¶ Length Sensing and Control
The LSC and ASC systems actively control the length and alignment of the optical cavities in relation to the "on resonance" condition. The LSC and ASC differ in that data for the servos is collected in both the end stations and the vertex. The LSC, like the ASC, is a highly distributed multi-input multi-output (MIMO) servo control system.
All sampling and servo calculations for the LSC are performed at 16,384Hz, the maximum sample rate for LIGO. This sample rate is necessary because many of the LSC servos have unity gain bandwidths greater than 100Hz. In addition, data collected and processed by a CPU located in the vertex area may be used to drive an optic located in one of the end stations.
¶ Channel Name Breakdown:
| Name | Description |
|---|---|
| Channels | |
| LSC | Length Sensing and Control |