実験報告書様式（一般利用課題・成果公開利用）（ ※本報告書は英語で記述してください。ただし、産業利用課題として採択されている方は日本語で記述していただいても結構です。 ）提出日 Date of Report

Experimental Report

2013/3/11

課題番号 Project No.2012A0085

装置責任者 Name of responsible person

実験課題名 Title of experiment

Masayasu Takeda

Development of high-performance focusing supermirror for

装置名 Name of Instrument/（BL No.）GISANS and angular-divergent measurements

SHARAKU/BL17

実験責任者名 Name of principal investigator

実施日 Date of Experiment

Dai Yamazaki

2012/6/27-2012/6/30,

所属 Affiliation

2012/11/2-2012/11/5

J-PARC Center, JAEA
試料、実験方法、利用の結果得られた主なデータ、考察、結論等を、記述して下さい。（適宜、図表添付のこと）
Please report your samples, experimental method and results, discussion and conclusions. Please add figures andtables for better explanation.
1. 試料 Name of sample(s) and chemical formula, or compositions including physical form.
No sample.
This experiment aimed performance tests of focusing supermirrors.

2. 実験方法及び結果 （実験がうまくいかなかった場合、その理由を記述してください。）
Experimental method and results.

If you failed to conduct experiment as planned, please describe reasons.

Performance tests of a vertically-focusing supermirror were carried out. The supermirror was developed as acomponent of a stacked supermirror and coated on a thin quartz substrate of 1 mm in thickness.
This experiment aimed at verifying the usefulness of the mirror in grazing-incidence small-angle scattering(GISANS) experiments. The focusing geometry is based on an ellipsoid whose parameters are as follows:

a=5525 mm, b=81.15mm, (x/a)2 + (y/b)2 = 1. The first focal point of the ellipsoid was located at 6950 mm fromthe moderator surface, where the slit S1 is placed, while the second focal point was at 18000 mm (DetectorPosition). The focusing supermirror, whose surface shape also makes up a part of the ellipsoid, was placed at
14380 mm from the moderator. The beam line setup is illustrated in Fig.1. When the beam width was 1 mm at
the slit S1 (at the first focal point), the focused beam width is supposed to be 0.49 mm at the detector.
The vertically-focused beam was observed with a scintillation area detector which uses a photomultipliertube with dividing resisters (RPMT). Spatial profile of the focused beam is shown in the left panel of the Fig.2.
We subsequently collimated the focused beam transversally with the slits S1~S5 and observed the beamprofile to obtain information on whether the focusing supermirror is useful in GISANS experiments. The
transverse collimation was determined with S1 and S5 whose widths were both 1.0mm. The two-dimensional
profile is shown in the right panel of Fig. 2. It can be seen that focused peak width is around 1.5mm in fill width12. 実験方法及び結果（つづき） Experimental method and results (continued)
at half maximum which is larger than our expectation (0.5 mm). This could be attributed to spatial resolution of
the area detector and subtle distortion of the thin focusing mirror. As for the detector resolution, we shouldhave performed a measurement with an imaging plate whose resolution is 0.05 mm.
Figure3 shows the intensity of the beam in the right panel of Fig.2 as a function of distances from the beam
center which correspond to scattering angle 2 in SANS experiments. Beam intensity decreases rapidly bymore than 3 digits within 2mrad of “scattering angle” but intensity level at ~ 10-1 exits for 2 > 4mrad. Thelevel could deteriorate the measurement data in SANS experiments, but it looks like backgrounds and could beremoved by tuning the area detector and shielding the detector and beam line.
In conclusion, a vertically-focusing supermirror was developed and used to obtain a vertically-focused andtransversally collimated beam. Background level was observed about 4 digits smaller than the peak height.

Figure 1. The beam line setup. ‘Y’ and ‘Z’ denote the vertical direction and the beam line direction,respectively. Blue and black digits at the bottom show the position of slits (S1-S5), the focusing mirror,
sample stage or the detector surface.

Figure 2. Beam profiles of avertically focused beam (left)
and a vertically-focused andtransversally-collimated beam(right).

Figure 3. Intensity as a function of apparent“scattering angles” 2, which correspond to thedistance from the beam center (deduced from theright panel of Fig.2). The rapid decrease at 2 > 16
mrad shows the detector edge.

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