LC period (mean and standard deviation) as function of QS feedback and noise level.

The mean and standard deviation of e-Rep LC period was measured for different QS strengths κ and noise levels xnoise. Period and noise are given in dimensionless quantities as defined in text. For LC far from IPB (κ = 0) the noise does not induce period fluctuations as evidenced by small change in standard deviation. For LC close to IPB (κ = 7.9) the noise causes large increase in LC period standard deviation, with fluctuations so large at xnoise = 0.689 that a transition to SS occurs. The increase in LC period with increasing κ due to IPB is apparent at all noise levels.