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Journal Articles

Repetition Rate Multiplication: RRM, an advanced measuring method planed for the backscattering instrument, ${it DNA}$ at the MLF, J-PARC

Takahashi, Nobuaki; Shibata, Kaoru; Kawakita, Yukinobu; Nakajima, Kenji; Inamura, Yasuhiro; Nakatani, Takeshi; Nakagawa, Hiroshi; Fujiwara, Satoru; Sato, Taku*; Tsukushi, Itaru*; et al.

Journal of the Physical Society of Japan, 80(Suppl.B), p.SB007_1 - SB007_4, 2011/12

 Times Cited Count:5 Percentile:40.61(Physics, Multidisciplinary)

Journal Articles

AMATERAS; A Cold-neutron disk chopper spectrometer

Nakajima, Kenji; Kawamura, Seiko; Kikuchi, Tatsuya; Nakamura, Mitsutaka; Kajimoto, Ryoichi; Inamura, Yasuhiro; Takahashi, Nobuaki; Aizawa, Kazuya; Suzuya, Kentaro; Shibata, Kaoru; et al.

Journal of the Physical Society of Japan, 80(Suppl.B), p.SB028_1 - SB028_6, 2011/05

 Times Cited Count:101 Percentile:94.89(Physics, Multidisciplinary)

AMATERAS is a cold-neutron disk-chopper spectrometer in MLF, J-PARC. The construction of main part of the spectrometer has been completed in spring of 2009. Soon after that, we have started the commissioning work on AMATERAS. The performance of AMATERAS has been examined by test experiments in the course of commissioning. In parallel to these works, we have started the user program on AMATERAS from December 2009 and we are getting scientific results from our spectrometer. In this presentation, we will report the current status of AMATERAS including the results of performance tests and some of examples of scientific outputs.

Journal Articles

A Novel time-spatial-focusing momentum-correction analyzer for the near-backscattering spectrometer DIANA at J-PARC

Takahashi, Nobuaki; Shibata, Kaoru; Sato, Taku*; Arai, Masatoshi; Mezei, F.*

Nuclear Instruments and Methods in Physics Research A, 587(2-3), p.350 - 362, 2008/03

 Times Cited Count:2 Percentile:22.93(Instruments & Instrumentation)

We have developed a novel configuration concept of crystal-chips for a time-of-flight (TOF) crystal-analyzer neutron inelastic scattering spectrometer, which simultaneously achieves time-focusing, spatial-focusing and momentum-correcting abilities. This concept will be adopted to a coming TOF near-backscattering spectrometer, DIANA which has been proposed to construct at Japan Proton Accelerator Research Complex (J-PARC). At first, layout method satisfying both of the time- and spatial-focusing concepts and momentum-correction concept have been introduced briefly, and then, the focusing performances have been evaluated by Monte-Carlo simulations. Simulations have been performed on a generally-used energy-focusing analyzer as a comparison.

Journal Articles

Instrumental design and expected performance of coupled-moderator near-backscattering spectrometer at J-PARC

Takahashi, Nobuaki; Shibata, Kaoru; Sato, Taku*; Tamura, Itaru; Kajimoto, Ryoichi; Harjo, S.; Oikawa, Kenichi; Arai, Masatoshi; Mezei, F.*

Journal of Physics and Chemistry of Solids, 68(11), p.2199 - 2203, 2007/11

 Times Cited Count:7 Percentile:36.42(Chemistry, Multidisciplinary)

A near-backscattering crystal-analyzer neutron inelastic spectrometer, DIANA has been proposed to construct at Materials and Life Science Facility (MLF) of Japan Proton Accelerator Research Complex (J-PARC). It has firstly been designed to see a decoupled non-poisoned moderator in order to obtain higher intensity and better energy resolution. In deed, the decoupled moderator has a narrower pulse width than a coupled moderator, and so it will give us a better energy resolution. However, the peak neutron flux of the decoupled moderator has only a half of the coupled moderator. In order to decide the best choice of this type of near-backscattering instruments, we have reconsidered instrumental parameters including the type of moderators. We have performed Monte-Carlo neutron ray-tracing simulations, using McStas and have compared these results in various viewpoints such as intensities, resolutions, shape of resolution functions, scan ranges and so on.

