IPAC2018 - List of Authors (Nagahashi, S.)

Paper	Title	Page
THPMF041	Low Emittance Lattice for PF-AR	4148
	N. Higashi, K. Harada, S. Nagahashi, N. Nakamura, T. Obina, R. Takai, H. Takaki KEK, Ibaraki, Japan K. Hirano Hiroshima University, Graduate School of Science, Higashi-Hiroshima, Japan
	PF-AR is a synchrotron-type 6.5 GeV light source in KEK. The user-run was started in 1987, and the lattice is almost the same as the original one. Now we consider the emittance improvement to enlarge the horizontal tune advance in the normal cell. Thanks to this manipulation, the emittance will be improved to about a half of the current value.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPMF041
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THPMF042	Beam Based Measurement of Injection Parameters at KEK-PF	4152
	K. Hirano Hiroshima University, Graduate School of Science, Higashi-Hiroshima, Japan K. Harada, N. Higashi, Y. Kobayashi, S. Nagahashi, T. Obina, R. Takai, H. Takaki, A. Ueda KEK, Ibaraki, Japan
	KEK-PF is a 2.5 GeV synchrotron radiation facility. In recent years, the injection efficiency using conventional pulsed septum and kicker magnets has decreased. The main cause of this problem seems to be the change of the injection parameters due to the accumulation of the errors including the effect of the earthquake on March 11, 2011. For the improvement of the injection efficiency, the precise and detailed parameters of the beam injection under present configuration are essential. In order to fix these parameters, we measure the response of the pulsed magnets by using injected and stored beams. In this presentation, we show the beam based measurement and the simulation results for the PF ring injection system.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPMF042
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THPMF043	Development and Present Status of Photon Factory Light Sources	4155
	T. Honda, Y. Kobayashi, S. Nagahashi, R. Takai KEK, Ibaraki, Japan
	Photon Factory of KEK manages two light sources, Photon Factory storage ring (PF-ring) and Photon Factory Advanced Ring (PF-AR) with an energy of 2.5 GeV and 6.5 GeV, respectively. Although it is unfortunate that the operation time of the accelerators is decreasing recent years due to a budget shortage and some unavoidable reconstructions, we are continuing the operation with a low failure rate and constructing a new beamline based on a novel undulator. Preparing for the start of the physics run of Super KEKB Factory, a new full energy beam transport line from the injector LINAC to PF-AR was constructed. With an installation of pulsed quadrupole magnets for the LINAC, continuous top-up injection has been established simultaneously for the four storage rings of PF and Super KEKB, and the operation of them has become compatible. As a result of increasing the injection energy of PF-AR form 3 GeV to 6.5 GeV, the beam instability during the injection disappeared, and the stability and efficiency of the injection improved significantly.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPMF043
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Low Emittance Lattice for PF-AR

4148

N. Higashi, K. Harada, S. Nagahashi, N. Nakamura, T. Obina, R. Takai, H. Takaki
KEK, Ibaraki, Japan
K. Hirano
Hiroshima University, Graduate School of Science, Higashi-Hiroshima, Japan

PF-AR is a synchrotron-type 6.5 GeV light source in KEK. The user-run was started in 1987, and the lattice is almost the same as the original one. Now we consider the emittance improvement to enlarge the horizontal tune advance in the normal cell. Thanks to this manipulation, the emittance will be improved to about a half of the current value.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPMF041

Export •

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

THPMF042

Beam Based Measurement of Injection Parameters at KEK-PF

4152

K. Hirano
Hiroshima University, Graduate School of Science, Higashi-Hiroshima, Japan
K. Harada, N. Higashi, Y. Kobayashi, S. Nagahashi, T. Obina, R. Takai, H. Takaki, A. Ueda
KEK, Ibaraki, Japan

KEK-PF is a 2.5 GeV synchrotron radiation facility. In recent years, the injection efficiency using conventional pulsed septum and kicker magnets has decreased. The main cause of this problem seems to be the change of the injection parameters due to the accumulation of the errors including the effect of the earthquake on March 11, 2011. For the improvement of the injection efficiency, the precise and detailed parameters of the beam injection under present configuration are essential. In order to fix these parameters, we measure the response of the pulsed magnets by using injected and stored beams. In this presentation, we show the beam based measurement and the simulation results for the PF ring injection system.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPMF042

Export •

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

THPMF043

Development and Present Status of Photon Factory Light Sources

4155

T. Honda, Y. Kobayashi, S. Nagahashi, R. Takai
KEK, Ibaraki, Japan

Photon Factory of KEK manages two light sources, Photon Factory storage ring (PF-ring) and Photon Factory Advanced Ring (PF-AR) with an energy of 2.5 GeV and 6.5 GeV, respectively. Although it is unfortunate that the operation time of the accelerators is decreasing recent years due to a budget shortage and some unavoidable reconstructions, we are continuing the operation with a low failure rate and constructing a new beamline based on a novel undulator. Preparing for the start of the physics run of Super KEKB Factory, a new full energy beam transport line from the injector LINAC to PF-AR was constructed. With an installation of pulsed quadrupole magnets for the LINAC, continuous top-up injection has been established simultaneously for the four storage rings of PF and Super KEKB, and the operation of them has become compatible. As a result of increasing the injection energy of PF-AR form 3 GeV to 6.5 GeV, the beam instability during the injection disappeared, and the stability and efficiency of the injection improved significantly.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPMF043

Export •

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