The BER II neutron source is back in operation and available for experiments following the interruption in availability
The High-Field Magnet (HFM) has attained 26 tesla in an initial test and thereby exceeded expectations. The HFM team is pleased about the well-deserved success.
© HZB/Ingo Kniest
Maintenance work has been successfully concluded – the High-Field Magnet has successfully attained 26 tesla in initial testing. New scientific experiments have become possible.
Berlin, February 2015: following conclusion of more than a of year of repairs and refurbishing, the BER II neutron source will shortly be available to its international user group again. The facility was powered up on Wednesday, February 18 and attained its nominal power level of 9,5 megawatts. Scientists of HZB are meanwhile preparing the measurement equipment so that experimental work can resume following a brief start-up period.
During the service interruption, a weld joint was eliminated that was known to be a potential weak point. This involved a weld joint for a seal located in the area of the separator between the two reactor pool halves. Damage to this weld joint was discovered in 2010 and has been carefully monitored since that time. This did not involve a component critical to safety; nevertheless, it was decided in 2013 to completely remove the weld joint.
At the same time, the new High-Field Magnet went through final assembly and was setup in its final operating position inside in the Neutron Guide Hall. Its 26-tesla magnetic field was first generated in December 2014 and it maintained this value stably over a longer period of time. So it even exceeded its target value of 25 tesla.
Following the maintenance period, an important objective was reached with the successful resumption in BER II operations: participants of the international Neutron School can again be offered actual neutron experiments of the customary high quality. The 12-day advanced course for young scientists will be taking place in Berlin for the 35th time, from February 26th to March 6th.
Developing and successfully setting up the High-Field Magnet, unique for neutron experiments, has only taken 7.5 years. All of the comparable hybrid magnet construction projects worldwide during the past 25 years have taken between 9.5 and 16 years. The brief project length can therefore be viewed as top of its class. In addition, the project remained within its planned budget of just under 21 mil. EUR after adjusting for inflation.
The High-Field Magnet represents yet another first-class instrument that is being connected to the neutron source for the final BER II support period. Completely new kinds of experiments become possible that will open up access to new science, such as researching superconduction and magnetic phase transitions in solid-state materials, for example.
- HZB patent for semiconductor characterisation goes into serial productionAn HZB team has developed an innovative monochromator that is now being produced and marketed by a company. The device makes it possible to quickly and continuously measure the optoelectronic properties of semiconductor materials with high precision over a broad spectral range from the near infrared to the deep ultraviolet. Stray light is efficiently suppressed. This innovation is of interest for the development of new materials and can also be used to better control industrial processes.
- Alternating currents for alternative computing with magnetsA new study conducted at the University of Vienna, the Max Planck Institute for Intelligent Systems in Stuttgart, and the Helmholtz Centers in Berlin and Dresden takes an important step in the challenge to miniaturize computing devices and to make them more energy-efficient. The work published in the renowned scientific journal Science Advances opens up new possibilities for creating reprogrammable magnonic circuits by exciting spin waves by alternating currents and redirecting these waves on demand. The experiments were carried out at the Maxymus beamline at BESSY II.
- Green hydrogen: MXenes shows talent as catalyst for oxygen evolutionThe MXene class of materials has many talents. An international team led by HZB chemist Michelle Browne has now demonstrated that MXenes, properly functionalised, are excellent catalysts for the oxygen evolution reaction in electrolytic water splitting. They are more stable and efficient than the best metal oxide catalysts currently available. The team is now extensively characterising these MXene catalysts for water splitting at the Berlin X-ray source BESSY II and Soleil Synchrotron in France.