Helmholtz-Zentrum Berlin-Adlershof, Wilhelm-Conrad-Röntgen-Campus, is located in the neighbourhood "Adlershof":
https://www.helmholtz-berlin.de/zentrum/locations/standort/index_de.html#c475820
https://www.helmholtz-berlin.de/zentrum/locations/standort/wegbeschreibung-ah/index_de.html
https://www.helmholtz-berlin.de/zentrum/locations/standort/wegbeschreibung-ah/index_en.html
Airport Tegel is about 90 min´s by public transport. Jump on a bus there, X109 or TXL, which brings you to the next S-Bahn station on the "Ring", and change there to a Ring-S-Bahn in clockwise direction, until "Ostkreuz". At Ostkreuz, or "Treptower Park" at the latest, it´s necessary to leave the Ring. Change to a S-Bahn direction "Zeuthen", "Grünau" or "Schönefeld" and get off at "Adlershof". From there you can get on the bus 164 or Tram 61/63 until "Magnusstraße". Or you walk. Tickets are always AB. Don´t forget to validate them before the trip. Use the little machines until you hear the "pling"-noise. Ticket control is frequent and mercyless.
Airport Schönefeld is closer. In front of the terminal B the convenient direct bus line 164 direction "S-Bahn Köpenick" departs and stops at "Magnusstraße". It´s approximately 20 min´s to BESSY. Tickets are ABC, available at the driver.
If you come to Berlin by train to "Südkreuz" or "Hauptbahnhof", please use the public transport to Adlershof and Magnusstraße: http://www.bvg.de/en
Tickets from there are AB.
Always remember Tony Wheeler, the inventor of the "Lonely Planet" travel guides: "Getting there is half the fun."