Oral presentation

Design of focusing-analyzer for a inverse geometry ToF spectrometer

Takahashi, Nobuaki; Shibata, Kaoru; Sato, Taku*; Arai, Masatoshi; Mezei, F.*

no journal, , 

no abstracts in English

Oral presentation

Study of energy resolution function on near-backscattering spectrometer DIANA

Shibata, Kaoru; Takahashi, Nobuaki; Sato, Taku*; Kawakita, Yukinobu*; Nakajima, Kenji; Arai, Masatoshi; Mezei, F.*

no journal, , 

no abstracts in English

Oral presentation

A New time-focusing crystal configuration for an inverted-geometry TOF spectrometer

Takahashi, Nobuaki; Shibata, Kaoru; Sato, Taku*; Arai, Masatoshi; Mezei, F.*

no journal, , 

An inverted-geometry neutron inelastic spectrometer, DIANA has been proposed for the Materials and Life Science Facility (MLF) of Japan Proton Accelerator Research Complex (J-PARC). It has been planned to have three crystal analyzer-banks, pyrolytic graphite PG(002), Ge(311) and Si(111) at near-backscattering configurations to study dynamics of biomolecules and proteins in wide energy transfer and momentum transfer ranges. In general, layout of small crystal-chips on an analyzer-bank is crucial for inverted-geometry spectrometers. We have developed a novel configuration concept of crystal-chips for inverted-geometry TOF spectrometers, which simultaneously achieves time-focusing, spatial-focusing and momentum-correcting abilities. This concept was adopted for the planned spectrometer, DIANA. In the conference, we will discuss the new analyzer layout, and then, will show the focusing performances as evaluated by Monte-Carlo simulations using McStas.

Oral presentation

Performance evaluation of cold-neutron disk-chopper spectrometer AMATERAS

Nakajima, Kenji; Kawamura, Seiko; Nakamura, Mitsutaka; Kajimoto, Ryoichi; Inamura, Yasuhiro; Takahashi, Nobuaki; Osakabe, Toyotaka; Wakimoto, Shuichi; Aizawa, Kazuya; Suzuya, Kentaro; et al.

no journal, , 

AMATERAS is a cold-neutron disk-chopper spectrometer newly installed at MLF, J-PARC. The spectrometer has pulse shaping chopper which can cat the source pulse shape as it is required by the experiments. By using newly developed high-speed disk-choppers, the spectrometer realizes both high energy resolution and high intensity with high flexibility in the cold and thermal neutron energy region. The construction of the spectrometer has been completed in spring of 2009. After the commissioning works, now the spectrometer is open to users. In this presentation, we will show the evaluated performances which were obtained in commissioning works.

Oral presentation

The Study of optical specification for the near backscattering Si crystal analyzer spectrometer

Shibata, Kaoru; Takahashi, Nobuaki; Nakajima, Kenji; Kawakita, Yukinobu*; Sato, Taku*; Tsukushi, Itaru*; Nakagawa, Hiroshi; Fujiwara, Satoru; Mezei, F.*; Mutka, H.*; et al.

no journal, , 

We are planning and partially beginning the construction of the near backscattering Si crystal analyzer spectrometer DNA at the Material and Life Science Facility (MLF), J-PARC. The optical specification of DNA is as follows. In the center of the vacuum chamber, a sample position is located at 42 m away form the coupled moderator. The analyzer banks of Si(111) and Si(311) single crystal wafers which are pasted on the spherical surface, are mounted at the right and left side each in the vacuum chamber. The Bragg angle of those analyzer crystals are about 87.5 deg and the distance between the sample position and the analyzer crystal is about 2.3 m. The analyzed neutron beams are detected by the $$^{3}$$Hee gas position sensitive detector located at around the sample position. Then the expected energy resolution and the dynamic range of the Si(111) crystal analyzer are about 1 micro-eV and $$pm$$ 40 micro-eV, respectively. We will report the optical principle and specification of DNA spectrometer.

Oral presentation

Commissioning of the cold-neutron disk-chopper spectrometer AMATERAS

Nakajima, Kenji; Kawamura, Seiko; Nakamura, Mitsutaka; Kajimoto, Ryoichi; Inamura, Yasuhiro; Takahashi, Nobuaki; Osakabe, Toyotaka; Wakimoto, Shuichi; Aizawa, Kazuya; Suzuya, Kentaro; et al.

no journal, , 

no abstracts in English

Oral presentation

Chopper system of DNA; A Si backscattering spectrometer at pulsed neutron source of J-PARC

Takahashi, Nobuaki; Shibata, Kaoru; Nakajima, Kenji; Arai, Masatoshi; Kawakita, Yukinobu*; Sato, Taku*; Tsukushi, Itaru*; Nakagawa, Hiroshi; Fujiwara, Satoru; Mezei, F.*; et al.

no journal, , 

no abstracts in English

Oral presentation

Commissioning of cold-neutron disk-chopper spectrometer AMATERAS

Nakajima, Kenji; Kawamura, Seiko; Nakamura, Mitsutaka; Kajimoto, Ryoichi; Inamura, Yasuhiro; Takahashi, Nobuaki; Aizawa, Kazuya; Suzuya, Kentaro; Shibata, Kaoru; Nakatani, Takeshi; et al.

no journal, , 

AMATERAS is a cold-neutron disk-chopper spectrometer newly constructed in Materials and Life science Facility in J-PARC. Construction of the spectrometer has been completed in this spring and on 27 May, 2009 AMATERAS opened its shutter for the first neutron beam. AMATERAS is now in commissioning phase and will be ready for user program from this December. In this presentation, detail of the spectrometer, results from commissioning and plan of user program will be shown.

