Interpretation of ion cyclotron emission from sub-Alfv{acute e}nic fusion products in the Tokamak Fusion Test Reactor
- UKAEA Government Division, Fusion (Euratom/UKAEA Fusion Association), Culham, Abingdon, Oxfordshire, OX14 3DB (United Kingdom)
- JET Joint Undertaking, Abingdon, Oxfordshire, OX14 3EA (United Kingdom)
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543 (United States)
Ion cyclotron emission (ICE) has been observed during neutral beam-heated supershots in the Tokamak Fusion Test Reactor (TFTR) [Phys. Rev. Lett. {bold 72}, 3526 (1994)] deuterium{endash}tritium campaign at fusion product cyclotron harmonics. The emission originates from the outer midplane edge plasma, where fusion products initially have an anisotropic velocity distribution, sharply peaked at a sub-Alfv{acute e}nic speed. It is shown that the magnetoacoustic cyclotron instability, resulting in the generation of obliquely propagating fast Alfv{acute e}n waves at fusion product cyclotron harmonics, can occur under such conditions. The time evolution of the growth rate closely follows that of the observed ICE amplitude. Instability is suppressed if the fusion products undergo a moderate degree of thermalization, or are isotropic. In contrast, the super-Alfv{acute e}nic fusion products present in the outer midplane of the Joint European Torus (JET) [Nucl. Fusion {bold 33}, 1365 (1993)] can drive the instability if they are isotropic or have a broad speed distribution. This may help to account for the observation that fusion product-driven ICE in JET persists for longer than fusion product-driven ICE in TFTR supershots.
- Research Organization:
- Princeton Plasma Physics Laboratory
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 278487
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 2 Vol. 3; ISSN PHPAEN; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Alfvenic behavior of alpha particle driven ion cyclotron emission in TFTR
A mechanism for beam-driven excitation of ion cyclotron harmonic waves in the Tokamak Fusion Test Reactor
Evidence of coupling between toroidal Alfv{acute e}n eigenmodes and kinetic Alfv{acute e}n waves
Technical Report
·
Sat Jul 01 00:00:00 EDT 1995
·
OSTI ID:93736
A mechanism for beam-driven excitation of ion cyclotron harmonic waves in the Tokamak Fusion Test Reactor
Journal Article
·
Sat Oct 01 00:00:00 EDT 1994
· Physics of Plasmas; (United States)
·
OSTI ID:7000558
Evidence of coupling between toroidal Alfv{acute e}n eigenmodes and kinetic Alfv{acute e}n waves
Journal Article
·
Wed Jan 31 23:00:00 EST 1996
· AIP Conference Proceedings
·
OSTI ID:285263