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positron

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TUCHA01 Accelerator Aspects of the Precision Mass Measurement Experiments at the VEPP-4M Collider with the KEDR Detector polarization, electron, collider, resonance 11
 
  • S. A. Nikitin
    BINP SB RAS, Novosibirsk
  One of most important constituents of the mass measurement experiments at colliders is a precision absolute beam energy calibration. Two methods for particle energy measurement are realized at the electron-positron collider VEPP-4M: one based on the resonant depolarization technique and another using the Back Compton Scattering. KEDR detector measurements of the J/Psi-, Psi' – mesons and the tau-lepton masses performed with the help of these methods is better in accuracy now in the world. Peculiarities of the beam energy calibraton as well as of the mass measurement experiments are represented in the viewpoint of requirements on beam parameters and accelerator systems.  
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TUPSA012 TBA Scheme with Ion/Proton Driving Beam proton, ion, electron, synchrotron 62
 
  • A. A. Mikhailichenko
    CLASSE, Ithaca, New York
  • E. G. Bessonov
    LPI, Moscow
  We are considering a Two Beam Accelerator scheme for electron-positron collisions with Ion/Proton driving beam. We compare the proposed scheme and the CLIC one coming to conclusion, that Ion/Proton driving TBA scheme looks more attractive. Existences of big proton accelerators in few laboratories give a new boost to reconsider the baseline for post LHC era. These labs are FERMILAB, BNL, CERN and IHEP at Protvino, Moscow region. Protvino could emerge as one advantageous place for resurrection of proton synchrotron in existing ~20-km long tunnel. This synchrotron was planned as a booster for 2x2 TeV UNK complex.

* K. Hubner, CERN/PS 92-43(DI), CLIC Note No.176,1992.
** E. A. Perevedentsev, A. N. Skrinsky, Preprint BINP 79-80, Novosibirsk, 1979.

 
 
WECHC01 Advance in the LEPTA Project electron, focusing, gun, vacuum 166
 
  • A. G. Kobets, E. V. Ahmanova, M. K. Eseev, V. Karpinsky, V. I. Lokhmatov, V. N. Malakhov, I. N. Meshkov, V. Pavlov, A. Yu. Rudakov, A. A. Sidorin, S. Yakovenko
    JINR, Dubna, Moscow Region
  The progress since RuPAC'2008 in Low Energy Positron Toroidal Accumulator (LEPTA) project at JINR is reported. The significant development of the facility includes an increase of circulating beam life time, fabrication and commissioning of improved injection system, manufacturing of positron transfer channel, test of low energy positron injector and positron trap. First positron injection into the ring is under preparation.  
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WEPSB001 Research of Photon Emission of 120 GeV Channeling Positrons radiation, multipole, photon, simulation 172
 
  • V. A. Maisheev, Y. A. Chesnokov, P. N. Chirkov, I. A. Yazynin
    IHEP Protvino, Protvino, Moscow Region
  • D. Bolognini, S. Hasan, M. Prest
    Università dell'Insubria & INFN Milano Bicocca, Como
  • E. Vallazza
    INFN-Trieste, Trieste
  The process of radiation of 120-GeV positrons moving in a channeling regime in (011) and (111) plane of a single crystal was considered. At the beginning on the basis of the theory of nonlinear oscillations the trajectory of moving positrons at different initial conditions were derived. Then taking into account the nonlinearity of motion the distribution function over oscillation amplitudes of channeling particles was found. After this the intensity of radiation in thin crystal at different initial conditions was calculated with the help of two various methods. The received results have formed a basis for calculation of positron energy losses in not thin crystals taking into account the processes of dechanneling and multiplicity of generation of photons. Research was executed within the frame of experiment INSURAD ( the beam line 4Н, SPS, CERN). The calculations are in the good consent with preliminary results of this experiment. The received results can be used for creation of powerful sources of radiation and for collimation of positron beams in linear colliders.  
 
WEPSB034 Wideband BPM Electronics for the VEPP-4M Collider electron, storage-ring, collider, pick-up 245
 
  • E. A. Bekhtenev, G. V. Karpov
    BINP SB RAS, Novosibirsk
  New beam position monitor (BPM) FPGA-based electronics has been developed and tested at the VEPP-4M electron-positron collider. The VEPP-4M operates with two electron and two positron bunches. Compared to the old BPM electronics the new one can measure the position of each of four bunches with any BPM of storage ring including the BPMs near interaction point. Wide bandwidth of electronics (200 MHz) allows the separate measurements of electron and positron bunches with time interval between bunches up to 20 ns. BPM system works at two modes: slow closed orbit measurements and turn-by-turn measurements. We present details of system design and operation