Download - Peter Konik
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Monte-Carlo simulations of thermal neutron filter and
neutron guide system for REVERANS reflectometer
Peter Konik
Petersburg Nuclear Physics Institute, Gatchina, RussiaSaint-Petersburg State University, Saint-Petersburg, Russia
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Our facilities
REVERANS reflectometer
Thermal neutron filter
Neutron guide
Current work
Conclusion
Contents
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Our facilities
WWR-M
Operational since 195918 MWt3·1014 n/cm2·s
PIK
First critical 2011100 MWt4.5·1015 n/cm2·s3 cold neutron sources1 hot neutron source50 instruments
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Vertical scattering plane Both free and interface surfaces Phase boundaries Liquids, solutions, suspensions, colloid
solutions of nanoparticles, liquid crystals
REVERANS reflectometer
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REVERANS at WWR-M
+ more neutrons- direct view
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Thermal neutron filter
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MC simulations
Collimator and filter width 28 mm
Entry window height 80 mm
Exit window height 13.3 mm
Number of collimator channels
3
Entry collimator length 1.77 m
Exit collimator length 1.5 m
Mirror coating m = 2.25
Mirror width 0.38 mm
Critical wavelength 6 Å
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PIK neutron guide hall
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Guide simulations
-0.06 -0.04 -0.02 0 0.02 0.04 0.06
-0.1
-0.08
-0.06
-0.04
-0.02
0
0.02
0.04
0.06
0.08
0.1
x [m]
[ReactorTubeXY] ReactorTube.XY: Intensity Position Position Monitor (Square) per bin I Ierr N=[1.03797 0.000341065 9.26192e+006]
Min=0; Max=4.23222e-005; Mean= 2.59492e-005; X0=2.77173e-006; dX=0.0346387; Y0=-7.0141e-006; dY=0.0576173;
y [m
]
0
0.5
1
1.5
2
2.5
3
3.5
4
x 10-5
-3 -2 -1 0 1 2 3-8
-6
-4
-2
0
2
4
6
8
[ReactorTubedXdY] ReactorTube.dXdY: Intensity Divergence Divergence Monitor (Square) per bin I Ierr N=[1.03797 0.000341065 9.26192e+006]
Min=0; Max=0.000176385; Mean= 2.59492e-005; X0=0.000416564; dX=0.975999; Y0=0.000104928; dY=2.4769;
Hor. Divergence [deg]
V
ert.
Div
erge
nce
[deg
]
2
4
6
8
10
12
14
16
x 10-5
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-0.06 -0.04 -0.02 0 0.02 0.04 0.06
-0.1
-0.08
-0.06
-0.04
-0.02
0
0.02
0.04
0.06
0.08
0.1
[Coll4XY] Coll4.XY: Intensity Position Position Monitor (Square) per bin I Ierr N=[0.0518884 7.10727e-005 1.00685e+006]
Min=0; Max=1.03948e-005; Mean= 1.29721e-006; X0=1.01155e-005; dX=0.00875294; Y0=0.000123982; dY=0.0570388;
x [m]
y [m
]
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
x 10-5
Guide simulations
-0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
[Coll4dXdY] Coll4.dXdY: Intensity Divergence Divergence Monitor (Square) per bin I Ierr N=[0.0464921 6.87967e-005 729792]
Min=2.51253e-024; Max=4.66167e-006; Mean= 1.1623e-006; X0=-0.000604858; dX=0.437428; Y0=0.000314909; dY=0.601589;
Hor. Divergence [deg]
V
ert.
Div
erge
nce
[deg
]0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
x 10-6
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Guide simulations
-0.02 -0.015 -0.01 -0.005 0 0.005 0.01 0.015 0.02-0.03
-0.02
-0.01
0
0.01
0.02
0.03
[BenderR1XY] BenderR1.XY: Intensity Position Position Monitor (Square) per bin I Ierr N=[0.00976103 3.02274e-005 223776]
Min=0; Max=1.60163e-006; Mean= 2.44026e-007; X0=0.000126811; dX=0.00898632; Y0=8.71252e-006; dY=0.0144685;
x [m]
y [m
]
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6x 10
-6
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
[BenderR1dXdY] BenderR1.dXdY: Intensity Divergence Divergence Monitor (Square) per bin I Ierr N=[0.00976103 3.02274e-005 221347]
Min=0; Max=2.99619e-006; Mean= 2.44026e-007; X0=-0.000615002; dX=0.451814; Y0=-0.00760648; dY=0.5982;
Hor. Divergence [deg]
Ver
t. D
iver
genc
e [d
eg]
0
0.5
1
1.5
2
2.5
x 10-6
Divergence!
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Hyperbolic mirror (i)
Cassegrain reflector
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Hyperbolic mirror (ii)
0 10 20 30 400
5
10
15
20
25
30
Angle between beam direction and axe, deg
e = 0.8
m valuedivergence increase
0 5 10 15 20 25 300
5
10
15
20
25
30
Angle between beam direction and axe, deg
e = 0.5
m valuedivergence increse
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MC simulation allow to:
Find optimal parameters
Handle complex geometry guides
Simulate new optical elements
Conclusion
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Dr. Evgeny Moskvin
Vladimir Zabenkin
Dr. Alexander Ioffe
Acknowledgement
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Thank you for attention!