Keyword: betatron
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TUPOB44 Final 6d Muon Ionization Cooling Using Strong Focusing Quadrupoles ion, emittance, quadrupole, collider 592
 
  • T.L. Hart, J.G. Acosta, L.M. Cremaldi, S.J. Oliveros, D.J. Summers
    UMiss, University, Mississippi, USA
  • D.V. Neuffer
    Fermilab, Batavia, Illinois, USA
  
  Low emittance muon beam lines and muon colliders are potentially a rich source of BSM physics for future experimenters. A normalized transverse muon emittance of 280 microns has been achieved in simulation with short solenoids and a betatron function of 3 cm. Here we use ICOOL, G4Beamline, and MAD-X to explore using a flat 400 MeV/c muon beam and strong focusing quadrupoles to achieve a normalized transverse emittance of 100 microns and finish 6D cooling. The low beta regions, as low as 5 mm, produced by the quadrupoles are occupied by dense, low Z absorbers, such as lithium hydride or beryllium, that cool the beam. Equilibrium transverse emittance is linearly proportional to the beta function. Reverse emittance exchange with septa and/or wedges is then used to decrease transverse emittance from 100 to 25 microns at the expense of longitudinal emittance for a high energy lepton collider. Cooling challenges include chromaticity correction, momentum passband overlap, quadrupole acceptance, and staying in phase with RF.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-TUPOB44  
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WEPOA03 Synchrotron Oscillation Derived From Three Components Hamiltonian ion, synchrotron, heavy-ion, closed-orbit 690
 
  • K. Jimbo
    Kyoto University, Kyoto, Japan
  • H. Souda
    Gunma University, Heavy-Ion Medical Research Center, Maebashi-Gunma, Japan
  
  The Hamiltonian, which was composed of coasting, synchrotron and betatron motions, clarified the synchro-betatron resonant coupling mechanism in a storage ring*. The equation for the synchrotron motion was also obtained from the Hamiltonian. It shows that the so-called synchrotron oscillation is an oscillation around the revolution frequency as well as of the kinetic energy of the on-momentum particle. The detectable synchrotron oscillation is a horizontal oscillation on the laboratory frame.
*K.Jimbo, Physical Review Special Topics - Accelerator and Beams 19, 010102 (2016). 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEPOA03  
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WEA3IO01 Emittance Growth from Modulated Focusing in Bunched Beam Cooling ion, emittance, electron, simulation 833
 
  • M. Blaskiewicz
    BNL, Upton, Long Island, New York, USA
  
  The low energy RHIC electron cooling (LEReC) project at Brookhaven employs a linac to supply electrons with kinetic energies from 1.6 to 2.6 MeV. Along with cooling the stored ion beam the electron bunches create a coherent space charge field which can cause emittance growth. This is the primary source of heating when the cooling is well tuned. An analytic theory of this process is presented and compared with simulations.  
slides icon Slides WEA3IO01 [4.160 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEA3IO01  
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