1. Update of Lattice Design for CEPC Main Ring
Yiwei Wang, Yuan Zhang, Chenghui Yu, Jie Gao
CEPC AP meeting, 25 Aug 2017

2. New lattice and DA:
bx*=0.36m
Longer sextupole in ARC: Lsd=1.2m, Lsf=0.6m
Finite length of sextupole in IR: Lhs=Lvs=0.3m, Lsdd=0.1m
Finite length of crab sextupole: Lcrab=1.0m

3. bx*=0.36m
IR upstream
IR downstream
IR geometry

4. Longer sextupole in ARC
DA w/ damping, w/o fluctuation, 100 turns
Hard line bx*=0.36m , Lsext=0.4m
Dashed line bx*=0.36m, Lsf=0.6m, Lsd=1.2m,

5. Finite length of sextupole in IR
DA w/ damping, w/o fluctuation, 100 turns
bx*=0.36m, Lsf=0.6m, Lsd=1.2m, L_IR=0.3m Lsadd=0.1m
Hard line, Ls_IR=0.3m, w/ corr
Dashed line, Ls_IR=0
DotDashed line, Ls_IR=0.3m w/o corr

6. w/o corr. sext

7. Finite length of crab sextupole
DA w/ damping, w/o fluctuation, 100 turns
bx*=0.36m, Lsf=0.6m, Lsd=1.2m, Ls_IR=0.3m,
Hard line, w/o crab
Dashed line, w/ carb, Lcrab=0
DotDashed line, w/ carb, Lcrab=1.0m

8. w/ crab L=0

9. w/ crab L=1.0m

10. Beam stay clear region and beam pipe
Beam pipe of interaction region
Rx=28+7 mm, Ry=28+7 mm
Beam pipe of other region
Rx=28+7 mm, Ry=43+7 mm

11. 相切椭圆
Rx=43+7 mm
Ry=28+7 mm
Ftip  R^2/L
LSD=0.4m
LSD=0.7m
LSD=1.2m

12. Magnets parameters
Join the similar magnets in specific region (ARC, STR, RF, IR)
Same length
Fmax=Max[Abs[Fmax(similar magnets)]]
Rgf=Max[Rgf(similar magnets)]
Same for D and F
Magnets parameters: CEPC_RING_v _Ele_Join_LattInfo_rev2.dat