IMATI is located in the "Nave-Polo Cravino" campus of the University of Pavia, here is the location on Google Maps.
From the railway station, you can reach IMATI either on foot (it takes about 20 minutes) or by bus. You can either take bus 3 and get off at the Ferrata/Tangenziale Ovest stop or take bus 7 and get off at the Cascinazza/Ferrata stop.Useful links:
The closest airport to Pavia is the Milan Linate airport. From there you can take a direct bus to Pavia, see the schedule. Another possibility is to take the bus to Milan Central Station (Milano Centrale), and then a train to Pavia.
If you fly to Milan Malpensa, we recommend taking a train to Milano Bovisa. Trains from Milano Bovisa to Pavia are running every 30 minutes.
If you fly to Orio Al Serio (Bergamo), you can take a bus to Milan Central Station (Milano Centrale), and from there a train to Pavia.
On this webpage you can check the schedules of trains running to Pavia.