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| Title | Enhanced Orthogonal Polarization Component Treatment in COTRI Model for Microbunched Beam Diagnostics | |
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| Abstract | We present the results of modifying our coherent optical transition radiation interferometry (COTRI) model’s treatment of the perpendicular polarization of OTR, Iperp. Our previous analytic approximation for Iperp was for beam divergences, sy << 1/g, where g is the Lorentz factor and sy is the rms y-component of the beam divergence. We have replaced our analytical form with a Gaussian quadrature for the convolution of Iperp with the divergence in theta-y. This extends the range of divergences we reliably model to sy > 1/g. Ipar, the parallel polarization in the model, is unchanged. Iperp is polarized along the y-axis and is proportional to the square of the y-component of the beam’s velocity distribution. We illustrate our results with two cases: 1) beam energy E=1 GeV, OTR wavelength 633 nm, Q=235 pC, microbunching fraction, bf=1%, divergences of 0.1-0.7 mrad, and rms beam sizes 2,10, and 30 microns; 2) E=375 MeV, wavelength 266 nm, Q=300 pC, bf=10%, divergences of 0.1-0,7 mrad, and rms beam sizes of 10,25,50, and 100 microns. We will present two cases that would be of interest for the diagnostics of laser-plasma accelerator beams* and pre-bunched FELs**, respectively. | |
| Footnotes & References | * A. H. Lumpkin et al., Phys. Rev. Lett. 125, 014801 (2020). ** A. H. Lumpkin and D. W. Rule, in Proc., 39th International FEL Conference, FEL 2019 (JACoW Pub., Hamburg, Germany, 2019), pp. 408-411. |
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| Funding | Work supported by U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357. | |
| Paper | download TUPAB275.PDF [0.961 MB / 4 pages] | |
| Export | download ※ BibTeX ※ LaTeX ※ Text/Word ※ RIS ※ EndNote | |
| Conference | IPAC2021 | |
| Series | International Particle Accelerator Conference (12th) | |
| Location | Campinas, SP, Brazil | |
| Date | 24-28 May 2021 | |
| Publisher | JACoW Publishing, Geneva, Switzerland | |
| Editorial Board | Liu Lin (LNLS, Campinas, Brazil); John M. Byrd (ANL, Lemont, IL, USA); Regis Neuenschwander (LNLS, Campinas, Brazil); Renan Picoreti (LNLS, Campinas, Brazil); Volker R. W. Schaa (GSI, Darmstadt, Germany) | |
| Online ISBN | 978-3-95450-214-1 | |
| Online ISSN | 2673-5490 | |
| Received | 22 May 2021 | |
| Accepted | 10 June 2021 | |
| Issue Date | 20 August 2021 | |
| DOI | doi:10.18429/JACoW-IPAC2021-TUPAB275 | |
| Pages | 2113-2116 | |
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