Alpha particle diagnostic based on damping of lower hybrid waves

Journal Article · Wed May 01 04:00:00 EDT 1985 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1138227· OSTI ID:5639415

Wong, K

The feasibility of using lower-hybrid wave damping measurement as a diagnostic for energetic (above 200 keV) alpha particles has been investigated for large tokamaks like TFTR and FED devices. Detailed ray tracing calculations show that slow lower-hybrid waves can be used for TFTR, but the fast lower-hybrid wave is necessary for wave penetration into the dense plasma core of FED. It is possible to launch waves mainly damped on the energetic alpha particles whose velocity distribution function f/sub proportional/(r,v,t) is related to the wave damping rate. A 1% energetic alpha-particle concentration would cause substantial wave damping measurable by FIR laser scattering systems. Preliminary estimates show that this technique should yield good temporal resolution (approx.1 ms) and some spatial resolution for the alpha-particle distribution function. However, extensive computation is necessary to unfold the velocity dependence if it is at all possible.

• Research Organization: Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08544
• OSTI ID: 5639415
• Journal Information: Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 56:5; ISSN RSINA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
ALPHA DETECTION
ALPHA PARTICLES
CHARGED PARTICLE DETECTION
CHARGED PARTICLES
DAMPING
DETECTION
ELECTROMAGNETIC RADIATION
ENERGY RANGE
FEASIBILITY STUDIES
KEV RANGE
KEV RANGE 100-1000
PLASMA DIAGNOSTICS
PLASMA WAVES
RADIATION DETECTION
RADIATIONS
RESOLUTION
SPATIAL RESOLUTION
TFTR REACTORS
WAVE PROPAGATION