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PKE-Nefedov Symposium - 2004
Optical Diagnostics
of Discharge Plasma
in PK-4 Project
Alexander Usachev
Institute for High Energy Densities of RAS
Objectives:
1. Diagnostics of concentrations of excited neon
atoms.
2. Developing of combined diagnostic probe-optic
methods.
3. Control of plasma impurities.
Institute for High Energy Densities of RAS
Optical Diagnostics of Plasma
in PK-4 Project
Glow Image
Diagnostics
Spectral
Diagnostics
Institute for High Energy Densities of RAS
Glow Image Diagnostics
Phantom-5
пЃ§=1
Institute for High Energy Densities of RAS
The spectral transmittance of the PK4-chamber glass.
1
0 .8
0 .6
0 .4
0 .2
0
300
350
400
Institute for High Energy Densities of RAS
450
Emission Intensity of Ne
п‚ЅkпЂѕ
п‚ЅiпЂѕ
п‚Ѕ0пЂѕ
Z 0 k ~ N 0 N e пЃіпЃµ e
0k
пЂЅ
п‚Ґ
пЂЅ пѓІ пЃі 0 k (пЃµ e ) пѓ— f (пЃµ e ) пѓ— пЃµ e d пЃµ e
0
In the case of Te= const,
I Ne ~ N k ~ N e
Institute for High Energy Densities of RAS
Intensity vs Electron Density in DC-mode
800
5
250 Pa
600
100 Pa
Ne:
50 Pa
4
3
15 Pa
400
2
200
1
0
0
-1 0
0
P K -4 T u b e R a d iu s , m m
Institute for High Energy Densities of RAS
10
E le c tro n D e n city , 1 0 8 cm -3
mm
Im a g e In te n sity , a .u .
Scale
Intensity vs Electron Density in DC/RF(i)-mode
n e , 1 0 8 c m -3 , T e , e V ,
I in t, a rb . u .
16
12
ne
Te
8
In te n sity
4
0
-1 0
-5
0
5
10
H , cm
Institute for High Energy Densities of RAS
Intensity Distribution in 2RF(i)-mode
Temporal Behavior of DC Discharge
20000 fps пѓћ 20 fps
10 Pa
50 Pa
300 Pa
Institute for High Energy Densities of RAS
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
Emission spectroscopy:
measurements of concentration of highly excited neon atoms
by the method of absolute intensities
Institute for High Energy Densities of RAS
Emissive spectrum of Ne in DC discharge: 3 mA; 50 Pa.
10
10
8
8
6
6
4
4
2
2
2p п‚® 1s
3p п‚® 1s
0
0
300
350
400
W a v e le n g th , n m
450
55000
0
550
600
650
700
W a v e le n g th , n m
Institute for High Energy Densities of RAS
750
800
Emission spectroscopy:
measurements of concentration of highly excited neon atoms
by the method of absolute intensities
PпЃ¬ пЂЅ A21 пѓ— hv 21 пѓ— N 2
Institute for High Energy Densities of RAS
Absolute concentrations of 2p and 3p levels of neon
in RF(i) discharge at 10, 100 and 1000 Pa.
1e+008
1e+007
N /g , cm -3
1000 Pa
100 Pa
1e+006
10 Pa
2p-levels
1e+005
3p-levels
1e+004
18
1 8 .5
19
1 9 .5
20
E, eV
Institute for High Energy Densities of RAS
2 0 .5
21
Local Thermal Equilibrium of 2p-levels of Neon
in RF(i) discharge at 10, 100 and 1000 Pa
1e+008
T n = 0 .0 2 6 e V
0 .2 1 e V
1e+007
N /g , cm -3
p=1000 Pa
0 .4 2 e V
0 .5 5 e V
p=100 Pa
1e+006
p=10 Pa
Te = 3 eV
1e+005
1 8 .3
1 8 .4
1 8 .5
1 8 .6
1 8 .7
1 8 .8
E, eV
Institute for High Energy Densities of RAS
1 8 .9
Absorption spectroscopy:
measurements of concentration of metastable and resonance
neon atoms by the method of one mirror.
Mirror
Chopper
PK4 chamber
Lens
C
PC
Spectrometer
translation
CM
High voltage
PMT
CM SM
Institute for High Energy Densities of RAS
Measurements of concentration of metastable and
resonance neon atoms by the method of one mirror.
Institute for High Energy Densities of RAS
Typical Spectrogram.
In te n s ity , a .u .
