Note on the Ion Beam Neutralization Problem in Three Dimensions
Title | Note on the Ion Beam Neutralization Problem in Three Dimensions PDF eBook |
Author | P. E. Kaus |
Publisher | |
Pages | 7 |
Release | 1962 |
Genre | Ion rockets |
ISBN |
Technical Publications Announcements with Indexes
Title | Technical Publications Announcements with Indexes PDF eBook |
Author | United States. National Aeronautics and Space Administration |
Publisher | |
Pages | 1556 |
Release | 1962 |
Genre | Aeronautics |
ISBN |
U.S. Government Research Reports
Title | U.S. Government Research Reports PDF eBook |
Author | |
Publisher | |
Pages | 1170 |
Release | 1962 |
Genre | Science |
ISBN |
Technical Report - Jet Propulsion Laboratory, California Institute of Technology
Title | Technical Report - Jet Propulsion Laboratory, California Institute of Technology PDF eBook |
Author | Jet Propulsion Laboratory (U.S.) |
Publisher | |
Pages | 644 |
Release | 1962 |
Genre | Astronautics |
ISBN |
Comparison of Experimental Data and 3D Simulations of Ion Beam Neutralization from the Neutralized Transport Experiment
Title | Comparison of Experimental Data and 3D Simulations of Ion Beam Neutralization from the Neutralized Transport Experiment PDF eBook |
Author | |
Publisher | |
Pages | 44 |
Release | 2004 |
Genre | |
ISBN |
The Neutralized Transport Experiment (NTX) at Lawrence Berkeley National Laboratory has been designed to study the final focus and neutralization of high perveance ion beams for applications in heavy ion fusion (HIF) and high energy density physics (HEDP) experiments. Pre-formed plasmas in the last meter before the target of the scaled experiment provide a source of electrons which neutralize the ion current and prevent the space-charge induced spreading of the beam spot. NTX physics issues are discussed and experimental data is analyzed and compared with 3D particle-in-cell simulations. Along with detailed target images, 4D phase-space data of the NTX at the entrance of the neutralization region has been acquired. This data is used to provide a more accurate beam distribution with which to initialize the simulation. Previous treatments have used various idealized beam distributions which lack the detailed features of the experimental ion beam images. Simulation results are compared with NTX experimental measurements for 250 keV K ion beams with dimensionless perveance of 1-7 x 10−4. In both simulation and experiment, the deduced beam charge neutralization is close to the predicted maximum value.
Investigation of Ion Beam Neutralization Processes With 2-D and 3-D PIC Simulations
Title | Investigation of Ion Beam Neutralization Processes With 2-D and 3-D PIC Simulations PDF eBook |
Author | |
Publisher | |
Pages | 0 |
Release | 2004 |
Genre | |
ISBN |
While it is common knowledge that ion beams are easily neutralized for both current and charge density using a variety of means, the precise process of neutralization remains unknown. With the increasing importance of electric propulsion, and in particular micropropulsion systems, this question is of significant importance. Additionally, it has bearing on thruster design, space instrument calibration, electrodynamic tethers, and ionospheric research. A review of the present state of knowledge on this topic is presented as well as results from ion beam simulations using 2D and 3D Particle-in-Cell (PlC) codes. We investigate both the early "filing" problem of the beam starting to move away from the spacecraft and the steady state problem where the beam encounters a wall at an infinite distance from the spacecraft.
Keywords Index to U.S. Government Technical Reports
Title | Keywords Index to U.S. Government Technical Reports PDF eBook |
Author | United States. Department of Commerce. Office of Technical Services |
Publisher | |
Pages | 990 |
Release | 1962 |
Genre | Government publications |
ISBN |