对波荡器位相误差对自由电子激光小信号增益的影响进行了分析讨论。

The effects of undulator phase errors on the Free Electron Laser small signal gain is analyzed and discussed.

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该非线性PID算法构造了增益参数关于误差信号的非线性拟合函数，算法能够同时保证响应速度快、超调量小以及自适应能力强的系统特性。

The nonlinear function is given by the nonlinear PID algorithm, and the algorithm can guarantee the system have the property of the fast response, a little over shot and strong self adaptive.

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该方法应用改进冗余位结构，通过在其子dac输出端引入伪随机信号测量级间增益，并利用此估计值在后台进行增益误差补偿。

Using a reformative redundant stage, gain errors are measured by PR (pseudo-random) signal being injected at sub-DAC output and compensated in background according to the estimated value.

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