1 laser background
DESCRIPTION
Multiple Charged Ions Production From Xe + & Xe 2+ In Intense Laser Field. 1 Laser Background. 2 Apparatus Overview. 3 Ion Beam Properties. A Energy Spread B Spatial Spread. 4 Xe + & Xe 2+ In Laser. 5 Z-Scan of Laser Focus. BY M.SURESH. 6 Summary. Femtosecond Lasers. - PowerPoint PPT PresentationTRANSCRIPT
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eXenhXe 32 1 Laser Background
2 Apparatus Overview
3 Ion Beam PropertiesA Energy Spread
B Spatial Spread
4 Xe+ & Xe2+ In Laser
5 Z-Scan of Laser Focus
6 Summary
eXenhXe 242 eXenhXe 352 eXenhXe 462 eXenhXe 572
Multiple Charged Ions Production From Xe+ & Xe2+ In Intense Laser Field
BY M.SURESH
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Femtosecond Lasers
Ti: Sapphire at 800 nm (1.6 eV)
Chirped Pulse Amplification
Terrawatt (1012 W) LasersASTRA ~10 mJ in ~10 fs
High field physics > 1016 Wcm-2
1 au = 3 x 1016 Wcm-2
Repetition rate 10 Hz
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Apparatus Overview
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Laser AlignmentLaser Alignment
ShadowExit Window Entrance
Window
Two Wire Crosses
Laser Beam
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AnalyzerAnalyzer
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Analyzer Plate Scan for Multiply Charged Ions of
andXe+
1.15E -1
0.00E +0
2.42E -2
4.58E -2
7.33E -2
8.92E -2
5.00E -6
0.00E +0
2.00E -7
4.00E -7
6.00E -7
8.00E -7
1.00E -6
1.20E -6
1.40E -6
1.60E -6
1.80E -6
2.00E -6
2.20E -6
2.40E -6
2.60E -6
2.80E -6
3.00E -6
3.20E -6
3.40E -6
3.60E -6
3.80E -6
4.00E -6
4.20E -6
4.40E -6
4.60E -6
4.80E -6
190 2 4 6 8 10 12 14 16 18
Voltage (V)
Xe2+
Voltage (V)
Tim
e of
Fli
ght
Tim
e of
Fli
ght
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Spatial Spread Measurement
1 mm Aperture
0.5 mm Aperture0.13 mm Slit
ION BEAM CHARACTERIZATION
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0 10 20 30 40 50
0
50
100
150
200
250
300
Spatial Spread Scan of He+ Ion Beam
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Spatial Spread of He+ and Ar+ at Different Ion Beam Energies
Type of Ion Energy (KeV) Spatial Spread(mm)
1 1.27
He+ 2 1.07
3 0.97
1 1.35
Ar+ 2 1.2
3 1.03Spatial Spread Depends On Energy Spatial Spread Depends On Energy And Mass Of The BeamAnd Mass Of The Beam
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Spatial Spread Scan of He+ Ion Beam Selected by 1mm & 2mm Apertures
Current Decreases From 300nA To 120nACurrent Decreases From 300nA To 120nA
2 mm Aperture2 mm Aperture
1 mm Aperture1 mm Aperture
Ion
bea
m C
urr
ent
(nA
)
Slit Position (mm)
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Spatial Spread of He+ and Ar+ (3keV) With 1mm & 2mm Apertures
Spatial Spread Depends on Aperture Size
Type of Ion
2mm Aperture
1mm Aperture
He+ 0.97 0.56
Ar+ 1.03 0.66
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Spatial Spread of HeSpatial Spread of He++ Ion Beam Ion Beam at Different Focusing at Different Focusing
ConditionsConditionsEnergyEnergy Without Without
FocusingFocusing Focused Focused Through Through 0.5mmApertur0.5mmAperturee
1keV1keV 1.27mm1.27mm 0.41mm0.41mm
3keV3keV 0.97mm0.97mm 0.34mm0.34mm
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Energy spread
Energy Spread
1mm Aperture 2mm Aperture
1kV Energy 2kV Energy
Different DischargeConstant Pressure
Different PressureConstant Discharge
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Energy Spread of 1keV and 2keV Ar+ - 2 mm Aperture
Nergy Spread(eV)
1000 1200 1400 1600 1800 2000
10
20
30
40
50
60
70
Discharge Voltage (V)
En
erg
y S
pre
ad
(e
V)
1KeV
2KeV
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ISS Z-Scan
2
0
20
2
2),(
1
2exp
1Z
Z
r
Z
Z
II
o
ozr
200 zDf 20
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6.0E-9
-1.0E-9
0.0E+0
1.0E-9
2.0E-9
3.0E-9
4.0E-9
5.0E-9
20.00000.0000 5.0000 10.0000 15.0000
Z-scan of Xe3+ from Xe2+ Z -scan of Xe4+ from Xe2+
1.1E-8
-1.0E-9
0.0E+0
1.0E-9
2.0E-9
3.0E-9
4.0E-9
5.0E-9
6.0E-9
7.0E-9
8.0E-9
9.0E-9
1.0E-8
25.00000.0000 5.0000 10.000015.000020.0000
Sig
nal
Z-Position (mm)
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Z-scan of XeZ-scan of Xe6+6+ from Xe from Xe2+2+ Z-scan of XeZ-scan of Xe7+7+ from Xe from Xe2+2+
Z-Position (mm)
Sig
nal
2.5E-9
-5.0E-10
-2.5E-10
0.0E+0
2.5E-10
5.0E-10
7.5E-10
1.0E-9
1.3E-9
1.5E-9
1.7E-9
2.0E-9
2.3E-9
25.00000.0000 5.0000 10.0000 15.0000 20.0000
0.0E+0
-1.4E-9
-1.2E-9
-1.0E-9
-8.0E-10
-6.0E-10
-4.0E-10
-2.0E-10
6.00000.0000 1.0000 2.0000 3.0000 4.0000 5.0000
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SummarySummary
First experimental results First experimental results onon XeXe22++ in in intenseintense laser laser fieldfield
Less Than 2% Energy spread
0.34mm Spatial Spread
Up to Xe7+ from both Xe+ and Xe2+