Keyword: experiment
Paper Title Other Keywords Page
MOA12 The Muon Ionization Cooling Experiment ion, emittance, scattering, solenoid 1
 
  • M.A. Uchida
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
 
  The Muon Ionization Cooling Experiment (MICE) is designed to demonstrate a measurable reduction in muon beam emittance due to ionization cooling. This demonstration will be an important step in establishing the feasibility of muon accelerators for particle physics. The emittance of a variety of muon beams is measured before and after a "cooling cell", allowing the change in the phase-space distribution due to the presence of an absorber to be measured. Two solenoid spectrometers are instrumented with high-precision scintillating-fibre tracking detectors (Trackers) before and after the cooling cell which measure the normalized emittance reduction. Data has been taken since the end of 2015 to study several beams of varying momentum and input emittance as well as three absorber materials in the cooling cell, over a range of optics. The experiment and an overview of the analyses are described here.  
slides icon Slides MOA12 [23.988 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-MOA12  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
MOA21 Emittance Evolution in MICE ion, emittance, detector, solenoid 11
 
  • M.A. Uchida
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
 
  Funding: STFC, DOE, NSF, INFN, CHIPP etc
The Muon Ionization Cooling Experiment (MICE) was designed to demonstrate a measurable reduction in beam emittance due to ionization cooling. The emittance of a variety of muon beams was reconstructed before and after a 'cooling cell', allowing the change in the phase-space distribution due to the presence of an absorber to be measured. The core of the MICE experiment is a cooling cell that can contain a range of solid and cryogenic absorbers inside a focussing solenoid magnet. For the data described here, a single lithium hydride (LiH) absorber was installed and two different emittance beam have been analysed. Distributions that demonstrate emittance increase and equilibrium have been reconstructed, in agreement with theoretical predictions. Data taken during 2016 and 2017 is currently being analysed to evaluate the change in emittance with a range of absorber materials, different initial emittance beams and various magnetic lattice settings. The current status and the most recent results of these analyses is presented.
Submitted by the MICE speakers bureau. If accepted, a member of the collaboration will be selected to present the contribution
 
slides icon Slides MOA21 [1.732 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-MOA21  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
MOA22 Recent Results from MICE on Multiple Coulomb Scattering and Energy Loss ion, scattering, simulation, emittance 16
 
  • J.C. Nugent, P. Soler
    University of Glasgow, Glasgow, United Kingdom
  • R. Bayes
    Laurentian University, Campus Sudbury, Sudbury, Ontario, Canada
 
  Funding: STFC, DOE, NSF, INFN, CHIPP etc
Multiple coulomb scattering and energy loss are well known phenomena experienced by charged particles as they traverse a material. However, from recent measurements by the MuScat collaboration, it is known that the available simulation codes (GEANT4, for example) overestimate the scattering of muons in low Z materials. This is of particular interest to the Muon Ionization Cooling Experiment (MICE) collaboration which has the goal of measuring the reduction of the emittance of a muon beam induced by energy loss in low Z absorbers. MICE took data without magnetic field suitable for multiple scattering measurements in the fall of 2015 with the absorber vessel filled with Xenon and in the spring of 2016 using a lithium hydride absorber. The scattering data are compared with the predictions of various models, including the default GEANT4 model. In the fall of 2016 MICE took data with magnetic fields on and measured the energy loss of muons in a lithium hydride absorber. These data are also compared with model predictions and with the Bethe-Bloch formula.
Submitted by the MICE speakers bureau. If accepted, a member of the collaboration will be selected to present the contribution
 
slides icon Slides MOA22 [4.626 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-MOA22  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUP04 Muon Intensity Increase by Wedge Absorbers for low-E Muon Experiments ion, solenoid, emittance, simulation 32
 
