The existence of absolute parametric instability in an inhomogeneous plasma is revisited in a one-dimensional three-wave model.Non-resonant daughter waves are considered to match the conditions of radio-frequency(RF)-...The existence of absolute parametric instability in an inhomogeneous plasma is revisited in a one-dimensional three-wave model.Non-resonant daughter waves are considered to match the conditions of radio-frequency(RF)-plasma interactions in magnetically confined plasma.Our model shows that such absolute instability has an extremely high threshold and cannot be induced for typical RF-plasma interactions,even if the linear growth rate of the instability achieves the level of ion-cyclotron frequency.As a result,we suggest that it is appropriate to neglect absolute instability when non-resonant daughter waves are involved.展开更多
文摘The existence of absolute parametric instability in an inhomogeneous plasma is revisited in a one-dimensional three-wave model.Non-resonant daughter waves are considered to match the conditions of radio-frequency(RF)-plasma interactions in magnetically confined plasma.Our model shows that such absolute instability has an extremely high threshold and cannot be induced for typical RF-plasma interactions,even if the linear growth rate of the instability achieves the level of ion-cyclotron frequency.As a result,we suggest that it is appropriate to neglect absolute instability when non-resonant daughter waves are involved.
