Table 1.

Major parameters for worldwide X-ray FEL facilities

Facility	Beam energy (GeV)	Photon energy (eV)	Repetition rate (Hz)	Pulse duration (FWHM) (fs)
FLASH	0.35–1.25	14–620	4 ×103 to 106	10–200
LCLS	2.5–16.9	280–12,800	120	5–400
SACLA	5.1–8.5	4,000–20,000	60	2–10
FERMI	1–1.5	20–310	50	30–100
PAL-XFEL	3.5–10	275–20,000	60	5–100
SwissFEL	2.1–5.8	250–1,240	100	1–20
European XFEL	8.5–17.5	240–25,000	2.7 × 104	3–150
SXFEL	1.0–1.6	124–1,000	50	30–1,000
LCLS-II (HE)	4–15	200–25,000	120/${10}^6$	1–500
SHINE	8	400–25,000	${10}^6$	3–600

Note that only a portion of their performance is listed here for indication. In addition, the pulse duration varies with the operating mode of the facility, such as low charge and two-color mode. More detailed information can be found on their websites.