dorsal/arxiv
View SchemaFaraday Cup Measurements of Ions Backstreaming into a Electron Beam Impinging on a Plasma Plume*
| Authors | G. Guethlein, T. Houck, J. McCarrick, S. Sampayan |
|---|---|
| Categories | |
| ArXiv ID | physics/0008165 |
| URL | https://arxiv.org/abs/physics/0008165 |
| Journal | eConf C000821 (2000) TUB14 |
Abstract
The next generation of radiographic machines based on induction accelerators is expected to generate multiple, small diameter x-ray spots of high intensity. Experiments to study the interaction of the electron beam with plasmas generated at the x-ray converter and at beamline septa are being performed at the Lawrence Livermore National Laboratory (LLNL) using the 6-MeV, 2-kA Experimental Test Accelerator (ETA) electron beam. The physics issues of concern can be separated into two categories. The interaction of subsequent beam pulses with the expanding plasma plume generated by earlier pulses striking the x-ray converter or a septum, and the more subtle effect involving the extraction of light ions from a plasma by the head of the beam pulse. These light ions may be due to contaminants on the surface of the beam pipe or converter, or, for subsequent pulses, in the material of the converter. The space charge depression of the beam could accelerate the light ions to velocities of several mm/ns. As the ions moved through the body of the incoming pulse, the beam would be pinched resulting in a moving focus prior to the converter and a time varying x-ray spot. Studies of the beam-generated plasma at the x-ray converter have been previously reported. In this paper we describe Faraday cup measurements performed to detect and quantify the flow of backstreaming ions as the ETA beam pulse impinges on preformed plasma. * This work was performed under the auspices of the U.S. Department of Energy by University of California Lawrence Livermore National Laboratory under contract No. W-7405-Eng-48.
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"abstract": "The next generation of radiographic machines based on induction accelerators\nis expected to generate multiple, small diameter x-ray spots of high intensity.\nExperiments to study the interaction of the electron beam with plasmas\ngenerated at the x-ray converter and at beamline septa are being performed at\nthe Lawrence Livermore National Laboratory (LLNL) using the 6-MeV, 2-kA\nExperimental Test Accelerator (ETA) electron beam. The physics issues of\nconcern can be separated into two categories. The interaction of subsequent\nbeam pulses with the expanding plasma plume generated by earlier pulses\nstriking the x-ray converter or a septum, and the more subtle effect involving\nthe extraction of light ions from a plasma by the head of the beam pulse. These\nlight ions may be due to contaminants on the surface of the beam pipe or\nconverter, or, for subsequent pulses, in the material of the converter. The\nspace charge depression of the beam could accelerate the light ions to\nvelocities of several mm/ns. As the ions moved through the body of the incoming\npulse, the beam would be pinched resulting in a moving focus prior to the\nconverter and a time varying x-ray spot. Studies of the beam-generated plasma\nat the x-ray converter have been previously reported. In this paper we describe\nFaraday cup measurements performed to detect and quantify the flow of\nbackstreaming ions as the ETA beam pulse impinges on preformed plasma.\n * This work was performed under the auspices of the U.S. Department of Energy\nby University of California Lawrence Livermore National Laboratory under\ncontract No. W-7405-Eng-48.",
"arxiv_id": "physics/0008165",
"authors": [
"G. Guethlein",
"T. Houck",
"J. McCarrick",
"S. Sampayan"
],
"categories": [
"physics.acc-ph"
],
"journal_ref": "eConf C000821 (2000) TUB14",
"title": "Faraday Cup Measurements of Ions Backstreaming into a Electron Beam Impinging on a Plasma Plume*",
"url": "https://arxiv.org/abs/physics/0008165"
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