Comparing Langmuir Probe Traces

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McNair Scholars Research Journal

Volume 3 | Issue 1 Article 4

January 2011

Comparing Langmuir Probe Traces of DierentDebye Length-to-Probe Radius Ratios

Mariano MarksEastern Michigan University, [email protected]

is Article is brought to you for free and open access by the Honors College at Digital Commons @ EMU. It has been accepted for inclusion in

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[email protected].

Marks, Mariano (2011) "Comparing Langmuir Probe Traces of Dierent Debye Length-to-Probe Radius Ratios,"McNair ScholarsResearch Journal: Vol. 3: Iss. 1, Article 4.Available at: hp://commons.emich.edu/mcnair/vol3/iss1/4
http://commons.emich.edu/mcnairhttp://commons.emich.edu/mcnair/vol3http://commons.emich.edu/mcnair/vol3/iss1http://commons.emich.edu/mcnair/vol3/iss1/4mailto:[email protected]:[email protected]:[email protected]:[email protected]://commons.emich.edu/mcnair/vol3/iss1/4http://commons.emich.edu/mcnair/vol3/iss1http://commons.emich.edu/mcnair/vol3http://commons.emich.edu/mcnair


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CT

DD

Mariano Marks

Dr. James Carroll, Mentor

INTRODUCTION

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Marks: Comparing Langmuir Probe Traces

Produced by The Berkeley Electronic Press, 2011


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n

and its energy kTe

kTe

.

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McNair Scholars Research Journal, Vol. 3 [2011], Iss. 1, Art. 4

http://commons.emich.edu/mcnair/vol3/iss1/4


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Debye

sheath

D

C2

2)) and e

D

D

Comparing Langmuir Probe Traces of Different Debye Length-to-Probe Radius Ratios

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Probe wire radius Debye lengthProbe-radius-to-

Debye-length ratio (X)Alumina outer

diameter

.07 mm .1 mm 0.7 : 11.21 mm

(.3 mm bore dia.)

.11 mm .1 mm 1.1 : 11.61 mm

(.7 mm bore dia.)

.33 mm .1 mm 3.3 : 1 1.22 mm

.83 mm .1 mm 8.3 : 1 2.6 mm

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EXPERIMENT

Torr after a

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n

VpVfTesaturation current (Ie,sat

Ii,sat


11




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a) and b)

c)

neA

probe

2ve,th

ni Mi

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Chen

Merlino

Probe

Vf

(V)

Vp

(V)

T

e

(eV

)

Ii,sat

(

A)

Ie,sat

(

A)

Rad

iu

s(mm

)

ni

(1012)

(part/m

3)

Debye

length

(mm)

X

ne

(1012)

(part/m

3

)

Debye

length

(mm)

X

1

-10

11.5

6.06

0.1

11

4.3

65

.83

46.3

0

2.6

9

0.3

09

4.2

4

8.8

8

0.0

934

2

-10.5

13.5

5.44

0.1

45

2.5

23

.33

86.9

0

1.8

6

0.1

78

6.5

2

6.7

9

0.0

486

3

-10.5

14.5

5.42

0.0

957

1.2

34

.11

152.0

0

1.4

0

0.0

78

9.4

3

5.6

3

0.0

195

4

-9

13

5.47

0.0

719

0.7

96

.07

220.0

0

1.1

7

0.0

60

9.7

9

5.5

5

0.0

126

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CONCLUSION

REFERENCES

source. Plasma Sources Science and Technology 4

Journal of Physics D: Applied

Physics, 42

Introduction to plasma physics and controlled fusion

theory. Plasma Sources Science and Technology, 18

characteristics.American Journal of Physics75

Plasma science: from fundamental research to

technological applications

Mariano Marks

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h // i h d / i / l3/i 1/4

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