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Title: Hydrodynamic Expansion of Pellicles Caused by e-Beam Heating

Abstract

Placing a pellicle in front of a x-ray converter target for radiographic applications can confine the backstreaming ions and target plasma to a shorter channel so that the cumulative effect on e-beam focusing is reduced. The pellicle is subject to heating by e-beam since the pellicle is placed upstream of the target. The calculation of the hydrodynamic expansion, caused by the heating, using the radiation hydrodynamics code LASNEX is presented in this report. Calculations show that mylar pellicles disintegrate at the end of a multi-pulse intense e-beam while beryllium and carbon pellicles remain intact. The expansions for the kapton-carbon multi-layered targets are also examined. Hydrodynamic expansions for pellicles with various e-beam spot radii are calculated for DARHT-II beam parameters. All the simulation results indicate that the backstreaming ions can be stopped.

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Defense Programs (DP) (US)
OSTI Identifier:
792635
Report Number(s):
UCRL-ID-137358
TRN: US0301489
DOE Contract Number:  
W-7405-Eng-48
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Feb 2000
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 36 MATERIALS SCIENCE; BERYLLIUM; CARBON; FOCUSING; ELECTRON BEAMS; HEATING; HYDRODYNAMICS; MYLAR; COMPUTERIZED SIMULATION; X-RAY RADIOGRAPHY; ACCELERATOR FACILITIES; THERMAL EXPANSION

Citation Formats

Ho, D. Hydrodynamic Expansion of Pellicles Caused by e-Beam Heating. United States: N. p., 2000. Web. doi:10.2172/792635.
Ho, D. Hydrodynamic Expansion of Pellicles Caused by e-Beam Heating. United States. https://doi.org/10.2172/792635
Ho, D. Tue . "Hydrodynamic Expansion of Pellicles Caused by e-Beam Heating". United States. https://doi.org/10.2172/792635. https://www.osti.gov/servlets/purl/792635.
@article{osti_792635,
title = {Hydrodynamic Expansion of Pellicles Caused by e-Beam Heating},
author = {Ho, D},
abstractNote = {Placing a pellicle in front of a x-ray converter target for radiographic applications can confine the backstreaming ions and target plasma to a shorter channel so that the cumulative effect on e-beam focusing is reduced. The pellicle is subject to heating by e-beam since the pellicle is placed upstream of the target. The calculation of the hydrodynamic expansion, caused by the heating, using the radiation hydrodynamics code LASNEX is presented in this report. Calculations show that mylar pellicles disintegrate at the end of a multi-pulse intense e-beam while beryllium and carbon pellicles remain intact. The expansions for the kapton-carbon multi-layered targets are also examined. Hydrodynamic expansions for pellicles with various e-beam spot radii are calculated for DARHT-II beam parameters. All the simulation results indicate that the backstreaming ions can be stopped.},
doi = {10.2172/792635},
url = {https://www.osti.gov/biblio/792635}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {2}
}