The development of X-ray free-electron lasers (XFELs) has launched a new era in X-ray science by providing ultrafast coherent X-ray pulses with a peak brightness that is approximately one billion times higher than previous X-ray sources. This dramatic advance in capabilities has already had significant impact across broad areas of science including atomic, molecular, and optical science; chemistry; condensed-matter physics; matter in extreme conditions; and biology. This paper presents some representative highlights from the Linac Coherent Light Source (LCLS) and outlines the science motivation for upgrades providing ultrafast coherent X-ray pulses at high repetition rates up to 1 MHz in the soft X-ray range (LCLS-II) and in the hard X-ray range (LCLS-II-HE).
IOS Press, Inc.
6751 Tepper Drive
Clifton, VA 20124
Tel.: +1 703 830 6300
Fax: +1 703 830 2300 firstname.lastname@example.org
(Corporate matters and books only) IOS Press c/o Accucoms US, Inc.
For North America Sales and Customer Service
West Point Commons
Lansdale PA 19446
Tel.: +1 866 855 8967
Fax: +1 215 660 5042 email@example.com