Phase rotation scheme of laser-produced ions for reduction of the energy spread

In order to widely spread out particle beams utilized in cancer therapy, laser-produced ions are developed as the injection beam for an ion synchrotron dedicated for cancer therapy. Such a laser ion source is expected to contribute largely to the realization of compactness of the size and low cost of the cancer therapy accelerator. The energy spectrum of the laser-produced ions, however, has no peak, but their intensities decrease exponentially according to the increase of the energy. For the purpose of modifying such a situation, we have proposed a scheme to rotate the beam in the longitudinal phase space with the use of the RF electric field, which is phase-adjusted with the pulse laser. We aim for a reduction of the energy spread of ± 5% selected by an energy analyzer and slits to ±1% by such phase rotation. For this purpose, a quarter wavelength resonator with two gaps with the same resonant frequency as the source laser has already been fabricated, together with its RF power source. The above phase rotation system and its recent experimental realization are presented.     

Experimental demonstration of the induction synchrotron

We report an experimental demonstration of the induction synchrotron, the concept of which has been proposed as a future accelerator for the second generation of neutrino factory or hadron collider. The induction synchrotron supports a superbunch and a superbunch permits more charge to be accelerated while observing the constraints of the transverse space-charge limit. By using a newly developed induction acceleration system instead of radio-wave acceleration devices, a single proton bunch injected from the 500 MeV booster ring and captured by the barrier bucket created by the induction step voltages was accelerated to 6 GeV in the KEK proton synchrotron.     

Further studies on palytoxin. II. structure of palytoxin

The full structure of palytoxin, a potent coelenterate toxin, is reported.     

Chemical constituents of Bolbostemma paniculatum (Maxim) Franquet: III. Structure of tubeimoside I

From the bulbs of Bolbostemma paniculatum (Maxim) Franquet (Cucurbitaceae), five glycosides: tubeimosides I, II, III, IV, and V were isolated. The structure of the tubeimoside I was elucidated by degradation and spectral analyses. It has inter-saccharide chain bridgied by a dicrotalic acid to form a unique macrocyclic structure.     

Carbamate mediated functionalization of unsaturated alcohols II. Regio- and stereo-selective synthesis of 1,3-syn and 1,2-anti amino alcohol derivatives via iodocarbamation

A regio- and stereo-selective introduction of nitrogen functions to double bonds of acyclic, allylic and homoallylic alcohols was achieved via iodocyclization of the corresponding N-sulfonylated O-carbamates.     

Studies on vocal fold injection and changes in pitch associated with alcohol intake

The current study was carried out with particular emphasis on the association between phonetic function tests and alterations in the appearance of the hypopharyngeal and laryngeal mucosa, such as capillary dilatation, edema, and vocal fold injection after alcohol intake. The results demonstrated the occurrence of previously unrecognized pathophysiological changes associated with synchronous phonetic functions in the vocal pathway after alcohol intake. Serum ethanol and aldehyde concentration levels were evaluated hourly for 2.5 h after ingestion of alcohol. When an electronystagmogram showed the typical pattern of alcohol intake, the study was initiated. Occasionally, rhinography was performed on subjects complaining of a stuffy nose after alcohol intake.     

Exact coverings of 2-paths by hamilton cycles

We construct a C(2m, 2m, 2) design which is a family of Hamilton cycles in K_2m so that each 2-path of K_2m lies in exactly two of the cycles.     

Effects of the three-spin interactions on the magnetic properties of a simple cubic Ising ferromagnet

For a spin one-half simple cubic Ising ferromagnet, the three-spin interaction are shown to have significant effects on the Curie temperature, the magnetization and the magnetic specific heat based on a calculation by the Bethe-Peierls theory.