-- EstherBabetteMenz - 2025-05-01

Important Phone Numbers for ESR experiments

The following list contains some important phone numbers inside of GSI. If you are calling from outside the number is +49 (0)6159-71-xxxx.

This list does not contain any personal phone numbers for privacy reasons. During experiments the ESR on-call service can be reached via the main control room, the numbers of the experimenters can usually be found on the whiteboard in the local control room.

Other phone numbers can be found in the GSI Phonebook.

In case of emergency: Please contact emergency services (112) or the police (110) directly to save time. After you have done that call the GSI emergency number (3333), the personnel at the gate will then instruct the emergency services on arrival. They can also inform GSI first aiders and provide a defibrillator. In the event of a failure of the GSI telephone system the mobile emergency numbers are 0151 541 678 70 and 0151 541 682 61.

Destination	Phone Number	Comments
Radiation safety on-call service (pager)	12-5291-xxxx	The radiation safety shift will be paged to call you back at your extension xxxx.
main control room ("HKR")	2222	first point of contact for all machine related issues
main control room - ESR console	2245	ESR operators can often be reached here during the day
emergency number ("Werkschutz")	3333	contact in case of emergencies (e.g. accidents, fire) in addition to regular emergency services