Beam positioning stability analysis on large laser facilities
Key Laboratory on High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences,Shanghai 201800, China
Figures & Tables
Fig. 1. Schematic of a single laser beam in a laser-driven ICF facility without mirrors.
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Fig. 2. Schematic diagram of a mirror in spatial filter 
).
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Fig. 3. Variance of weighing factors in laser-driven ICF facilities.
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Fig. 4. SFLVWFs comparison of the SG-II facilities.
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Fig. 5. SFMVWF comparison of SG-II facilities.
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Fig. 6. SFLVWF comparison in different FPA systems.
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Fig. 7. SFMVWF comparison in different FPA systems.
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Fig. 8. Modules isolated from the other modules.
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Fig. 9. Steel trusses filled with concrete that decreased the responses around modal frequencies.
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Fig. 10. Beams bounded together preventing error accumulation.
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Table1. Optical parameters of SG-II Origin.
| Spatial filters | ${f}_{i, 2} ~(\mathrm{m} )$ | ${m}_{i} $ | ${q}_{i} $ | ${p}_{i} $ |
|---|
| ${\mathrm{SF} }_{0} $ | 1.0 | 2.000 | 0.0034 | 0.0034 | | ${\mathrm{SF} }_{1} $ | 1.9559 | 2.455 | 0.0043 | 0.0069 | | ${\mathrm{SF} }_{2} $ | 1.8600 | 3.014 | 0.0137 | 0.0169 | | ${\mathrm{SF} }_{3} $ | 4.6 | 3.433 | 0.0190 | 0.0503 | | ${\mathrm{SF} }_{4} $ | 1.752 | 1 | 0.0499 | 0.1749 | | ${\mathrm{SF} }_{5} $ | 3.95 | 1.819 | 0.0403 | 0.1749 | | ${\mathrm{SF} }_{6} $ | 3.231 | 1.430 | 0.0704 | 0.3181 | | ${\mathrm{SF} }_{7} $ | 9.856 | 2.243 | 0.0518 | 0.4549 | | ${\mathrm{SF} }_{8} $ | 14.502 | 1.470 | 0.0517 | 1.0204 | | Focusing lens | ${f}_{T} = 0. 75$ | — | ${q}_{T} = 1$ | ${p}_{T} = 1. 5$ |
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Table2. Optical parameters of SG-II Additional beam.
| Spatial filters | ${f}_{i, 2} ~(\mathrm{m} )$ | ${m}_{i} $ | ${q}_{i} $ | ${p}_{i} $ |
|---|
| ${\mathrm{SF} }_{0} $ | 1.0 | 2.000 | 0.0061 | 0.0061 | | ${\mathrm{SF} }_{1} $ | 1.9559 | 2.455 | 0.0076 | 0.0121 | | ${\mathrm{SF} }_{2} $ | 1.8600 | 3.014 | 0.0241 | 0.0297 | | ${\mathrm{SF} }_{3} $ | 2.3825 | 2.960 | 0.0556 | 0.0896 | | ${\mathrm{SF} }_{4} $ | 1.9971 | 2.000 | 0.1327 | 0.2651 | | ${\mathrm{SF} }_{5} $ | 4.0808 | 1.500 | 0.0974 | 0.5302 | | ${\mathrm{SF} }_{6} $ | 4.8643 | 2.120 | 0.1733 | 0.7953 | | ${\mathrm{SF} }_{7} $ | 5.6547 | 1.730 | 0.2579 | 1.6859 | | ${\mathrm{SF} }_{8} $ | 8.4876 | 1.080 | 0.1856 | 2.9167 | | Focusing lens | ${f}_{T} = 1. 575$ | — | ${q}_{T} = 1$ | ${p}_{T} = 3. 1500$ |
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Table3. Optical parameters of SG-II Updated.
| Spatial filters | ${f}_{i, 2} ~(\mathrm{m} )$ | ${m}_{i} $ | ${q}_{i} $ | ${p}_{i} $ |
|---|
| ${\mathrm{SF} }_{0} $ | 1.800 | 1 | 0.0400 | 0.1441 | | ${\mathrm{SF} }_{1} $ | 2.080 | 1.6 | 0.0554 | 0.1441 | | ${\mathrm{SF} }_{2} $ | 2.850 | 1.5 | 0.0607 | 0.2306 | | ${\mathrm{SF} }_{3} $ | 2.600 | 2 | 0.1330 | 0.3459 | | ${\mathrm{SF} }_{4} $ | 16.000 | 6.4584 | 0.1396 | 0.6918 | | ${\mathrm{SF} }_{5} $ | 11.117 | 0.9355 | 0.1880 | 4.4680 | | ${\mathrm{SF} }_{6} $ | 11.883 | 1.0689 | 0.1880 | 4.1800 | | ${\mathrm{SF} }_{7} $ | 11.117 | 0.9355 | 0.1880 | 4.4680 | | ${\mathrm{SF} }_{8} $ | 11.883 | 1.0689 | 0.1880 | 4.1800 | | ${\mathrm{SF} }_{9} $ | 16.000 | 1 | 0.1396 | 4.4680 | | Focusing lens | ${f}_{T} = 2. 234$ | — | ${q}_{T} = 1$ | ${p}_{T} = 4. 468$ |
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Table4. Experimental parameters in a four-pass amplification system.
| Lenses in four-pass amplification (FPA) | CSF-L1 (m) | CSF-L2 (m) | Beam aperture magnification ratio |
|---|
| Real parameters in SG-II updated | 11.883 | 11.117 | 0.9355 | | First fictional parameters | 20 | 10 | 0.5 | | Second fictional parameters | 10 | 5 | 0.5 |
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Fang Liu, Zhigang Liu, Liunian Zheng, Hongbiao Huang, Jianqiang Zhu. Beam positioning stability analysis on large laser facilities[J]. Collection Of theses on high power laser and plasma physics, 2013, 11(1): 0029.
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