Plasma diagnostic by probes: study aid

Description

Scientific basis of low-temperature plasma probe diagnostics is described in the textbook. Overview of probe methods of plasma diagnostics and a wide range of issues in their practical use is shown. Theoretical study of these methods, detailed description of the design features and the necessary formulas are given. Estimates of possible errors are made, a variety of tests are described. Using the Langmuir probe allows to obtain reliable data on the concentration of free electrons with high spatial and temporal resolution and to obtain estimates of the ratio of the concentrations of negative ions and free electrons in the plasma. Designed for students studying in the direction 140800 «Nuclear physics and technology». FOREWORD 1. INTRODUCTION 1.1. Probe shapes and probe types 1.2. Measuring the probe characteristic 1.3. Probe characteristic and its interpretation 1.4. The working regimes of the Langmuir probe 1.5. Advantages and disadvantages of the Langmuir probe diagnostics method 2. THE LANGMUIR SINGLE PROBE METHOD 2.1. Theoretical foundations of the Langmuir probe method 2.2. Probe characteristic ‒ example of the spherical probe 2.2.1. Probe current at q(Up ( 0 2.2.2. Probe current at q(Up ( 0 3. GENERAL THEORIES OF THE CURRENT TO A LANGMUIR PROBE 3.1. Starting system of equations 3.2. The «cold ion» model by Allen, Boyd and Reynolds (Ti / Tk ( 0, spherical probe) 4. THE DRUYVESTEYN METHOD FOR ESTIMATION OF THE ELECTRON ENERGY DISTRIBUTION FUNCTION (EEDF) 5. PROBE DIAGNOSTICS OF ANISOTROPIC PLASMAS 6. LANGMUIR PROBE IN THE NON COLLISION-FREE CONDITIONS (TRANSITION REGIME OF PRESSURES) 7. LANGMUIR PROBE IN A MAGNETISED PLASMA 8. SPACE AND TIME RESOLVED LANGMUIR PROBE METHOD 8.1. Space resolved Langmuir probe measurements 8.2. Time resolved Langmuir probe measurements 8.2.1. Time resolved probe measurements in periodically changing plasmas at (