IPAC2015 - List of Authors (Katoh, M.)

Paper	Title	Page
TUPWA061	Analyses of Light's Orbital Angular Momentum from Helical Undulator Harmonics	1563
	S. Sasaki, A. Miyamoto HSRC, Higashi-Hiroshima, Japan M. Hosaka, N. Yamamoto Nagoya University, Nagoya, Japan M. Katoh, T. Konomi UVSOR, Okazaki, Japan
	Funding: Partially supported by the Grant-in-Aid for Scientific Research, Japan Society for the Promotion of Science, and supported by the Joint Studies Program of the Institute for Molecular Science. The phenomenon of higher harmonic radiation from a helical undulator carrying orbital angular momentum (OAM)* attracts a great deal of attention because this novel property may be used as a new probe for synchrotron radiation science that would be performed in a diffraction limited light source facility such as the APS-II. Although a diffraction limited x-ray source does not yet exist, the 750 MeV UVSOR-III is already a diffraction limited light source in the UV region. In this ring, a tandem-aligned double-APPLE undulator system similar to that in BESSY-II* is installed for FEL and coherent light source experiments. Using this set-up, we observed spiral interference patterns between two different harmonic radiations with a scanning fiber multi-channel spectrometer and a CCD camera placed at the end of BL1U Beamline. By these measurements, various interference patterns such as single, double, and triple spirals were observed which concur with the theoretical prediction for every mode in the right or left circular polarization. The rotation of an interference pattern by rotating a polarizer was also observed. * S. Sasaki and I. McNulty, Phys. Rev. Lett. 100, 124801, 2008. M. VanVeenendaal and I. McNulty, Phys. Rev. Lett. 98, 157401 (2007). * J. Bahrdt, et al., Phys. Rev. Lett. 111, 034801, 2013.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPWA061
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TUPJE004	Narrow Band Coherent Edge Radiation at UVSOR-III	1613
	M. Hosaka, O. Oodake, Y. Takashima, N. Yamamoto Nagoya University, Nagoya, Japan S. Bielawski, C. Szwaj PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France M. Katoh, T. Konomi, J. Yamazaki UVSOR, Okazaki, Japan H. Zen Kyoto University, Kyoto, Japan
	Edge radiation can be an interesting new light source because of its property that the radiation is well collimated and is radially polarized. We are developing coherent light sources in the THz region at UVSOR-III storage ring. We have already succeeded in producing a narrow band coherent THz radiation by manipulating the interaction of a relativistic electron bunch with an amplitude modulated laser with. Recently a simplified tentative beamline for detection of the edge radiation is installed at downstream of a short straight section of UVSOR-III. Coherent radiation from electron bunches after the interaction with the amplitude modulated laser is observed. Detailed measurements of polarizations and special distribution of the radiation are underway. The latest status of the study will be reported.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE004
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TUPJE005	Development of Pulsed Multipole Magnet for Aichi SR Storage Ring	1616
	K. Ito, M. Hosaka, A. Mano, T. Takano, Y. Takashima Nagoya University, Nagoya, Japan K. Hayashi, M. Katoh UVSOR, Okazaki, Japan N. Yamamoto KEK, Ibaraki, Japan
	The Aichi synchrotron radiation (Aichi SR) center is an industrial oriented synchrotron light source facility. The electron energy and circumference of the storage ring are 1.2 GeV and 72 m. The natural emittance is 53 nm-rad. Since the pulsed multipole injection scheme provides great advantages for relatively smaller SR rings, we are developing a pulsed multipole injection system for Aichi SR storage ring. In this system, it is essential to minimize the perturbation to the stored beam. To realize the required performances, we have to minimize the residual field at stored beam position, taken into account the field generated by the copper current lead of the input terminal. In addition, we carried out the analytical calculation to estimate the magnet field due to the current lead and optimized the geometrical structure of them. Construction of the multipole magnet will be completed in March 2015 and the field measurement will be carried out in April. In this presentation, we report the detail of the magnet design and the measurement results of pulsed magnetic field for the manufactured magnet. N. Yamamoto, et. al., NIM A 767, 26-33 (2014)
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE005
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TUPJE006	Recent Developments of UVSOR-III	1619
	M. Katoh, K. Hayashi, J. Yamazaki UVSOR, Okazaki, Japan M. Adachi, T. Konomi, N. Yamamoto KEK, Ibaraki, Japan M. Hosaka, Y. Takashima Nagoya University, Nagoya, Japan
	A 750 MeV low energy synchrotron light source, UVSOR, has been operational since 1983. About ten years after the first major upgrade in 2003, the second major upgrade was carried out in 2012, in which all the bending magnets were replaced with combined function ones and a new in-vacuum undulator was installed in the last straight section reserved for undulators. After this upgrade, the light source, UVSOR-III, has been operational with small emittance of 17 nm-rad, with six undulators, and fully with the top-up injection at 300mA. Adding to the present status of the accelerator, most recent progresses in the pulsed sextupole magnet for the beam injection and in the coherent light source development station will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE006
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Paper

