You will be given a site pass when you arrive for your visit.
It is important that you wear this at all times and that it is clearly visible. This is the pass that the main control room then use to give you access to the parts of the experimental halls you need for your experiment.
For some eligible users, as well as access, the card can also be used as payment in the restaurant. We top up the card with "money". You can then present your pass at the restaurant to pay for your meal.