Capped probe for ion temperature diagnostic in a magnetized plasma

• DOI: 10.1063/1.1694637
• Publication Date: 2004-02-17T21:36:17Z
• Authors: Masumi Sato
• Keywords: Electron temperature; Ion current; Saturation current; Langmuir Probe; Torr; Saturation (graph theory)

A simple ion temperature measurement method in a magnetic field using an electrostatic capped probe is presented and tested. The with the axis oriented parallel small cylinder whose flat tip insulated cap to inhibit electron inflow field. collector current, essentially less affected, becomes comparable or larger than saturation usual retarding potential technique can be used measure temperature. Measurements were made diffused helium plasma density 1010 ∼ 1013 cm−3 at gas pressure ∼mTorr 0.8 3.5 kG. Ion temperatures obtained are 2 eV, which nearly equal temperatures, compared data from Doppler profile measurements. Availabilities of limiting conditions for determination also discussed.