I added another L4C under HAM1 for the feedforward test I've been running there. We were locking, so I was trying to minimize the time under the chamber and didn't get a picture in situ, but the attached picture shows the cradle that Tyler 3d-printed for me. This is tucked next to the -x/-y, southeast pier of HAM1. I will probably try to put a cover over this next week, but for now it's just sitting under the chamber, aligned roughly along the IFO X arm. I haven't had a chance to add calibration filters or add alignment values to the HAM1 model, so the only channel for the data so far is the input 3DL4CINF_B_X_IN1_DQ channel.

Second image is some data from DTT looking at asds on top, with calibrated HEPI L4C X and HAM2 STS X. No calibration on the 3DL4C, the fact that the microseism isn't visible makes be think the 3d printed isn't stable enough. LLO says they may have some nicer purpose built metal clamps. Coherence is on the bottom, it's kind of low above 10 hz, it would probably help to have another X sensor.

The l4c serial number is L41501.