Work Sessions of Plasma Theory 
Introduction 
progressively updated in 2019 
The Work Sessions of Plasma Theory are a series of meetings intended to help improve our understanding of various aspects of basic or applied plasma physics. A meeting is an opportunity to compare different approaches and formulations, to identify new solutions and to ellaborate references to be used as points of start in future investigations. An elementary positive effect of such Sessions should be the possible reduction of the confusion which is usually created by the wide diversity of formulations, analytical technics and/or numerical results. It would be helpful to collect a series of methods and technical treatments in a core of basic formulations, to be further used in exploration of more complex situations. At least one would know where to start from. Many important analytical treatments are now incorporated in numerical codes and this has reduced to a certain extent the interest to keep alive our ability to return, when necessary, to the first analytical description. Why would that be necessary ? It is our opinion that inside the basic approaches, developed in some cases many years ago, it is reflected the physical picture. Without this, a progress will always be difficult. Briefly characterized, the Work Sessions are a series of comments, evaluations, verifications, confrontation of possible approaches and selection of procedures. There is no intention to substitute textbooks or review articles and the periodic return to the orginal journal papers is highly recommended. In our meetings, repetitions and redundancies are not to be avoided. The texts that we place here (the links below) are amorph and incomplete. They are a simple list of problems and will be shaped through discussions. We hope that sometime they will be useful. [NOTE the links in the left column below are to PDF files, please use backarrow to return here] 

Basic theory 
Helpful reference data 
Formulas arising more frequently in applications 

Geometry and fields 
Various representations of fields 

Particle's quations of motion 
Equations of motion 

Drift kinetic equation, derivation 
Derivation 

Drift kinetic equation, solutions 
Solutions of the drift kinetic equation in some applications 

Flows of toroidal plasma 
Equilibrium flows of toroidal plasma on surfaces 

Variation on surfaces 
Effect of toroidality inducing variation of plasma parameters on surfaces 

Collisions 
Operators of collision and some applications 

Viscosity and TTMP 
Plasma viscosity and Transit Time Magnetic Pumping 

Fast ions 
Few processes involving fast ions 

Rotation 
Plasma rotation and effects on transport 

Drift waves 
The basic instability of toroidally confined plasma 

ITG and TEM 
Introductory exploration of the two main instabilities: Ion Temperature Gradient and Trapped Electron Mode 

Density and Vorticity 
Connection between Density and Vorticity (Ertel's theorem, Charney Hasegawa Mima, etc.) 

Impurities 
Few elementary facts related to impurities 

Bootstrap current 
Bootstrap current (its existence and its nonexistence) 

Polarization current 
The current of polarization and its role 

NBI 
Neutral Beam Injection, basics 

Stringer effect 
The Stringer effect and its possible role in L to H 

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