  • D.V. Neuffer, J. Bradley, D. Stratakis
    Fermilab, Batavia, Illinois, USA
 
  Low energy muon experiments such as mu2e and g-2 have a limited energy spread acceptance. Following techniques developed in muon cooling studies and the MICE experiment, the number of muons within the desired energy spread can be increased by the matched use of wedge absorbers. More generally, the phase space of muon beams can be manipulated by absorbers in beam transport lines. Applications with simulation results are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP04  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUP08 Preliminary Design of Electron Target for SRing at HIAF ion, electron, target, cathode 40
 
  • J. Li, Z. Huang, L.J. Mao, M.T. Tang, S. X. Wang, J.C. Yang, X.D. Yang, H. Zhao, L.X. Zhao
    IMP/CAS, Lanzhou, People's Republic of China
 
  A 13 Tm multifunction storage ring dedicated to nucleon and atomic experiment research - the SRing (Spectrometry Ring) is a significant part of the new heavy-ion research complex - HIAF (High Intensity heavy ion Accelerator Facility). In additional to an electron cooler and a gas internal target planned at the SRing, a beam of low temperature electron is also required to collide with the storage beam and to cool the decelerated ion beam at low energy. A magnetic adiabatic expansion is proposed to attain a low temperature by applying a 1.2 T longitudinal magnetic field upon the thermionic cathode at the electron gun. In this paper, preliminary design of the electron target is introduced.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP08  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUP14 Investigation on the Suppression of Intrabeam Scattering in the High Intensity Heavy Ion Beam with the help of Longitudinal Multi-bunch Chain of Electron ion, electron, scattering, storage-ring 58
 
  • X.D. Yang, J. Li, X.M. Ma, L.J. Mao, M.T. Tang, T.L. Yan, H. Zhao
    IMP/CAS, Lanzhou, People's Republic of China
 
  Intrabeam scattering is the main reason of degradation of the beam brightness and shortening of brightness lifetime in the collider, light source and storage ring. The intrabeam scattering presents dissimilar influence in the different facilities. Electron cooling was chose to suppress the effect of intrabeam scattering, another unexpected effect happened during the cooling. The distribution of ion beam quickly deviates from the initial Gaussian type, form a denser core and long tail. The ions standing in the tail of beam will loss soon due to large amplitude. This solution will focus on the investigation on the suppression of intrabeam scattering in the high intensity heavy ion beam in the storage ring with the help of longitudinally modulated electron beam. The stronger cooling was expected in the tail of ion beam and the weaker cooling was performed in the tail of ion beam. The particle in the outside will experience stronger cooling and will be driven back into the centre of ion beam. The ion loss will be decreased and the lifetime will be increased. The intensity of ion beam in the storage ring will be kept and maintain for long time.  
poster icon Poster TUP14 [4.160 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP14  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUP15 Experimental Demonstration of Electron Cooling with Bunched Electron Beam electron, ion, proton, storage-ring 61
 
  • L.J. Mao, J. Li, X.M. Ma, M.T. Tang, J.C. Yang, X.D. Yang, H. Zhao, H.W. Zhao
    IMP/CAS, Lanzhou, People's Republic of China
  • A. Hutton, K. Jordan, T. Powers, R.A. Rimmer, M. Spata, H. Wang, S. Wang, H. Zhang, Y. Zhang
    JLab, Newport News, Virginia, USA
 
  Funding: This work was supported by the Hundred Talents Project of the Chinese Academy of Sciences and National Natural Science Foundation of China (Nos. 11575264, 11475235, 11375245)
Electron cooling at high energy is presently considered for several ion colliders, in order to achieve high luminosities by enabling a significant reduction of emittance of hadron beams. Electron beam at cooling channel in a few to tens MeV can be accelerated by a RF/SRF linac, and thus using bunched electrons to cool bunched ions. To study such cooling process, the DC electron gun of EC35 cooler was modified by pulsing the grid voltage, by which a 0.5-3.5 us of electron bunch length with a repetition frequency of less than 250 kHz was obtained. The first experiment demonstrated cooling coasting and bunched ion beam by a bunched electron beam was carried out at the storage ring CSRm at IMP. A preliminary data analysis has indicted the bunch length shrinkage and the momentum spread reduction of bunched 12C+6 ion beam. A longitudinal grouping effect of coasting ion beam by the electron bunch has also observed. In this paper, we will present the experiment result and its preliminary comparison to the simulation modeling.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP15  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUP17 Design of Stochastic Pick-Ups and Kickers for Low Beta Particle Beams ion, kicker, impedance, proton 68
 
