These days, I am working again at the Neutrino Platform at the Prevessin Site. I am preparing a PIN diode box with LED illumination for a cold test which was shipped from my colleagues at Hawai’i.
This is the camera assembly that I quickly designed for the cryo-test. The off-the-shelf webcam is mounted inside an acrylic dome which is kept warm by a constant supply of warm GAr. A rotary feedthrough allows to look around during operation. It provides us with a view of the inside of the cryostat which is important to benchmark the evaporation performance of the heat exchanger assembly.
These days I have some cable installation work at ProtoDUNE-SP on the agenda. The picture was taken inside the cryostat. This is a very impressive facility!
We are preparing the next benchmarking test of the DS-20k cryogenic setup. This includes the modification of a valve on the nitrogen vent that controls the cooling power based on the cryostat pressure – a fully mechanical and failsafe emergency cooling loop. The opening pressure can now be set by adjusting the counteracting spring force.
