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The new accelerator facility FAIR is under construction at GSI. Learn more.


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Test successfully passed! Magnet for FAIR beam transport meets all specifications

Photo: Mischa Weipert

Dipole magnet in the test setup.

Photo: Efremov Institut

Project team.



In the past weeks a magnet for the future facility FAIR (Facility for Antiproton and Ion Research) was successfully tested in the test setup at GSI Helmholtzzentrum für Schwerionenforschung. It is the first of approximately 365 magnets of different designs used to transport the beam to accelerators and experiments in the future FAIR facility. The magnet was manufactured by order of the FAIR GmbH by the Russian D.V.Efremov Institute of Electrophysical Apparatus following specifications and drafts provided by GSI. Until the end of 2018 the Efremov Institute will deliver 50 additional magnets of the same design.

In the tests performed in spring at the GSI test setup the magnet weighing nine tons has met all specifications. It generates a magnetic field of 1.6 Tesla and allows a deflection of the beam in an angle of 7.5 degrees. The magnet is a so-called dipole magnet. Dipoles form a homogeneous magnetic field between their poles and will be used in the future FAIR facility to deflect the beam for transport. Located between the two poles is the beam pipe the particles pass through. The beam pipe of this dipole has a special feature however: it has a v-shaped geometry to deflect particles in different directions. A vacuum is applied to the inside of the beam pipe to avoid collisions of the particles with air molecules during their flight through the pipe.

The now tested dipole will be mounted into the beam transport that directs the beam coming from the existing GSI ring accelerator to an experiment at FAIR. Until its installation it is planned to use the magnet for calibration of measurement facilities for further accelerator components.

The dipole magnet was drafted and designed by GSI. On the basis of these technical specifications, the production drawings were created and the components were manufactured by the Efremov Institute in St. Petersburg. The appendant vacuum pipe was built by the Budker Institute for Nuclear Physics in Novosibirsk, Russia, co-operating with the Efremov Institute for this order. It is the first of 51 magnets in total to be manufactured by the Efremov Institute for FAIR in the coming years. They are based on the same principle, but have different deflection angles and magnetic field strengths. The 51 magnets and vacuum chambers are a Russian in-kind contribution to FAIR.

Approximately 365 magnets of different designs are needed for the FAIR beam transport in total. With just a few exceptions the orders for the construction of these components have already been placed.

Dipole magnet in the test setup.
Project team.
The specifications of the dipole magnet are exactly measured in the test setup.
The new dipole magnet from St. Petersburg is 1.60 metres wide, 1.80 metres long and weighs nine tonnes. Persons involved in the project (from left): Juri Beliakin, Vitaly Palchik, Ron Rudolf Mändl, Frank Hagenbuck, Christina Will, Bruno Merk, Alexander Krasnov, Edgar Mahner, Andreas Krämer, Carsten Mühle, Aleksei Konstantinov.
Photo: Mischa Weipert
Photo: Efremov Institut