Electron Accelerators and Applications
Synchrotron light sources
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MOPOJO18 Manipulation and Measurement of Polarization State for THz Coherent Undulator Radiation 69
  • S. Kashiwagi, H. Hama, F. Hinode, T. Muto, I. Nagasawa, K. Nanbu, H. Saito
    Tohoku University, Research Center for Electron Photon Science, Sendai, Japan
  • A. Irizawa
    ISIR, Osaka, Japan
  • H. Zen
    Kyoto University, Kyoto, Japan
  We are developing an accelerator-based terahertz source that can produce arbitrary polarization states from linearly polarized coherent undulator radiation (CUR). The polarization manipulation of the CUR can be realized using the Martin’Puplett interferometer employed as an optical phase shifter. This study also demonstrates a variable polarization manipulator by using the terahertz CUR (THz-CUR) source based on an extremely short electron bunch at Research Center for Electron Photon Science (ELPH), Tohoku University. The horizontally polarized CUR with a frequency of 1.9 THz was manipulated into variable polarization state, and Stokes parameters were measured to derive the degree of polarization. Beam experimental results will be presented in this conference.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOJO18  
About • Received ※ 09 September 2022 — Revised ※ 18 September 2022 — Accepted ※ 21 September 2022 — Issue date ※ 12 October 2022
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MOPOJO19 Programmable SLED System for Single Bunch and Multibunch Linac Operation 73
  • C. Christou, P. Gu, A. Tropp
    DLS, Oxfordshire, United Kingdom
  The Diamond Light Source pre-injector linac generates single bunch and multibunch 100 MeV electron beams for top-up and fill of the storage ring. The linac is powered by two high-power 3 GHz klystrons, and both klystrons are required for reliable injection into the booster and storage ring. In order to introduce redundancy, a SLED pulse compression cavity has been installed so that the linac can operate from just one klystron, with the second klystron held as a standby. A simple phase flip can be used to generate a high-power transient RF spike, suitable for single bunch linac operation, and a programmable amplitude and phase drive profile can be specified to generate a constant-power klystron output suitable for multibunch operation. Details are presented of design, installation and high-power operation of the SLED system, and the ability to generate a long pulse, including corrections for klystron nonlinearity and deviations from modulator flat-top, is demonstrated.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOJO19  
About • Received ※ 09 August 2022 — Revised ※ 29 August 2022 — Accepted ※ 02 September 2022 — Issue date ※ 08 September 2022
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