1998/02/01 by D. Bolshukhin, D. Meyer, Dirk C. Meyer +2
Engineering · Physics and Astronomy · #Magnetic confinement fusion research #Particle accelerators and beam dynamics #Plasma Diagnostics and Applications
paper · doi:10.1063/1.1148664
openalex publication_date 1998/02/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
By means of photodetachment we have detected negative hydrogen ions in an electron cyclotron resonance (ECR) discharge under conditions where highly charged ions are present in the plasma if hydrogen is absent. From the time delay between the laser pulse and the photodetachment (PD) signals we obtained the location of the negative ion clouds in the halo of the plasma. It coincides with the location found for atomic hydrogen ions in previous ion cyclotron resonance heating experiments. The confinement of the ions to these places must be due to the presence of local potential maxima. These maxima imply a potential dip in the core of the plasma. Furthermore, these H− ions indicate the presence of cold electrons even under conditions where high charge states are produced.