Neutral beam development at the Lawrence Berkeley and Lawrence Livermore Laboratories

The Lawrence Berkeley and Livermore Laboratories Neutral Beam Development Group's work proceeds along two lines. The first is required for the near-term applications (e.g., MFTF, TFTR, and DIII), which require injection at energies up to 120 keV, ion currents per module up to 80 A, and pulse lengths greater than or equal to 0.5 s. These systems are based on the acceleration and neutralization of positive ions. The second part of the program is devoted to development for longer-term applications: positive-ion-based systems with 150 to 200-keV/65 to 100-A/10 to 30-s modules and, smewhat later, negative-ion-based systems for injection at 200 keV and higher energies