slides icon Slides MOP1WA01 [4.081 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-MOP1WA01  
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MOP2WA05 Simulation and Measurement of the TMCI Threshold in the LHC impedance, simulation, coupling, synchrotron 43
 
  • D. Amorim, S. A. Antipov, N. Biancacci, X. Buffat, L.R. Carver, E. Métral
    CERN, Geneva, Switzerland
 
  The transverse mode coupling instability occurs in individual bunches when two transverse oscillation modes couple at high intensity. Simulations predict an instability threshold in the LHC at a single bunch intensity of 3*1011 protons. The TMCI threshold can be inferred by measuring the tune shift as a function of intensity. This measurement was performed in the LHC for different machine impedances and bunch intensities. The impedance was changed by varying the primary and secondary collimators gaps to increase their contribution to the resistive wall impedance. The experiment also allowed to assess the validity of the LHC impedance model in the single bunch case.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-MOP2WA05  
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TUA1WC01 Installation and Commissioning of the Upgraded SARAF 4-rods RFQ rfq, proton, linac, emittance 75
 
  • L. Weissman, D. Berkovits, B. Kaizer, J. Luner, D. Nusbaum, A. Perry, J. Rodnizki, A. Shor, I. Silverman
    Soreq NRC, Yavne, Israel
  • A. Bechtold
    NTG Neue Technologien GmbH & Co KG, Gelnhausen, Germany
 
  Acceleration of a 1mA Continuous Wave (CW) deuteron (A/Q=2) beam at SARAF has been accomplished for the first time. A 5.3 mA pulsed deuteron beam has been accelerated as well. These achievements cap a series of major modifications to the Radio Frequency Quadrupole (RFQ) 4-rods structure which included the incorporation of a new end flange, introduction of an additional RF power coupler and, most recently, installation of a new set of rod electrodes. The new rod modulation has been designed to enable deuteron beam acceleration at a lower inter-electrode voltage, to a slightly reduced final energy of 1.27 MeV/u and with stringent constraints on the extant of beam tails in the longitudinal phase space. This report will focus primarily on the installation and testing of the new rods. The successful conditioning campaign to 200 kW, ~10% above than the working point for deuteron operation, will be described. Beam commissioning with proton and deuteron beams will also be detailed. Results of beam measurements will be presented, including the characterization of the output beam in the transverse and longitudinal phase space. Finally, future possible improvements are discussed.  
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TUP1WE02 Hollow Electron-Lens Assisted Collimation and Plans for the LHC electron, collimation, collider, controls 92
 
  • D. Mirarchi, H. Garcia Morales, A. Mereghetti, S. Redaelli, J.F. Wagner
    CERN, Geneva, Switzerland
  • W. Fischer, X. Gu
    BNL, Upton, Long Island, New York, USA
  • H. Garcia Morales
    Royal Holloway, University of London, Surrey, United Kingdom
  • D. Mirarchi
    The University of Manchester, The Photon Science Institute, Manchester, United Kingdom
  • G. Stancari
    Fermilab, Batavia, Illinois, USA
  • J.F. Wagner
    IAP, Frankfurt am Main, Germany
 
  The hollow electron lens (e-lens) is a very powerful and advanced tool for active control of diffusion speed of halo particles in hadron colliders. Thus, it can be used for a controlled depletion of beam tails and enhanced beam halo collimation. This is of particular interest in view of the upgrade of the Large Hadron Collider (LHC) at CERN, in the framework of the High-Luminosity LHC project (HL-LHC). The estimated stored energy in the tails of the HL-LHC beams is about 30 MJ, posing serious constraints on its control and safe disposal. In particular, orbit jitter can cause significant loss spikes on primary collimators, which can lead to accidental beam bump and magnet quench. Successful tests of e-lens assisted collimation have been carried out at the Tevatron collider at Fermilab and a review of the main outcomes is shown. Preliminary results of recent experiments performed at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven, put in place to explore different operational scenarios studies for the HL-LHC, are also discussed. Status and plans for the deployment of hollow electron lenses at the HL-LHC are presented.  
slides icon Slides TUP1WE02 [29.382 MB]  
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TUP2WE02 The Beam Conditions on the Target and its Operational Impacts on Beam Intercepting Devices at European Spallation Source target, proton, radiation, neutron 110
 
