Session RP1 - Poster Session VIII.
POSTER session, Thursday afternoon, October 30
Fran Hill Southeast Exhibit Hall, ACC
Collective Thomson Scattering (CTS) has been proposed as a viable diagnostic for characterizing fusion born alpha-distributions in ITER. However, the velocities of the 1MeV proton heating beam ions in ITER are similar to that of fusion born alpha particles and may therefore mask the measurements of the fusion products. To estimate the impact that beam ions may have on the CTS measurements, a fast general code is being developed for calculation of beam ion phase-space distributions in Tokamaks. For the present ITER beam injection design and magnetic geometry the code first calculates the beam deposition profile in constant of motion (COM) space. The slowing down process is then modeled taking into account the spatially non-uniform drag by the electrons and pitch angle diffusion by the ions. Our investigations show that there are CTS scattering orientations where the alpha particles will not be significantly masked by the presence of the beam ions.