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We have simulated the performance of the Josephson Travelling Wave ParametricAmplifier (JTWPA) based on the one-dimensional array of RF SQUIDs. Unlike theideal model in which all SQUIDs are assumed to be identical, we allowedvariation of the device parameters such as the geometric inductance of theSQUID loop, capacitance to ground, Josephson junction capacitance and criticalcurrent. Our simulations confirm the negative effects of variation of thedevice parameters leading to microwave reflections between individual cells andthe shift of the flux bias from the optimal point. The strongest effect iscaused by the variation of the geometric inductance as it varies both the waveimpedance and the flux bias. The most detrimental, however, are point defects,such as shorts to ground making the circuit opaque to microwaves. This imposesstringent requirements on the fabrication process making it extremelychallenging. We highlight the strict limitations on parameter spread in thesedevices while also discussing the robustness of the scheme to variation

The Effect of Parameter Variations on the Performance of the Josephson Travelling Wave Parametric Amplifiers