; Gao Jie] CAS, Inst High Energy Phys, Beijing 100049, Peoples R China
In this paper, we have found a new set of parameters for the short two-stage ILC bunch compressors. The RF sections are both in the accelerating phase rather than the decelerating phase to improve the accelerating efficiency. We have also studied the CSR related issues. The results show that the microbunch instability exists extensively in the second bunch compressor, but the emittance dilution is small due to the relatively long bunch.