CTA high tune low emittance. 2085MeV. 12 wigglers. 19kg. 6 wigglers in L0. cesrta_01

November 12, 2008 Lattice: /nfs/cesr/user/dlr/lat/des/CesrTF/2085/cta_2085mev_20081107/
same as /home/dlr/lat/cta/cta_2085mev_20081107.lat
Layout: /dlr/layout/cesrta_01.bmad - Up to date as of 2008

Energy [GeV] 2.085 Wiggler[T] 1.9 Qx 14.57 Qy 9.6 Qz [4.5MV] 0.055 Emittance [nm] 2.6 Momentum compaction 6.76e-3 linear lattice constraints non linear lattice constraints energy offset +- 0.004 and disp lattice file BMAD and MAD8 format and MADX format and XSIF format Optical parameters and orbits table Lattice gif and ps RF voltage = 4.5, Qs=-0.055, Bunch length = 12.2mm Tune scan Tune scan gif and (initialization) with Qz = -0.055, sb_jobs/081112/ Dynamic aperture The dynamic aperture gif ( ps ) and (initialization) .Qx=14.57 Qy=9.6,Qz=-0.055. da_jobs/20081112/ The horizontal and vertical tunes are shifted in order to avoid the synchrobetatron line that shifts with the lower synchrotron tune. (See tune scans) No multipole or misalignment errors. Include multipoles for all quads (Mark II, PEM, 48, Q2). Insert vertical survey errors (/home/dlr/cesrv/quadOffset_BendRoll_090123.dat) Flatten with cesrv and write corrected lattice ( /home/dlr/lat/cta/SURVEYFLATTEN_CTA_2085MEV_20081107.LAT) Include multipoles (/home/dlr/layout/ring_multipoles.bmad) The dynamic aperture gif ( ps ) and (1000 turns) /home/dlr/da_jobs/20090205/da.in . Is 1000 turns enough? If we track for 10,000 turns we have gif ( ps ) and (10000 turns) /home/dlr/da_jobs/20090208/da.in . Almost no difference Energy range 0.01,0.015 0.02 gif ( ps ) and (1000 turns) /home/dlr/da_jobs/20090210/da.in . 0.015< Energy aperture < 0.02 Energy range 0.015,0.016 0.017 gif ( ps ) and (100 turns) /home/dlr/da_jobs/20090210-1/da.in . Energy aperture > 0.017 Energy range 0.017,0.018 0.019 gif ( ps ) and (100 turns) /home/dlr/da_jobs/20090210-2/da.in . Energy aperture < 0.018 Energy range 0.0,0.005 0.001 - Delta f = 28kHz - (RF frequency 28kHz from nominal -> Delta E /E = 0.0083 energy offset) gif ( ps ) and /home/dlr/da_jobs/20090220/da.in . Energy aperture < 0.0083+0.01 Energy range 0.006 0.007 0.008 - Delta f = 28kHz - (RF frequency 28kHz from nominal -> Delta E /E = 0.0083 energy offset) gif ( ps ) and /home/dlr/da_jobs/20090220-1/da.in . Energy aperture < 0.0083+0.007 = 0.0153 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.) The smooth yellow curve corresponds to 3sigma, where sigma is the rms size of the "injected" beam, which is again the custom of damping ring afficiondos. The horizontal emittance of the injected beam is assumed to be 1000nm, and fully coupled so that the vertical emittance is half the horizontal (500nm), just like for the real ILC damping rings. And that is real physical emittance, not normalized. Analyzer output Synchrotron radiation data