Author: Lysenko, A.P.
Paper Title Page
WEZA01 Round Beam Collisions at VEPP-2000* 1926
 
  • Y.M. Shatunov, D.E. Berkaev, A.N. Kirpotin, I. Koop, A.P. Lysenko, I. Nesterenko, E. Perevedentsev, Yu. A. Rogovsky, A.L. Romanov, P.Yu. Shatunov, D.B. Shwartz, A.N. Skrinsky, I. Zemlyansky
    BINP SB RAS, Novosibirsk, Russia
 
  The idea of round beams col­li­sion was pro­posed more than 20 years ago for the Novosi­birsk Phi-fac­to­ry de­sign. It re­quires equal emit­tances, equal small frac­tion­al tunes, equal beta func­tions at the IP, no be­ta­tron cou­pling in the col­lid­er arcs. A 90° ro­ta­tion at each pas­sage of the trans­verse os­cil­la­tion plane by means of solenoids in the in­ter­ac­tion re­gions pro­vides con­ser­va­tion of the lon­gi­tu­di­nal com­po­nent of the an­gu­lar mo­ment. Thus the trans­verse mo­tion be­comes one-di­men­sion­al. Such a scheme helps to elim­i­nate all be­ta­tron cou­pling res­o­nances that are of cru­cial im­por­tance for beam-beam tune shift sat­u­ra­tion and life­time degra­da­tion. Only re­cent­ly, the round beam con­cept was suc­cess­ful­ly test­ed at the elec­tron-positron col­lid­er VEP­P2000 at the en­er­gy of 510 MeV. De­spite the low en­er­gy a high sin­gle bunch lu­mi­nos­i­ty of 1031 cm-2s−1 was achieved to­geth­er with a max­i­mum tune shift as high as 0.1. At pre­sent the work is in progress to in­crease the en­er­gy of the col­lid­er to ex­plore the range be­tween 510 MeV and 1 GeV in col­li­sion.  
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