Abstract
Commissioning of two large coherent light facilities (XFELs) at SLAC and DESY should begin in 2008 and 2011, respectively. In this paper we look further into the future, hoping to answer, in a very preliminary way, two questions. First: What will the next generation of XFEL facilities look like? Believing that superconducting technology offers advantages such as high quality beams with highly populated bunches, the possibility of energy recovery and higher overall efficiency than warm technology, we focus this preliminary study on the superconducting option. From this belief the second question arises: What modifications in superconducting technology and in the machine design are needed, as compared to the present DESY XFEL, and what kind of research and development program should be proposed to arrive in the next few years at a technically feasible solution with even higher brilliance and increased overall conversion of ac power to photon beam power? In this paper we will very often refer to and profit from the DESY XFEL design, acknowledging its many technically innovative solutions.
Highlights
Two high brilliance pulsed large coherent light facilities (XFELs) have been proposed: one at SLAC [1] and another one at DESY [2]
First: What will the generation of XFEL facilities look like? Believing that superconducting technology offers advantages such as high quality beams with highly populated bunches, the possibility of energy recovery and higher overall efficiency than warm technology, we focus this preliminary study on the superconducting option
The DESY XFEL will provide average brilliance of 1:6 1025 as a result of different driving linac technologies used in each project
Summary
Two high brilliance pulsed large coherent light facilities (XFELs) have been proposed: one at SLAC [1] and another one at DESY [2] (by the European collaboration). The difference in the average brilliance mostly results from the number of bunches per second, which is 120 in the LCLS design and 40 000 in the DESY XFEL design. Recent experimental results of GeV scale energy recovery in the superconducting CEBAF accelerator at the Thomas Jefferson National Accelerator Facility (JLab) [3] are quite encouraging. We explore the feasibility of continuous wave (cw) or semi-cw (single long rf pulse per second) operational mode for a future XFEL facility. One recognizes that this mode will significantly increase the average brilliance of the XFEL. The only remedy known to us is to operate in the energy recovery (ER) mode
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