Eisenberg David Langmuir Probe

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Information about Eisenberg David Langmuir Probe

Published on January 3, 2008

Author: luie

Source: authorstream.com

David Eisenberg:  David Eisenberg Construction and Application Langmuir Probe For Irvine Torus Irvine Torus:  Irvine Torus R=0.56m, a=0.035m 0 < Bo < 0.25 T 1015 < nion< 1018 m-3 5 < Te < 15 eV 0.1 < Tion < 2 eV Argon 3T 17T Diffusion Pump Magnetic Coils Main Vessel Langmuir Probe:  Langmuir Probe The Langmuir probe is useful for providing measurements of electron density, temperature and ion density. In essence, the Langmuir probe is nothing more than a sphere, cylinder or in this case disc made out of a conducting substance inserted into a plasma. As the charged plasma particles collide with the disc, it draws electrical current. Theory:  Theory No Applied Voltage Negative Potential Lighter Electrons have greater velocity Applied Voltage Decreasing Voltage repels electrons Only Electrons with enough velocity to over come potential barrier collide with probe Construction 2-steps:  Construction 2-steps Probe Shaft Stainless Steel Body Teflon Plug 2 Metal Caps Copper Wire Glass Tubing SMA Co-ax Connector Probe Tip Tungsten Wire Glass insulation Aluminum covering Ceramic Casing Protects from plasma heat Molybdenum Tip Disc that actually draws current Probe Details:  Probe Details Entire Probe -Length: 66.5 cm Tip -Diameter: 0.130 cm Schematic:  Schematic Teflon Plug Cap A Cap B Tip Stretched Glass Aluminum Tubing Tungsten Wire Data Acquisition:  Data Acquisition I-V Trace:  I-V Trace 1) Ion Saturation Current Positive contributions from Ions 2) Floating Potential No applied Potential Potential any object will obtain undisturbed in Plasma 3) Space Potential Potential of Plasma 2 1 3 Electron Temperature:  Electron Temperature Density :  Density Normalized from I-V trace Floating Potential:  Floating Potential In the Future:  In the Future Add data to my results Much more at 17T Run experiments with Helium rather than Argon Use probe to help with diffusion experiment Sources Chen, Francis Plasma Physics and Controlled Fusion, Plenum Press, NY 1984 Chan, Lisa “Langmuir Probe Cronstruction” Thanks to Prof. McWilliams, Dr. Edrich, Scott Catanzariti and the rest of the Lab crew that helped with this project.

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