Keyword: luminosity
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TUY01 Status and Perspectives of the VEPP-2000 Complex positron, collider, electron, injection 6
 
  • Yu. A. Rogovsky, D.E. Berkaev, A.S. Kasaev, I. Koop, A.N. Kyrpotin, A.P. Lysenko, E. Perevedentsev, V.P. Prosvetov, A.L. Romanov, A.I. Senchenko, P.Yu. Shatunov, Y.M. Shatunov, D.B. Shwartz, A.N. Skrinsky, I.M. Zemlyansky, Yu.M. Zharinov
    BINP SB RAS, Novosibirsk, Russia
  • Yu. A. Rogovsky
    NSU, Novosibirsk, Russia
  
  The VEPP-2000 is a mod­ern elec­tron-positron col­lider at BINP. Last sea­son in 2012–2013 was ded­i­cated to the en­ergy range of 160520 MeV per beam. The ap­pli­ca­tion of round col­lid­ing beams con­cept along with the ac­cu­rate orbit and lat­tice cor­rec­tion yielded the high peak lu­mi­nos­ity of 1.21031 cm-2s−1 at 500 MeV with av­er­age lu­mi­nos­ity of 0.91031 cm-2s−1 per run. The peak lu­mi­nos­ity lim­ited only by beam-beam ef­fects, while av­er­age lu­mi­nos­ity – by pre­sent lack of positrons in whole en­ergy range of 1601000 MeV. To per­form high lu­mi­nos­ity at high en­er­gies with small dead time the top-up in­jec­tion is needed. At pre­sent new elec­tron and positron in­jec­tion com­plex at BINP is com­mis­sioned and ready to feed VEPP-2000 col­lider with in­ten­sive beams with en­ergy of 450 MeV. Last cal­en­dar 2014 year was ded­i­cated to the full/par­tial up­grade of com­plex's main parts.  
slides icon Slides TUY01 [4.152 MB]  
 
THPSC16 Analysis of High Order Modes Damping Techniques for 800 MHz Single Cell Superconducting Cavities HOM, cavity, damping, dipole 353
 
  • Ya.V. Shashkov, N.P. Sobenin
    MEPhI, Moscow, Russia
  • M. Zobov
    INFN/LNF, Frascati (Roma), Italy
  
  Funding: Research supported by RFBR grant 13-02-00562/14 and EU FP7 HiLumi LHC - Grant Agreement 284404
The High Lu­mi­nos­ity LHC up­grade pro­gram fore­sees a pos­si­bil­ity of using the sec­ond har­monic cav­i­ties work­ing at 800 MHz for the col­lider bunch length vari­a­tion. Such har­monic cav­i­ties should pro­vide an op­por­tu­nity to vary the length of col­lid­ing bunches. In order to sup­ply the re­quired har­monic volt­age sev­eral sin­gle cell su­per­con­duct­ing cav­i­ties are to be used. Dif­fer­ent cav­ity de­signs and sev­eral higher order mode (HOM) damp­ing tech­niques are being stud­ied in order to re­duce the cav­ity HOM im­pact on the beam sta­bil­ity and to min­i­mize par­a­sitic power losses. In this paper we an­a­lyze and com­pare the HOM elec­tro­mag­netic char­ac­ter­is­tics and re­spec­tive wake po­ten­tial decay rates for cav­i­ties with grooves, fluted and ridged beam pipes. The prob­lem of Lorentz force de­tun­ing is also ad­dressed.