Author: Alexahin, Y.I.
Paper Title Page
MOP21 3D Symplectic Space Charge Implementation in the Latest Mad-X Version 129
  • F. Schmidt, A. Latina, H. Renshall
    CERN, Geneva, Switzerland
  • Y.I. Alexahin
    Fermilab, Batavia, Illinois, USA
  In 2018 as part of a collaboration between CERN and FNAL, the space charge (SC) implementation has been upgraded in a test version of MAD-X. The goal has been to implement the 3D symplectic SC kick together with a number of new features and benchmark it with earlier MADX-SC versions. Emphasis has given to the use of the Sigma Matrix approach that allows to extend MAD-X optics calculations. In the meantime, significant effort has been made to fully debug and optimize the code and in particular to achieve a speed-up of the simulations by a factor of 2. The code has been ported to the latest MAD-X version, the elaborated set-up procedures have been automated and a user manual has been written.  
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About • Received ※ 05 October 2021 — Revised ※ 21 October 2021 — Accepted ※ 11 November 2021 — Issue date ※ 12 April 2022
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Compensation of Ultimate Space Charge with Electron Lenses  
  • E.G. Stern, Y.I. Alexahin, A.V. Burov, V.D. Shiltsev
    Fermilab, Batavia, Illinois, USA
  Space-charge effects set stringent limits on the performance of frontier high power proton accelerators. They manifest themselves in beam losses and emittance growth. Compensation of the space-charge effects in positively charged proton beams is possible by propagating the beam through negatively charged electron lenses which employ high brightness magnetized and externally controlled electron beams. While the method was previously assessed theoretically and in simplified tracking simulations, it has never been modeled by PIC codes to get reliable quantitative estimates of the efficiency of the compensation. Here we report on the first evidence using the Synergia particle-in-cell simulation code that a suitable number of electron lens type elements can protect the machine from emittance growth caused by space-charge forces in a model beam optics lattice with imperfections. For effective electron lens space-charge compensation, the compensating elements must be placed within not too large betatron phase advance from each other. Electron lens elements could become the basis of new generation of high power proton and ion rapid cycling synchrotrons.  
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