Keyword: experiment
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MOP2WA03 Experiments and Theory on Beam Stabilization with Second-Order Chromaticity impedance, damping, betatron, simulation 32
 
  • M. Schenk, X. Buffat, L.R. Carver, K.S.B. Li, E. Métral
    CERN, Geneva, Switzerland
  • A. Maillard
    ENS, Paris, France
 
  This study reports on an alternative method to generate transverse Landau damping to suppress coherent instabilities in circular accelerators. The incoherent betatron tune spread can be produced through detuning with longitudinal rather than transverse action. This approach is motivated by the high-brightness, low transverse emittance beams in future colliders where detuning with transverse amplitude will be less effective. Detuning with longitudinal action can be introduced with a radio frequency (rf) quadrupole, or similarly, using second-order chromaticity. The latter was enhanced in the Large Hadron Collider (LHC) at CERN and experimental results on single-bunch stabilization are briefly recapped. The observations are interpreted analytically by extending the Vlasov formalism to include nonlinear chromaticity. Finally, the newly developed theory is benchmarked against circulant matrix and particle tracking models.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-MOP2WA03  
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TUP1WE03 Beam Instruments for High Power Spallation Neutron Source and Facility for ADS target, proton, radiation, neutron 99
 
  • S.I. Meigo
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
 
  As increase of beam power, beam instruments play an essential role in the Hadron accelerator facility. In J-PARC, the pitting erosion on the mercury target vessel for the spallation neutron source is one of a pivotal issue to operate with the high power of the beam operation. Since the erosion is proportional to the 4th power of the beam current density, the minimization of the peak current density is required. To achieve low current density, the beam-flattening system by nonlinear beam optics using octupole magnets in J-PARC. By the present system, the peak density was successfully reduced by 30% compared to the ordinary linear optics. Also in J-PARC, transmutation experimental facility is planned for the realization of the accelerator-driven system (ADS), which will employ powerful accelerator with the beam power of 30 MW. To achieve equivalent damage on the target as the ADS, the target will be received high current density. For the continuous observation of the beam status on the target, a robust beam profile monitor is required. We have been developed beam profile monitor by using heavy-ion of Ar beam to give the damage efficiently.  
slides icon Slides TUP1WE03 [15.133 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUP1WE03  
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TUP2WE03 Radiation Damage Calculation in PHITS and Benchmarking Experiment for Cryogenic-Sample High-Energy Proton Irradiation proton, radiation, target, scattering 116
 
  • Y. Iwamoto, D. Satoh
    JAEA, Ibaraki-ken, Japan
  • Y. Ishi, Y. Kuriyama, T. Uesugi, H. Yashima, T. Yoshiie
    Kyoto University, Research Reactor Institute, Osaka, Japan
  • H. Matsuda, S.I. Meigo
    JAEA/J-PARC, Tokai-mura, Japan
  • T. Nakamoto
    KEK, Ibaraki, Japan
  • K. Niita
    Research Organization for Information Science & Technology, Ibaraki, Japan
  • R.M. Ronningen
    FRIB, East Lansing, Michigan, USA
  • T. Shima
    RCNP, Osaka, Japan
 
  Funding: The experimental study was supported by JSPS KAKENHI, Grant Number JP 16H04638 and 25820450. The calculation work was supported in part by the US National Science Foundation under grant PHY06-06007.
The radiation damage model in the Particle and Heavy Ion Transport code System (PHITS) has been developed using the screened Coulomb scattering to evaluate the energy of the target Primary Knock on Atom (PKA) created by the projectile and the secondary particles which include all particles created from the sequential nuclear reactions. For the high-energy proton incident reactions, a target PKA created by the secondary particles was more dominant than a target PKA created by the projectile. To validate prediction of DPA values in metals irradiated by >100 MeV protons, we developed a proton irradiation device with a Gifford-McMahon (GM) cryocooler to cryogenically cool wire samples. By using this device, the defect-induced electrical resistivity changes related to the DPA cross section of copper and aluminum were measured under irradiation with 125 and 200 MeV protons at cryogenic temperature. A comparison of the experimental DPA cross sections with the calculated results indicates that the athermal-recombination-corrected displacement damage (arc-dpa) provide better quantitative descriptions of the DPA cross section than NRT-dpa without defect production efficiencies.
 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUP2WE03  
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TUA2WD01 FAIR Commissioning - Concepts and Strategies in View of High-Intensity Operation operation, MMI, controls, 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]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUA2WD01  
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TUP2WA01 Optical Stochastic Cooling Experiment at the Fermilab IOTA Ring undulator, optics, electron, radiation 168
 
  • J.D. Jarvis, V.A. Lebedev, H. Piekarz, P. Piot, A.L. Romanov, J. Ruan
    Fermilab, Batavia, Illinois, USA
  • M.B. Andorf, P. Piot
    Northern Illinois University, DeKalb, Illinois, USA
 
