THO1A  —  Beam Dynamics in High-Intensity Linacs   (30-Sep-10   09:00—10:20)

Chair: A.M. Lombardi, CERN, Geneva

Paper Title Page
THO1A01 Beam Dynamics Simulation in SARAF Phase-I Proton/Deuteron 4 MeV Linac Commissioning 543
 
  • J. Rodnizki, A. Kreisel
    Soreq NRC, Yavne
 
 

The SARAF accelerator is designed to accelerate both deuteron and proton beams up to 40 MeV 2mA. Phase I of SARAF consists of a 4-rod RFQ (1.5 MeV/u) and a prototype superconducting module (PSM) housing 6 half-wave resonators (HWR) and 3 superconducting solenoids (4-5 MeV). Beam dynamics TRACK simulation for a proton and a deuteron beam, tailored to the present available field amplitude at each cavity were used to evaluate and tune the linac. The simulation is a key factor to reach a stable high intensity CW beam. The ions energy spectra were measured using the Rutherford scattering technique. This technique is used to tune the cavities to the desired amplitude and phase. The measured energy gain and the energy spread at the RFQ exit and along the PSM were in good agreement with the beam dynamics simulations. Following field flatness modification at the last section of the 4-rod RFQ the transmission curve through the RFQ and the PSM as function of the electrode voltage is similar to the simulations. A HWR was used as a buncher and the measured beam energy spread as function of the bunching voltage was used to qualitatively estimate the longitudinal emittance.

 

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THO1A02 Beam Measurement and Simulation in J-PARC Linac 548
 
  • M. Ikegami
    KEK, Ibaraki
  • A. Miura, H. Sako, G.H. Wei
    JAEA/J-PARC, Tokai-mura
 
 

We report the present status of the beam commissioning for J-PARC linac and our effort to understand the experimental results obtained in the course of the commissioning with the help of particle simulations.

 

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THO1A03 Beam Measurement and Simulation at the SNS 551
 
  • A.P. Shishlo
    ORNL, Oak Ridge, Tennessee
 
 

The overview of the Spallation Neutron Source (SNS) linac lattice, diagnostics, and beam dynamic is presented. The models and model based tuning procedures of the warm and superconducting parts of the SNS linac are discussed. There are significant discrepancies between predicted by simulations and measured losses in the superconducting part of the linac. The possible reasons for these losses and their relation to the beam dynamics are discussed.

 

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THO1A04 Advanced Beam Dynamics Simulations with the DYNAMION Code for the Upgrade and Optimization of the GSI-UNILAC 556
 
  • S.G. Yaramyshev, W.A. Barth, G. Clemente, L.A. Dahl, L. Groening, S. Mickat, A. Orzhekhovskaya, H. Vormann
    GSI, Darmstadt
  • A. Kolomiets, S. Minaev
    ITEP, Moscow
  • U. Ratzinger, R. Tiede
    IAP, Frankfurt am Main
 
 

With the advanced multi-particle code DYNAMION it is possible to calculate beam dynamics in linear accelerators and transport lines under space charge conditions with high accuracy. Special features as data from the real topology of RFQ electrodes, drift tubes, quadrupole lenses, misalignment and fabrication errors and consideration of field measurements lead to reliable results of the beam dynamics simulations. Recently the DYNAMION code is applied to the upgrade and optimization of the UNILAC as an injector for the Facility for Antiproton and Ion Research at Darmstadt (FAIR). An operation of the FAIR requres for the increase of the beam- intensity and -brilliance coming from the UNILAC (up to factor 5). End-to-end simulations for the whole linac (from ion source output to the synchrotron entrance) allow for the study and optimization of the overall machine performance as well as for calculation of the expected impact of different upgrade measures, proposed to improve beam brilliance. The results of the beam dynamics simulations by means of the DYNAMION code are compared with the recent measurements, obtained after upgrade of the High Current Injector (GSI-UNILAC-HSI) in 2009.

 

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