As part of the ORC approval process, the walk-through is conducted with the experimental representative, but depending on the situation it may be helpful to have other experimenters present so that minor issues that arise can be addressed immediately without delaying the process. It would also be useful to have a digital camera, in the case where an experiment plans to run, cease data taking for more than 30 days, and then return to take more data. The photos are intended to provide a careful check that the apparatus is indeed unchanged – if we know that the apparatus is unchanged the process is simplified.
After the walk-through (and after any appropriate remediations are in place), there will be a sequence of electronic sign-offs before beam can be requested.