Abstract
An analytic model is developed for understanding the abrupt onset of geodesic acoustic mode (GAM) in the presence of chirping energetic-particle-driven GAM (EGAM). This abrupt excitation phenomenon has been observed on LHD plasma. Threshold conditions for the onset of abrupt growth of GAM are derived, and the period doubling phenomenon is explained. The phase relation between the mother mode (EGAM) and the daughter mode (GAM) is also discussed. This result contributes to the understanding of “trigger problems” of laboratory and nature plasmas.
| Original language | English |
|---|---|
| Pages (from-to) | 418-423 |
| Number of pages | 6 |
| Journal | Plasma Physics Reports |
| Volume | 42 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - May 1 2016 |
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All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Physics and Astronomy (miscellaneous)
Cite this
Onset condition of the subcritical geodesic acoustic mode instability in the presence of energetic-particle-driven geodesic acoustic mode. / Itoh, K.; Itoh, Sanae; Kosuga, Y.; Lesur, M.; Ido, T.
In: Plasma Physics Reports, Vol. 42, No. 5, 01.05.2016, p. 418-423.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Onset condition of the subcritical geodesic acoustic mode instability in the presence of energetic-particle-driven geodesic acoustic mode
AU - Itoh, K.
AU - Itoh, Sanae
AU - Kosuga, Y.
AU - Lesur, M.
AU - Ido, T.
PY - 2016/5/1
Y1 - 2016/5/1
N2 - An analytic model is developed for understanding the abrupt onset of geodesic acoustic mode (GAM) in the presence of chirping energetic-particle-driven GAM (EGAM). This abrupt excitation phenomenon has been observed on LHD plasma. Threshold conditions for the onset of abrupt growth of GAM are derived, and the period doubling phenomenon is explained. The phase relation between the mother mode (EGAM) and the daughter mode (GAM) is also discussed. This result contributes to the understanding of “trigger problems” of laboratory and nature plasmas.
AB - An analytic model is developed for understanding the abrupt onset of geodesic acoustic mode (GAM) in the presence of chirping energetic-particle-driven GAM (EGAM). This abrupt excitation phenomenon has been observed on LHD plasma. Threshold conditions for the onset of abrupt growth of GAM are derived, and the period doubling phenomenon is explained. The phase relation between the mother mode (EGAM) and the daughter mode (GAM) is also discussed. This result contributes to the understanding of “trigger problems” of laboratory and nature plasmas.
UR - http://www.scopus.com/inward/record.url?scp=84975690667&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84975690667&partnerID=8YFLogxK
U2 - 10.1134/S1063780X16050056
DO - 10.1134/S1063780X16050056
M3 - Article
AN - SCOPUS:84975690667
VL - 42
SP - 418
EP - 423
JO - Plasma Physics Reports
JF - Plasma Physics Reports
SN - 1063-780X
IS - 5
ER -