  • Y. Lee, R. Miyamoto, T.J. Shea
    ESS, Lund, Sweden
  • H.D. Thomsen
    ISA, Aarhus, Denmark
 
  A large flux of spallation neutrons will be produced at the European Spallation Source (ESS) by impinging high power proton beam on the tungsten target. Until the 5 MW proton beam is stopped by the spallation target, it travels through a number of beam intercepting devices (BIDs), which include the proton beam window, a multi-wire beam profile monitor, an aperture monitor, the beam entrance window, spallation material and the target shroud. The beam-induced thermo-mechanical loads and the damage dose rate in the BIDs are largely determined by the beam energy and the beam current density. At ESS, the proton beam energy will be commissioned step-wisely, from 570 MeV towards 2 GeV. The beam current density on the BIDs in the target station is equally painted by raster beam optics. The ESS Linac and its beam optics will create rectangular beam profiles on the target with varying beam intensities. In this paper, we study the impacts of different plausible beam intensities and beam energies on the thermo-mechanical loads and radiation damage rates in the BIDs at the ESS target station.  
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TUA2WD01 FAIR Commissioning - Concepts and Strategies in View of High-Intensity Operation MMI, controls, experiment, target 141
 
  • R.J. Steinhagen
    GSI, Darmstadt, Germany
 
  The Facility for Anti-Proton and Ion Research (FAIR) presently under construction, extends and supersedes GSI's existing infrastructure. Its core challenges include the precise control of highest proton and uranium ion beam intensities, the required extreme high vacuum conditions, machine protection and activation issues while providing a high degree of multi-user mode of operation with facility reconfiguration on time-scales of a few times per week. Being based on best-practices at other laboratories, this contribution outlines the applicable hardware and beam commissioning strategies, as well as concepts, beam-based and other accelerator systems that are being tested at the existing facility in view of the prospective FAIR operation.  
slides icon Slides TUA2WD01 [10.735 MB]  
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TUA2WD02 High-Power Beam Operation at J-PARC resonance, simulation, injection, proton 147
 
  • S. Igarashi
    KEK, Ibaraki, Japan
 
  The Japan Proton Accelerator Research Complex (J-PARC) is a multipurpose high-power proton accelerator facility, comprising a 400 MeV linac, a 3 GeV rapid cycling synchrotron (RCS) and a 30 GeV main ring synchrotron (MR). RCS is now providing 500 kW beams to the materials and life science experimental facility (MLF) and its beam power will be increased step by step toward the design value of 1 MW. MR has been operated with the beam power of 500 kW at maximum for the long-baseline neutrino oscillation experiment (T2K). An upgrade plan of MR for the beam power of 1.3 MW for the T2K experiment is promoted with a faster cycling scheme.  
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TUA2WD03 Automated Operation of EBIS Injector at BNL target, heavy-ion, linac, laser 153
 
  • T. Kanesue, E.N. Beebe, S. Binello, B.D. Coe, M.R. Costanzo, L. DeSanto, S. Ikeda, J.P. Jamilkowski, N.A. Kling, D. Lehn, C.J. Liaw, V. Lo Destro, D.R. McCafferty, J. Morris, M. Okamura, R.H. Olsen, D. Raparia, R. Schoepfer, F. Severino, L. Smart, K. Zeno
    BNL, Upton, Long Island, New York, USA
 
