PKE-Nefedov Symposium - 2004
description
Transcript of PKE-Nefedov Symposium - 2004
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PKE-Nefedov Symposium - 2004
Institute for High Energy Densities of RAS
Optical Diagnostics of Discharge Plasma
in PK-4 Project
Alexander Usachev
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Institute for High Energy Densities of RAS
1. Diagnostics of concentrations of excited neon atoms.
2. Developing of combined diagnostic probe-optic methods.
3. Control of plasma impurities.
Objectives:
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Optical Diagnostics of Plasma in PK-4 Project
Spectral Diagnostics
Glow Image Diagnostics
Institute for High Energy Densities of RAS
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Institute for High Energy Densities of RAS
Glow Image Diagnostics
Phantom-5 = 1
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Institute for High Energy Densities of RAS
300 350 400 450
0
0.2
0.4
0.6
0.8
1
The spectral transmittance of the PK4-chamber glass.
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Institute for High Energy Densities of RAS
0
0
000
)()(
~
eeeek
keek
df
NNZ
Emission Intensity of Ne
0
ik
ekNe NNI ~~
In the case of Te= const,
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Intensity vs Electron Density in DC-mode
-10 0 10PK-4 Tube R adius, m m
0
200
400
600
800
Ima
ge
In
ten
sity
, a.
u.
0
1
2
3
4
5
Ele
ctro
n D
en
city
, 1
08
cm-3250 Pa
15 Pa
100 Pa
Institute for High Energy Densities of RAS
mm
Scale
Ne:50 Pa
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Institute for High Energy Densities of RAS
Intensity vs Electron Density in DC/RF(i)-mode
-10 -5 0 5 10H , cm
0
4
8
12
16
n e, 1
08 cm
-3, T
e, e
V,
Iin
t, ar
b. u
.
n eTe
In tensity
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Intensity Distribution in 2RF(i)-mode
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Institute for High Energy Densities of RAS
Temporal Behavior of DC Discharge20000 fps 20 fps
10 Pa
50 Pa
300 Pa
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Spectral Diagnostics:
1. Emission spectroscopy: measurements of concentration of highly excited neon atoms.
2. Absorption spectroscopy: measurements of concentration of metastable and resonance neon atoms.
3. Emission spectroscopy: control of plasma impurities.
Institute for High Energy Densities of RAS
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Emission spectroscopy: measurements of concentration of highly excited neon atoms
by the method of absolute intensities
Institute for High Energy Densities of RAS
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Institute for High Energy Densities of RAS
Emissive spectrum of Ne in DC discharge: 3 mA; 50 Pa.
500 550 600 650 700 750 800W avelength, nm
0
2
4
6
8
10
300 350 400 450 500W avelength, nm
0
2
4
6
8
10
2p 1s
3p 1s
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Institute for High Energy Densities of RAS
22121 NhvAP
Emission spectroscopy: measurements of concentration of highly excited neon atoms
by the method of absolute intensities
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Absolute concentrations of 2p and 3p levels of neonin RF(i) discharge at 10, 100 and 1000 Pa.
Institute for High Energy Densities of RAS
1 8 1 8 . 5 1 9 1 9 . 5 2 0 2 0 . 5 2 1
E , eV
1e+004
1e+005
1e+006
1e+007
1e+008
N/g
, c
m-3
2p-levels
3p-levels
1000 Pa
100 Pa
10 Pa
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Institute for High Energy Densities of RAS
Local Thermal Equilibrium of 2p-levels of Neonin RF(i) discharge at 10, 100 and 1000 Pa
18.3 18.4 18.5 18.6 18.7 18.8 18.9
E, eV
1e+005
1e+006
1e+007
1e+008
N/g
, cm
-3
0.21 eV
0.42 eV
0.55 eV
Tn = 0.026 eV
Te = 3 eV
p=1000 Pa
p=100 Pa
p=10 Pa
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Institute for High Energy Densities of RAS
Absorption spectroscopy: measurements of concentration of metastable and resonance
neon atoms by the method of one mirror.
Spectrometertranslation
High voltage CM SM
CM
PMT
C
Lens
PK4 chamber
Mirror
Chopper
PC
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Institute for High Energy Densities of RAS
Measurements of concentration of metastable and resonance neon atoms by the method of one mirror.
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Institute for High Energy Densities of RAS
Typical Spectrogram.
626 628 630 632 634
W avelength, nm
0
1
2
3
Inte
nsity
, a.
u.
U2
U1
RU
U
lk
eff
11ln
1
1
2
R=0.92
112
2
0
2ln2Nf
cm
ek
eD
For Doppler shape of line:
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Institute for High Energy Densities of RAS
16.6 16.65 16.7 16.75 16.8 16.85
E 1, eV
2e+009
4e+009
6e+009
8e+009
1e+010
N1
/ g1
,
cm-3
1 m A , 50 Pa
16.6 16.65 16.7 16.75 16.8 16.85
E 1, eV
1e+008
1e+009
1e+010
N1 /
g 1 ,
cm
-3
5 m A, 50 Pa
16.6 16.65 16.7 16.75 16.8 16.85
E 1, eV
1e+008
1e+009
1e+010
N1
/ g1
,
cm-3
15 m A , 50 P a
IDC = 1 mA
IDC = 5 mA
IDC = 15 mA
Population of 1s-Levels vs Direct Current (at 50 Pa)
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Institute for High Energy Densities of RAS
0 4 8 12 16
IDC , m A
0
1e+010
2e+010
3e+010
N3S
, cm
-3
Total Density of Ne-3S Atoms vs Direct Current
4
13
iiiS NgN
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Institute for High Energy Densities of RAS
Population of 1s Levels vs Ne Pressure
16.6 16.65 16.7 16.75 16.8 16.85E 1, eV
1e+008
1e+009
1e+010N
1/ g
1, c
m-3
12 Pa, 15 m A
16.6 16.65 16.7 16.75 16.8 16.85E 1, eV
1e+008
1e+009
1e+010
N1/
g1,
cm
-3
25 Pa, 15 m A
16.6 16.65 16.7 16.75 16.8 16.85E 1, eV
1e+008
1e+009
1e+010
N1/ g
1, c
m-3
50 P a, 15 m A
16.6 16.65 16.7 16.75 16.8 16.85E 1, eV
1e+008
1e+009
1e+010
N1/
g1,
cm
-3
100 Pa, 15 m A
p = 12 Pa
p = 25 Pa p = 100 Pa
p = 50 Pa
m m rm m rr
m m rrm m rr
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Institute for High Energy Densities of RAS
Emission spectroscopy -Diagnostics of Gas Mixtures:
1. Ne + 2%Xe.
2. Ne + O2.
3. Ne + Air Leakage.
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Institute for High Energy Densities of RAS
300 400 500 600 700
W avelength, nm
0
2
4
6
8
10
Intensity, a.u.
300 400 500 600 700
W avelength, nm
0
2
4
6
8
10
Intensity, a.u.
Emission Spectra of pure Ne and Ne+2%Xe-mixture
50 Pa of Ne, 3 mA_433V
50 Pa of Ne+2%Xe, 3 mA_400V
Ne(2p 1s)
Xe(2p 1s)
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Institute for High Energy Densities of RAS
Reference Spectra of Pollutants: O2 and N2
200 300 400 500 600 700 800
nm
0
2
4
6
8
10
200 300 400 500 600 700 800
nm
0
0.4
0.8
1.2
1.6
2
H
O2
N2
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Institute for High Energy Densities of RAS
UV Reference Spectra of Pollutants: O2 and N2
O2
N2
300 320 340 360 380 400
nm
0
0.4
0.8
1.2
1.6
2
300 320 340 360 380 400
nm
0
2
4
6
8
10
Used O2-band
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Institute for High Energy Densities of RAS
OH Spectra of Pollutant H2O
OH
300 310 320 330
0
0.1
0.2
0.3
0.4
0.5
N e (10atm )
300 310 320 330
W avelength, nm
0
0.1
0.2
0.3
0.4
0.5
Intensity, a.u.
N e: N ew _ Ballon 150atm2200V , 50/50m km
Old Ne balloon
New Ne balloon
N2
N2
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Emission Spectra of pure Ne and Ne+0.05%O2, Ne+0.15%O2 -mixtures
300 320 340 360 380 400
W avelength, nm
0
1
2
3
4
Inte
nsity
, a.
u.
N e: N ew _ Ballon 150atm2200V , 50/50m km
320 324 328 332 336 340
W avelength, nm
0
0.05
0.1
0.15
0.2
0.25
Inte
nsity
, a.
u.
N e: N ew _ Ballon 150atm2200V , 50/50m km
300 320 340 360 380 400
W avelength, nm
0
1
2
3
4
Inte
nsity
, a.
u.
N e + 0.15O 22200V , 50/50m km
320 324 328 332 336 340
W avelength, nm
0
0.05
0.1
0.15
0.2
0.25
Inte
nsity
, a.
u.
N e + 0.15O 22200V , 50/50m km
300 320 340 360 380 400
W avelength, nm
0
1
2
3
4
Inte
nsity
, a
.u.
N e + 0.05O 22200V , 50/50m km
320 324 328 332 336 340
W avelength, nm
0
0.05
0.1
0.15
0.2
0.25
Inte
nsity
, a.
u.
N e + 0.05O 22200V , 50/50m km
Ne Ne+0.05%O2 Ne+0.15%O2
Institute for High Energy Densities of RAS
O2-bandO2-band
N2-band N2-bandN2-band
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Institute for High Energy Densities of RAS
Comparison of Spectroscopic and Probe Datafor Ne, Ne+0.05%O2 and Ne+0.15%O2 -mixtures
0 0.05 0.1 0.15
0
1
2
3
4
5
Spe
ctra
l Int
ensi
ty,
a.u.
0
4
8
12
Ele
ctro
n de
ncity
, 10
7 cm
-3
E
INe
ne
IO2
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Institute for High Energy Densities of RAS
320 330 340 350
0
1
2
3
4
5
nn0
320 330 340 350
0
1
2
3
4
5
nn1
320 330 340 350
0
1
2
3
4
5
nn2
320 330 340 350
0
1
2
3
4
5
nn3
320 330 340 350
0
1
2
3
4
5
nn4
320 330 340 350
0
1
2
3
4
5
nn5
Spectral Intensities of Ne, N2 and O2 vs Air Addition
NeNe
Ne
NeNe
NeO2 O2
N2
N2N2
N2
N2
N2
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Institute for High Energy Densities of RAS
0 0.01 0.02 0.03
Volum e part o f A ir
0
40
80
120
Spe
ctra
l Int
ensi
ty,
a. u
.Comparison of Spectral and Probe Data Drifts at Air Leakage
0 0.005 0.01 0.015 0.02 0.025
Partia l A ir P ressure in N e
0
2
4
6
8
10
E,
ne,
T
e
E
n e, 1m A
n e, 3m A
T e
O210
Ne
N2
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Institute for High Energy Densities of RAS
1..
2..
3..
Conclusion:
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Thank you for your attention