dorsal/arxiv
View SchemaRF Cell Modeling and Experiments for Wakefield Minimization in DARHT-II
| Authors | Scott D. Nelson, Michael Vella |
|---|---|
| Categories | |
| ArXiv ID | physics/0008099 |
| URL | https://arxiv.org/abs/physics/0008099 |
| Journal | eConf C000821 (2000) TUB09 |
Abstract
Electron beams of linear induction accelerators experience deflective forces caused by RF fields building up as a result of accelerating cavities of finite size. These forces can significantly effect the beam when a long linac composed of identical cells is assembled. Recent techniques in computational modeling, simulation, and experiments for 20 MeV DARHT-II (Dual Axis Radiographic Hydrodynamic Test) accelerator cells were found to reduce the wakefield impedance of the cells from 800 ohms/meter to 350 ohms/meter and experimental results confirm the results of the modeling efforts. Increased performance of the cell was obtained through a parametric study of the accelerator structure, materials, material tuning, and geometry. As a result of this effort, it was found that thickness-tuned ferrite produced a 50% deduction in the wakefield impedance in the low frequency band and was easily tunable based on the material thickness. It was also found that shaped metal sections allow for high-Q resonances to be de-tuned, thus decreasing the amplitude of the resonance and increasing the cell s performance. For the geometries used for this cell, a roughly 45 degree angle had the best performance in affecting the wakefield modes.
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"abstract": "Electron beams of linear induction accelerators experience deflective forces\ncaused by RF fields building up as a result of accelerating cavities of finite\nsize. These forces can significantly effect the beam when a long linac composed\nof identical cells is assembled. Recent techniques in computational modeling,\nsimulation, and experiments for 20 MeV DARHT-II (Dual Axis Radiographic\nHydrodynamic Test) accelerator cells were found to reduce the wakefield\nimpedance of the cells from 800 ohms/meter to 350 ohms/meter and experimental\nresults confirm the results of the modeling efforts. Increased performance of\nthe cell was obtained through a parametric study of the accelerator structure,\nmaterials, material tuning, and geometry. As a result of this effort, it was\nfound that thickness-tuned ferrite produced a 50% deduction in the wakefield\nimpedance in the low frequency band and was easily tunable based on the\nmaterial thickness. It was also found that shaped metal sections allow for\nhigh-Q resonances to be de-tuned, thus decreasing the amplitude of the\nresonance and increasing the cell s performance. For the geometries used for\nthis cell, a roughly 45 degree angle had the best performance in affecting the\nwakefield modes.",
"arxiv_id": "physics/0008099",
"authors": [
"Scott D. Nelson",
"Michael Vella"
],
"categories": [
"physics.acc-ph"
],
"journal_ref": "eConf C000821 (2000) TUB09",
"title": "RF Cell Modeling and Experiments for Wakefield Minimization in DARHT-II",
"url": "https://arxiv.org/abs/physics/0008099"
},
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