Toshikazu Ebisuzaki

Photomultiplier development and wavelength shifter manufacturing to increase the detection of faint fluorescence signals

RIKEN has developed in collaboration with Hamamatsu a new type of Multi Anode Photomultiplier (MAPMT), R8900 series, with a large sensitive area of ~ 83% of the physical surface. The performance of R8900 is reviewed in the following. RIKEN has also manufactured a new type of wavelength shifter (w.s.) film to shift near-UV light (330 ÷ 400 nm) to visible one. This film uses POPOP as a shifter and EPO-TEX as a substrate. The quantum efficiency of the film reaches ~ 80%.

Simulations of magnetic materials with MDGRAPE-2

The use of accelerator hardware for micromagnetics simulations is described, along with some initial results. The accelerator calculates the dipole interactions at 400 gigaflops, allowing large simulations to be performed with arbitrary geometries. Two research programs are highlighted, the simulation of a curved MRAM cell and the simulation of the write head in a computer disk drive.

OWL—Orbital Wide-angle Light-collector for the air watch program, and multiple OWL

The International Space Station (ISS) will revolutionize scientific experimentation by providing a platform upon which some of the most ambitious projects yet conceived may be constructed, operated, and deployed. The Orbiting Wide-angle Light-collector (OWL-Airwatch) is a proposed space-based extensive air shower observatory which will detect a significant number of cosmic rays with energies above 1020u2009eV (Takahashi, 1996; Streitmatter, 1998; DeMarzo, 1998). A complete understanding of the origins and propagation of these particles may only be possible by introducing new and exotic physical mechanisms, and OWL-Airwatch may provide the first definitive evidence for the existence and decay of topological defects and other such exotic phenomena. There also exists the possibility of detecting high energy neutrinos as well as observing the effects of quantum gravity with the OWL-Airwatch instrument. Although the first OWL-Airwatch mission is planned as a free-flying observatory, its scientific abilities can be...

Mini-EUSO optics design and tests

Mini-EUSO (UV atmosphere in Russian Space Program) is a science mission to observe UV phenomena in the night Earth atmosphere from a UV transparent porthole of the International Space Station and will serve as a pathfinder for future ultra-high energy cosmic ray missions such as KLYPVE-EUSO (K-EUSO) and JEM-EUSO. The Mini-EUSO optical design has two 250 mm double-sided Fresnel lenses and a flat focal surface. The overall length of the optical system is 300 mm. Its field of view is about

Grand Observatories and multiple-OWL for high energy neutrino astrophysics

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Molecular Dynamics Machine: Highly Parallelized Special-Purpose-Computer for Molecular Dynamics Simulations

. The RMS spot sizes between

Special-purpose computer for molecular dynamics simulations

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Wide band normal incident telescope

and

MD simulations on the structure of onco-proteins p53: Wild-type and radioresistant mutant systems

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Processing unit for broadcast parallel processing

field angle are 2.0 mm