3
k пЂЅ
U2
2
1
l eff
пѓ©пѓ¦ U 2
пѓ¶ 1пѓ№
ln пѓЄ пѓ§пѓ§
пЂ­ 1 пѓ·пѓ· пѓ— пѓє
пѓЄпѓ« пѓЁ U 1
пѓё R пѓєпѓ»
R=0.92
1
For Doppler shape of line:
U1
k0 пЂЅ
0
626
628
630
632
2
пЃ¤пЃ®
пѓ—
D
634
W a v e le n g th , n m
Institute for High Energy Densities of RAS
ln 2
пЃ°
пѓ—
пЃ°e
2
mec
пѓ— f 12 N 1
Population of 1s-Levels vs Direct Current (at 50 Pa)
1e+010
IDC = 5 mA
N1 / g1 ,
cm -3
5 m A, 50 Pa
IDC = 1 mA
IDC = 15 mA
1e+009
1e+010
1e+010
15 m A, 50 Pa
1 m A, 50 Pa
1 6 .6
6e+009
1 6 .6 5
1 6 .7
1 6 .7 5
E 1, e V
N1 / g1 ,
N1 / g1 ,
cm -3
1e+008
cm -3
8e+009
4e+009
1 6 .8
1 6 .8 5
1e+009
2e+009
1e+008
1 6 .6
1 6 .6 5
1 6 .7
1 6 .7 5
1 6 .8
1 6 .8 5
1 6 .6
1 6 .6 5
1 6 .7
E 1, e V
Institute for High Energy Densities of RAS
1 6 .7 5
E 1, e V
1 6 .8
1 6 .8 5
Total Density of Ne-3S Atoms vs Direct Current
4

3e+010
giNi
i пЂЅ1
2e+010
N 3 S , cm -3
N 3S пЂЅ
1e+010
0
0
4
8
ID C , m A
Institute for High Energy Densities of RAS
12
16
Population of 1s Levels vs Ne Pressure
1e+010
1e+010
50 Pa, 15 m A
N 1 / g 1 , cm -3
N 1 / g 1 , cm -3
1e+009
m
p = 50 Pa
p = 12 Pa
12 Pa, 15 m A
m
1e+009
m r m
r
r
1e+008
1e+008
1 6 .6
1 6 .6
1 6 .6 5
1 6 .7
1 6 .7 5
1 6 .8
1 6 .7
1 6 .7 5
1 6 .8
1 6 .8 5
E 1, e V
E 1, e V
1e+010
1 6 .6 5
1e+010
1 6 .8 5
100 Pa, 15 m A
25 Pa, 15 m A
p = 100 Pa
N 1 / g 1 , cm -3
N 1 / g 1 , cm -3
p = 25 Pa
1e+009
1e+009
m r m
m r m
r
1e+008
1 6 .6
1e+008
1 6 .6
1 6 .6 5
1 6 .7
1 6 .7 5
1 6 .8
1 6 .8 5
r
1 6 .6 5
1 6 .7
1 6 .7 5
E 1, e V
E 1, e V
Institute for High Energy Densities of RAS
1 6 .8
1 6 .8 5
Emission spectroscopy Diagnostics of Gas Mixtures:
1. Ne + 2%Xe.
2. Ne + O2.
3. Ne + Air Leakage.
Institute for High Energy Densities of RAS
Emission Spectra of pure Ne and Ne+2%Xe-mixture
10
Ne(2p п‚® 1s)
50 Pa of Ne, 3 mA_433V
Intensity, a.u.
8
6
4
2
0
300
400
500
W a v e le n g th ,
600
700
nm
10
In te nsity, a.u .
8
50 Pa of Ne+2%Xe, 3 mA_400V
Xe(2p п‚® 1s)
6
4
2
0
300
400
500
W a v e le n g th ,
600
nm
Institute for High Energy Densities of RAS
700
Reference Spectra of Pollutants: O2 and N2
2
1 .6
O2
1 .2
HпЃЎ
0 .8
0 .4
0
2 0 0
3 0 0
4 0 0
5 0 0
6 0 0
7 0 0
8 0 0
7 0 0
8 0 0
пЃ¬ пЂ¬пЂ n m
1 0
N2
8
6
4
2
0
2 0 0
3 0 0
4 0 0
5 0 0
6 0 0
пЃ¬ пЂ¬пЂ n m
Institute for High Energy Densities of RAS
UV Reference Spectra of Pollutants: O2 and N2
2
1 .6
O2
Used O2-band
1 .2
0 .8
0 .4
0
3 0 0
3 2 0
3 4 0
3 6 0
3 8 0
4 0 0
3 8 0
4 0 0
пЃ¬ пЂ¬пЂ n m
1 0
N2
8
6
4
2
0
3 0 0
3 2 0
3 4 0
3 6 0
пЃ¬ пЂ¬пЂ n m
Institute for High Energy Densities of RAS
OH Spectra of Pollutant H2O
0 .5
Ne
(1 0 a tm )
Old Ne balloon
0 .4
N2
0 .3
OH
0 .2
0 .1
0
300
310
320
330
0 .5
N e : N e w _ B a llo n 1 5 0 a t m
2 2 0 0 V , 5 0 /5 0 m k m
Intensity, a.u.