  The RHIC-EBIS pre-injector is a heavy ion pre-injector to deliver multiple heavy ion species at 2 MeV/u to the AGS-Booster at the RHIC accelerator complex. In addition to collider experiments at RHIC, multiple heavy ion species are used for the NASA Space Radiation Laboratory (NSRL) to evaluate the risk of radiation in space in radiobiology, physics, and engineering. A GCR simulator is one of the operation modes of NSRL to simulate a galactic cosmic ray event, which requires switching multiple ion species within a short period of time. The RHIC-EBIS pre-injector delivers various heavy ion species independently for simultaneous operation of RHIC and NSRL. We developed an automated scheme of the rapid species change and it is routinely used by NSRL or Main Control Room for daily operation without assistance of RHIC-EBIS experts. The number of species change exceeds one hundred. This paper describes the automated operation of the RHIC-EBIS pre-injector and the operational performance.
This work has been supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy, and by the National Aeronautics and Space Administration.
 
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TUP1WA03 Beam Instabilities After Injection to the LHC injection, simulation, emittance, controls 163
 
  • H. Timko, T. Argyropoulos, I. Karpov, E.N. Shaposhnikova
    CERN, Geneva, Switzerland
 
  Long-lasting phase oscillations have been observed at injection into the LHC since its first start-up with beam. These oscillations, however, were not leading to noticeable losses or blow-up in operation, and were therefore not studied in detail. In 2017, dedicated measurements with high-intensity bunches revealed that oscillations can lead to losses even slightly below the baseline intensity for the high-luminosity upgrade of the LHC. For the first time, high-resolution bunch profile acquisitions were triggered directly at injection and the formation of large-amplitude non-rigid dipole oscillations was observed on a turn-by-turn basis. First simulations can reproduce this instability via bunch filamentation that takes place after injection, depending on the mismatch between the bunch and bucket size in momentum at injection.  
slides icon Slides TUP1WA03 [2.166 MB]  
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WEA1PL01 What is Missing for the Design and Operation of High-Power Linacs? linac, cavity, simulation, lattice 195
 
  • A.P. Shishlo
    ORNL, Oak Ridge, Tennessee, USA
 
  Funding: This manuscript has been authored by UT-Battelle, LLC, under Contract No. DE-AC0500OR22725 with the U.S. Department of Energy.
The design process, tuning, and operation of high-power linacs are discussed. The inconsistencies between the basic beam physics principles used in the design and the operation practices are considered. The missing components of the beam physics tools for the design and operations are examined, especially for negative hydrogen ions linacs. The diagnostics and online models necessary for tuning and characterization of existing states of the linac are discussed.
 
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WEA1WA02 Approaching the High-Intensity Frontier Using the Multi-Turn Extraction at the CERN Proton Synchrotron extraction, emittance, proton, synchrotron 231
 
  • A. Huschauer, H. Bartosik, S. Cettour-Cave, M. R. Coly, D.G. Cotte, H. Damerau, G.P. Di Giovanni, S.S. Gilardoni, M. Giovannozzi, V. Kain, E. Koukovini-Platia, B. Mikulec, G. Sterbini, F. Tecker
    CERN, Geneva, Switzerland
 
  Complementary to the physics research at the LHC, several fixed target facilities receive beams from the LHC injector complex. In the scope of the fixed target physics program at the Super Proton Synchrotron, high-intensity proton beams from the Proton Synchrotron are extracted using the Multi-Turn Extraction scheme, which is based on particle trapping in stable islands of the horizontal phase space. Considering the number of protons requested by future experimental fixed target facilities, such as the Search for Hidden Particles experiment, the currently operationally delivered beam intensities are insufficient. Therefore, experimental studies have been conducted to optimize the Multi-Turn Extraction technique and to exploit the possible intensity reach. The results of these studies along with the operational performance of high-intensity beams during the 2017 run are presented in this paper. Furthermore, the impact of the hardware changes pursued in the framework of the LHC Injectors Upgrade project on the high-intensity beam properties is briefly mentioned.  
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WEP2PO006 Overview of the CERN PSB-to-PS Transfer Line Optics Matching Studies in View of the LHC Injectors Upgrade Project emittance, optics, injection, quadrupole 272
 