  • B. Breitkreutz, R. Stassen, H. Stockhorst
    FZJ, Jülich, Germany
 
  The COSY facility hosts experiments for the JEDI (Jülich Electric Dipole moment Investigations) collabora-tion. Polarized deuteron beams with a momentum of 970 MeV/c are stored in the ring. To achieve polarization times in the order of several minutes, small emittances and momentum spread are crucial. Therefore, the beam is pre-cooled with the 100-kV electron cooler. To further improve the spin coherence time, cooling during the experiments would be desirable. That way, the beam blow-up due to intra beam scattering could be compen-sated. But since the focusing solenoids in the e-cooler may not be perfectly compensated, it cannot be used to cool during the experiments. The existing stochastic cooling (SC) system is not sensitive at low beam veloci-ties. Thus, it is proposed to build a dedicated SC system for low beta beams. This work presents the proposed sys-tem. It emphasizes the design process of pick-up and kicker hardware. Starting from the slot-ring structures that have been developed for HESR, an optimization towards a high sensitivity at a beta of 0.46 is undertaken.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP17  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THM21 NICA Project: Three Stages and Three Coolers ion, collider, booster, detector 84
 
  • I.N. Meshkov, G.V. Trubnikov
    JINR, Dubna, Moscow Region, Russia
 
  The Nuclotron-based Ion Collider fAcility (NICA) project is under development at JINR. The first and general goal of the project is experimental study of both hot and dense baryonic matter to search for so-called Mixed Phase formation in collisions of heavy relativistic ions. The second goal is spin physics (in collisions of polarized protons and deuterons). The project NICA is developed in three stages. 1st stage, "The Baryonic Matter at Nuclotron", is a fixed target experiment with ions accelerated in the linac and two SC synchrotrons - the Booster and the Nuclotron up to kinetic energy of 4.5 GeV/u (the Centre mass system energy ECMS up to 3.45 GeV/u). The Booster has an electron cooler of the electron energy up to 50 keV. The 2nd stage extends the ECMS from 4 to 11 GeV/u in colliding beams' mode. The Collider will be equipped with both stochastic cooling system and double electron one of electron energy of 0.5 - 2.5 MeV, which are being designed and manufactured at the Budker INP. Stage III - Polarized Beams Mode of The Collider is at the level of the conceptual design. We emphasize on beam dynamics in the NICA machines and a necessity of the cooling methods application.  
slides icon Slides THM21 [8.370 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-THM21  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THA11 The HESR Stochastic Cooling System, Design, Construction and Test Experiments in COSY ion, kicker, pick-up, simulation 89
 
  • R. Stassen, B. Breitkreutz, N. Shurkhno, H. Stockhorst
    FZJ, Jülich, Germany
  • L. Thorndahl
    CERN, Geneva, Switzerland
 
  The construction phase of the stochastic cooling tanks for the HESR has started. Meanwhile two pickups (PU) and one kicker (KI) are fabricated. One PU and one KI are installed into the COSY ring for testing the new stochastic cooling system with real beam at various momenta. Small test-structures were already successfully operated at the Nuclotron in Dubna for longitudinal filter cooling but not for transverse cooling and as small PU in COSY. During the last COSY beam-time in 2017 additional transverse and ToF cooling were achieved. The first two series high power amplifiers were used for cooling and to test the temperature behavior of the combiner-boards at the KI. The system layout includes all components as planned for the HESR like low noise amplifier, switchable delay-lines and optical notch-filter. The HESR needs fast transmission-lines between PU and KI. Beside air-filled coax-lines, optical hollow fiber-lines are very attractive. First results with such a fiber used for the transverse signal path will be presented.  
slides icon Slides THA11 [11.863 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-THA11  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)