Negative ion production with the PAGODA sourceFunded under: EAEC-FUSION 12C
This paper presents the experimental results of the PAGODA ion source, part of the SINGAP project on ion beam acceleration at Cadarache. The negative ion beam was accelerated with a three-electrode system to up to 65 keV and measured calorimetrically on a target located 3 m from the ion source. With the full extraction area (240 cm2) and with caesium seeding in the source, a total D(-) transmitted current of 1 A was obtained. By masking some parts of the plasma grid consisting of five segments, various ion extraction areas were utilised, and higher current densities were obtained from smaller extraction surfaces. With 1/5th of the extraction area (central segment), a transmitted D(-) mean current density of 10 mA/cm2 was measured at a filling pressure of 0.65 Pa with caesium seeding in the ion source, which meets the SINGAP requirements. Spectroscopic and caesium deposition measurements were also performed. The energetic electron leaks were measured and compared with the predictions of a Monte Carlo code.
Bibliographic Reference: Article: Fusion Engineering and Design, Vol. 26 (1995) pp. 463-472
Record Number: 199510620 / Last updated on: 1995-06-06
Original language: en
Available languages: en