This morning we setup some monitors and injection tools which can allow some noise hunting from remote (if possible). In particular we:

• placed two magnetic probes inside SQZ racks (detection EE room), names are: ENV_DER_MAG_1, ENV_DER_MAG_2 (I let Federico adding the pictures he took)
• installed the small shaker (the big one resulted damaged after the last injections) clamped at the feet of DT cryotrap, it is connected to DAC channel in TCSroom (pictures attached); we tested a few low frequency injections with lines and colored noise (Figures 3, 4 and 5) which managed to exceed by x10 accelerometers arounnd the CT (Figures 3, 4, 5).
• installed the louspeaker setup (thanks to Riccardo Romboli) in the CEB North terrace connecting it to DAC channel n.7 in DETterrace. Even in standby state the loudspekers were emitting some noisy sound probably a mains pick up due to uneven electrical ground between the DAC and the speakers power supply. Thus, we left the speakers unplugged.We tested the injection of pair of lines 181 and 181.2Hz, Figures 6, 7.
• The ACL of tested levels are reported in the attached log.file.