Today we made some Near-Field magnetic injection, using a squarewave-like generator at 55.5Hz connected to a Coil.
We did this work near many ITF location (e.g. NI tower, DET tower and electronics, INJ tower ...); the results are only qualitative, we see a non negligible effect but we can't have a projection.

We will try to repeat this kind of injection as soon as possible having also some local magnetometers are reference.

Attached the LSC_DARM FFT of quiet time (purple) and "noisy" time (blue), and also a spectrogram were time of most important injections is well visible.

Last test was made near INJ tower, but the ITF unlocked. We repeated similar injections in the afternoon, some details will follow as comment to this entry.