Keyword: simulation
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MOB03 Design and Status of the Super Separator Spectrometer for the GANIL SPIRAL2 Project multipole, status, dipole, heavy-ion 23
  • J.A. Nolen, S.L. Manikonda
    ANL, Argonne, USA
  • M. Authier, A. Drouart, J. Payet
    CEA/DSM/IRFU, France
  • O. Delferrière
    CEA/IRFU, Gif-sur-Yvette, France
  • J. Laune
    IPN, Orsay, France
  • F. Lutton, H. Savajols, M. Souli, M.-H. Stodel
    GANIL, Caen, France
  Funding: This work is partially supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357.
The Super Separator Spectrometer (S3) is a device designed for experiments with the very high intensity stable heavy ion beams of the superconducting linear accelerator of the SPIRAL2 Project at GANIL. S3 is designed to combine high acceptance, a high degree of primary beam rejection, and high mass resolving power to enable new opportunities in several physics domains, e.g. super-heavy and very-heavy nuclei, spectroscopy at and beyond the drip-line, isomers and ground state properties, multi-nucleon transfer and deep-inelastic reactions. The spectrometer comprises 8 large aperture multipole triplets (7 superconducting and 1 open-sided room temperature), 3 magnetic dipoles, and 1 electrostatic dipole arranged as a momentum achromat followed by a mass separator. A summary of the beam-optical simulations and the status of the main spectrometer components will be presented with special emphasis on the design of the superconducting multipole triplets.
slides icon Slides MOB03 [2.745 MB]  
MOB04 Argonne In-flight Radioactive Ion Separator dipole, ion, multipole, target 24
  • S.L. Manikonda, M. Alcorta, B. Back, J.A. Nolen, R.C. Pardo, E. Rehm, G. Savard, D. Seweryniak
    ANL, Argonne, USA
  • B. Erdelyi
    Northern Illinois University, DeKalb, Illinois, USA
  Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357
The Argonne In-flight Radioactive Ion Separator (AIRIS) is a new large recoil separator that is being designed as a part of proposed future upgrade of the ATLAS facility to provide at least 10 times more collection efficiency than the existing system. In combination with other proposed upgrades it will provide a 2 orders of magnitude gain in the intensity for the in-flight produced secondary beams compared to the existing facility. The resulting unprecedented intensities for the recoil beam open new opportunities in several physics domains, e.g. gamma ray spectroscopy after secondary reactions, reactions for rp‐, νp‐, αp‐ processes and CNO cycle. The proposed design for the AIRIS device is based on four multipole magnets and four dipole magnets arranged in a so called broadband spectrometer configuration. This arrangement will be followed by two RF cavities to provide further selection based on velocity differences between the primary beam tail and the recoiling RIB. The advantages of such a design and key parameters will be discussed. We will demonstrate the performance of the device for few representative reaction cases that can be studied using AIRIS.
slides icon Slides MOB04 [1.626 MB]  
PO13 Longitudinal Beam Motion in the KEK Digital Accelerator: Tracking Simulation and Experimental Results space-charge, induction, acceleration, synchrotron 83
  • X. Liu
    Department of Energy Sciences, Tokyo Institute of Technology, Yokohama, Japan
  • T. Adachi
    Sokendai, Ibaraki, Japan
  • S. Harada
    Tokyo City University, Tokyo, Japan
  • T. Iwashita
    KEK, Ibaraki, Japan
  • K. Takayama, T. Yoshimoto
    TIT, Yokohama, Japan
  Beam commissioning in the KEK Digital Accelerator*, which is a small scale induction synchrotron (IS), has been conducted since the middle of 2011. Longitudinal beam motion in the induction synchrotron, which utilizes induction cells (IC) for acceleration and confinement, is characterized as barrier bucket acceleration. . These ICs are driven by the switching power supply (SPS). Pulse voltage is fully managed by the gate control for solid-state switching elements in the SPS, where FPGAs and DSPs take a key role**. A tracking code has been developed to understand the longitudinal motion affected by longitudinal space charge forces, under programmed settings of confinement and acceleration voltage. This code, where the trigger control scenario is fully implemented, calculates temporal evolution of momentum and phase of macro-particles. The simulation result has well reproduced beam commissioning results, such as bunch squeezing experiment and barrier bucket acceleration. In addition, the code is going to be applied to explain the rapid growth of micro-bunch structure in the injected ion bunch.
* T. Iwashita et al., “KEK Digital Accelerator” , Phys. Rev. ST-AB 14, 071301 (2011). And K.Takayama et al., in this conference.
** S.Harada, Ms. Thesis (TCU) (2011).
PO16 MULTIPHYSICS AND PRESSURE CODE ANALYSIS FOR QUARTER WAVE β=0.085 AND HALF WAVE β=0.29 RESONATORS niobium, cavity, target, radio-frequency 92
  • S.J. Miller, J. Binkowski, A. Facco, M.J. Johnson, Y. Xu
    FRIB, East Lansing, Michigan, USA
  Funding: U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
The driver linac design for the Facility for Rare Isotope Beams (FRIB) at Michigan State University (MSU) makes use of four optimized superconducting radio frequency (RF) resonators to accelerate exotic ions to 200 MeV/μ. The RF resonators were optimized using computer simulations for all expected physical encounters and corresponding electrical resonant frequency changes. Principal guidance from the ASME boiler and pressure vessel code (BPVC) were applied.
