Development of highly-mechanically polished metal-substrate for neutron supermirrors

Takeda, Shin; Guo, Jiang; Morita, Shinya; Ono, Hirohisa; Oda, Takuya; Kato, Junichi; Sato, Hirotaka; Hino, Masahiro; Yamagata, Yutaka; Furusaka, M.

doi:10.1088/1742-6596/528/1/012011

Cited by 6 publications

(2 citation statements)

References 3 publications

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“…The optical potential of silicon is 54 neV, which is not high. A larger total reflection angle is generally necessary, and NiP on thin aluminium is a better candidate, because with NiP it is possible to obtain a very smooth surface even on a rough substrate [3,4].…”

Section: The Diode-like Neutron Mirrormentioning

confidence: 99%

A Diode-like Neutron Mirror for a Cold Neutron Moderator for Use in Neutron Beam Facilities

et al. 2014

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We propose a new type of neutron mirror for a cold moderator to provide a bright collimated beam. The neutron mirror has high reflectivity on its front side and is transparent on its back side. It works like a diode at a small glancing angle, and its use makes it possible to obtain a bright collimated beam by using both the neutron mirror and moderator material. Here we explain the concept of the diode-like neutron mirror and describe its feasibility as tested in a numerical simulation.

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Section: The Diode-like Neutron Mirrormentioning

confidence: 99%

A Diode-like Neutron Mirror for a Cold Neutron Moderator for Use in Neutron Beam Facilities

et al. 2014

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“…It can also increase the signal rate and improve resolution. Some techniques have previously been reported for fabricating neutron focusing mirrors such as numerically controlled local wet etching (NC-LWE), ultraprecision shaper cutting and fine polishing, bending technique and electroformed nickel replication [6][7][8][9][10][11][12][13][14][15][16]. Compared with other methods, the bending technique is simpler and more time-efficient from the viewpoint of cost-benefit performance.…”

Section: Introductionmentioning

confidence: 99%

Profile measurement of a bent neutron mirror using an ultrahigh precision non-contact measurement system with an auto focus laser probe

Morita

Guo

Yamada

et al. 2016

Meas. Sci. Technol.

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A bent neutron mirror has been considered as one of the best solutions for focusing neutron beams from the viewpoint of cost-benefit performance. Although the form deviation of the bent profile is expected because of the large spot size, it is difficult to measure due to its geometric limitation. Here, we propose a non-contact measurement system using an auto focus (AF) laser probe on an ultrahigh precision machine tool to precisely evaluate the form deviation of the bent mirror. The AF laser probe is composed of a diode laser, a position sensitive sensor, a charge-coupled device (CCD) camera and a microscope objective lens which is actuated by an electromagnetic motor with 1 nm resolution for position sensing and control. The sensor enables a non-contact profile measurement of a high precision surface without any surface damage in contrast with contact-type ultrahigh precision coordinate measurement machines with ruby styli. In the on-machine measurement system, a personal computer simultaneously acquires a displacement signal from the AF laser probe and 3-axis positional coordinates of the ultrahigh machine tool branched between the linear laser scales and the numerical controller. The acquisition rate of the 4-axis positional data in 1 nm resolution is more than 10 Hz and the simultaneity between the axes is negligible. The profile of a neutron bent mirror was measured from a transparent side using the developed system, and the result proves that the form deviation of the mirror enlarged the the spot size of focused neuron beam.

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Figure correction of a metallic ellipsoidal neutron focusing mirror

Guo

Yamagata

Morita

et al. 2015

Review of Scientific Instruments

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An increasing number of neutron focusing mirrors is being adopted in neutron scattering experiments in order to provide high fluxes at sample positions, reduce measurement time, and/or increase statistical reliability. To realize a small focusing spot and high beam intensity, mirrors with both high form accuracy and low surface roughness are required. To achieve this, we propose a new figure correction technique to fabricate a two-dimensional neutron focusing mirror made with electroless nickel-phosphorus (NiP) by effectively combining ultraprecision shaper cutting and fine polishing. An arc envelope shaper cutting method is introduced to generate high form accuracy, while a fine polishing method, in which the material is removed effectively without losing profile accuracy, is developed to reduce the surface roughness of the mirror. High form accuracy in the minor-axis and the major-axis is obtained through tool profile error compensation and corrective polishing, respectively, and low surface roughness is acquired under a low polishing load. As a result, an ellipsoidal neutron focusing mirror is successfully fabricated with high form accuracy of 0.5 μm peak-to-valley and low surface roughness of 0.2 nm root-mean-square.

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Development of highly-mechanically polished metal-substrate for neutron supermirrors

Cited by 6 publications

References 3 publications

A Diode-like Neutron Mirror for a Cold Neutron Moderator for Use in Neutron Beam Facilities

A Diode-like Neutron Mirror for a Cold Neutron Moderator for Use in Neutron Beam Facilities

Profile measurement of a bent neutron mirror using an ultrahigh precision non-contact measurement system with an auto focus laser probe

Figure correction of a metallic ellipsoidal neutron focusing mirror

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