TY - JOUR
T1 - Temperature screening and cross-field impurity accumulation from a thermodynamic perspective
AU - Kolmes, E. J.
AU - Ochs, I. E.
AU - Mlodik, M. E.
AU - Fisch, N. J.
N1 - Funding Information:
The authors thank Per Helander, whose comments prompted this investigation. This work was supported by Cornell NNSA 83228-10966 [Prime No. DOE (NNSA) DE-NA0003764 ] and by NSF PHY-1805316 .
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/9/30
Y1 - 2022/9/30
N2 - In a variety of different systems, high-Z ion species show a marked tendency to accumulate in regions of high plasma density. It has previously been suggested that the apparent universality of this behavior could be explained thermodynamically, in terms of the maximum-entropy state attainable when the system must obey an ambipolarity condition. However, the previous treatment did not allow for the possibility of temperature gradients. Here, tools from non-equilibrium (Onsager) thermodynamics are used to show that ambipolarity continues to play a key role in producing this behavior in the presence of temperature gradients, and to recover well-known temperature screening effects that appear in these cases.
AB - In a variety of different systems, high-Z ion species show a marked tendency to accumulate in regions of high plasma density. It has previously been suggested that the apparent universality of this behavior could be explained thermodynamically, in terms of the maximum-entropy state attainable when the system must obey an ambipolarity condition. However, the previous treatment did not allow for the possibility of temperature gradients. Here, tools from non-equilibrium (Onsager) thermodynamics are used to show that ambipolarity continues to play a key role in producing this behavior in the presence of temperature gradients, and to recover well-known temperature screening effects that appear in these cases.
KW - Differential transport
KW - Impurity pinch
KW - Impurity transport
KW - Non-equilibrium thermodynamics
KW - Plasma thermodynamics
KW - Temperature screening
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U2 - 10.1016/j.physleta.2022.128298
DO - 10.1016/j.physleta.2022.128298
M3 - Article
AN - SCOPUS:85134432574
SN - 0375-9601
VL - 447
JO - Physics Letters, Section A: General, Atomic and Solid State Physics
JF - Physics Letters, Section A: General, Atomic and Solid State Physics
M1 - 128298
ER -