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Nishiuchi, Mamiko; Sakaki, Hironao; Hori, Toshihiko; Bolton, P.; Ogura, Koichi; Sagisaka, Akito; Yogo, Akifumi; Mori, Michiaki; Orimo, Satoshi; Pirozhkov, A. S.; et al.
Physical Review Special Topics; Accelerators and Beams, 13(7), p.071304_1 - 071304_7, 2010/07
Times Cited Count：25 Percentile：79.33(Physics, Nuclear)A laser-driven repetition-rated 1.9 MeV proton beam line composed of permanent quadrupole magnets (PMQs), a radio frequency (rf) phase rotation cavity, and a tunable monochromator is developed to evaluate and to test the simulation of laser-accelerated proton beam transport through an integrated system for the first time. In addition, the proton spectral modulation and focusing behavior of the rf phase rotationcavity device is monitored with input from a PMQ triplet. In the 1.9 MeV region we observe very weakproton defocusing by the phase rotation cavity. The final transmitted bunch duration and transverse profile are well predicted by the PARMILA particle transport code. The transmitted proton beam duration of 6 ns corresponds to an energy spread near 5% for which the transport efficiency is simulated to be 10%. The predictive capability of PARMILA suggests that it can be useful in the design of future higher energy transport beam lines as part of an integrated laser-driven ion accelerator system.
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JNC TN7400 2001-012, 209 Pages, 2001/03
JNC-TN7400-2001-012.pdf:13.68MB
Japan Nuclear Cycle Development Institute (JNC) is presently carrying out investigation and researches of the Phase I of the Mizunami Underground Research Laboratory (MIU) project in Mizunami, Gifu Prefecture, JAPAN. The project consists of the following three phases; (1)Surface-based Investigations Phase I, (2)Construction Phase II, (3)Operations Phase III. Geomechanical investigations in the first phase include laboratory tests to determine the mechanical and physical properties of the Toki granite and stress measurements using hydraulic fracturing and AE/DRA in three deep boreholes, AN-1, MIU-1 and MIU-2. The purpose of these investigations and preliminary analysis is to obtain baseline information and to predict the excavation disturbance due to constructiou of the underground research laboratory (URL). This is necessary for detailed planning of geomechanical studies in the second and third phases. Therefore, a 3-D elastic analysis using the boundary element method (code name: Examin3d) was carried out. The code used can readily model the complicated layout of underground structures such as the URL. The extent of damage due to stress concentration and deformation around the drifts was estimated, based on the results of uniaxial compression tests (strength, strain) for the Toki granite. The extent of stress redistribution is defined for any area with over 1mm displacement in the analysis. In this analysis, two different structural styles of the bedrock were assumed [Case 1: Bedrock is isotropic and homogeneous] [Case 2: Bedrock is comprised of three zones having different rock properties and in situ stress conditions depth dependent.] Five sets of input parameters, based on variations in elastic modulus and poisson's ratio, were used to consider the effect of fractures in bedrock. Baseline data for determination of input parameters and in situ stress conditions adopted the results from the AN-1 borehole, which are expected to represent the minimum ...
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JNC TN7420 2001-001, 55 Pages, 2000/10
JNC-TN7420-2001-001.pdf:1.74MB
Geomechamcal investigations have been carried out since 1998 in 1000m depth surface boreholes as surface-based investigation phase in Mizunami Underground Research Laboratoly(MIU) project. The objectives of the investigation are: (1)to develop the conceptual geomechanical model in this phase of MIU project, (2)to obtain mechanical data on the Toki granite for design of the underground research laboratory. The geomechanical investigations in MIU-3 borehole were carried out in 2000 and focused on the major reverse fault, Tukiyoshi fault intersected at approximately 700m depth in MIU-3 borehole. The investigations consist of three parts: (1)Laboratoly tests to determine the mechanical properties of the rock matrix. (2)Stress measurement in the laboratoly using the AE method. (3)In-situ stress measurement using the hydraulic fracturing. This report describes the results of the geomechanical investigations in the borehole and laboratory. Additionally, integration of the geological, geophysical and geomechanical investigations in AN-1, MIU-1, MIU-2 and MIU-3 boreholes is attempted to establish a conceptual geomechanical model of the Toki granite, The results are summarized as follows: *In MIU-3 borehole, the distribution of the mechanical properties in the granite changes with depth in definable sections from the top of the granite to 300m, from 300 to 600m and over 800m. The hanging wall of the Tukiyoshi fault (to 600m depth) can be divided into two section. The mechanical properties of the granite in foot wall of the fault is estimated with similar properties of the granite in hanging wall of the fault. The results of the seismic velocity measurements of the cores in two dimension show that the degree of the anisotropy in the rock matrix are different between the hanging and the foot wall of the fault. *In MIU-3 borehole, the vertical component of stress tensors is changing near the Tukiyoshi fault and it is lower than the overburden pressure in the foot wall of ...
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JNC TN7420 2000-001, 51 Pages, 2000/03
JNC-TN7420-2000-001.pdf:1.71MB
The geomechanical investigations have been carried out in surface boreholes with 1000m depth since 1998 as a part of the investigations in pre-investigation phase in MIU (Mizunami Underground Research Laboratory) project. The objectives of the investigation are: (1)to develop the geomechanical conceptual model in pre-investigation phase in MIU project, (2)to obtain the mechanical data of Toki granite for the design of MIZUNAMI Underground Research Laboratory. The geomechanical investigations in MIU-2 borehole were carried out in 1999 and the major reverse fault called Tukiyoshi fault approximately intersected at 900m depth in MIU-2 borehole. The investigations consist of three parts: (1)Laboratory tests for the mechanical properties of rock matrix. (2)Stress measurement in laboratory with AE method. (3)In-situ stress measurement with hydraulic fracturing. This report is described on the results of geomechanical investigations in MIU-2 borehole. Additinally, the integration of the results of the geological, geophysical and geomechanical investigations in AN-1, MIU-1 and MIU-2 is attempted to establish a geomechanical conceptual model in Toki granite. The results are summarized as follows: *In MIU-2 borehole, the distribution of each properties for Toki granite has different trend with each section, where are until 400m, from 400 to 600m, from 600m to 900 and over 900m. The difference of the rock mechanical properties over 900m is possible to be due to mechanical damage when Tukiyoshi fault was formed. The results of the seismic velocity measurements of the cores in two dimension show that a little anisotropy (the range is 5 to 20 percents) of rock matrix is detected and the gap of degree of anisotropy was found at 600m depth. The result of three dimensional seismic velocity measurement on rock matrix suggested that three major axis of the anisotropy are perpendicular each other and the axises are vertical and horizontal approximately. *In MIU-2 borehole, the ...
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JAERI-M 83-146, 29 Pages, 1983/09
no abstracts in English
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Japanese Journal of Applied Physics, 22(11), p.1709 - 1716, 1983/00
Times Cited Count：7 Percentile：42.52(Physics, Applied)no abstracts in English
