CERN Accelerating science

  A step towards Next Generation Magnets
  by Luca Bottura (CERN)


A Roebel cable prototype, inserted in a sample holder and ready for test at low temperature and high field in the CERN FRESCA test facility. Image credit: J. Fleiter, CERN

The Future Magnets, Work Package 10 of EuCARD-2 is exploring the use of High Temperature Superconductors (HTS) materials in future accelerator magnets: YBCO and BSCCO. Both YBCO and BSCCO were found to have not only a high critical temperature, but also a very high critical field, exceeding 100 T. This is what makes them especially interesting for high field accelerator magnet applications.

Following an evaluation performed by the EuCARD2 WP10 team, and the associated laboratories in the US and Japan, it was decided that the European program would focus on YBCO tapes, assembled in Roebel bars or, as an option, stacked tapes. YBCO is a material produced by one of the industrial partners of EuCARD-2 (Bruker HTS), and has potential for use both in very high field applications beyond the scope of WP10, such as Nuclear Magnetic Resonance magnets, as well as power applications such as Fault Current Limiters or high current power transmission cables. Accelerator magnets require high current, and the Roebel bar is a way devised by KIT to assemble multiple YBCO tapes in a high current transposed conductor. Samples of such conductors were already tested at CERN at cryogenic conditions (4.2 K) and intense field (10 T), showing the desired high current carrying capability. The EuCARD2 WP10 will produce samples of YBCO Roebel bars in the coming months.

As for the alternate material, EuCARD2 makes a significant contribution by providing the precursor powders necessary for the production of the BSCCO-2212 superconducting wire.

The question for the coil cross section is yet open for both Roebel bars and Rutherford cables; the magnet geometry for making the optimal use of the current carrying capacity of the superconductor, and respecting the engineering limits of the materials, is not necessarily the same.

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  New video introducing EuCARD-2
  by Agnes Szeberenyi (CERN)


Maurizio Vretenar presents the EuCARD-2 project. Image credit: EuCARD-2, CERN

Watch the recently launched video that gives a short introduction to the EuCARD-2 project and its mission to develop particle accelerators of the 21st century.

The project gives the opportunity for a new generation of scientists to be trained in an advanced technological and international environment. "We want to develop a new generation of accelerators that allow not only scientists to profit, but also society – in medicine and industry," says project coordinator Maurizio Vretenar of CERN.

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  EuCARD wrap-up and beyond
  by Agnes Szeberenyi (CERN) and Livia Lapadatescu (CERN)


Some key project figures. Image credit: EuCARD.

The EuCARD project was launched to join forces to improve the performance of European accelerator infrastructures. After 4 years of running, the project lived up to the expectations and achieved most of its ambitious goals. The work in EuCARD has been organized around scientific networks, transnational activities and joint research activities.

The Accelerating News newsletter, the series of scientific monographs on accelerator sciences and the roadmaps towards novel frontier accelerators are just a few examples of the outcomes of networking activities under the umbrella of the project. During the lifetime of the project, an out-of-contract networking activity has been successfully launched on laser plasma acceleration, contributing and supporting the AWAKE collaboration, which has gained relevant momentum since then. Two test facilities were open in EuCARD to transnational access: HiRadMat@SPS and MICE@STFC. The EC funding of these TA was mostly dedicated to the support of the new users’ visits and research in the facilities.

The joint research activities had the lion’s share in EuCARD. The highlights of these activities include: development of an innovative Nb3Sn magnet with a high-temperature superconducting YBCO insert for the first time in Europe; a smart collimator and cryocatcher, two-beam acceleration RF technologies, the active mechanical stabilization of magnets to a fraction of nanometer, ultra-precise beam monitoring, 20 fs scale synchronization and novel high gradient RF cavities for proton linacs, etc.

As EuCARD finished on 31st July, EuCARD-2 will build upon the success of EuCARD and push it into an even more innovative regime.

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  Towards energy efficient particle accelerators
  by Mike Seidel (PSI) with Mathilde Chaudron (CERN)


Inductive Output Tube (IOT). Image credit: CPI.

The 2nd Workshop on Energy for Sustainable Science at Research Infrastructures was held the 23-25 October 2013 at CERN to discuss the challenges and potential solutions in energy efficiency. The workshop featured a talk from the EnEfficient network, the EuCARD-2 Work Package 3, which presented its plan to stimulate innovation in the energy efficiency of particle accelerators in the coming years.

Scarcity of resources, along with rising energy costs and climate change are ever growing concerns for the next generation of large accelerator based facilities. Indeed, the much increased performance of proposed new facilities comes together with anticipated increased power consumption. The network EnEfficient builds on this recent consciousness that accelerators have to be sustainable over the long term and socially acceptable by reducing their environmental impact and their energy consumption. It aims to federate the initiatives of research institutions and universities towards an efficient utilization of electrical power in 5 different areas: heat recovery, efficiency of Radio Frequency (RF) power generation, virtual power plant (improved adaptation to varying supply situation on grid), energy storage systems and low power beam transport channels.

As one of the networking activities a workshop on efficient RF generation will be organized in the spring of 2014. The picture shows the concept design of a multi-beam Inductive Output Tube (IOT). IOTs typically reach higher efficiency than traditional klystrons particularly where klystrons need to be operated below saturation. The utilization of this technology for the accelerator of the European Spallation Source (ESS) is presently being investigated which would result in electrical power savings of 3 MW. European

Additional participants are sought and are welcome in all themes of the EnEfficient network.

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