Author: Burov, A.V.
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MOP22 A Dedicated Wake-Building Feedback System to Study Single Bunch Instabilities in the Presence of Strong Space Charge 135
  • R. Ainsworth, A.V. Burov, N. Eddy, A. Semenov
    Fermilab, Batavia, Illinois, USA
  Recent advances in the theoretical understanding of beam stability in the presence of strong space charge, has suggested a new class of instabilities known as convective instabilities. A novel approach to excite and study these instabilities will be to install a ‘waker’ system, a dedicated wake-building feedback system. The System was installed in the Fermilab Recycler and commissioned during 2021. The first results are presented.  
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About • Received ※ 19 October 2021 — Revised ※ 20 October 2021 — Accepted ※ 26 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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