Masashi Furusawa
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View article: Simulation of Phase-space Offset Injection with Second Harmonic RF for Longitudinal Emittance Blow-up in J-PARC MR
Simulation of Phase-space Offset Injection with Second Harmonic RF for Longitudinal Emittance Blow-up in J-PARC MR Open
View article: Operation Experience of Tetrode Vacuum Tubes in J-PARC Ring RF System
Operation Experience of Tetrode Vacuum Tubes in J-PARC Ring RF System Open
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: Consideration of Triple-Harmonic Operation for the J-PARC RCS
Consideration of Triple-Harmonic Operation for the J-PARC RCS Open
The wideband magnetic alloy (MA) cavities are employed in the J-PARC RCS. The dual-harmonic operation, in which each MA cavity is driven by superposition of the fundamental accelerating voltage and the second harmonic voltage, significantl…
View article: Vacuum Tube Operation Tuning for a High Intensity Beam Acceleration in J-PARC RCS
Vacuum Tube Operation Tuning for a High Intensity Beam Acceleration in J-PARC RCS Open
Tetrode vacuum tubes in the J-PARC RCS are used under a reduced filament voltage condition compared with the rating value to prolong the tube life time. One tube reached the end of life in 2020; it was the first case in the RCS after 60,00…
View article: Simulations of beam loading compensation in a wideband accelerating cavity using a circuit simulator including a LLRF feedback control
Simulations of beam loading compensation in a wideband accelerating cavity using a circuit simulator including a LLRF feedback control Open
Magnetic alloy cavities are employed in the J-PARC RCS to generate high accelerating voltages. The cavity, which is driven by a vacuum tube amplifier, has a wideband frequency response and the beam loading in the cavity is multiharmonic. T…
View article: Multiharmonic vector rf voltage control for wideband cavities driven by vacuum tube amplifiers in a rapid cycling synchrotron
Multiharmonic vector rf voltage control for wideband cavities driven by vacuum tube amplifiers in a rapid cycling synchrotron Open
Beam loading compensation in the rf cavities is a key for acceleration of high-intensity beams in the 3 GeV rapid cycling synchrotron (RCS) of the Japan Proton Accelerator Research Complex (J-PARC). Since we employ wideband magnetic alloy …
View article: Simulations of Beam Loading Compensation in a Wideband Accelerating Cavity Using a Circuit Simulator Including a LLRF Feedback Control
Simulations of Beam Loading Compensation in a Wideband Accelerating Cavity Using a Circuit Simulator Including a LLRF Feedback Control Open
Magnetic alloy cavities are employed in the J-PARC RCS to generate high accelerating voltages. The cavity, which is driven by a vacuum tube amplifier, has a wideband frequency response and the beam loading in the cavity is multiharmonic. T…
View article: Vacuum Tube Operation Analysis for 1.2 MW Beam Acceleration in J-PARC RCS
Vacuum Tube Operation Analysis for 1.2 MW Beam Acceleration in J-PARC RCS Open
The J-PARC RCS has successfully accelerated 1 MW proton beam, matching the designed beam power. Therefore, we have considered acceleration beyond the designed beam power, with the next target being 1.2 MW. An issue for 1.2 MW beam accelera…
View article: Baseband simulation model of the vector rf voltage control system for the J-PARC RCS
Baseband simulation model of the vector rf voltage control system for the J-PARC RCS Open
Vector rf voltage feedback control for the wideband magnetic alloy cavity of the J-PARC RCS is considered to be employed to compensate the heavy beam loading caused by high intensity proton beams. A prototype system of multiharmonic rf vec…
View article: Conceptual design of a single-ended MA cavity for J-PARC RCS upgrade
Conceptual design of a single-ended MA cavity for J-PARC RCS upgrade Open
The Japan Proton Accelerator Research Complex (J-PARC) Rapid Cycling Synchrotron (RCS) employs Magnetic Alloy (MA) loaded cavities. The rf power is fed by vacuum tubes in push-pull operation. We realize the multi-harmonic rf driving and th…
View article: Baseband Simulation Model of the Vector RF Voltage Control System for the J-PARC RCS
Baseband Simulation Model of the Vector RF Voltage Control System for the J-PARC RCS Open
Vector rf voltage feedback control for the wideband magnetic alloy cavity of the J-PARC RCS is considered to be employed to compensate the heavy beam loading caused by high intensity proton beams. A prototype system of multiharmonic rf vec…
View article: Present Status and Future Upgrades of the J-PARC Ring RF Systems
Present Status and Future Upgrades of the J-PARC Ring RF Systems Open
J-PARC is the multipurpose research institutes. 10 years have passed since the user operation started. We have been considering the upgrades for the future and the target beam powers for 3 GeV rapid cycling synchrotron (RCS) and 30GeV Main…
View article: Conceptual Design of a Single-Ended MA Cavity for J-PARC RCS Upgrade
Conceptual Design of a Single-Ended MA Cavity for J-PARC RCS Upgrade Open
The J-PARC RCS employes Magnetic Alloy (MA) loaded cavities and rf power is fed by vacuum tubes in push-pull operation. The multi-harmonic rf driving and the multi-harmonic beam loading compensation are realized due to the broadband charac…
View article: Batch Compression Scheme for Multi-MW J-PARC
Batch Compression Scheme for Multi-MW J-PARC Open
Replacement of all J-PARC MR cavities has completed in this summer to increase the RF voltage. Nine sets of new high-gradient FT3L cavities will generate the required RF voltage for the 1.16 second cycle operation. Upgrade of magnet power …