Abstract
Emission from surfaces is known to cause enhanced wall heating and enhanced energy loss from plasma electrons. When E x B fields are present, emitted electrons are heated by the drift motion and cause enhanced transport along E. All emission effects are normally predicted to reach a maximum when the sheath becomes space-charge limited because any 'additional' emitted electrons return to the wall. But the returning electrons are also heated in the E x B drift, further enhancing transport, and return to the wall with extra energy, further enhancing the energy flux. Returning electrons can gain enough energy to induce secondaries, thereby self-amplifying to higher intensities. This newly analyzed mechanism could affect the wall heating, transport and global energy balance under certain conditions. Theory and simulations are presented.
| Original language | English (US) |
|---|---|
| Article number | 034010 |
| Journal | Plasma Sources Science and Technology |
| Volume | 24 |
| Issue number | 3 |
| DOIs | |
| State | Published - May 1 2015 |
| Externally published | Yes |
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Keywords
- electron emission
- sheaths
- simulation
ASJC Scopus subject areas
- Condensed Matter Physics
Cite this
Self-amplification of electrons emitted from surfaces in plasmas with E x B fields. / Campanell, M. D.; Wang, He; Kaganovich, I. D.; Khrabrov, A. V.
In: Plasma Sources Science and Technology, Vol. 24, No. 3, 034010, 01.05.2015.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Self-amplification of electrons emitted from surfaces in plasmas with E x B fields
AU - Campanell, M. D.
AU - Wang, He
AU - Kaganovich, I. D.
AU - Khrabrov, A. V.
PY - 2015/5/1
Y1 - 2015/5/1
N2 - Emission from surfaces is known to cause enhanced wall heating and enhanced energy loss from plasma electrons. When E x B fields are present, emitted electrons are heated by the drift motion and cause enhanced transport along E. All emission effects are normally predicted to reach a maximum when the sheath becomes space-charge limited because any 'additional' emitted electrons return to the wall. But the returning electrons are also heated in the E x B drift, further enhancing transport, and return to the wall with extra energy, further enhancing the energy flux. Returning electrons can gain enough energy to induce secondaries, thereby self-amplifying to higher intensities. This newly analyzed mechanism could affect the wall heating, transport and global energy balance under certain conditions. Theory and simulations are presented.
AB - Emission from surfaces is known to cause enhanced wall heating and enhanced energy loss from plasma electrons. When E x B fields are present, emitted electrons are heated by the drift motion and cause enhanced transport along E. All emission effects are normally predicted to reach a maximum when the sheath becomes space-charge limited because any 'additional' emitted electrons return to the wall. But the returning electrons are also heated in the E x B drift, further enhancing transport, and return to the wall with extra energy, further enhancing the energy flux. Returning electrons can gain enough energy to induce secondaries, thereby self-amplifying to higher intensities. This newly analyzed mechanism could affect the wall heating, transport and global energy balance under certain conditions. Theory and simulations are presented.
KW - electron emission
KW - sheaths
KW - simulation
UR - http://www.scopus.com/inward/record.url?scp=84937231744&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84937231744&partnerID=8YFLogxK
U2 - 10.1088/0963-0252/24/3/034010
DO - 10.1088/0963-0252/24/3/034010
M3 - Article
AN - SCOPUS:84937231744
VL - 24
JO - Plasma Sources Science and Technology
JF - Plasma Sources Science and Technology
SN - 0963-0252
IS - 3
M1 - 034010
ER -