poster icon Poster PO16 [0.535 MB]  
PO17 Simulation of Electron and Ion Dynamics in an EBIS ion, electron, background, space-charge 97
  • L. Zhao, E.G. Evstati, J.S. Kim
    Far-Tech, Inc., San Diego, California, USA
  • E.N. Beebe, A.I. Pikin
    BNL, Upton, Long Island, New York, USA
  Funding: Grant supported by DOE office of Nuclear Physics
To model the dynamics of the ions in an Electron Beam Ion Source (EBIS), a time-dependent, self-consist particle-in-cell Monte Carlo code (EBIS-PIC) has been developed by FAR-TECH, Inc. The energetic background electron beam is modeled by PBGUNS ( by dividing the long beam path into several segments to resolve the big length-to-radius spatial scaling problem. The injected primary ions and ionized neutral gas ions are tracked using Monte Carlo method which includes the ionization, charge-exchange and Coulomb collisions with the electron beam and the neutral gas in the potential well, which is calculated by solving the Poisson equation each time step. EBIS-PIC has been able to predict the spatial and velocity space distributions and the evolution of the charge state distribution (CSD) of trapped ions in EBIS devices operating in fast or slow trapping mode. The physical model of EBIS-PIC code and the simulations of the trapping and charge-breeding of injected Cs+1 ions on the Test EBIS* at BNL will be presented. The simulation results have shown good consistency with the experiments.
* S. Kondrashev, J.G. Alessi, E.N.Beebe, C. Dickerson, P.N.Ostroumov, A. Pikin, G. Savard, NIMPR. A, 642 (2011), 18-24.
TUA02 A Cost-Effective Energy Upgrade of the ALPI Linac at INFN-Legnaro linac, ion, cavity, ion-source 106
  • G. Bisoffi, M. Comunian, A. Facco, A. Galatà, P. Modanese, R. Pengo, A. Pisent, A.M. Porcellato, S. Stark
    INFN/LNL, Legnaro (PD), Italy
  • B.B. Chalykh
    ITEP, Moscow, Russia
  The ALPI SC linac at INFN-LNL is being constantly upgraded in terms of maximum beam energy (Ef) and current, made available for experiments. Presently, a liquid-N cooling scheme is being applied to the RF power couplers of the 16 full Nb resonators, to keep them locked at 5 MV/m, vs. present 3 MV/m. A further upgrade of the 44 “medium beta section” cavities, changing the cavity Cu substrates, was prototyped and is reported at this conference: however it is not fully funded yet and is extremely time-consuming. A cost-effective Ef upgrade is proposed here: to move 2 SC buncher cryostats, which house a single working SC QWR but were designed for 4, at the end of ALPI, equipping them with 4 Nb/Cu QWRs each (new bunchers would either be NC QWRs or a single SC cavity cryostat). The contribution of these cryostats to Ef would be extremely effective: e.g. a Ef~10 MeV/A (Ibeam≥ 1 pnA) Pb beam, a very attractive tool for the Nuclear Physics community, is achievable. A being performed upgrade of ALPI cryoplant, expected to increase the refrigeration capability by ~25%, makes this change possible today. Details of this solutions, as well as its limits, will be presented and discussed  
slides icon Slides TUA02 [3.722 MB]  
WEB04 Electron and Ion Beam Dynamics in the CARIBU EBIS Charge Breeder ion, electron, ion-source, acceleration 172
  • C. Dickerson, S.A. Kondrashev, B. Mustapha, P.N. Ostroumov
    ANL, Argonne, USA
  • A.I. Pikin
    BNL, Upton, Long Island, New York, USA
  Funding: This work is supported by the U.S. Department of Energy, Office of Nuclear Physics, under contract number DE-AC02-06CH11357.
An Electron Beam Ion Source (EBIS) is being built to charge breed ion beams from the Californium Rare Isotope Breeder Upgrade (CARIBU) for acceleration in the Argonne Tandem Linear Accelerator System (ATLAS) at Argonne National Laboratory (ANL). The overall efficiency of the source and charge breeder system is important since CARIBU will produce many low intensity radioactive ion species. Simulations of the electron and ion beam dynamics have been used to determine the system’s expected performance. The details of these simulations and results will be presented.
slides icon Slides WEB04 [1.362 MB]  
THB03 Design Sudy for Front-End System at Rare Isotope Science Project (RISP) rfq, ion, ECR, emittance 207
  • E.-S. Kim
    KNU, Deagu, Republic of Korea
  • J. Bahng, J.G. Hwang, S.W. Jang
    Kyungpook National University, Daegu, Republic of Korea
  • B. Choi, D. Jeon, B. Kim, H. Kim, S.K. Kim
    IBS, Daejeon, Republic of Korea
  Heavy ion beams of 400 kW and 70 kW are generated at the RISP by in-flight and ISOL methods, respectively. Front-End system in the RISP consists of 28 GHz superconducting ECR-IS with 10 keV/u, LEBT with two-bends and a multi-harmonic buncher, a RFQ with 81.25 MHz and 300 keV/u, and MEBT with two re-bunchers. The design studies have been performed to optimize the beam and accelerator parameters to meet the required design goals. It is shown that the front-end simulations results can provide the two-charge state beams up to uranium to upstream linac with the required beam emittances. In this paper, we present the design results for the front-end system and on the beam dynamics.  
slides icon Slides THB03 [1.942 MB]