k. laihemprinceton meeting princeton meeting 22-05-2006 status report simulation studies e166...
Post on 20-Dec-2015
216 views
TRANSCRIPT
![Page 1: K. LaihemPrinceton meeting Princeton meeting 22-05-2006 Status Report Simulation studies E166 experiment Karim Laihem](https://reader036.vdocuments.site/reader036/viewer/2022062714/56649d435503460f94a1f64f/html5/thumbnails/1.jpg)
K. Laihem Princeton meeting
Princeton meeting 22-05-2006
Status Report Simulation studies E166 experiment
Karim Laihem
![Page 2: K. LaihemPrinceton meeting Princeton meeting 22-05-2006 Status Report Simulation studies E166 experiment Karim Laihem](https://reader036.vdocuments.site/reader036/viewer/2022062714/56649d435503460f94a1f64f/html5/thumbnails/2.jpg)
K. Laihem Princeton meeting
•What we have achieved in E166 ? (e+ and photon asymmetry)
Convert the X axis from current to MeV
Co
nve
rt t
he
asym
met
ry t
o
po
lari
zati
on
![Page 3: K. LaihemPrinceton meeting Princeton meeting 22-05-2006 Status Report Simulation studies E166 experiment Karim Laihem](https://reader036.vdocuments.site/reader036/viewer/2022062714/56649d435503460f94a1f64f/html5/thumbnails/3.jpg)
K. Laihem Princeton meeting
Updated geometry E166_Geant4_Simulation
![Page 4: K. LaihemPrinceton meeting Princeton meeting 22-05-2006 Status Report Simulation studies E166 experiment Karim Laihem](https://reader036.vdocuments.site/reader036/viewer/2022062714/56649d435503460f94a1f64f/html5/thumbnails/4.jpg)
K. Laihem Princeton meeting
18”
Entranceregion
Exitregion
![Page 5: K. LaihemPrinceton meeting Princeton meeting 22-05-2006 Status Report Simulation studies E166 experiment Karim Laihem](https://reader036.vdocuments.site/reader036/viewer/2022062714/56649d435503460f94a1f64f/html5/thumbnails/5.jpg)
K. Laihem Princeton meeting
SpectrometerConversion target
Reconversion target
3.6”
7.78”
7.9”
9.4”
sole
noi
d
Entranceregion
Exitregion
![Page 6: K. LaihemPrinceton meeting Princeton meeting 22-05-2006 Status Report Simulation studies E166 experiment Karim Laihem](https://reader036.vdocuments.site/reader036/viewer/2022062714/56649d435503460f94a1f64f/html5/thumbnails/6.jpg)
K. Laihem Princeton meeting
-10 -8 -6 -4 -2 0 2 4 6 8 10
0
5
10
15
20
25
30 Data: Data22_BModel: GaussAmp Chi^2 = 0.20189R^2 = 0.99823 y0 0.00088 ±0xc 0.0 ±0.01116w 1.89446 ±0A 29.2 ±0
Axi
al F
ield
[G/A
]
Longitudinal Probe position Z [cm]
Solenoid Axial field.The fit function is a Gaussian profile
2
20
20)( w
zz
AeBzB
Where the coordinate z is given in centimeter.
984.1 ,0
2.29 ,00088.0
0
0
Wz
AB
Solenoid magnetic field. (SLAC’s measurements)
82
2
3
3 r
dz
Bd
dz
dBrBr
0B
2
22
4)(
dz
BdrZBBZ (1)
(2)
(3)
![Page 7: K. LaihemPrinceton meeting Princeton meeting 22-05-2006 Status Report Simulation studies E166 experiment Karim Laihem](https://reader036.vdocuments.site/reader036/viewer/2022062714/56649d435503460f94a1f64f/html5/thumbnails/7.jpg)
K. Laihem Princeton meeting
MERMAID field map implementation into E166_G4_SIM
X
Y
Z
(i,j,k)
(i+1,j,k)
(i,j+1,k)
(i+1,j+1,k)
(i,j,k+1) (i,j+1,k+1)
(i+1,j,k+1)
(i+1,j+1,k+1)
Z
X
Y
e+/e- Track
Figure 19. Scheme of one unitary segment for the 3D interpolation.
Figure 20. Scheme of the 3D segmentation using the unitary cube method for the field map implementation
![Page 8: K. LaihemPrinceton meeting Princeton meeting 22-05-2006 Status Report Simulation studies E166 experiment Karim Laihem](https://reader036.vdocuments.site/reader036/viewer/2022062714/56649d435503460f94a1f64f/html5/thumbnails/8.jpg)
K. Laihem Princeton meeting
IL = 0 A IL = 150 A IL = 350 A
Solenoid focusing effect.
e+ 2D Spatial distribution at the Entrance of the spectrometer.For different IL value (IL = 0, 150, 350 A) (Spectrometer OFF). Focusing effect of the lens is shown
![Page 9: K. LaihemPrinceton meeting Princeton meeting 22-05-2006 Status Report Simulation studies E166 experiment Karim Laihem](https://reader036.vdocuments.site/reader036/viewer/2022062714/56649d435503460f94a1f64f/html5/thumbnails/9.jpg)
K. Laihem Princeton meeting
IS= 120IL = 200
IS= 160IL = 250
e+ spatial distribution showing the density(A), at the entrance of spectrometer(B) at the exit of spectrometer (C) and at the reconversion target for different setting points IS and IL.
