مشخصات پژوهش

Floating potential is one of the most important factors in the structure of plasma sheath which needs to study and investigate more. As we know when an object place (an object exist in plasma) in a plasma, electrons reach to the objects faster than the ions because of high velocity of electrons relative to the ions, hence the object or the wall has negative potential relative to the plasma. This potential as well as known floating potential and behaves as a potential barrier for electrons and prevents more electron current toward the wall and attracts more ion current. In recent years, a great deal of consideration has been paid to the nonextensive generalization of the Boltzmann-Gibbs-Shannon (BGS) entropy where it has been successfully used to explain some interesting problems in physics. Self-gravitating systems and plasma are two main candidates that use this entropy [1-3]. This entropy first recognized by Renyi[4] and then proposed by Tsallis[5]. Tsallis proposed the q-entropy as , where K_B is the Boltzmann constant, P_i is the probability of the i’th microstate and q is a parameter quantifying the degree of non-extensivity of the system. In this work, floating potential of an electrode in contact with nonextensive plasma is obtained and the effect of nonextensivity parameter on this potential is studied.