Low emittance

2085MeV
6 wigglers at 19kg. 3 wigglers each in L1 and L5.
CLEO solenoid at 1T
bmad_6wig_nosol_8nm_2085.lat is a variation with antisolenoid off and alternate CLEO solenoid compensation

May 7, 2008 Lattice: /home/dlr/lat/des/CesrTF/6wig/2085/min_emit/bmad_6wig_8nm_2085.lat

Layout: /dlr/layout/layout_antisol_2006_02_23_19kg.bmad (CESR-c)

Energy [GeV] 2.085
Wiggler[T] 2.1
Qx 10.57
Qy 9.62
Qz [6.88 MV] 0.089
Emittance [nm] 7.5nm
Bunch length 12.3mm


  • linear lattice constraints
  • non linear lattice constraints energy offset +- 0.006 and disp

  • lattice file
  • Optical parameters and orbits
    • table
    • Lattice gif and ps (including orbit)
    • Lattice gif and ps (without orbit)

  • RF voltage = 6.88, Qs=-0.089, Bunch length = 12mm


    Tune scan
    Tune scan gif and (initialization) with Qz = -0.089


    Dynamic aperture
    The dynamic aperture gif ( ps ) and (initialization) 20080706-1 .Qx=10.57 Qy=9.6,Qz=-0.089. The horizontal and vertical tunes are shifted in order to avoid the synchrobetatron line that shifts with the lower synchrotron tune. (See tune scans)

    Dynamic aperture is computed for fractional energy offset of 0%, 0.5% and 1%. Tracking is based on symplectic integration through the same wiggler map as for CESR-c calculations. Particles are considered lost if their amplitude >> the real physical aperture. (This seems to be the way linear collider damping ring people report dynamic aperture.)


    Analyzer output

  • Synchrotron radiation data

    chamber profile: (near L3) and table for ring
    &synrad_params
    	sr_param%lat_file = "/home/dlr/lat/bmad_6wig_nosol_8nm_2085.lat"  ! Input lattice.
    	sr_param%i_beam = 0.1            ! Beam current.
    	sr_param%epsilon_y = 10e-12      ! Vertical emittance.
    	seg_len = 0.01                    ! Segment length for calculation.
            beam_direction = -1               ! -1 = track backwards only, 
                                             !  0 = track both directions, 1 = forward.
    	wall_file = "wall.dat"       ! "NONE" => Use a wall with a fixed offset from the beam.
    	wall_offset = 0.0448             ! Used when wall_file is set to "NONE"
            forward_beam  = "POSITRON"       ! "POSITRON" or "ELECTRON"
            backward_beam = "ELECTRON"       !  This is important if there are elsep elements.
    /
    
    Electrostatic separators are off
    (Tabulated data includes details of power, twiss parameters, and magnetic element where photons are incident on the chamber)