K. Ishii
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View article: The Leakage Field of the New High-Field Septum Magnets for Fast Extraction in Main Ring of J-PARC
The Leakage Field of the New High-Field Septum Magnets for Fast Extraction in Main Ring of J-PARC Open
As part of the effort to increase the beam power of the Main Ring (MR) for fast extraction (FX) in J-PARC to 750 kW, five new septum magnets for FX (FX-septa) were installed in the MR in 2022. The most significant goal for the magnets was …
View article: Vasovagal reactions after COVID-19 vaccination in Japan
Vasovagal reactions after COVID-19 vaccination in Japan Open
Coronavirus disease 2019 (COVID-19) vaccine administration started in February 2021 in Japan. As of December 2021, approximately 75% of the population aged ≥12 years had received two doses of vaccine. We conducted a study to investigate va…
View article: Measurement of Neutrino Oscillation with KamLAND: Evidence of Spectral Distortion
Measurement of Neutrino Oscillation with KamLAND: Evidence of Spectral Distortion Open
We present results of a study of neutrino oscillation based on a 766 ton/year exposure of KamLAND to reactor antineutrinos. We observe 258 [overline nu ]e candidate events with energies above 3.4 MeV compared to 365.2±23.7 events expected …
View article: Accelerator design for 1.3-MW beam power operation of the J-PARC Main Ring
Accelerator design for 1.3-MW beam power operation of the J-PARC Main Ring Open
The J-PARC Main Ring (MR) has supplied the high-intensity proton beam for the T2K long-baseline neutrino experiment since 2010. The present beam power is 510 kW and the total number of protons on the target reaches $3.64\times10^{21}$. To …
View article: Layout of the New Septum Magnets for Fast Extraction in J-PARC Main Ring
Layout of the New Septum Magnets for Fast Extraction in J-PARC Main Ring Open
At J-PARC Main Ring (MR), we are pursuing to improve the beam power from 500 kW to 1.3 MW by reducing the repetition cycle from 2.48 to 1.16 seconds (1 Hz operation). Additionally, we are considering the beam particles increasing by select…
View article: Development of Disaster Prevention System for Accelerator Tunnel
Development of Disaster Prevention System for Accelerator Tunnel Open
In an enclosed space such as a particle accelerator tunnel, ensuring worker safety during a disaster is an issue of critical importance. It is necessary to have a system in which the manager can know from outside the tunnel whether there i…
View article: The New Eddy Current Type Septum Magnets for Upgrading of Fast Extraction in Main Ring of J-PARC
The New Eddy Current Type Septum Magnets for Upgrading of Fast Extraction in Main Ring of J-PARC Open
The J-PARC Main Ring (MR) is currently working on upgrading the machine power reach to 750 kW by increasing the beam repetition rate from 0.4 Hz to 0.78 Hz. This new operation mode is referred as ”1 Hz” operation. The Fast eXtraction (FX) …
View article: The New High Field Septum Magnets for Upgrading of Fast Extraction in Main Ring of J-PARC
The New High Field Septum Magnets for Upgrading of Fast Extraction in Main Ring of J-PARC Open
The J-PARC Main Ring (MR) is working on imporved beam to 750 kW by shorting the repetition period from 2.48 s to 1.3 s which we call 1Hz operation. There are fout high field septum magnet along the fast extraction line in the MR, and these…
View article: Recent Improvements and Future Upgrades of the J-PARC Main Ring Kicker Systems
Recent Improvements and Future Upgrades of the J-PARC Main Ring Kicker Systems Open
J-PARC Main Ring provides 500kW proton beam to the long baseline neutrino oscillation experiment (T2K). In order to increase the beam intensity to improve the sensitivity of the CP violation study in neutrino sector, shorter repetition cyc…
View article: The Development of a New Low Field Septum Magnet System for Fast Extraction in Main Ring of J-PARC
The Development of a New Low Field Septum Magnet System for Fast Extraction in Main Ring of J-PARC Open
The J-PARC Main Ring are working on improved beam power to 750 kW by shortening the repetition period from 2.48 s to 1.3 s. The low-field septum magnets in the fast extraction beam line will be replaced by new magnets around 2020. We const…
View article: The Development of a New Low Field Septum Magnet System for Fast Extraction in Main Ring of J-PARC
The Development of a New Low Field Septum Magnet System for Fast Extraction in Main Ring of J-PARC Open
The J-PARC Main Ring (MR) is being upgraded to improve its beam power to the design goal of 750 kW. One important way is to reduce the repetition period from 2.48 s to 1.3 s so that the beam power can be nearly doubled. We need to improve …
View article: The New High Field Injection Septum Magnet System for Main Ring of J-PARC
The New High Field Injection Septum Magnet System for Main Ring of J-PARC Open
We are improving the Main Ring (MR) for beam power of 750 kw which is the first goal of J-PARC. The repetition period of the fast extraction must be short to 1.3 second from the current period of 2.48 second for the improvement of the beam…
View article: Performance of a Compensation Kicker Magnet for J-PARC Main Ring
Performance of a Compensation Kicker Magnet for J-PARC Main Ring Open
Four lumped-type kicker magnets have been equipped in the J-PARC MR (Main Ring) to inject 8 proton bunches. To increase beam power, the bunch length will be increased up to 350 ns that will restricts the rise time of the injection kicker t…
View article: The Development of a New Low Field Septum Magnet System for Fast Extraction in Main Ring of J-PARC
The Development of a New Low Field Septum Magnet System for Fast Extraction in Main Ring of J-PARC Open
The J-PARC Main Ring (MR) is being upgraded to improve its beam power to the design goal of 750 kW. One important way is to reduce the repetition period from 2.48 s to 1.3 s so that the beam power can be nearly doubled. We need to improve …
View article: The Development of a New High Field Injection Septum Magnet System for Main Ring of J-Parc
The Development of a New High Field Injection Septum Magnet System for Main Ring of J-Parc Open
We are improving the Main Ring (MR) for beam power of 750 kw which is the first goal of J-PARC. The repetition period of the fast extraction must be short to 1.3 second from the current period of 2.48 second for the improvement of the beam…
View article: New Arrangement of Collimators of J-PARC Main Ring
New Arrangement of Collimators of J-PARC Main Ring Open
The beam collimation system of J-PARC main ring has been prepared in order to localize the beam loss into the specified area, especially during the injection period. At the first time, it was constructed as a scraper-catcher system in hori…