This morning, during the maintenance, several ENV activities were carried out at NEB and CEB.

NEB activities
We reorganized the configuration of the accelerometers previously installed along the tower vacuum chamber for the mechanical modes measurement (#60441). Three sensors had been mounted (ENV_NE_TOP/MIDDLE/BOTTOM_ACC), with the latter two used in past investigations of the so-called “cactus” noise related to the vacuum system (#63540,63545,63647)

The top accelerometer was left untouched and remains installed. The middle accelerometer has been reinstalled, while the bottom accelerometer has been completely removed. In addtion, the cabling of the accelerometer previously installed on the safety structure (ENV_NE_SS_ACC) during the opening of the tower (cupola and virola temporarly dismounted, #60475)  has also been removed.

Another planned activity was the removal of the accelerometer installed on the SAS air supply duct. This could not be completed using only a ladder; a mobile scaffold will be required to safely remove the sensor. The same intervention will be needed at WEB as well.
In the meantime, the sensor has been removed from the data acquisition process (ENV_NE_SAS_SUP_ACC). The corresponding action at WEB had already been performed last week (#60748)

CEB activities
Some reference measurements were taken for Gilles's magnetic-coupling simulation model at CEB (coil position and distances from surrounding structures). These measurements will be used to validate the model against the coupling observed during far-field magnetic injection campaigns.