The SPEC (building 772) is located inside the L'Orme des Merisiers campus of the CEA Saclay research center. (NOTE that L'Orme des merisiers is outside the main CEA center (see picture)
The CEA-Saclay research is located on the Saclay plateau, approximatively 20 km in the South-West of Paris.
From Paris or from the airports CDG and Orly, take the B-line of the RER train, direction Saint-Rémy-les-Chevreuse to either Massy-Palaiseau or Le Guichet (approximately, 25 and 35 minutes ride from Paris, and 1h05 and 1h15 from the CDG airport, respectively). Local bus and the CEA shuttle bus services are available from these stations. Note: From Orly airport, take first the Orlyval to Antony station.
To optimize your trip to SPEC, please consult the website of the local public transports. For "Arrival point", select "Arrêt, gare" and then fill in the fields with "Orme des Merisiers", commune "Saint-Aubin".
Once you exit the train, cross the footbridge located near the rear of the train. At the bottom of the stairs, continue for 30 meters until you reach the bus stop 91-06. The bus fare is included in the weekly or monthly pass "Navigo zones 4-5" as well as in the RATP (metro) tickets to and from Paris; otherwise, tickets can be purchased on the bus. SPEC is located across from the bus stop “Orme des Merisiers” (appx. 20 minutes from Massy-Palaiseau). The bus schedule can be found on the website of the greater Paris area public transportation (Enter Departure point = Gare de Massy Palaiseau and the arrival point: Orme des Merisiers)
From the platform take the pedestrian underpass at the front of the train, turn right after the cafe and cross the street. Follow the sign marked "Parc de Stationnement de Corbeville" to reach the bus terminal. Take the bus 269-02. The bus fare is included in the weekly or monthly pass "Navigo zone 5" as well as in RATP (metro) tickets to and from Paris (must be written ‘BUS’ on the ticket) otherwise, tickets can be purchased on the bus. SPEC is located across from the bus stop “Orme des Merisiers” (approx. 15 minutes). Please be advised that the 269-02 service becomes very sparse after 10 AM (10:10, 11:12, 11:45). The bus schedule can be found on the website of the greater Paris region public transportation (Enter Departure point = Le Guichet, town: Orsay and Arrival point: Orme des Merisiers).
The CEA shuttle stop is located across the street from the bus terminal as described above. The shuttle service is scheduled at 7h55, 8h25, 8h50, 9h00, 9h25, 9h40 and 12h55. WARNING : Ask the driver to make a stop at the Orme des Merisiers. Otherwise, the bus will continue directly the main CEA campus.
The main entrance of the Orme des Merisiers in located on the D128 road, at 400m of the Saint-Aubin roundabout between the N306 and D128 roads.
Once you have entered the Orme des merisiers, go straight for approximately 8 minutes and turn on your right when you can ; the SPEC is the only building 772/774. Inside the building, the SPEC is on your right.