Detailed information concerning travel und and the univerity campus you can find here.
If you are travelling by car, take a look at this road map:
Download Motorway Map
Additional information provides this map of the parking lots:
Download Parking Area Map
If there is need for a route planner, look here: Here Maps
If you plan to travel by train, check the German Railroad connections at
DB Travel Information
Please choose "Ruhr-Universitaet Bochum" as destination.
After arriving at the Bochum central station, take subway U35 (direction "Hustadt/Querenburg"). Departure times can be found under VRR Timetables).
Get off the subway at "Ruhr-Universität"; turn right after climbing the stairs and follow the signs to "Naturwissenschaften" ("N" buildings). You will find the physics department in building NB; the Institute for Experimental Hadron Physics is located on level 2 (caution: not 02!).