  Funding: Fermi National Accelerator Laboratory is operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.
Beam cooling enables an increase of peak and average luminosities and significantly expands the discovery potential of colliders; therefore it is an indispensable component of any modern design. Optical Stochastic Cooling (OSC) is a high-bandwidth, beam-cooling technique that will advance the present state-of-the-art, stochastic cooling rate by more than three orders of magnitude. It is an enabling technology for next-generation, discovery-science machines at the energy and intensity frontiers including hadron and electron-ion colliders. This paper presents the status of our experimental effort to demonstrate OSC at the Integrable Optics Test Accelerator (IOTA) ring, a testbed for advanced beam-physics concepts and technologies that is currently being commissioned at Fermilab. Our recent efforts are centered on the development of an integrated design that is prepared for final engineering and fabrication. The paper also presents a comparison of theoretical calculations and numerical simulations of the pickup-undulator radiation and its interaction with electrons in the kicker-undulator.
 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUP2WA01  
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WEP1WB04 Design of Linac-100 and Linac-30 for New Rare Isotope Facility Project DERICA at JINR linac, cavity, rfq, electron 220
 
  • S.M. Polozov, V.S. Dyubkov, T. Kulevoy, Y. Lozeev, T.A. Lozeeva, A.V. Samoshin
    MEPhI, Moscow, Russia
  • A.S. Fomichev, L.V. Grigorenko
    JINR/FLNR, Moscow region, Russia
  • T. Kulevoy
    ITEP, Moscow, Russia
 
  DERICA (Dubna Electron-Radioactive Ion Collider fAcility) is the new ambitious project under development at JINR, Dubna *. DERICA is proposed as the next step in RIB facilities development. It is planned that in the DERICA project the RIBs produced by the Fragment Separator, are stopped in a gas cell, are accumulated in the ion trap and then are transferred to the ion trap/charge breeder, creating the highest possible charge state for the further effective acceleration (system {gas cell - ion trap - ion trap/charge breeder}). From the accelerator point of view DERICA will include the driver LINAC-100 of heavy ions with Z=5-92 (energy up to 100 MeV/u) with operating mode close to CW, the fragment separator, the re-accelerator LINAC-30 of secondary beams with energies in the range 5-30 MeV/u), the fast ramping ring (energy <300 AMeV), the collector ring and the electron storage ring. General DERICA concept and possible design of the LINAC-100 and LINAC-30 accelerators playing a key role in the project will presented in this report.
* A.S. Fomichev et al., Scientific program of DERICA prospective accelerator and storage ring facility for radioactive ion beam research, http://aculina.jinr.ru/pdf/DERICA/DERICA-for-ufn-8-en.pdf
 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEP1WB04  
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WEA1WA01 Sum Resonances with Space Charge resonance, space-charge, coherent-effects, simulation 226
 
  • G. Franchetti
    GSI, Darmstadt, Germany
 
  This presentation will discuss the extension of the theory of the sum resonances with space charge.  
slides icon Slides WEA1WA01 [5.267 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEA1WA01  
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WEP2PO002 Scaling Laws for the Time Dependence of Luminosity in Hadron Circular Accelerators based on Simple Models of Dynamic Aperture Evolution luminosity, collider, proton, hadron 260
 
  • F.F. Van der Veken, M. Giovannozzi
    CERN, Geneva, Switzerland
 
  In recent years, models for the time-evolution of the dynamic aperture have been proposed and applied to the analysis of non-linear betatronic motion in circular accelerators. In this paper, these models are used to derive scaling laws for the luminosity evolution and are applied to the analysis of the data collected during the LHC physics runs. An extended set of fills from the LHC proton physics has been analysed and the results presented and discussed in detail. The long-term goal of these studies is to improve the estimate of the performance reach of the HL-LHC.  
poster icon Poster WEP2PO002 [5.757 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEP2PO002  
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WEP2PO028 Conceptual Design of FLNR JINR Radiation Facility Based on DC130 Cyclotron cyclotron, radiation, extraction, vacuum 324
 
  • N.Yu. Kazarinov, P.Yu. Apel, V. Bashevoy, V. Bekhterev, S.L. Bogomolov, O.N. Borisov, J. Franko, G.G. Gulbekyan, I.A. Ivanenko, I.V. Kalagin, V.I. Mironov, S.V. Mitrofanov, V.A. Semin, V.A. Skuratov, A. Tikhomirov
    JINR, Dubna, Moscow Region, Russia
 
  Flerov Laboratory of Nuclear Reaction of Joint Institute for Nuclear Research begins the works under the conceptual design of radiation facility based on the DC130 cyclotron. The facility is intended for SEE testing of microchips, for production of track membranes and for solving of applied physics problems. The DC130 cyclotron will accelerate heavy ions with mass-to-charge ratio A/Z of the range from 5 to 8 up to fixed energies 2 and 4.5 MeV per unit mass. The intensity of the accelerated ions will be about 1 pmcA for lighter ions (A<50) and about 0.1 pmcA for heavier ions (A>50). The injection into cyclotron will be realized from the external DECRIS-SC superconducting ECR ion source. The main magnet and acceleration system of DC130 is based on the U200 cyclotron ones that now is under reconstruction. The conceptual design parameters of various systems of the cyclotron and the set of experimental beam lines are presented in this report.  
poster icon Poster WEP2PO028 [1.955 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEP2PO028  
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