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Laser beam intensity profiles in VISRAD are modeled using an analytic (supergaussian) spatial profile. Parameters used in computing spatial profiles for OMEGA, NIF, and LMJ phase plates are given below .
Distributed Phase Plates (DPPs) for OMEGA
The table below summarizes spatial profile parameters for OMEGA phase plates currently supported by VISRAD.
OMEGA DPP Type 1/e R-major (mm) 1/e R-minor (mm) Supergaussian n SSD/DPR SG5-650 circular 287 - 5.11 On SG5 circular 357 - 4.77 On SG8 circular 438 - 4.5 On SG8-Flat circular 438 - 5.8 On PD-SG2-600 circular 300 - 2.2 On E-IDI-300 elliptical 144 106 4.3 Off E-SG4-865 elliptical 430 396 4.7 On E-SG10-300 elliptical 171 157 2.5 On 100 um (s/n 083) circular 100 - 2.0 On 100 um (s/n 086) circular 99 - 2.2 On 200 um (s/n 120) circular 107 - 2.0 On 200 um (s/n 018) circular 105 - 2.1 On 500 um (s/n 006) circular 150 - 1.9 On 500 um (s/n 026) circular 149 - 1.9 On 700 um (s/n 056) circular 195 - 1.9 On 700 um (s/n 058) circular 202 - 1.8 On LLNL-3w-150-328 circular 75 - 2 On LLNL-3w-250-024 circular 125 - 2 On LLNL-3w-250-027 circular 125 - 2 On
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# Radii at 5% of Imax .
The table below summarizes spatial profile parameters for OMEGA-EP phase plates currently supported by VISRAD.
OMEGA DPP Type 1/e R-major (mm) 1/e R-minor (mm) Supergaussian n SG8-0750 circular 336.0 - 8.92 SG8-0800 circular 397.3 - 11.86 SG8-1100 circular 483.0 - 8.57 SG8-1800 circular 956.0 - 24.94 SG8-2000 circular 909.6 - 15.68 SG10-0400 circular 233.0 - 16.66
Continuous Phase Plates (CPPs) for NIF
The table below summarizes spatial profile parameters for NIF phase plates currently supported by VISRAD.
NIF CPP HWHM R-major (mm) HWHM R-minor (mm) Supergaussian n * 0.7-Inner-2w 577 413 2.0 0.7-Outer-2w 415 240 2.0 1.0-Inner-1w 824 590 2.0 1.0-Inner-2w 824 590 2.0 1.07-Inner-1w 882 631 2.0 1.07-Inner-2w 882 631 2.0 1.0-Outer-2w 593 343 2.0 1.07-Outer-2w 635 367 2.0 1.0-Outer-1w 593 343 2.0 1.07-Outer-1w 635 367 2.0 1.175-Inner-2w 968 693 2.0 1.175-Outer-2w 697 403 2.0 Rev3-Inner-2w 890 660 7.6 1.0 Rev1a-Inner-2w 860 610 8.0 Rev3-Outer-2w 640 370 4.8 Rev1-Outer-2w 620 360 4.5 No CPP 75 75 2.0 400 um CPP 189 189 7.145 3 mm 2W CPP 1575 1190 13.1
When users start up a completely new workspace for the NIF target chamber, a default CPP spatial profile is given for each beam that depends on the ring (cone) in which it resides. The default CPP profiles for each ring are:
NIF CPP Ring (Cone) Rev3-Inner-2w 23 and 157 1.0 Rev1a-Inner-2w 30 and 150 Rev3-Outer-2w 44 and 135 Rev1-Outer-2w 50 and 130
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* A default supergaussian index (n) of 2.0 is assumed for CPPs in which data was not available.
The table below summarizes spatial profile parameters for LMJ phase plates currently supported by VISRAD.
LMJ Profile R-major+ (mm) R-minor+ (mm) Supergaussian n Circular Type D 470 470 3.0 Circular Type E 750 750 4.5 Circular Type F 315 315 2.0 Elliptical Type A 750 375 3.1
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+ Radii at 3% of Imax .
The table below summarizes spatial profile parameters for GEKKO phase plates currently supported by VISRAD.
GEKKO Profile R-major (mm) R-minor (mm) Supergaussian n DPP-1 353.6 353.6 6.0
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