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Phase Plate Parameters

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 .

 

Phase Plates for OMEGA EP

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.

 

Phase Plates for LMJ

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 .

 

Phase Plates for GEKKO

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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