Lattice Design for CEPC Main Ring Scheme
"Explore the lattice design for the double ring scheme of the CEPC main ring, including parameters, survey details, and regions covered. Learn about the intricate design elements and configurations presented during the CEPC AP meeting in 2016."
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Lattice design for double ring scheme of CEPC main ring Yiwei Wang, Feng Su, Chenghui Yu, Dou Wang, Jie Gao CEPC AP meeting, 23 Dec 2016
Outline CEPC parameters for C=100km Lattice design and survey for the Arc region Lattice design and survey for the RF region Lattice design and survey for the IR region
CEPC parameters for C=100km wangdou20161202-100km Pre-CDR H-high lumi. H-low power W Z Number of IPs Energy (GeV) Circumference (km) SR loss/turn (GeV) Half crossing angle (mrad) Piwinski angle Ne/bunch (1011) Bunch number Beam current (mA) SR power /beam (MW) Bending radius (km) Momentum compaction (10-5) IPx/y (m) Emittance x/y (nm) Transverse IP(um) x/ y/IP RF Phase (degree) VRF(GV) fRF(MHz) (harmonic) Nature z(mm) Total z(mm) HOM power/cavity (kw) Energy spread (%) Energy acceptance (%) Energy acceptance by RF (%) n Life time due to beamstrahlung_cal (minute) F (hour glass) Lmax/IP (1034cm-2s-1) 2 2 2 2 2 2 120 54 3.1 0 0 3.79 50 16.6 51.7 6.1 3.4 120 100 1.67 15 2.9 0.97 644 29.97 50 11 1.3 120 100 1.67 15 2.9 0.97 425 19.8 33 11 1.3 80 100 0.33 15 3.57 1.05 1000 50.6 16.7 11 3.1 45.5 100 0.034 15 5.69 0.46 10520 232.1 8.0 11 3.3 0.12/0.001 0.93/0.0049 10.5/0.07 0.0075/0.054 160.8 0.11 45.5 100 0.034 15 5.69 0.46 65716 1449.7 50 11 3.3 0.12/0.001 0.93/0.0049 10.5/0.07 0.0075/0.054 160.8 0.11 0.8/0.0012 6.12/0.018 69.97/0.15 0.118/0.083 153.0 6.87 650 2.14 2.65 3.6 (5cell) 0.13 2 6 0.23 47 0.144 /0.002 1.56/0.0047 15/0.097 0.0126/0.083 131.2 2.22 650 (217800) 2.72 2.9 0.64 (2cell) 0.098 1.5 2.2 0.26 52 0.144 /0.002 1.56/0.0047 15/0.097 0.0126/0.083 131.2 2.22 650 (217800) 2.72 2.9 0.42 (2cell) 0.098 1.5 2.2 0.26 52 0.1 /0.001 2.68/0.008 16.4/0.09 0.0082/0.055 149 0.63 650 (217800) 3.8 3.9 1.0 (2cell) 0.065 650 (217800) 3.93 4.0 3.93 4.0 1.0 (1cell) 0.037 6.25(1cell) 0.037 1.5 0.26 1.1 0.18 1.1 0.18 0.68 2.04 0.95 3.1 0.95 2.05 0.84 4.08 0.91 11.36 0.91 70.97
Lattice design and survey for the Arc region FODO cell Dispersion Suppressor ex=1.53e-09 m*rad, rhoB_i=12576 m, rhoB_o=12576.6 m LB_i=37.41351251093299, LB_o=37.4152975067589
Lattice design and survey for the RF region An electrostatic separator, combined with a dipole magnet to avoid bending of incoming beam (ref: Oide, ICHEP16) x=0.6 m, =0, Dx=0, Dx =0
L*= 1.5m x*= 0.144mm y*= 2mm GQD0= -200T/m GQF1= 200T/m LQD0=1.69m LQF1=0.90m FFSR Lattice Ec < 100 keV within 280m Phx~0.25+2.5 Phy~0.25+2.5+0.125
L*= 1.5m x*= 0.144mm y*= 2mm GQD0= -200T/m GQF1= 200T/m LQD0=1.69m LQF1=0.90m FFSL Lattice Ec < 300 keV within 160m
GEO matching Initial idea is to match the GEO with only dipoles in one direction. This section should also has the function of horizontal chromaticity correction. Many ways were tried but all failed as the initial deviation is larger than 0.6m. We have to use inverse direction dipole to bend the orbit back A longer matching section will be also necessary.
Summary A lattice design and survey for the Arc/RF/IR region prepared The geometry of the double ring need to be carefully matched.
