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We have commenced experiments with intense short pulses of ion beams on theNeutralized Drift Compression Experiment (NDCX-II) at Lawrence BerkeleyNational Laboratory, with 1-mm beam spot size within 2.5 ns full-width at halfmaximum. The ion kinetic energy is 1.2 MeV. To enable the short pulse durationand mm-scale focal spot radius, the beam is neutralized in a 1.5-meter-longdrift compression section following the last accelerator cell. Ashort-focal-length solenoid focuses the beam in the presence of the volumetricplasma that is near the target. In the accelerator, the line-charge densityincreases due to the velocity ramp imparted on the beam bunch. The scientifictopics to be explored are warm dense matter, the dynamics of radiation damagein materials, and intense beam and beam-plasma physics including select topicsof relevance to the development of heavy-ion drivers for inertial fusionenergy. Below the transition to melting, the short beam pulses offer anopportunity to study the multi-scale dynamics of radiation-induced damage inmaterials with pump-probe experiments, and to stabilize novel metastable phasesof materials when short-pulse heating is followed by rapid quenching. Firstexperiments used a lithium ion source; a new plasma-based helium ion sourceshows much greater charge delivered to the target.

Short-Pulse, Compressed Ion Beams at the Neutralized Drift Compression Experiment