Research output: Contribution to journal › Article › peer-review
Anomalously high near-wall sheath potential drop in a plasma with nonlocal fast electrons. / Demidov, V. I.; Dejoseph, C. A.; Kudryavtsev, A. A.
In: Physical Review Letters, Vol. 95, No. 21, 215002, 18.11.2005.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Anomalously high near-wall sheath potential drop in a plasma with nonlocal fast electrons
AU - Demidov, V. I.
AU - Dejoseph, C. A.
AU - Kudryavtsev, A. A.
PY - 2005/11/18
Y1 - 2005/11/18
N2 - It is demonstrated for the first time that the presence of a small number of fast, nonlocal electrons can dramatically change the thickness of and electric field in the near-wall sheath. Even if the density of the nonlocal fast group, nf, is much less than the density of the bulk electrons, nb (nf∼10-5nb), the near-wall potential can increase dramatically resulting in a comparable increase in the sheath thickness. Because of this low fractional density, the average energy (electron temperature Te) of all electrons is little changed from that of the bulk, yet the near-wall potential drop can increase to tens of Te/e. More importantly, due to the nonlocal nature of this group of electrons, the near-wall sheath potential is found to be independent of Te and is determined only by the energy of the fast group.
AB - It is demonstrated for the first time that the presence of a small number of fast, nonlocal electrons can dramatically change the thickness of and electric field in the near-wall sheath. Even if the density of the nonlocal fast group, nf, is much less than the density of the bulk electrons, nb (nf∼10-5nb), the near-wall potential can increase dramatically resulting in a comparable increase in the sheath thickness. Because of this low fractional density, the average energy (electron temperature Te) of all electrons is little changed from that of the bulk, yet the near-wall potential drop can increase to tens of Te/e. More importantly, due to the nonlocal nature of this group of electrons, the near-wall sheath potential is found to be independent of Te and is determined only by the energy of the fast group.
UR - http://www.scopus.com/inward/record.url?scp=28844459324&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.95.215002
DO - 10.1103/PhysRevLett.95.215002
M3 - Article
AN - SCOPUS:28844459324
VL - 95
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 21
M1 - 215002
ER -
ID: 52198529