Paper |
Title |
Other Keywords |
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MOPO076 |
Study on Generation of Variable Polarized Coherent THz Radiation Using a Crossed Undulator |
undulator, radiation, electron, controls |
157 |
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- H. Saito, H. Hama, F. Hinode, K. Kanomata, S. Kashiwagi, S. Miura, T. Muto, I. Nagasawa, K. Nanbu, S. Ninomiya, K. Takahashi
Tohoku University, Research Center for Electron Photon Science, Sendai, Japan
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A variable polarized THz radiation source using a crossed undulator system has been developed at Tohoku University. In this scheme, two coherent undulator radiations from an extremely short electron bunch are used to control the polarization. They are linearly polarized radiations orthogonal to each other. Polarization of superimposed radiation is controlled by adjusting a relative phase between them. A compact planar undulator with seven periods has been designed for an experiment at our facility. The radiation frequency is 2.06 THz for electron beam energy of 22 MeV. The opening angle of the crossed undulator radiation was estimated to be 34 mrad (FWHM). Since the polarization state of the crossed undulator depends on observation angle, its angular dependence was evaluated. It was found that ideal polarization control is realized only in the angle range of 2.5 mrad, which is quite smaller than that of the radiation itself.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO076
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About • |
paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019 |
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TUPO091 |
Beam Break Up Instability Analysis for Cavities, Linacs and Energy Recovery Linacs |
dipole, cavity, linac, focusing |
537 |
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- V. Volkov, V.M. Petrov
BINP SB RAS, Novosibirsk, Russia
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This analyze argue that BBU instability both in separate cavities and in Linacs or ERLs is going due to the consequence of fundamental property of dipole modes. ’Head-tail’ bunch instability has also the same nature. New BBU instability testing methods are described and analytically proved in the article.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO091
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About • |
paper received ※ 14 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019 |
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THPO115 |
Consolidation and Extension of the High-gradient LINAC RF Technology at PSI |
FEL, linac, accelerating-gradient, cavity |
937 |
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- P. Craievich, M. Bopp, H.-H. Braun, A. Citterio, H. Fitze, T. Garvey, T. Kleeb, F. Löhl, F. Marcellini, M. Pedrozzi, J.-Y. Raguin, L. Rivkin, K. Rolli, R. Zennaro
PSI, Villigen PSI, Switzerland
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For SwissFEL a novel production process for high-gradient, high-precision C-band accelerating structures had been developed at PSI and was implemented for series production in collaboration with industry. The copper parts of the structures are machined and brazed relying on a ultra-high precision manufacturing process and tight mechanical tolerances; no RF tuning methods are applied during or after production. So far none of the structures of the series production failed during RF power conditioning and operation in the SwissFEL facility. After completing the series production for SwissFEL PSI started collaborations with CERN, ELETTRA and DESY for applying the production process and related know-how to other frequencies, namely S-band (3 GHz) and X-band (12 GHz). This paper gives an overview on the ongoing and planned R\&D activities and results obtained so far.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-LINAC2018-THPO115
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About • |
paper received ※ 11 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019 |
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