IS= 160IL = 250
![Page 10: K. LaihemPrinceton meeting Princeton meeting 22-05-2006 Status Report Simulation studies E166 experiment Karim Laihem](https://reader036.vdocuments.site/reader036/viewer/2022062714/56649d435503460f94a1f64f/html5/thumbnails/10.jpg)
K. Laihem Princeton meeting
E166_G4_SIM
Figure 33. Positron energy versus spectrometer current.
80 100 120 140 160 180 2002,5
3,0
3,5
4,0
4,5
5,0
5,5
6,0
6,5
7,0
7,5
8,0
8,5
9,0 G4 simulation ( = 0) MERMAID ( = 0) G4 simulation ( = 4) (140, 160 and 180 extrapol from 100) MERMAID ( = 4) G4 simulation ( = 4) (180 extrapol from linear fit)
Pos
itron
Ene
rgy
[MeV
]
Spectrometer current IS [A]
Ee+(180)=7.4 MeV
This point can not be seen by the simulation
If we use the First harmonic
(Ecutoff = 8.3 MeV)
? To be clarified
![Page 11: K. LaihemPrinceton meeting Princeton meeting 22-05-2006 Status Report Simulation studies E166 experiment Karim Laihem](https://reader036.vdocuments.site/reader036/viewer/2022062714/56649d435503460f94a1f64f/html5/thumbnails/11.jpg)
K. Laihem Princeton meeting
(E166 Zeuthen group)
![Page 12: K. LaihemPrinceton meeting Princeton meeting 22-05-2006 Status Report Simulation studies E166 experiment Karim Laihem](https://reader036.vdocuments.site/reader036/viewer/2022062714/56649d435503460f94a1f64f/html5/thumbnails/12.jpg)
K. Laihem Princeton meeting
E166_G4_SIM9 Xtals
![Page 13: K. LaihemPrinceton meeting Princeton meeting 22-05-2006 Status Report Simulation studies E166 experiment Karim Laihem](https://reader036.vdocuments.site/reader036/viewer/2022062714/56649d435503460f94a1f64f/html5/thumbnails/13.jpg)
K. Laihem Princeton meeting
7%
-7%
N = 10 4
E e+ = 3.7 MeVP e+ = 70%
N = 10 4
E e+ = 3.7 MeVP e+ = 70%
300 bunchesCPU time ~24h
Asymmetry % = 0.43 ± 1.3
Prelim
inary
![Page 14: K. LaihemPrinceton meeting Princeton meeting 22-05-2006 Status Report Simulation studies E166 experiment Karim Laihem](https://reader036.vdocuments.site/reader036/viewer/2022062714/56649d435503460f94a1f64f/html5/thumbnails/14.jpg)
K. Laihem Princeton meeting
100%
-100%
N = 10 4
E e+ = 7 MeVP e+ = 100%
N = 10 4
E e+ = 7 MeVP e+ = 100%
150 bunchesCPU time ~17h
Asymmetry % = 13 ± 1.4
Prelim
inary
![Page 15: K. LaihemPrinceton meeting Princeton meeting 22-05-2006 Status Report Simulation studies E166 experiment Karim Laihem](https://reader036.vdocuments.site/reader036/viewer/2022062714/56649d435503460f94a1f64f/html5/thumbnails/15.jpg)
K. Laihem Princeton meeting
Positron Energy
[MeV]
Positron Polarization
[%]
Iron Polarization
[%]
Asymmetry
[%]
Analyzingpower
[%]
3.7 70 7 0.43 ± 1.3 8.77
7 99 99 13 ± 1.4 13
Electron Energy
[MeV]
Polarization
[%]
Iron
Polarization
[%]
Asymmetry
[%]
Analyzing
power
[%]
7 99 99 15 ± 1.0 15
Preliminary Preliminary TestWithout Annihilation (polarization=0)
![Page 16: K. LaihemPrinceton meeting Princeton meeting 22-05-2006 Status Report Simulation studies E166 experiment Karim Laihem](https://reader036.vdocuments.site/reader036/viewer/2022062714/56649d435503460f94a1f64f/html5/thumbnails/16.jpg)
K. Laihem Princeton meeting
Summary
• Code optimization
• Computer power to see these small asymmetries with reasonable errors.
• -………
• -…………..
• -……………….
• -……………………