Main parameters of dipoles of CSRm and .CSRe are given in Table 1. In order to reach the necessary fielduniformity at different field levels, a so-called modified H type dipole was designed in CSRm. On the polesurface center an air circle was made to cont Main parameters of dipoles of CSRm and .CSRe are given in Table 1. In order to reach the necessary fielduniformity at different field levels, a so-called modified H type dipole was designed in CSRm. On the polesurface center an air circle was made to cont