Be careful, the IRAMIS institute has two main sites:
-The IRAMIS divisions of SPAM, SPCSI, SIS2M, LLB are located inside the center of CEA-Saclay. (enter by the North Door 'porte nord')
- The IRAMIS divisions of SPEC are at l’Orme des Merisiers, also on the plateau but at a 3 km distance from the CEA center entrance.
and other divisions of IRAMIS are not at Saclay:
RATP : http://www.ratp.fr/
SNCF : http://www.sncf.com/
From the airport Roissy, take the RER Line B which connects Paris with the area of Saclay and Orsay located at South.
The station is Massy-Palaiseau.
Travel will take around 1 hour.
From the airport Orly, go to the station “Antony” of line RERB by taking the line “Orlyval” (cf www.ratp.fr) and there, take the RER Line B. direction which connects Paris with the area of Saclay and Orsay located at South.
At Massy-Palaiseau, now you can take the Bus ALBATRANS 91-06 . The Bus station is "CEA-SACLAY Porte Nord". The travel take only 15 minutes.
If you go to l’Orme (SPEC), the RER Station is "Le
Guichet" get off at the stop "Orme les Merisiers". Bus
ticket price is the one of metro subway ticket.
Once at “Orme des Merisiers” go to the building 703 (see below the map of Orme site).
If you travel by car to go to “L’Orme”:
From the cross road “Christ de Saclay”, follow the N306 road, direction
is St-Aubin, Gif/Yvette,
This N306 road is along the CEA center, after 300 m you will arrive to a first traffic circle cross road (which connects to the INSTN gate of CEA-Saclay) ; you go on straight away on the N305, and after driving 500m there is a second traffic circle cross road, you turn to the left (rotate by 270 degrees from your incoming direction ; in other words, you will exit on the road corresponding to the fourth exit of the traffic circle (first one goes to St-Aubin, second one to Gif-sur-Yvette, 3rd to SOLEIL facility ). The 4th one is the D128 road, go slowly, and just after 10m you will find the entrance gate of Orme des Merisiers.