International competition for high school students from all around the world organised by CERN, the European Organization for Nuclear Research, in Geneva, Switzerland

The competition invites teams of high-school students to propose a scientific experiment that they want to perform at a particle accelerator. The two teams that prepare the best proposals will win a trip to a particle accelerator facility to perform their experiments at a fully-equipped beamline. Because of the maintenance of CERN's accelerators since the end of 2018, the winning experiments in 2021 will run at DESY in Hamburg, Germany. There are additional prizes for a shortlist of teams and certificates for all participants. Learn more about BL4S and how to apply and get inspired by our latest promotional video:


How to take part in BL4S 2021?

The proposal submission is open

Take part in hands-on scientific experiments on-site at a particle accelerator! Through BL4S, CERN and DESY offer a great opportunity for students to learn, make new discoveries and apply their knowledge into new settings. Get inspired by our videos and previous winners, join our BL4S Facebook group and stay tuned for news!

If you need more information, get in touch us at:


Edition 2020

Altogether 198 teams from 47 countries submitted a proposal.

In 2020 the two winning teams have been invited to DESY and CERN in autumn.


Would you like to see our previous editions? To discover  about the previous winners click  here.

In the picture above: Winner team of BL4S 2020 at CERN.


The proposal submission to BL4S 2021 is open. Subscribe to our BL4S newsletter to get more news!

In the picture above: Winner team of BL4S 2020 at DESY.


We are grateful to all our sponsors and supporters whose contributions help us make possible the Beamline for Schools Competition. 

To support the Beamline for Schools project, as well as other CERN projects that have an impact on society, donate through the CERN & Society website.