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The rst ECAART conference was held in Frankfurt (1989) and over almost three decades it has kept its status as a high level conference reporting latest developments in the eld of particle accelerators and their applications. The previous ECAART conferences were organized in Florence (2007), Athens (2010) and Namur (2013), and in 2016 ECAART is the rst time organized in Scandinavia. The Accelerator Laboratory in Jyväskylä is a national research infrastructure in the eld of nuclear and accelerator based physics with two cyclotrons, a 1.7 MV Pelletron and a 20 MeV electron LINAC. The research covers many of the ECAART topics and therefore we are especially proud to have the conference site in Agora, only some hundred meters from the laboratory. Following the tradition, there are no parallel sessions in ECAART12. There will be all together 13 invited talks, 29 contributed talks, and more than 110 poster presentations. The posters are divided into Tuesday and Thursday sessions and they are visible also the day before the session. There is one special session on Tuesday morning celebrating 40 years of elastic recoil detection analysis (ERDA) and we are proud to have professor Jacques L'Écuyer, the rst author of 1976 ERDA paper as an invited speaker in this session. On Wednesday before the lunch and outing there is a special discussion session about the current status of the ion beam technology roadmap, an initiative by the IAEA. Excellent science is an important part of a scienti c meeting but equally important it is to meet old friends and make new ones. We are convinced that Jyväskylä, a lively city with one of the biggest universities in Finland in the middle of the Finnish Lake District will promote all of this. During the social program also the clean nature, short midsummer nights and, of course, Finnish sauna will become familiar to the conference participants. We will do our utmost to make sure that you will feel at home and together we will make this conference a productive and engaging one.

The National Electrostatics Corporation has built and tested a prototype low energy, open-air, single stage carbon accelerator mass spectrometry (AMS) system (patent pending). The configuration tested has a standard 40-sample, multi-cathode SNICS source on a 300-kV deck. The beam is mass analyzed before acceleration to a gas stripper located at ground. The 14C+ ions are separated from 13C+ and 12C+ arising from the molecular breakup by a 90° analyzing magnet immediately after the gas stripper which acts as a molecular dissociator. The 14C+ beam passes through an electrostatic spherical analyzer before entering the particle detector. The observed 14C/12C precision is better than 5% with a sensitivity of better than 0.05 dpm/gmC. A first single stage AMS system has been ordered. The configuration of this system will be discussed.

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