On 20/11/2018:

After the electronics tests in air (see eLog entry #44) we started to setup the chamber for vacuum tests with an alpha source.

We started mounting the aperture used for controlling the near iris arm, however we encountered a problem. The iris arm got stuck and could not move in either direction (into or out of the chamber)

We dismounted both preamps. After bending the near iris arm's hook we managed to dismount the chambers central lid.

Before doing anything else, we dismounted the near S2 and 12um mylar foil.

A new iris arm for the near iris needs to be manufactured by the workshop in CIRCE. The workshop was closed for the end of the day, so we also stopped for the day.