Y. Okayasu
YOU?
Author Swipe
View article: Modification of Beam Transport Line Design for Simultaneous Top-up Injection to PF and PF-AR
Modification of Beam Transport Line Design for Simultaneous Top-up Injection to PF and PF-AR Open
The High Energy Accelerator Research Organization (KEK) has two light sources: Photon Factory (PF, 2.5 GeV) and Photon Factory Advanced Ring (PF-AR, 6.5 GeV). In 2017, the operation of a new beam transport line (BT) of PF-AR was started, a…
View article: Control survey and analysis for the KEK e−/e+ injector linac
Control survey and analysis for the KEK e−/e+ injector linac Open
A control survey technique using a laser tracker and a digital level was introduced to the KEK e−/e+ injector linac in 2020. Control surveys are continuously demonstrated during the machine’s downtimes every summer. Analysis of the two-yea…
View article: Achievement of 200,000 hours of operation at KEK 7-GeV electron 4-GeV positron injector linac
Achievement of 200,000 hours of operation at KEK 7-GeV electron 4-GeV positron injector linac Open
KEK electron positron injector LINAC initiated the injection operation into Photon Factory (PF) light source in 1982. Since then for 39 years, it has served for multiple projects, namely, TRISTAN, PF-AR, KEKB, and SuperKEKB. Its total oper…
View article: Achievement of 200,000 hours of operation at KEK 7-GeV electron 4-GeV positron injector linac
Achievement of 200,000 hours of operation at KEK 7-GeV electron 4-GeV positron injector linac Open
KEK electron positron injector LINAC initiated the injection operation into Photon Factory (PF) light source in 1982. Since then for 39 years, it has served for multiple projects, namely, TRISTAN, PF-AR, KEKB, and SuperKEKB. Its total oper…
View article: An interpretation of SPring-8 ground elevation by the empirical ATL-law approach
An interpretation of SPring-8 ground elevation by the empirical ATL-law approach Open
Starting in 1996, the coordinates of the accelerator components on the SPring-8 storage ring were continuously surveyed for over two decades. The dispersion of the elevation changes of the ground motion ⟨ dz 2 ⟩ analyzed from the aspect of…
View article: Unique Access to <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>u</mml:mi></mml:math>-Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction
Unique Access to -Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction Open
Backward-angle meson electroproduction above the resonance region, which was previously ignored, is anticipated to offer unique access to the three quark plus sea component of the nucleon wave function. In this Letter, we present the first…
View article: Unique Access to u-Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction
Unique Access to u-Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction Open
Backward-angle meson electroproduction above the resonance region, which was previously ignored, is anticipated to offer unique access to the three quark plus sea component of the nucleon wave function. In this letter, we present the first…
View article: Separated kaon electroproduction cross section and the kaon form factor from 6 GeV JLab data
Separated kaon electroproduction cross section and the kaon form factor from 6 GeV JLab data Open
The H1(e,e′K+)Λ reaction was studied as a function of the Mandelstam variable −t using data from the E01-004 (FPI-2) and E93-018 experiments that were carried out in Hall C at the 6 GeV Jefferson Laboratory. The cross section was fully sep…
View article: High Resolution Spectroscopic Study of $^{10}_Λ$Be
High Resolution Spectroscopic Study of $^{10}_Λ$Be Open
Spectroscopy of a $^{10}_Λ$Be hypernucleus was carried out at JLab Hall C using the $(e,e^{\prime}K^{+})$ reaction. A new magnetic spectrometer system (SPL+HES+HKS), specifically designed for high resolution hypernuclear spectroscopy, was …
View article: High Resolution Λ Hypernuclear Spectroscopy with Electron Beams
High Resolution Λ Hypernuclear Spectroscopy with Electron Beams Open
T. Gogami1 ∗, P. Achenbach2, A. Ahmidouch3, I. Albayrak4, D. Androic5, A. Asaturyan6, R. Asaturyan6, O. Ates4, P. Baturin7, R. Badui7, W. Boeglin7, J. Bono7, E. Brash8, P. Carter8, C. Chen4, A. Chiba1, E. Christy4, S. Danagoulian3, R. De L…
View article: Stabilization of a high-order harmonic generation seeded extreme ultraviolet free electron laser by time-synchronization control with electro-optic sampling
Stabilization of a high-order harmonic generation seeded extreme ultraviolet free electron laser by time-synchronization control with electro-optic sampling Open
A fully coherent free electron laser (FEL) seeded with a higher-order harmonic (HH) pulse from high-order harmonic generation (HHG) is successfully operated for a sufficiently prolonged time in pilot user experiments by using a timing drif…
View article: Separated response functions in exclusive, forward π [superscript ±] electroproduction on deuterium
Separated response functions in exclusive, forward π [superscript ±] electroproduction on deuterium Open
Background: Measurements of forward exclusive meson production at different squared four-momenta of the exchanged virtual photon, Q[superscript 2], and at different four-momentum transfer, t, can be used to probe QCD's transition from meso…