Loss of alpha-like MeV fusion products from TFTR

Abstract

A detailed comparison between the observed and expected loss of alpha-like MeV fusion products in TFTR is presented. The D-D fusion products (mainly the 1 MeV triton) were measured with an 2-D imaging scintillation detector. The expected first-orbit loss was calculated with a simple Lorentz orbit code. In almost all cases the measured loss was consistent with the expected first-orbit loss model. Exceptions are noted for small major radius plasmas and during strong MHD activity.

Fast-Ion Losses due to Externally Applied Static Magnetic Perturbations in the Large Helical Device

“…Figures 3 (a) and 3 (b) show the scintillation images captured by the CMOS camera of SLIP at 4.50 s in shot number 102960 and 4.50 s in shot number 102963, respectively. The E and χ grids were calculated using the numerical grid map calculation code [14]. In both figures, a bright spot occurs around E/χ of 20-180 keV/50…”

Energetic ion loss detector on the Alcator C-Mod tokamak

“…This is calculated by the NLSDET-SIM (Ref. 29) code, which traces helical trajectories based on the geometry of the probe head and the local magnetic field. For each gyroradius/pitch angle pair, the code begins the orbit from a variable position within the volume defined to represent the aperture.…”

Energetic ion loss diagnostic for the Wendelstein 7-AS stellarator

“…3. The design follows the concept used for an alpha particle loss diagnostic in TFTR [3,4]. The probe is located outside the plasma, and between fully parallel and fully perpendicular to the local magnetic field; (2) the rear aperture is wide compared to the front; and (3) the exterior of the probe is shaped to minimize interception of the ion orbits entering the detector.…”