[en] The Great East Japan Earthquake that occurred on March 11 last year caused significant damage to the Photon Factory (PF). Fortunately, since the user experiments had concluded on the morning of the earthquake, there were no human casualties. However, both the accelerator and experimental equipment sustained considerable damage, leading to the suspension of experiments until July. Experiments were resumed in the fall, and this report details the restoration efforts and seismic countermeasures implemented during that period. Additionally, it introduces the disaster prevention and fire safety measures undertaken by the facility, which accommodates over 3,000 users annually. (J.P.N.)

[en] Using the electron beam welding machine installed in the development shared building, we are fabricating in-house 9-cell superconducting accelerating cavities for the ILC. The next phase involves research and development aimed at developing automation technology and reducing costs. This report focuses on the first unit currently under production. (J.P.N.)

[en] At the Superconducting RF Test Facility (STF) of the High Energy Accelerator Research Organization, an international collaborative test called S1 Global was conducted from July 2010 to February 2011 as part of the technology development for the International Linear Collider (ILC) project. This test was divided into three stages: Stage 1 involved driving eight superconducting cavities with a single klystron, Stage 2 used two klystrons to drive four cavities each, and Stage 3 evaluated the Distributed RF System (DRFS), which drives two cavities with one klystron. To achieve the amplitude and phase stability of the accelerating field required for the ILC, digital feedback (FB) and feedforward (FF) control were necessary. An FPGA board based on compact PCI was used up to Stage 2, while a newly developed μTCA-based system was adopted for Stage 3. In addition to power meter measurements, an IF (Intermediate Frequency) mixing method and an FPGA board equipped with a 34-channel ADC were used for performance evaluation. These allowed the measurement of multiple signals with a single ADC, anticipating the need for more signal acquisition in the future. This report focuses on the low-level RF (LLRF) system at STF, particularly during Stage 3. (J.P.N.)

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[en] The High Energy Accelerator Research Organization (KEK) has been conducting B-Factory experiments using the KEKB electron-positron collider. To enhance the performance of the KEKB accelerator, the design and construction of the SuperKEKB accelerator are underway. This project aims to increase the recorded luminosity of the KEKB accelerator by approximately 40 times, necessitating a reduction in the vertical beam size to several tenths of that of the KEKB accelerator. Excessive ground micro-vibrations and significant mechanical vibrations from equipment can reduce collision frequency, hence the vibration levels of the magnet support system and the floor near the KEKB collision point were measured, and vibration characteristics were investigated. Additionally, the finite element method was used to verify consistency with the measured values, and this was applied to the design of the magnet support system for SuperKEKB. This report presents the results of these measurements and analyses. (J.P.N.)

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