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

Volume

2

fYear

1995

fDate

30 Sep-5 Oct 1995

Firstpage

1570

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/FUSION.1995.534523

Filename

534523