LIGO Document G1500645-v3

Sensing and control problems in low finesse cavities, or "how (not) to hop"

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G - Presentations (eg Graphics)
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During the commissioning of aLIGO, particular challenges have arisen in the length control of two low finesse cavity systems: the ALS control of the 4km arm cavities, and the control of the signal recycling cavity in the H1 dual-recycled Michelson interferometer. Both of these systems have exhibited mode-hopping behaviour which is detrimental to their stability. I will present the results of simulations looking into the causes of mode-hopping in low finesse cavities, and discuss possible mitigation strategies for avoiding the problem in the future.
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Associated with Events:
GWADW 2015 held on 17 May 2015 in Girdwood, Alaska

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