Research and measurement of the influence on the beam parameters by DC clearing electrodes

The expression of the DC clearing electrode field is derived by the conformal transformation method. The influence on the beam parameters by DC clearing electrode fields is analyzed. As examples, the vertical orbit change is induced by the dipole field, the betatron tune shift is induced by the quadrupole field, the additional corrected chromaticity is induced by the sexupole, and so on. several measurement results are given.