Title :
Development of high current surface ionization sources for heavy ion fusion
Author :
Kwan, J.W. ; Bienionsek, F.M. ; Chacon-Golcher, E. ; Baca, D.
Author_Institution :
LBNL, Berkeley, CA, USA
Abstract :
Due to their intrinsic low ion temperature, surface ionization sources with a moderate to high current density (J~10-100 mA/cm2 ) may meet the beam brightness requirement for Heavy Ion Fusion (HIF) injectors, for both, the large source and multiple-beamlet designs. However, alkali metals released by these sources can contaminate and degrade high voltage insulators, thus making neutral atom loss an important issue. We present experimental results of average emitted J´s and lifetime performance of K+ and Cs+ surface ionization sources and K-aluminosilicate sources operating in pulsed modes (2-10 μs). Fabrication of large (~10 cm diameter) aluminosilicate sources is challenging given the surface quality required. Current work in this aspect is presented
Keywords :
ion accelerators; ion sources; particle beam fusion accelerators; particle beam injection; plasma inertial confinement; surface ionisation; 10 cm; 2 to 10 mus; Cs; Cs+; K; K+; alkali metals; aluminosilicate sources; heavy ion fusion; high current surface ionization sources; high voltage insulators; inertial confinement fusion; injectors; lifetime performance; multiple-beamlet designs; pulsed modes; Brightness; Current density; Degradation; Fabrication; Insulation; Ionization; Metal-insulator structures; Surface contamination; Temperature; Voltage;
Conference_Titel :
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-7191-7
DOI :
10.1109/PAC.2001.987290
