[en] At the ion storage and cooler ring, S-LSR completed at ICR, Kyoto University in October, 2005, the electron cooling has been successfully performed for 7 MeV proton resulting the momentum spread of 5 x 10^-6, although the 1 dimensional ordering is not yet observed. Electron cooled short bunch beam with the pulse width of < 20 ns has been extracted. Stacking of the electron cooled proton beam resulted in the vertical beam instability, which was found to be damped by the feedback utilizing the picked up signals by the electrostatic position monitor. (author)

[en] Scheme to collect effectively by rotating laser produced ions in the longitudinal phase space with use of an RF electric field synchronized to the high-power short-pulse laser has been developed. Results of experimental studies performed with 12 TW, 50 fs pulse laser to prepare the real explosion of 100 TW, 20 fs laser are presented together with the design of the RF cavity for phase rotation. (author)

[en] A new approach to beam crystallization using dispersion control is suggested. Bending magnets of S-LSR, equipped with electrostatic deflector, can control its dispersion function. If positive and negative dispersions are set alternately, the effect of shear force can be reduced. In this method, the storage ring will have a finite dispersion at the RF cavity. Consequently, reduction of shear force and dispersive transverse laser cooling will be compatible. (author)

[en] The great majority of individuals with early breast cancer are potential candidates for treatment with conservative surgery and radiotherapy. A 55 years old women with pre-existing rheumatoid arthritis suffered from severe cough and SOB within 3 months after definitive radiation therapy for breast cancer. The chest radiograph showed bilateral pulmonary infiltrate and the diagnosis of BOOP was confirmed by TBLB findings. After corticosteroid therapy, the clinical improvement was dramatic, and the pulmonary shadow disappeared completely. Radiation oncologists should be cautious in the treatment of early breast cancer with collagen vascular disease even in the remission status. (author)

[en] Design of quadrupole magnets for a compact ion accumulation and cooler ring, S-LSR, is presented. By requirements from lattice parameters and spatial boundaries for real installation in S-LSR, quadrupole magnets with relatively short magnetic length but wide horizontal aperture are needed. In this paper, we present results obtained from magnetic field calculations by 2D and 3D modelings, and describe the optimization of a pole face shape and fringing edge (chamfer cut design)

[en] At ICR, Kyoto University, an ion storage and cooler ring, S-LSR has been completed in October, 2005 and beam experiments, such as an electron beam cooling, feedback damping of coherent instability and accumulation of Mg ion for laser cooling, are now going on. Here present status of the facility is to be presented together with future prospects of the facility. (author)

[en] A deflection electrostatic deflector has been designed for an ion storage ring. This electrostatic deflector, together with a dipole magnet makes a condition where a dispersion function of ion beams is controlled at a bending section. For this purpose, the electrostatic deflectors are designed, and the deviation of the calculated field from the ideal value is less than 0.1%, within 2.5 mm from the beam axis. The effect of a hole for laser injection is also considered. After modification of the structure of the electrodes, the deviation near the hole is improved. We planned the experiment to verify the effect of dispersion control by using the first constructed deflection element. An ion beam will be produced from an ion source and injected into the deflection element directly. Adjustment of an ion source and the setup of the experiment are also considered. (author)

[en] Laser cooling of ion beams generally operates only upon the longitudinal motion of an ion beam. In order to extend this powerful dissipative force to the transverse directions, we consider introducing a Wien filter in a cooing straight section. It is theoretically shown that longitudinal cooling within a Wien filter naturally develops a transverse (mostly horizontal) cooling effect as well. Molecular dynamics simulations demonstrate that this method enables us to reach an ultralow-temperature state of a stored ion beam. (author)

[en] Closed orbit correction with be applied to S-LSR for dispersion free mode. Gradual transfer from normal mode to dispersion free one is needed and addition of electric field and correction of closed orbit distortion (COD) is shifted step by step to guide the ions through 30x26mm aperture in bending sections. Maximum COD is reduced from 2.5mm to 0.8mm using a proton beam. Based on this result, possible process to realize the dispersion-free mode is simulated. During the process, COD will be kept below 9mm, smaller than vertical aperture of ±13mm. (author)

[en] A beam test for the feedback damping of a coherent instability at small-laser equipped storage ring (S-LSR) was carried out. The instability caused beam loss, which limited the stored beam current to be about 600 μA during beam stacking with electron cooling. A vertical feedback damping system (VFS) using an electro-static beam monitor (ESBPM) and a vertical kicker was applied to suppress this beam instability. The VFS realized not only suppressing the vertical coherent instability, but also revealing the characteristics of the feedback damping. (author)