  • V. Forte, S.C.P. Albright, W. Bartmann, G.P. Di Giovanni, M.A. Fraser, C. Heßler, A. Huschauer, A. Oeftiger
    CERN, Geneva, Switzerland
 
  At injection into the CERN Proton Synchrotron (PS) a significant horizontal emittance blow-up of the present high brightness beams for the LHC is observed. A partial contribution to this effect is suspected to be an important mismatch between the dispersion function in the transfer line from the PS Booster (PSB) and the ring itself. This mismatch will be unacceptable in view of the beam parameters requested by the LHC Injectors Upgrade (LIU) project with high longitudinal emittance and momentum spread. To deliver the requested beam parameters the PSB-to-PS transfer line will be upgraded and the optics in the line changed to improve the matching from all the four PSB rings. A re-matching campaign from the PSB ring 3 has been carried out to evaluate the impact of the present optics mismatch as a source of emittance growth both in simulations and measurements.  
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WEP2PO010 Fermilab - The Proton Improvement Plan (PIP) booster, proton, linac, cavity 287
 
  • F.G. Garcia, S. Chaurize, C.C. Drennan, K. E. Gollwitzer, V.A. Lebedev, W. Pellico, J. Reid, C.-Y. Tan, R.M. Zwaska
    Fermilab, Batavia, Illinois, USA
 
  The Fermilab Proton Source is composed of three machines: an injector line, a normal conducting Linac and a Booster synchrotron. The proton improvement plan was proposed in 2012 to address the necessary accelerator upgrades and hardware modification to allow an increase in proton throughput, while maintaining acceptable activation levels, ensuring viable operation of the proton source to sustain the laboratory HEP program. A summary of work performed and respective results will be presented.  
poster icon Poster WEP2PO010 [1.699 MB]  
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WEP2PO015 Progress and Plan of the Fast Protection System in the RAON Accelerator controls, MMI, interface, machine-protect 296
 
  • H. Jin, Y. Choi, S. Lee
    IBS, Daejeon, Republic of Korea
 
  In the RAON accelerator, beams generated by ion sources like ECR-IS or ISOL are accelerated to an energy of up to 200 MeV/u before reaching the laboratory target, and the beam power reaches up to about 400 kW at that moment. During transportation of such a beam, if beam loss occurs due to a device malfunction or a sudden change in beam condition, the accelerator can be severely damaged. Therefore, we have developed a machine protection system to protect the devices by minimizing the damage and to operate the accelerator in safe. As part of the RAON machine protection system, a FPGA-based fast protection system (FPS) that can protect devices within a few tens of microseconds after detecting the moment of beam loss has been developed since 2016. The development and test of the FPS prototype was successfully completed last year, and we are now preparing for mass production of the FPS. Here we will present the progress of the FPS development and the future plan for the FPS in the RAON accelerator.  
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WEP2PO030 A 4D Emittance Measurement Device for the 870 keV HIPA Injection Line cyclotron, simulation, proton, space-charge 329
 
  • R. Dölling, M. Rohrer
    PSI, Villigen PSI, Switzerland
 
  A 4D emittance measurement device has recently been installed in PSI's high intensity proton accelerator (HIPA) after the acceleration tube of the Cockcroft-Walton pre-accelerator. A pinhole collimator is moved 2D transversally and at each collimator position, the resulting beamlet is downstream scanned 2D by vertically moving over it a horizontal linear array of small electrodes. The properties of this setup and the intended use are discussed.  
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THA1WD03 Status and Beam Power Ramp-Up Plans of the Slow Extraction Operation at J-Parc Main Ring extraction, septum, proton, quadrupole 347
 
