Table 2. Integrated flux of the X-ray beams (1.5 mm × 1.5 mm) generated with different undulator conditions.

Undulator period (cm)	Undulator gap (mm)	Integrated flux [photons s−1 (0.1% bandwidth)−1]	Single-pulse flux [photons s−1 (0.1% bandwidth)−1]
1.8	12	1.5 × 1016	2.3 × 109
1.8	16	3.8 × 1015	5.8 × 108
3.3	20	4.0 × 1016	6.1 × 109
3.3	30	1.0 × 1016	1.5 × 109