1. Report on Electron Polarization Study
The same electron ring optics with similar closed orbit distortions is used for spin tracking simulation in codes of SLICKTRACK and ZGOUBI.
It shows a factor of ~2 difference in the depolarization time. This could be true because more spin resonances may appear because of higher-order harmonics in the orbital motion in ZGOUBI.
Synchrotron motion plays an important role in the depolarization time of electron polarization. Fast synchrotron motion, i.e. large synchrotron tune, means less time exposure in the resonances.
Longitudinal spin matching is implemented by having opposite polarities of solenoids in two spin rotators in the same straight. But we are still lack of horizontal spin matching. After performing horizontal spin matching, we should expect an improvement of depolarization time.

2. Electron Ring Optics
Emittance-reduced baseline design of the electron ring is used for spin tracking simulation
Compensation scheme I (v1)
2 sextupole families for linear chromaticity correction only, 30 cells in each arc
No local final focusing chromatic correction
Geometric emittance: GeV. Betatron tunes are and
(-7.8, +5.6) σp/p
±20σx

3. SLICKTRACK / ZGOUBI Spin tune scan in SLICKTRACK
Spin tracking in ZGOUBI
Polarization lifetime is 6.8 hours.
Tunes calculated from SLICK: x=0.237, y=0.146, s=
The depolarization time
at the optimum spin tune spin ~ 0.01
Polarization lifetime is 9.5 hours.

4. Depolarization vs. Synchrotron Motion
Synchrotron tune
keeps all parameters constant,
increases the harmonic number h from 1816 to 3416,
results in a change of synchrotron tune from to
Spin tracking in the same lattice with both horizontal and vertical quadrupole misalignments introduced