  • M. Tomizawa, Y. Arakaki, T. Kimura, S. Murasugi, R. Muto, K. Okamura, Y. Shirakabe, E. Yanaoka
    KEK, Ibaraki, Japan
 
  A 30 GeV proton beam accelerated in the J-PARC Main Ring (MR) is slowly extracted by the third integer resonant extraction and delivered to the hadron experimental hall. Slow extraction from the MR has unique characteristics that can be used to obtain a low beam loss rate. Devices with electrostatic septum (ESSs) and magnetic septa are placed in the long straight section with zero dispersion. The separatrix for the resonance is independent of the momentum at the septa when the horizontal chromaticity is set to zero. The resulting beam has a large step size and small angular spread, enabling a low hit rate of the beam at the first ESS. Under these conditions, a dynamic bump scheme has been applied to reduce the beam loss further. We have attained 50 kW operation at 5.2s cycle in the latest physics run. A suppression of instability during debunch process is also essential as well as low beam loss tunings. In this paper, a current status and future plans toward a higher beam power for the slow extraction are reported. Preliminary results for a 8 GeV slow extraction test for the muon to electron conversion search experiment (COMET) will be also briefly presented.  
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THA2WD01 Operation Challenges and Performance of the LHC During Run II luminosity, emittance, MMI, brightness 357
 
  • R. Steerenberg, J. Wenninger
    CERN, Geneva, Switzerland
 
  The CERN Large Hadron Collider Run II saw an important increase in beam performance through both, improvements in the LHC and an increased beam brightness from the injectors, leading to a peak luminosity that exceeds the LHC design luminosity by more than a factor two. This contribution will give an overview of run 2, the main challenges encountered and it will address the measures applied to deal with and make use of the increased beam brightness. Finally potential areas where further performance improvement can be a realized will be identified.  
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THA2WD03 Real-Time Measurement of Fluctuations of Building Floor and Installed Devices of Large Scientific Equipment survey, FEL, alignment, real-time 362
 
  • H. J. Choi, J.H. Han, H.-S. Kang, S.H. Kim, H.-G. Lee, S.B. Lee
    PAL, Pohang, Kyungbuk, Republic of Korea
 
  Several parts that comprise the large scientific equipment should be installed and operated at precise three-dimensional location coordinates X, Y, and Z through survey and alignment to ensure their optimal performance. As time goes by, however, the ground goes through uplift and subsidence, which consequently changes the coordinates of installed components and leads to alignment errors ΔX, ΔY, and ΔZ. As a result, the system parameters change, and the performance of the large scientific equipment deteriorates accordingly. Measuring the change in locations of systems comprising the large scientific equipment in real time would make it possible to predict alignment errors, locate any region with greater changes, realign components in the region fast, and shorten the time of survey and realignment. For this purpose, a WPS's (wire position sensor) are installed in undulator section and a HLS's (hydrostatic leveling sensor) are installed in PAL-XFEL building. This paper is designed to introduce installation status of HLS and WPS, operation status.  
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THP2WC03 The Choosing of Magnetic Structure of Isochronous Cyclotron DC-130 for Applied Research cyclotron, acceleration, heavy-ion, extraction 446
 
  • I.A. Ivanenko, J. Franko, G.G. Gulbekyan, I.V. Kalagin, N.Yu. Kazarinov
    JINR, Dubna, Moscow Region, Russia
 
  At the present time, the activities on creation of the new multipurpose isochronous cyclotron DC130 are carried out at the FLNR, JINR. The cyclotron DC130 is intended for microchip testing, production of track pore membranes and for applied physics. The cyclotron will accelerate the heavy ions with mass-to-charge ratio A/Z from 5 to 8 up to the fixed energies 2 and 4.5 MeV per nucleon. The main magnet and acceleration system of DC130 is based on the U200 cyclotron that now is under reconstruction. At the present paper the method of choosing of main magnet parameters of cyclotron is described.  
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