Title :
Multishot pellet injection system for RFX
Author :
Baker, W. ; Garzotti, L. ; Innocente, P. ; Martini, S. ; Vitturi, S. ; Zaccaria, P. ; Bundgaard, J. ; Sass, B. ; Sørensen, H.
Author_Institution :
Gruppo di Padova per Richerche sulla Fusione, Padova Univ., Italy
fDate :
30 Sep-5 Oct 1995
Abstract :
An 8-shot injector for H and D pellets built at Riso National Laboratory has been installed on the RFX reverse field pinch. The paper presents the design and performance of the system. The specifications for pellet masses, velocities and injection angles are based on a study performed with a pellet ablation code on a set of injection scenarios in RFX. The injector produces by in-situ condensation 8 pellets with masses of 1.5+5·1020 atoms and pneumatically accelerates them with H gas at velocity of 0.5+1.5 km/s. The poloidal inclination of the injector is adjustable in a range 1.7°+12° so that the pellets can be aimed at the plasma center or up to 16 cm off-axis. Bench tests of the injector showed good agreement with the specified performance, with mass and speed reproducibility better than 10% and 3% respectively, less than 0.1% of broken pellets and a launch angle spread <5 mrad
Keywords :
fusion reactor design; fusion reactors; reversed field pinch; 2 km/s; D; D pellet; H; H gas; H pellet; RFX; eight-shot injector; multishot pellet injection system; pellet injection angle; pellet mass; pellet velocity; poloidal inclination; Acceleration; Clouds; Electrons; Laboratories; Plasma accelerators; Plasma confinement; Plasma density; Plasma measurements; Plasma temperature; Testing;
Conference_Titel :
Fusion Engineering, 1995. SOFE '95. Seeking a New Energy Era., 16th IEEE/NPSS Symposium
Conference_Location :
Champaign, IL
Print_ISBN :
0-7803-2969-4
DOI :
10.1109/FUSION.1995.534523
