Measuring Ion Temperature in Plasma: Why Use Tungsten/Molybdenum Probes?

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SUMMARY

The discussion centers on the challenges of measuring ion temperature in plasma using a single probe method and the advantages of tungsten and molybdenum probes. These materials are favored due to their refractory properties, which include high melting temperatures and high sputtering thresholds, making them suitable for high-temperature plasma applications. The conversation references several academic papers that provide insights into the effectiveness of these materials in plasma diagnostics.

PREREQUISITES
  • Understanding of plasma physics concepts
  • Familiarity with Langmuir probe diagnostics
  • Knowledge of refractory materials and their properties
  • Basic grasp of temperature measurement techniques in plasma
NEXT STEPS
  • Research the properties of refractory metals in high-temperature applications
  • Explore the use of Langmuir probes for measuring electron and ion temperatures
  • Study the sputtering thresholds of various materials in plasma environments
  • Investigate advanced plasma diagnostics techniques beyond single probe methods
USEFUL FOR

Researchers in plasma physics, engineers working with plasma diagnostics, and materials scientists focused on high-temperature applications will benefit from this discussion.

mkbh_10
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I am nt able to understand why we are not able to measure ion temperature in plasma using single probe method ?

Why tungsten or molybednum probes are used ?
The book says due to their refractory properties but i am nt getting it .



TO mod , i didnt find a plasma related section so posted this here so please move it if there is one .
 
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Unfortunately we don't have a plasma physics forum, so other than HEP, one could probably post in Gen Phys or Classical Physics.

What type of plasma?

Here are some papers that might be of interest.

http://www.ktu.lt/lt/mokslas/zurnalai/medz/medz0-91/16%20Testing...(pp.346-350).pdf

http://epsppd.epfl.ch/Hersonissos/pdf/P2_142.pdf

http://www.terrapub.co.jp/journals/EPS/pdf/5112/51121309.pdf

http://depts.washington.edu/rppl/presentations/APS2009/2009-APS-poster-24.pdf

In the last reference (poster), look at Table 2. A Comparison of Material Sputtering Threshold, and note the ranking of W, Ta, and Mo compared to other materials. The refractory metals have high melting temperature and high sputtering threshold, so they are ideal for certain high temperature applications.

I believe a single Langmuir probe can be used for temperature measurement - at least electron temperature - but perhaps ion temperature is of interest.

http://www-ferp.ucsd.edu/boedo/Diagnostics/Te_Fluctuations/Rudakov_htpd_00.pdf
 
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