dorsal/arxiv
View SchemaInterference of diffraction and transition radiation and its application as a beam divergence diagnostic
| Authors | R. B. Fiorito, A. G. Shkvarunets, T. Watanabe, V. Yakimenko, D. Snyder |
|---|---|
| Categories | |
| ArXiv ID | physics/0605110 |
| URL | https://arxiv.org/abs/physics/0605110 |
| DOI | 10.1103/PhysRevSTAB.9.052802 |
Abstract
We have observed the interference of optical diffraction radiation (ODR) and optical transition radiation (OTR) produced by the interaction of a relativistic electron beam with a micromesh foil and a mirror. The production of forward directed ODR from electrons passing through the holes and wires of the mesh and their separate interactions with backward OTR from the mirror are analyzed with the help of a simulation code. By careful choice of the micromesh properties, mesh-mirror spacing, observation wavelength and filter band pass, the interference of the ODR produced from the unperturbed electrons passing through the open spaces of the mesh and OTR from the mirror are observable above a broad incoherent background from interaction of the heavily scattered electrons passing through the mesh wires. These interferences (ODTRI) are sensitive to the beam divergence and can be used to directly diagnose this parameter. We compare experimental divergence values obtained using ODTRI, conventional OTRI, for the case when front foil scattering is negligible, and computed values obtained from transport code calculations and multiple screen beam size measurements. We obtain good agreement in all cases.
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"abstract": "We have observed the interference of optical diffraction radiation (ODR) and\noptical transition radiation (OTR) produced by the interaction of a\nrelativistic electron beam with a micromesh foil and a mirror. The production\nof forward directed ODR from electrons passing through the holes and wires of\nthe mesh and their separate interactions with backward OTR from the mirror are\nanalyzed with the help of a simulation code. By careful choice of the micromesh\nproperties, mesh-mirror spacing, observation wavelength and filter band pass,\nthe interference of the ODR produced from the unperturbed electrons passing\nthrough the open spaces of the mesh and OTR from the mirror are observable\nabove a broad incoherent background from interaction of the heavily scattered\nelectrons passing through the mesh wires. These interferences (ODTRI) are\nsensitive to the beam divergence and can be used to directly diagnose this\nparameter. We compare experimental divergence values obtained using ODTRI,\nconventional OTRI, for the case when front foil scattering is negligible, and\ncomputed values obtained from transport code calculations and multiple screen\nbeam size measurements. We obtain good agreement in all cases.",
"arxiv_id": "physics/0605110",
"authors": [
"R. B. Fiorito",
"A. G. Shkvarunets",
"T. Watanabe",
"V. Yakimenko",
"D. Snyder"
],
"categories": [
"physics.acc-ph"
],
"doi": "10.1103/PhysRevSTAB.9.052802",
"title": "Interference of diffraction and transition radiation and its application as a beam divergence diagnostic",
"url": "https://arxiv.org/abs/physics/0605110"
},
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