17th Technical Meeting on Energetic Particles and Theory of Plasma Instabilities in Magnetic Confinement Fusion

Session

Collective Phenomena (High Frequency Modes)

8 Dec 2021, 16:10

Virtual Event

Conveners

Collective Phenomena (High Frequency Modes)

• Tünde Fülöp (Chalmers University of Technology)

71. Characterization of ion cyclotron emission in the DIII-D tokamak

Genevieve DeGrandchamp (University of California, Irvine)

08/12/2021, 16:10

Collective Phenomena

Oral

Fast-ion losses and radiation expected in fusion reactors challenge conventional fast-ion diagnosis techniques that rely on delicate components such as scintillating plates and cameras. Passive measurement of coherent ion cyclotron emission (ICE) via magnetic pickup loops offers a robust diagnostic alternative but requires improved experimental resolution and more detailed theory. To this end,...

59. Theory for control of sub-cyclotron Alfvén instabilities and implications for anomalous electron energy transport in tokamaks

Jeff Lestz (UC Irvine)

08/12/2021, 16:40

Collective Phenomena

Oral

High frequency ($\omega <\omega_{ci}$) compressional (CAE) and global (GAE) Alfvén eigenmodes are routinely driven unstable by super-Alfvénic neutral beam ions in spherical tokamaks such as NSTX(-U) and MAST(-U). These instabilities have also been observed in the conventional tokamaks DIII-D and AUG, where the beam ions are typically sub-Alfvénic. In NSTX, the presence of strong CAE/GAE...