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Chapter 3 Laser Absorption in Plasmas. OMEGA EP LLE, U of Rochester, USA. 3.1 Electromagnetic Waves in Plasmas. Current induced by Electron Motion. Dispersion Relation. Plasma Frequency. Cut-off Frequency. Earth Ionosphere. Phase Velocity. Group Velocity. Energy Densities. - PowerPoint PPT Presentation
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Chapter 3
Laser Absorption in Plasmas
OMEGA EPLLE, U of Rochester, USA
t
B
E
t
EjB 00
jEBEEBBE
0
2
0
20
11
2
1
t
jEBEBE
0
2
0
20
11
2
1
t
3.1 Electromagnetic Waves in Plasmas
m
e
dt
d Ev vj en
EEEkk2
22
2
ck p
0
22
m
nep
2222 pck
Current induced by Electron Motion
Dispersion Relation
Plasma Frequency
Cut-off Frequency
Earth Ionosphere
21
2
2
1
pp c
kv
21
2
2
1
pg c
dk
dv
202
1EEW
0
2
2
1
B
BW2
2
1mnvWe
Phase Velocity
Group Velocity
Energy Densities
3.2 General Formulation of Absorption
3.3 Classical Absorption (Inverse-Bremstrahlung)
dk
dt
r
dr
dtvg c2 k
2 p2 r c2k2
r k constant
ILk IL,0
k exp S
S abs dt S abs
Ý r dr
Ray-tracing and laser absorption
r2 Ý h : constant
2 p2
2
c2 Ý r 2 h2
r2
S 1
cabs 1
p
2
h2
c2r2
1/ 2
dr
abs
4 3 e6Z2nen i
32 2mTe 3/ 2 nIB
p
2
n r ncr
r2
S abs
c
r
rt
2
1
/ 1
1 / 2
rt2
h2
c2
/ 1
15
Classical absorption
1
cK
2peei
abs
2/3
eB2
2e
63
)Tmk2(c3
lnZne422/3
e
2e
T
Zn
Heating rate Relaxation rate
Hiper-Maxwell Distribution
Announcement
You can download the viewgraphs from Chapter 1 to Chapter 5
At http://ips.physics.sjtu.edu.cn/
Chapter 6 to 8 will be able to be download from
Wednesday in this week
3.4 Resonance Absorption and Wave Breaking
Gintzburg Curve
21
Experimental Data
Wave Breaking
24
Wave-breaking
26
High Energy Electron Production
Temperature Effect
Density Modification by Ponderomotive Force
EjBEBE
)()](2
[ 02220 cc
t
cIWc /42
2220
BE
IIIt
Energy Conservation Equation of EM Wave
Energy Density of EM Wave
Transport Equation of Radiation
3.5 Conservation Law (Summary)
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