On your arrival, please, contact within two days the INFN Director's Office or the Summer Exchange Program Secretariat from Monday to Friday (9.00-13.00/1500-17.00). These offices will communicate your arrival to the Police-headquarters, sending them your passport copy.

You don't need to request a "Residence Permit" (permesso di soggiorno).

You then have to contact the INFN administration office which will provide you a standard scheme for health insurance in case of emergency. You will also receive a start up allowance of about 500 Euro.