jeudi 3 mars 2016

CERN - Congratulations to SuperKEKB for “first turns"

CERN - European Organization for Nuclear Research logo.

3 Mar 2016

Congratulations to the SuperKEKB (link is external) electron-positron collider in Tsukuba, Japan. On 10 February, the collider succeeded in circulating and storing a positron beam moving close to the speed of light through more than a thousand magnets in a narrow tube around the 3-kilometre circumference of its main ring. Then, on 26 February, it succeeded in circulating and storing an electron beam around its ring of magnets in the opposite direction.

The achievement of "first turns", which means storing the beam in the ring through many revolutions, is a major milestone for any particle accelerator.

SuperKEKB, along with the Belle II detector, is a facility designed to search for New Physics beyond the Standard Model by measuring rare decays of elementary particles such as beauty quarks, charm quarks and tau leptons.

Image above: View of the SuperKEKB collision point in autumn 2015. The accelerator beam line is now covered with a concrete shield. The Belle II detector can be seen in the background. (Image: KEK).

Unlike the LHC at CERN, which is the world's highest energy machine, SuperKEKB/Belle II is designed to have the world's highest luminosity – a factor of 40 higher than the earlier KEKB machine that holds many records for accelerator performance. Thus, SuperKEKB will be the leading accelerator on the "luminosity frontier".

The Belle II detector at SuperKEKB was designed and built by an international collaboration of more than 600 physicists from 23 countries. This collaboration is working closely with SuperKEKB accelerator experts to optimize the machine performance and backgrounds.

At the same time as first turns were achieved, the BEAST in its cave at Tsukuba Hall awakened from its slumber. The BEAST II detector is a system of detectors designed to measure beam backgrounds of the SuperKEKB accelerator. The parasitic radiation produced by electromagnetic showers when the beam collides with the walls of the vacuum pipe, not only obscure the signals that we wish to observe, but can also damage the detector. Therefore, when operating the new accelerator, these beam backgrounds must be well understood.

The BEAST II detector will collect data in the unique environment produced by SuperKEKB’s first beams, thus paving the way to allow Belle II to safely roll into the beam in 2017.


CERN, the European Organization for Nuclear Research, is one of the world’s largest and most respected centres for scientific research. Its business is fundamental physics, finding out what the Universe is made of and how it works. At CERN, the world’s largest and most complex scientific instruments are used to study the basic constituents of matter — the fundamental particles. By studying what happens when these particles collide, physicists learn about the laws of Nature.

The instruments used at CERN are particle accelerators and detectors. Accelerators boost beams of particles to high energies before they are made to collide with each other or with stationary targets. Detectors observe and record the results of these collisions.

Founded in 1954, the CERN Laboratory sits astride the Franco–Swiss border near Geneva. It was one of Europe’s first joint ventures and now has 22 Member States.

Related links:


Standard Model:

Large Hadron Collider (LHC):

For more information about the European Organization for Nuclear Research (CERN), visit:

Image (mentioned), Text, Credits: CERN/ Kate Kahle.

Best regards,

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