| Popis: |
In this paper, we will present the initial results of our experiments designed to characterize an RF‐driven, multicusp, negative‐ion source. We will describe our experiences with suppression of RF pickup in the control system signal lines. Next, the characteristics of the extracted negative‐ion beam will be described and compared with that from filament‐based sources. The beam current, electron‐to‐ion ratio, and emittance as a function of RF power will be shown. Trends will also be shown with various electron suppression collar geometries and filter‐rod field strengths. Finally, we will describe the change in beam current obtained when Cs is introduced into the plasma chamber using heated SAES dispensers. |
