The charged-particle dynamics in a 20-TW ion diode are determined from Stark-shift measurements of the accelerating electric field. The -10-MV/cm peak field is an order of magnitude higher than any previous laboratory Stark-shift measurement.The data supply evidence for a field-limited ion source, a zero net-charge region near the anode, a positive net-charge region in the middle of the acceleration gap, and azimuthal asymmetries. Comparisons with QUICKSILVER computer simulations provide new capabilities to evaluate the inhuence of charged-particle dynamics on ion-beam divergence and power.PACS numbers: 52.75.Pv, 32.60.+i, 52.25.Rv, 52.70.Ds Pulsed-power applied-B ion diodes are a promising candidate driver for inertial confinement fusion (ICF) [1].High-purity -10-MeV lithium beams have been focused
Plasma plumes produced by laser ablation are an established method for manufacturing the high quality stoichiometrically complex thin films used for a variety of optical, photoelectric, and superconducting applications. The state and reproducibility of the plasma close to the surface of the irradiated target plays a critical role in producing high quality thin films. Unfortunately, this dense plasma has historically eluded quantifiable characterization. The difficulty in modeling the plume formation arises in the accounting for the small amount of energy deposited into the target when physical properties of these exotic target materials are not known. In this work we obtain the high density state of the plasma plume through the use of an experimental spectroscopic technique and a custom spectroscopic model. In addition to obtaining detailed temperature and density profiles, issues regarding line broadening and opacity for spectroscopic characterization will be addressed for this unique environment.
Magnetically insulated ion diodes are being developed to drive inertial confinement fusion. Ion beam microdivergence must be reduced to achieve the very high beam intensities required to achieve this goal. Three-dimensional particle-in-cell simulations [Phys. Rev. Lett. 67, 3094, (1991)l indicate that instability induced fluctuations can produce significant ion divergence during acceleration. These simulations exhibit a fast growing mode early in time, which has been identified as the diocotron instability.The divergence generated by this mode is modest due to the relatively high frequency This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsiprocess disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the UnitedStates Government or any agency thereof. ,
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