0 .4
New Ne balloon
0 .3
N2
0 .2
0 .1
0
300
310
W a v e le n g th ,
320
nm
Institute for High Energy Densities of RAS
330
Emission Spectra of pure Ne and
Ne+0.05%O2, Ne+0.15%O2 -mixtures
4
4
4
N e : N e w _ B a llo n 1 5 0 a tm
2 2 0 0 V , 5 0 /5 0 m k m
3
Ne
2
1
0
300
320
340
360
380
400
In te n s ity , a .u .
3
In te n s ity , a .u .
Ne+0.05%O2
2
1
0
0
300
320
W a v e le n g th , n m
340
360
380
300
400
0 .2 5
N e + 0 .1 5 пЂҐ O 2
2 2 0 0 V , 5 0 /5 0 m k m
N e + 0 .0 5 пЂҐ O 2
2 2 0 0 V , 5 0 /5 0 m k m
N2-band
In te n s ity , a .u .
0 .2
0 .1 5
0 .1
0 .2
0 .1 5
O2-band
0 .1
0 .0 5
0 .0 5
320
324
328
332
W a v e le n g th , n m
336
340
360
380
400
N2-band
O2-band
0 .1 5
0 .1
0 .0 5
0
0
340
0 .2 5
N e : N e w _ B a llo n 1 5 0 a tm
2 2 0 0 V , 5 0 /5 0 m k m
N2-band
320
W a v e le n g th , n m
W a v e le n g th , n m
0 .2 5
0 .2
Ne+0.15%O2
2
1
In te n s ity , a .u .
In te n s ity , a .u .
3
In te n s ity , a .u .
N e + 0 .1 5 пЂҐ O 2
2 2 0 0 V , 5 0 /5 0 m k m
N e + 0 .0 5 пЂҐ O 2
2 2 0 0 V , 5 0 /5 0 m k m
0
320
324
328
332
W a v e le n g th , n m
336
340
320
324
328
332
W a v e le n g th , n m
336
340
Comparison of Spectroscopic and Probe Data
for Ne, Ne+0.05%O2 and Ne+0.15%O2 -mixtures
5
ne
12
INe
3
E
8
2
4
1
IO2
0
0
0
0 .0 5
0 .1
0 .1 5
Institute for High Energy Densities of RAS
E le c tro n d e n c ity , 1 0 7 c m -3
S p e ctra l In te n s ity , a .u .
4
Spectral Intensities of Ne, N2 and O2 vs Air Addition
5
5
5
nn1
nn0
Ne
4
nn2
4
4
Ne
3
3
2
2
N2
1
N2
1
0
320
330
340
0
320
350
330
340
350
5
5
320
4
N2
Ne
2
N2
Ne
O2
0
350
Ne
O2
0
320
340
2
1
0
330
N2
3
2
1
1
350
4
3
3
340
nn5
nn4
4
330
5
nn3
320
N2
2
1
0
Ne
3
330
340
350
320
330
340
350
Comparison of Spectral and Probe Data Drifts at Air Leakage
10
N2
8
Te
80
E , n e, T e
S p e c tra l In te n s ity , a . u .
120
Ne
6
n e, 1 m A
4
40
E
O2п‚ґ10
2
n e, 3 m A
0
0
0
0 .0 1
0 .0 2
V o lu m e p a rt o f A ir
0 .0 3
0
0 .0 0 5
0 .0 1
0 .0 1 5
0 .0 2
P a rtia l A ir P re s s u re in N e
Institute for High Energy Densities of RAS
0 .0 2 5
Conclusion:
1..
2..
3..
Institute for High Energy Densities of RAS
Thank you for your attention
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