Proceedings of JSPE Semestrial Meeting

This study deals with the reduction of coolant in cylindrical plunge grinding. A brush-nozzle is placed in order to block ′air-belt′ which is boundary layer on the wheel surface, and it helps the coolant adhere to the wheel surface. This study confirms that the quantity of coolant can be reduced from 10 l/min to 0.4 l/min by using the brush-nozzle. In addition, the brush-nozzle is effective in reducing grinding force and generation of smooth ground surface.

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Improvement of polishing performance against the hard-to-work material is required to realize high throughput manufacturing process of the wafers. Recently, Doi has reported new polishing technology of the high efficiency polishing methods of the materials assisted by plasma. In this method, it is difficult to use conventional polishing device because of microwave resistance. We develop new nano carbon particle formed by UV laser irradiation against fullerenol and diamond particles for the polishing method and will report our experimental results.

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The volume phase holographic (VPH) grating achieves high angular dispersion and very high diffraction efficiency for the first diffraction order and for S or P polarization. However the VPH grating could not achieve high diffraction efficiency for non-polarized light at a large diffraction angle and for higher diffraction order. The birefringence binary Bragg (3B) grating is a thick transmission grating with optically anisotropic material such as lithium niobate or liquid crystal. The 3B grating achieves diffraction efficiency up to 100% for non-polarized light by tuning of refractive indices for S and P polarizations, even on higher diffraction orders. The quasi-Bragg (QB) grating, which consists long rectangle mirrors aligned in parallel precisely such as a window shade, also achieves high diffraction efficiency toward higher orders. The quasi-Bragg immersion (QBI) grating has smooth mirror hypotenuse and reflector array inside the hypotenuse. The incident beam of the QBI grating reflects obliquely at a reflector, then reflects vertically at the mirror surface and reflects again at the same reflector. We are going to fabricate conventional silicon and germanium immersion gratings with step-like grooves by means of the latest diamond machining methods. We would introduce characteristics and performance of these gratings.

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In this paper, the focusing performance of an ellipsoidal neutron focusing mirror is evaluated by using neutron beams generated from CN3 beam port at Kyoto University Research Reactor (KUR-CN3). KUR-CN3 can generate a wavelength of neutrons from 0 to 10 Å, with a peak intensity at wavelength of 2.7 Å. To well focus the neutron beams, an aperture and slit are fabricated by using Cadmium. The aperture, which dominates the size of incident beam, is set to 1 mm in diameter by considering the intensity of cold neutrons. The U-shape slit. is designed by following the shape of incident beam to the mirror, and is used to shield the unnecessary beams. For collecting the data, a Register network Photo Multiplying Tube type detector (RPMT) which is capable of doing pulse neutron spectrometry with 2D Position sensitive and counting mode is adopted. The results show that the neutron beams are well focused by the mirror. The focusing spot size at FWHM is 1.050 mm and 1.047 mm in vertical and horizontal direction, which is almost equivalent to the size of aperture. From the 3D view of focused neutron beam, no significant diffuse scattering can be found.

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