Explanipedia

Observation of Coulomb-Assisted Nuclear Bound State of System Open

S. Hayakawa, K. Agari, J. K. Ahn, T. Akaishi, Y. Akazawa , et al. · 2021

In an emulsion-counter hybrid experiment performed at J-PARC, a Ξ^{-} absorption event was observed which decayed into twin single-Λ hypernuclei. Kinematic calculations enabled a unique identification of the reaction process as Ξ^{-}+^{14}…

A Recent Upgrade on Phase Drift Compensation System for a Stable Beam Injection at J-PARC Linac Open

Ersin Cicek, Z. Fang, Y. Fukui, K. Futatsukawa, Hirane Tatsuya , et al. · 2021

J-PARC linac, consisting of 324 MHz and 972 MHz acceleration sections, delivers H⁻ beam to the rapid cycling synchrotron (RCS). The drift in the beam injection momentum from linac to RCS was measured to be highly dependent on the humidity …

A Fused Thiophene-S,S-Dioxide-Based Super-Photostable Fluorescent Marker for Lipid Droplets Open

Masayasu Taki, Keiji Kajiwara, Eriko Yamaguchi, Y. Sato, Shigehiro Yamaguchi · 2020

Lipid droplets (LDs) are essential organelle in most eukaryotes, and tracking intracellular LDs dynamics using synthetic small molecules is crucial for biological studies. However, only a limited number of fluorescent markers that satisfy …

A Fused Thiophene-S,S-Dioxide-Based Super-Photostable Fluorescent Marker for Lipid Droplets Open

Masayasu Taki, Keiji Kajiwara, Eriko Yamaguchi, Y. Sato, Shigehiro Yamaguchi · 2020

Lipid droplets (LDs) are essential organelle in most eukaryotes, and tracking intracellular LDs dynamics using synthetic small molecules is crucial for biological studies. However, only a limited number of fluorescent markers that satisfy …

Studies on coherent multi-bunch tune shifts with different bunch spacing at the J-PARC Main Ring Open

A. Kobayashi, T. Toyama, Y. Sato, S. Igarashi, Tetsushi Shimogawa , et al. · 2019

At a high-power proton synchrotron, betatron tune shifts induced by space charge effects cause beam loss which limits the beam intensity. To achieve further high beam intensity at the main ring of the Japan Proton Accelerator Research Comp…

The Realization of Iterative Learning Control for J-PARC LINAC LLRF Control System Open

Li Song, Zhigao Fang, Y. Fukui, K. Futatsukawa, Feng Qiu , et al. · 2019

The beam current of j-parc linac was planned to increase to 60 mA. The stronger beam current will lead to higher beam loading effect. Due to the low Q factor of cavity in high β section of linac, the traditional PID feedback feedforward co…

The upgrade of J-PARC linac low-level radio frequency system Open

S. Li, K. Futatsukawa, Y. Fukui, Z. Fang, Shinichi Shinozaki , et al. · 2018

The J-PARC linac was consist of 324MHz low-β section and 972MHz high-β section. There is a total of 48 stations. And each station was equipped with an independent LLRF (Low-Level Radio Frequency) system to realize an accelerating field sta…

Adaptive Feedforward Control Design Based on Simulink for the J-PARC LINAC LLRF System Open

Song Li, Zhigao Fang, Y. Fukui, K. Futatsukawa, Satoshi Mizobata , et al. · 2018

In j-parc linac, for dealing with high beam loading effect, an adaptive feedforward control method which based on iterative learning control was put forward. At the same time, in order to verify its effectiveness before it is officially pu…

Development of New LLRF System at the J-PARC Linac Open

K. Futatsukawa, Z. Fang, Y. Fukui, Y. Sato, Shinichi Shinozaki · 2018

In the J-PARC linac, the LLRF system with the digital feedback (DFB) and the digital feedforward (DFF) was adopted for satisfying requirement of amplitude and phase stabilities. It has been operated without serious problems. However, it ha…

Improvement of the Chopper System for rf Deflector at the J-PARC Linac Open

K. Futatsukawa, Zhigao Fang, Y. Fukui, Y. Sato, Shinichi Shinozaki · 2018

In the J-PARC linac, the RF deflector has been operated to kick the wasted beam and to shape the intermediate-pulse like the comb structure. Then about 50% of the beam current is removed by leading the scraper and the rest beam current is …

A 3-MeV Linac for Development of Accelerator Components at J-PARC Open

Yasuhiro Kondo, Hiroyuki Asano, E. Chishiro, Zhigao Fang, Y. Fukui , et al. · 2017

We are constructing a linac for development of accelerator components at J-PARC. This linac consists of a H⁻ ion source, a low energy beam transport (LEBT), an radio frequency quadrupole (RFQ) linac, and a diagnostics bean line. The beam e…

Development of a dual frequency (110/138 GHz) gyrotron for JT-60SA and its extension to an oscillation at 82 GHz Open

Takayuki Kobayashia, S. Moriyama, A. Isayama, M. Sawahata, M. Terakado , et al. · 2015

\nA dual-frequency gyrotron, which can generate 110 GHz and 138 GHz waves independently, is being developed in JAEA to enable electron cyclotron heating (ECH) and current drive (ECCD) in a wider range of plasma discharge conditions of JT-6…

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