Table 3. Numerically computed FWHM of the intensity distribution at selected locations along the beam path for (i) the current LCLS status, (ii) after completion of an overall upgrade of the LCLS mirrors, and (iii) for the ideal case of perfectly figured and infinitely long mirrors.
The axis corresponding to each value is shown in parentheses.
| FWHM | |||
|---|---|---|---|
| Beam location | Current | After upgrade (estimated) | Ideal |
| FEH entrance aperture (mm) | – | 1.76 (x, y) | 1.76 (x, y) |
| 1 µm focal plane (µm) | 1.05 (x), 0.94 (y) | 0.43 (x, y) | 0.34 (x, y) |
| 0.1 µm focal plane (µm) | 0.12 (x), 0.11 (y) | – | 0.04 (x, y) |