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The piece of NESTOR vacuum chamber with the ceramic insertion for DC-monitorand RF-shields was simulated by using both transient and wake field solvers ofCST Studio Suite. For a 6 mm gap between two RF-shields the contributions ofthe assembly considered to the longitudinal broadband (BB) impedance Z/n andthe loss factor kloss are 0.71 Ohm and 0.21 V/pC, correspondingly. Theseestimates are the second largest after those of the RF-cavity that wereobtained till now for the NESTOR ring components.  Contributions from a beam position monitor (BPM) are also obtained bysimulation and compared with analytical estimates obtained earlier.  We also present in the paper the frequency content of longitudinal impedancein the frequency range from 0 to 16 GHz for all ring components considered.

Simulation of BPM and DC-monitor assembly for the NESTOR storage ring by CST Studio Suite