Milestone on way to switching on world's largest superconducting linear accelerator

April 19, 2017, Deutsches Elektronen-Synchrotron
A view into the 2.1-kilometre long accelerator tunnel of European XFEL with the yellow superconducting accelerator modules hanging from the ceiling Credit: photo: DESY/D. Noelle

The international X-ray laser European XFEL has reached one of its final major milestones on the way to scientific user operation. DESY has successfully commissioned the particle accelerator, which drives the X-ray laser along its full length.

Accelerated electrons have passed through the complete 2.1 kilometre length of the accelerator tunnel. In the next step, the energy of the electrons will be raised further, before they will be sent into a magnetic slalom section where the bright X-ray light will be generated. This first lasing is planned for May. DESY is the largest shareholder of the European XFEL and is responsible for the construction and operation of the superconducting .

"The European XFEL's is the first superconducting linear accelerator of this size in the world to go into operation. With the commissioning of this complex machine, DESY and European XFEL scientists have placed the crown on their 20-year engagement in developing and building this large international project. The first experiments are within reach, and I am quite excited about the discoveries ahead of us", says Chairman of the DESY Board of Directors Helmut Dosch. "I am exceptionally happy about arriving at this milestone and congratulate all involved for the outstanding work and their great tenacity."

Chairman of the European XFEL Management Board Robert Feidenhans'l says: "The successful commissioning of the accelerator is a very important step that brings us much closer to the start of user operation in the fall. Under the leadership of DESY, the Accelerator Consortium, comprising 17 research institutes, has done an excellent job in the last years. I thank all colleagues involved for their work, which entailed a great deal of know-how and precision but also much personal commitment. The accelerator is an outstanding example of successful global cooperation, encompassing research facilities, institutes, and universities alongside companies that produced certain components."

The European XFEL is an X-ray laser of superlatives: The research facility will produce up to 27 000 X-ray laser flashes per second, each so short and intense that researchers can make pictures of structures and processes at the atomic level.

The superconducting particle accelerator of the facility, which is now operational across its full length, is the key component of the 3.4 km long X-ray laser. The accelerator's superconducting TESLA technology, which was developed in an international collaboration led by DESY, is the basis for the unique high rate of X-ray laser flashes. Superconductivity means that the accelerator components have no electrical resistance. For this, they have to be cooled to extremely low temperatures.

From December into January, the accelerator was cooled to its operating temperature of -271°C. The so-called electron injector and first section of the main accelerator then went into operation, comprising altogether 18 of 98 total accelerator modules. Within this section, the electron bunches were both accelerated and compressed three times, down to 10 micrometres (a thousandth of a millimetre). Finally, the team placed the third section of the accelerator into operation. Currently, the electrons reach an energy of 12 gigaelectronvolts (GeV), and in regular operation, an energy of up to 17.5 GeV is planned.

"The energy and other properties of the electron bunches are already within the range where they will be during first user operation", says DESY physicist Winfried Decking, who leads the commissioning of the European XFEL accelerator.

The coordination of the unique components of the accelerator and the control of the electron beam will now be intensively tested before the accelerated electrons are allowed into the following section: the up to 210 m long special magnetic structures called undulators. There, the ultrabright X-ray laser flashes will be generated. Scientific experiments should begin this fall.

The superconducting particle of the European XFEL was built over the last seven years through an international consortium, under the leadership of DESY, composed of the following research institutes: CEA and CNRS in France; INFN in Italy; IFJ-PAN, NCBJ, and the Wroc?aw University of Technology in Poland; the Budker Institute, Institute for High Energy Physics, Institute for Nuclear Research, and NIIEFA in Russia; CIEMAT and Universidad Politécnica de Madrid in Spain; the Manne Siegbahn Laboratory, Stockholm University, and Uppsala University in Sweden; and the Paul Scherrer Institute in Switzerland.

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not rated yet Apr 19, 2017
The DESY accelerator may be super-conducting, but the SLAC at Stanford is more powerful, it accelerates electrons to 25 GeV. Isn't energy what it's all about? Are they not doing the same kind of experiments?
not rated yet Apr 20, 2017
@baudrunner No, they are not doing the same kind of experiments. SLAC is only a particle accelerator, used for sub-atomic particle research and such. This XFEL accelerator is part of a Free Electron Laser that will be used to generate x-rays (hence the name, XFEL). The accelerator shoots electrons at relativistic velocities into a chamber of alternating magnetic fields, resulting in the generation of coherent x-ray light.

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