Title

Page

Analyses of Light's Orbital Angular Momentum from Helical Undulator Harmonics

1563

S. Sasaki, A. Miyamoto
HSRC, Higashi-Hiroshima, Japan
M. Hosaka, N. Yamamoto
Nagoya University, Nagoya, Japan
M. Katoh, T. Konomi
UVSOR, Okazaki, Japan

Funding: Partially supported by the Grant-in-Aid for Scientific Research, Japan Society for the Promotion of Science, and supported by the Joint Studies Program of the Institute for Molecular Science.
The phenomenon of higher harmonic radiation from a helical undulator carrying orbital angular momentum (OAM)* attracts a great deal of attention because this novel property may be used as a new probe for synchrotron radiation science** that would be performed in a diffraction limited light source facility such as the APS-II. Although a diffraction limited x-ray source does not yet exist, the 750 MeV UVSOR-III is already a diffraction limited light source in the UV region. In this ring, a tandem-aligned double-APPLE undulator system similar to that in BESSY-II*** is installed for FEL and coherent light source experiments. Using this set-up, we observed spiral interference patterns between two different harmonic radiations with a scanning fiber multi-channel spectrometer and a CCD camera placed at the end of BL1U Beamline. By these measurements, various interference patterns such as single, double, and triple spirals were observed which concur with the theoretical prediction for every mode in the right or left circular polarization. The rotation of an interference pattern by rotating a polarizer was also observed.
* S. Sasaki and I. McNulty, Phys. Rev. Lett. 100, 124801, 2008.
** M. VanVeenendaal and I. McNulty, Phys. Rev. Lett. 98, 157401 (2007).
*** J. Bahrdt, et al., Phys. Rev. Lett. 111, 034801, 2013.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPWA061

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPJE004

Narrow Band Coherent Edge Radiation at UVSOR-III

1613

M. Hosaka, O. Oodake, Y. Takashima, N. Yamamoto
Nagoya University, Nagoya, Japan
S. Bielawski, C. Szwaj
PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France
M. Katoh, T. Konomi, J. Yamazaki
UVSOR, Okazaki, Japan
H. Zen
Kyoto University, Kyoto, Japan

Edge radiation can be an interesting new light source because of its property that the radiation is well collimated and is radially polarized. We are developing coherent light sources in the THz region at UVSOR-III storage ring. We have already succeeded in producing a narrow band coherent THz radiation by manipulating the interaction of a relativistic electron bunch with an amplitude modulated laser with. Recently a simplified tentative beamline for detection of the edge radiation is installed at downstream of a short straight section of UVSOR-III. Coherent radiation from electron bunches after the interaction with the amplitude modulated laser is observed. Detailed measurements of polarizations and special distribution of the radiation are underway. The latest status of the study will be reported.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE004

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPJE005

Development of Pulsed Multipole Magnet for Aichi SR Storage Ring

1616

K. Ito, M. Hosaka, A. Mano, T. Takano, Y. Takashima
Nagoya University, Nagoya, Japan
K. Hayashi, M. Katoh
UVSOR, Okazaki, Japan
N. Yamamoto
KEK, Ibaraki, Japan

The Aichi synchrotron radiation (Aichi SR) center is an industrial oriented synchrotron light source facility. The electron energy and circumference of the storage ring are 1.2 GeV and 72 m. The natural emittance is 53 nm-rad. Since the pulsed multipole injection scheme provides great advantages for relatively smaller SR rings*, we are developing a pulsed multipole injection system for Aichi SR storage ring. In this system, it is essential to minimize the perturbation to the stored beam. To realize the required performances, we have to minimize the residual field at stored beam position, taken into account the field generated by the copper current lead of the input terminal. In addition, we carried out the analytical calculation to estimate the magnet field due to the current lead and optimized the geometrical structure of them. Construction of the multipole magnet will be completed in March 2015 and the field measurement will be carried out in April. In this presentation, we report the detail of the magnet design and the measurement results of pulsed magnetic field for the manufactured magnet.
* N. Yamamoto, et. al., NIM A 767, 26-33 (2014)

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE005

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPJE006

Recent Developments of UVSOR-III

1619

M. Katoh, K. Hayashi, J. Yamazaki
UVSOR, Okazaki, Japan
M. Adachi, T. Konomi, N. Yamamoto
KEK, Ibaraki, Japan
M. Hosaka, Y. Takashima
Nagoya University, Nagoya, Japan

A 750 MeV low energy synchrotron light source, UVSOR, has been operational since 1983. About ten years after the first major upgrade in 2003, the second major upgrade was carried out in 2012, in which all the bending magnets were replaced with combined function ones and a new in-vacuum undulator was installed in the last straight section reserved for undulators. After this upgrade, the light source, UVSOR-III, has been operational with small emittance of 17 nm-rad, with six undulators, and fully with the top-up injection at 300mA. Adding to the present status of the accelerator, most recent progresses in the pulsed sextupole magnet for the beam injection and in the coherent light source development station will be presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE006

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)