[en] Concluding remarks: • Concerning the p-Be RANS source, we have established a powerful simulation system for neutron field and associated reaction environment at RANS. Currently, a precise neutron yield determination system is under installation by introducing a Solar panel detector to give absolute neutron production data. • Concerning the p-Li RANS-II source, although there is reasonable agreement between simulation and experiment, still we do need to do deep analysis by taking account of the proton beam profile. •For the development of “Accelerator-driven “compact” neutron systems”, the lack of nuclear data with accelerated proton beam is a serious issue in the world.

[en] A temperature and pressure control system of the KEK 1-m hydrogen bubble chamber has been converted from a conventional analogue system to a Direct Digital Control System (DDC) using a minicomputer YODIC 100. The system has two operation modes. The ''cooling mode'' of the DDC system (mode I) enables us to automatically cool the chamber down to 45 K with a desired cooling rate. The ''constant operation control mode'' (mode II) can keep the fluctuation of the temperature and the pressure of the chamber to within +-0.02 K and +-0.02 kg/cm², respectively. The constitution and the performances of the DDC system are described. (author)

[en] We have constructed new beam-line 'MINE' at the cold neutron guide C3-1-2 of JRR-3M for our multilayer cold neutron interferometer experiments. The 'MINE' employs quadruple (++++) joined multilayer mirrors called 'QUAD' as its monochromator. The 'QUAD' supplies monochromatized long wave length (≥12A) neutron beam. This beam is also available for neutron reflectometers. (author)

[en] As an RF power source system for a future X-band linear colliders, some RF pulse compression system is necessary. A new simple scheme which can provide the better efficiency than the present scheme such as SLED or SLED-2, is proposed. This scheme consist of 2-Klystrons, a 3-dB coupler and a TE01 mode delay line one half of the necessary delay time. The output RF pulse of 2-klystrons are combined through 3-dB coupler and the first half of the pulse is transported to the upstream of a linac through the TE01 mode wave guide. Then, by reversing the phase of the one of 2-klystrons, the last half of the RF pulse is directly fed to the linac structure located close to the klystrons. The RF power loss in this system is determined by the loss in the transporting waveguide. In the case of 400nsec pulse. ie 200nsec pulses at the input of 2-different accelerating structures, the estimated efficiency is more than 95%. (author)

[en] Purpose: To address the challenges of image quality, radiation dose, and reconstruction speed in intraoperative cone-beam CT (CBCT) for neurosurgery by combining model-based image reconstruction (MBIR) with accelerated algorithmic and computational methods. Methods: Preclinical studies involved a mobile C-arm for CBCT imaging of two anthropomorphic head phantoms that included simulated imaging targets (ventricles, soft-tissue structures/bleeds) and neurosurgical procedures (deep brain stimulation (DBS) electrode insertion) for assessment of image quality. The penalized likelihood (PL) framework was used for MBIR, incorporating a statistical model with image regularization via an edgepreserving penalty. To accelerate PL reconstruction, the ordered-subset, separable quadratic surrogates (OS-SQS) algorithm was modified to incorporate Nesterov's method and implemented on a multi-GPU system. A fair comparison of image quality between PL and conventional filtered backprojection (FBP) was performed by selecting reconstruction parameters that provided matched low-contrast spatial resolution. Results: CBCT images of the head phantoms demonstrated that PL reconstruction improved image quality (∼28% higher CNR) even at half the radiation dose (3.3 mGy) compared to FBP. A combination of Nesterov's method and fast projectors yielded a PL reconstruction run-time of 251 sec (cf., 5729 sec for OS-SQS, 13 sec for FBP). Insertion of a DBS electrode resulted in severe metal artifact streaks in FBP reconstructions, whereas PL was intrinsically robust against metal artifact. The combination of noise and artifact was reduced from 32.2 HU in FBP to 9.5 HU in PL, thereby providing better assessment of device placement and potential complications. Conclusion: The methods can be applied to intraoperative CBCT for guidance and verification of neurosurgical procedures (DBS electrode insertion, biopsy, tumor resection) and detection of complications (intracranial hemorrhage). Significant improvement in image quality, dose reduction, and reconstruction time of ∼4 min will enable practical deployment of low-dose C-arm CBCT within the operating room. AAPM Research Seed Funding (2013-2014); NIH Fellowship F32EB017571; Siemens Healthcare (XP Division)

[en] Neutron characteristics of C3-1-2 beam port at JRR3M reactoer of JAERI are described. The C3-1-2 port provides long wavelength nomochromatic and well collimated neutron beam for a multilayer interferometer and a reflectometer, the former of which is installed at the rear part of the C3-1-2 port and the latter at the front part of the port. The multilayer interferometer are applicated to very cold neutron and used for fundamental physical research mainly. The reflectometer used researches of precise neutron optics, polymer science and hydrogen behavier in thin layer. (author)

No abstract available

No abstract available

[en] Development of a TE11 mode X-band RF window capable above RF pulses of 100 MW, 1μs, is underway to realize a X-band high-power klystron for JLC. This paper describes design and a high-power test for the window which comprises TE10(WRJ-10)-TE11 mode(WC-5) converters, circular waveguide tapers and a alumina ceramic with a circular wave guide frame. Evaluation circuit method and numerical calculations were used for the design. The result of the test using a resonant ring has been successfully carried out with the circulating power of '100 MW, 300 ns'. (author)

[en] A novel type of cold-neutron interferometer based on a pair of new devices named 'beam splitting etalons (BSE)' has been developed. The parallelism between the two planes in each BSE and the equality of gap thicknesses of the two BSEs ensure the alignment of four independent multilayer mirrors in the interferometer within the precision required by the three-dimensional coherency of the beam. Various arrangements of BSEs enables us to build new types of coherent optical systems for cold neutrons