Paper |
Title |
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WEPOPT025 |
Flat Beam Generation with the Phase Space Rotation Technique at KEK-STF |
1897 |
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- M. Kuriki, Z.J. Liptak
HU/AdSM, Higashi-Hiroshima, Japan
- S. Aramoto
Hiroshima University, Higashi-Hiroshima, Japan
- H. Hayano, X.J. Jin, Y. Seimiya, N. Yamamoto, Y. Yamamoto
KEK, Ibaraki, Japan
- S. Kashiwagi
Tohoku University, Research Center for Electron Photon Science, Sendai, Japan
- K. Sakaue
The University of Tokyo, Graduate School of Engineering, Bunkyo, Japan
- M. Washio
RISE, Tokyo, Japan
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Flat beam generation from angular momentum dominated beam with a phase-space rotation technique is an unique method to manipulate the phase-space distribution of beam. As an application, the asymmetric emittance beam generation for linear colliders is considered to compensate the Beamstrahlung effect at Interaction point. By using this technique, the asymmetric beam can be generated directly with the injector, instead of radiation damping with a huge damping ring. We present the result of a proof-of-principle experiment at KEK-STF.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2022-WEPOPT025
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About • |
Received ※ 07 June 2022 — Revised ※ 14 June 2022 — Accepted ※ 15 June 2022 — Issue date ※ 23 June 2022 |
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THPOST013 |
Development of a Detection System for Quasi-Monochromatic THz Pulse by a Spatially Modulated Electron Beam |
2469 |
SUSPMF016 |
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- K. Murakoshi, Y. Koshiba, Y. Tadenuma, P. Wang, M. Washio
Waseda University, Tokyo, Japan
- R. Kuroda
AIST, Tsukuba, Japan
- K. Sakaue
The University of Tokyo, Graduate School of Engineering, Bunkyo, Japan
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We have studied the generation of the broadband THz pulse using a compact linear accelerator. The THz pulse is generated by control of an electron beam angle to Cherenkov radiation angle. In addition, we have succeeded in producing a quasi-monochromatic THz pulse by the spatially modulated electron beam by passing through a slit. This work aims to develop a detection system to elucidate the spectrum of the quasi-monochromatic THz pulse. To detect it stably in a noisy radiation environment, the stability of probe laser system for Electro Optic sampling and timing synchronization system are important. In this conference, the generation method of each THz pulses, the results of development of detection system, and future prospect will be reported.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2022-THPOST013
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About • |
Received ※ 07 June 2022 — Revised ※ 10 June 2022 — Accepted ※ 14 June 2022 — Issue date ※ 24 June 2022 |
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THPOPT029 |
Study on the Performance Improvement of Alkali Antimonide Photocathodes for Radio Frequency Electron Guns |
2640 |
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- R. Fukuoka, K. Ezawa, Y. Koshiba, M. Washio
Waseda University, Tokyo, Japan
- K. Sakaue
The University of Tokyo, Graduate School of Engineering, Bunkyo, Japan
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Semiconductor photocathodes such as Cs-Te and Cs-K-Sb are used as electron sources in accelerators to generate high brightness beams using radio frequency (rf) electron guns. Alkali antimonide photocathodes have a high quantum efficiency (Q.E.) of ~10%, and their excitation wavelength is in the visible light region (532 nm), so that they are expected to reduce the requirements on the optical system and increase the amount of charge compared to Cs-Te. However, alkali antimonide photocathodes have a short lifetime and degrade under poor vacuum conditions, so it is essential to improve durability by protective film coatings. Therefore, we are currently working on the fabrication of high Q.E. alkali antimonide photocathodes that can withstand the Q.E. reduction during coating. In this presentation, we will report the results of comparison between the fabricated alkali antimonide photocathode and Cs-Te photocathode, and future prospects.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2022-THPOPT029
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About • |
Received ※ 08 June 2022 — Revised ※ 13 June 2022 — Accepted ※ 17 June 2022 — Issue date ※ 09 July 2022 |
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THPOMS060 |
Development of Analytical Light Source for Construction of Femtosecond Pulse Radiolysis System Using Er Fiber Laser |
3109 |
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- Y. Kaneko, Y. Koshiba, K. Sakaue, M. Sato, M. Washio
Waseda University, Tokyo, Japan
- K. Sakaue
The University of Tokyo, Graduate School of Engineering, Bunkyo, Japan
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We are trying to elucidate the initial process of radiation chemical reactions, which is considered to be an unknown area. One of the methods to elucidate this initial process is pulse radiolysis. In pulse radiolysis, a substance is irradiated with ionizing radiation and at the same time irradiated with analytical light, and the absorption spectrum of the light can be traced back in time to the active species. However, the radiation chemical reaction starts in a very short time, and the pulse radiolysis system needs to have the same time resolution. Therefore, the analytical light should be ultra-short pulses. In addition, the absorption wavelength of the substance is not always known. Hence, the wavelength range of the analytical light should be broad. Since the absorption wavelengths of important active species are in the visible light region, it is desirable to cover the visible light region as well. We believe that supercontinuum light generated from the second harmonic of the Er fiber laser is the best analytical light to meet these requirements. In this presentation, we describe the current status of the development of the supercontinuum light generation and future prospects.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2022-THPOMS060
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About • |
Received ※ 07 June 2022 — Revised ※ 12 June 2022 — Accepted ※ 13 June 2022 — Issue date ※ 28 June 2022 |
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