Table 1 Parameters and properties of the multiple split-and-delay line. 15 probe and reference channel pairs were realized in the geometry shown in Figure 1 for 4.5 keV photon energy and a Sn-to-sample distance of a = 12.2 m. The recombiner grating pitches qn and q'n refer to the probe and reference channels, respectively. The channel efficiencies ηn and η'n of the probe and reference channels are the products of the diffraction efficiencies of the two gratings in each channel. They represent the relative channel intensities compared to the direct pump beam intensity when no attenuators are used. Δtn denotes the resulting delay with respect to the direct pump beam, δtn is the chromatic delay uncertainty calculated for a 0.2% relative energy bandwidth.
From: Following the dynamics of matter with femtosecond precision using the X-ray streaking method
Channel number n | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Grating period qn [nm] | 141.364 | 93.869 | 70.682 | 56.196 | 46.942 | 39.843 | 34.908 | 31.295 | 28.103 | 25.467 | 23.250 | 21.528 | 19.952 | 18.573 | 17.391 |
Grating period q'n [nm] | 142.564 | 94.396 | 70.981 | 56.384 | 47.074 | 39.938 | 34.981 | 31.353 | 28.150 | 25.505 | 23.282 | 21.556 | 19.976 | 18.593 | 17.409 |
Deflection Δxn [mm] | 6 | 9 | 12 | 15 | 18 | 21 | 24 | 27 | 30 | 33 | 36 | 39 | 42 | 45 | 48 |
Channel efficiency ηn | 4.4E-4 | 2.0E-4 | 3.0E-5 | 2.4E-4 | 1.4E-5 | 9.8E-6 | 1.4E-5 | 1.8E-6 | 6.4E-6 | 6.4E-6 | 3.9E-6 | 6E-7 | 4E-7 | <1E-7 | <1E-7 |
Channel efficiency η'n | 4.4E-4 | 1.6E-4 | 3.1E-5 | 2.4E-4 | 1.6E-5 | 1.1E-5 | 1.4E-5 | 1.9E-6 | 6.2E-6 | 2.5E-7 | 3.7E-6 | <1E-7 | 1E-7 | <1E-7 | <1E-7 |
Delay Δt n [fs] | 19 | 44 | 77 | 122 | 175 | 243 | 317 | 394 | 489 | 595 | 714 | 833 | 970 | 1120 | 1277 |
Delay uncertainty δt n [fs] | 0.08 | 0.18 | 0.31 | 0.49 | 0.70 | 0.97 | 1.3 | 1.6 | 2.0 | 2.4 | 2.9 | 3.3 | 3.9 | 4.5 | 5.1 |
