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A new code CSRZ was developed to investigate the longitudinal coherent synchrotron radiation (CSR) impedance for a single or a series of bending magnets. To calculate CSR impedance, the mesh method developed by T. Agoh and K. Yokoya[T. Agoh and K. Yokoya, Phys. Rev. ST accel. Beams, 7 (5): 054403 (2004)] was adapted to the case of a curved rectangular chamber with variable bending radius. The method is based on the integration of the parabolic equation in the frequency domain in a curvilinear coordinate system. In the code CSRZ, the curvature of the beam trajectory can be set to be an arbitrary function of the distance along the beam orbit. Thus it allows calculating CSR impedance generated by either a single bending magnet or a series of bending magnets. In this paper, we first describe the code and formalism for CSR calculation. Then we apply the code to calculate the longitudinal CSR impedance using an example appearing in the compact energy recovery linac (cERL) project at KEK.
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