Measurement of electron sheath thickness and collection region of electric probe using laser photodetachment signals

Details Measurement of electron sheath thickness and collection region of electric probe using laser photodetachment signals Measurement of electron sheath thickness and collection region of electric probe using laser photodetachment signals

2004-10-21

arxiv.org/abs/physics/0410187v1

Physics

Plasma Physics

12th International Congress on Plasma Physics, 25-29 October 2004, Nice (France)

Scientific paper

A new type of laser photodetachment (LPD) technique has been developed for the measurement of electron sheath thickness around an electrostatic probe and for the measurement of the length of collection region of photodetached electrons (PDE). When a thickness of the sheath formed around an electrostatic probe is thicker than about 0.1 mm, modification of the temporal evolution of the LPD signal is observed. By making use of the modification, we evaluated sheath thickness around a cylindrical probe in the existence of the magnetic field of 15 mT. It was found that the thickness of electron sheath along the magnetic field was comparable to the calculated plane-parallel Child-Langmuir sheath thickness when the probe-bias voltage was high. Furthermore, by inserting a small screening object in the laser beam channel, we can measure the sheath thickness from the modification of LPD signal. From the variation of the signal intensity as scanning the screening object perpendicular to the laser beam channel, we can observe the collection region of photodetached electrons, because this procedure changes the relative displacement between shadow and the probe electrode.

Affiliated with

Also associated with

No associations

Rating

Measurement of electron sheath thickness and collection region of electric probe using laser photodetachment signals does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Measurement of electron sheath thickness and collection region of electric probe using laser photodetachment signals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Measurement of electron sheath thickness and collection region of electric probe using laser photodetachment signals will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-228734