Fundamentals of Plasma Physics

Appendix C 525

Ion collisionless skin depth (assuming quasi-neutral plasma soniZ=ne

c

ωpi

=2. 3 × 108

√

A

Zne

m

Frequencies

Electron plasma frequency (p.126)

fpe=

ωpe

2 π

=

1

2 π

√

nee^2

ε 0 me

=9

√

neHz

Ion plasma frequency (p.126)

fpi=ωpi=

1

2 π

√

niq^2 i

ε 0 mi

=0. 21

√

Zne

A

Hz

Electron cyclotron frequency (p.79)

fce=

1

2 π

|ωce|=

eB

2 πme

=2. 8 × 1010 BHz

Ion cyclotron frequency (p.79)

fci=

1

2 π

|ωci|=

ZeB

2 πmi

=1. 55 × 107

ZB

A

Hz

Upper hybrid frequency (p.186)

fuh=

√

fpe^2 +fce^2

Lower hybrid frequency (p.186)

flh=

√

√

√

√

√

f^2 ci+

fpi^2

1+

fpe^2

fce^2

Diocotron frequency (pure electron plasma, p.462)

fdioc≃fpe^2 / 2 fce

Velocities

Electron thermal velocity (p.154)

vTe=

√

2 κTe

me

=5. 9 × 105

√

Tem s−^1

Ion thermal velocity (p.154)

vTi=

√

2 κTi

mi

=1. 4 × 104

√

Ti

A

m s−^1