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Scientific Applications Using High Repetition Rate Hard X-Ray FELs  
  • T. Tschentscher
    EuXFEL, Hamburg, Germany
  Hard X-ray free-electron lasers (FEL) present one of the most challenging applications of electron accelerators. European XFEL is one of these installations providing up to ~30.000 bunches per second, more than a factor 100 higher than other facilities. High repetition rate FEL experiments allow to open new science opportunities and thus drive the accelerator development. These facilities rely on SRF technology to enable high repetition rates, either by using pulsed RF (FLASH, European XFEL) or so-called continuous-wave (cw) RF (LCLS-II, SHINE). European XFEL has started user operation in 2017 after 8 yrs of construction. The facility is designed to serve several science instruments quasi-simultanously using its delivery of up to ~30.000 bunches per second using a 10 Hz burst pattern. These bunches can be distributed to presently 3 (future 5) FEL sources serving 6 to 10 science instruments. The talk will cover the scientific motivation for hard X-ray high repetition rate FELs, introduce the current facility status, and highlight results from first experiments using high repetition rate X-ray delivery. Differences between pulsed and cw beam delivery will be discussed.  
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Pros and Cons of Laser-Plasma Accelerators: Where Are the Limits, and Will LPA Compete With SRF  
  • A.R. Maier
    University of Hamburg, Hamburg, Germany
  There is a lot of excitement about ultra-compact laser plasma accelerators (LPA), and they are being praised as the enabling technology for next-generation accelerators and light-sources. However many questions remain among "non-experts" outside the field: What performance can realistically be expected? Will LPA-based facilities be indeed as compact and relatively inexpensive as is being advertised? Are reliable user facilities feasible in the next couple of decades and is it realistic that such facilities will someday be able to replace conventional and SRF-based accelerators? Or will laser-plasma acceleration be a complementary technology, with each of the three systems serving a different category of users? Openly discussing the fundamental concepts, limitations and opportunities of laser-plasma acceleration, this contribution will try to provide an answer to at least some of these questions. Finally, reviewing the current state-of-the-art and challenges of the field, an outlook on the development in the next few years will be presented.  
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