Oral presentation

The Specification and construction schedule of the near backscattering Si crystal analyzer spectrometer, 2

Shibata, Kaoru; Takahashi, Nobuaki; Nakajima, Kenji; Kambara, Wataru; Kawakita, Yukinobu*; Sato, Taku*; Tsukushi, Itaru*; Nakagawa, Hiroshi; Fujiwara, Satoru; Mezei, F.*; et al.

no journal, , 

no abstracts in English

Oral presentation

Commissioning of AMATERAS; A Cold-neutron disk-chopper spectrometer at MLF, J-PARC

Nakajima, Kenji; Kawamura, Seiko; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Inamura, Yasuhiro; Takahashi, Nobuaki; Osakabe, Toyotaka; Wakimoto, Shuichi; Aizawa, Kazuya; Suzuya, Kentaro; et al.

no journal, , 

AMATERAS is a cold-neutron disk-chopper spectrometer in Materials and Life science Facility in J-PARC. By combination of high-peak intensity from a H$${_2}$$-coupled moderator source and newly developed high-speed disk-choppers (the maximum revolution: 350Hz, the minimum burst time: 7.6 $$mu$$sec.) for pulse shaping and monochromating, the spectrometer realizes both high-resolution ($$Delta$$$$E/Emathrm{_i}>1%$$) and high-intensity (one order of magnitude higher than the present state-of-the-art chopper spectrometers) in the range of $$Emathrm{_i}=1sim20$$ meV, and can show sufficient performance up to $$Emathrm{_i}<$$80 meV. Construction of AMTERAS has been completed in March 2009 and the spectrometer is at commissioning phase. In this presentation, we will report the current status of AMATERAS including the first results obtained at commissioning.

Oral presentation

RRM (Repetition Rate Multiplication) of the biomolecular neutron inelastic spectrometer DNA

Takahashi, Nobuaki; Shibata, Kaoru; Nakajima, Kenji; Arai, Masatoshi; Kawakita, Yukinobu*; Sato, Taku*; Tsukushi, Itaru*; Nakagawa, Hiroshi; Fujiwara, Satoru; Mezei, F.*; et al.

no journal, , 

no abstracts in English

Oral presentation

The Specification and construction schedule of the near backscattering Si crystal analyzer spectrometer DNA, 3

Shibata, Kaoru; Takahashi, Nobuaki; Kawakita, Yukinobu; Nakajima, Kenji; Inamura, Yasuhiro; Nakatani, Takeshi; Aizawa, Kazuya; Soyama, Kazuhiko; Oikawa, Kenichi; Yoshida, Noboru; et al.

no journal, , 

A Si-crystal analyzer backscattering spectrometer DNA is planned to be installed at the pulsed neutron source of the Material and Life Science Facility (MLF), J-PARC, and the construction has partially begun in the summer of 2010. The field of expected scientific research on the DNA spectrometer is very wide including the soft matter dynamics, the bio-molecular dynamics, the chemical molecular dynamics, the characterizations of the functional materials and the spin dynamics in the magnetism.

Oral presentation

Performance evaluation of cold-neutron disk-chopper spectrometer AMATERAS

Nakajima, Kenji; Kawamura, Seiko; Kikuchi, Tatsuya; Nakamura, Mitsutaka; Kajimoto, Ryoichi; Inamura, Yasuhiro; Takahashi, Nobuaki; Osakabe, Toyotaka; Wakimoto, Shuichi; Aizawa, Kazuya; et al.

no journal, , 

no abstracts in English

Oral presentation

The Construction schedule of the near backscattering Si crystal analyzer spectrometer

Shibata, Kaoru; Takahashi, Nobuaki; Kawakita, Yukinobu; Nakajima, Kenji; Kambara, Wataru; Inamura, Yasuhiro; Nakatani, Takeshi; Aizawa, Kazuya; Soyama, Kazuhiko; Oikawa, Kenichi; et al.

no journal, , 

We are beginning the construction of the near backscattering Si crystal analyzer spectrometer DNA in the pulsed neutron source of the Material and Life Science Facility (MLF) at J-PARC. This is the spectrometer to cover the area of the micro-eV energy range in the several spectrometers which are in the construction or planned the construction in MLF. The field of expected scientific research on the DNA spectrometer is very wide including the soft matter dynamics, the bio-molecular dynamics, the chemical molecular dynamics, the characterizations of the functional materials and the spin dynamics in the magnetism. We will report the present status of the construction schedule on DNA.

Oral presentation

High-resolution neutron inelastic scattering measurements prospected by DNA spectrometer

Takahashi, Nobuaki; Shibata, Kaoru; Kawakita, Yukinobu; Nakajima, Kenji; Inamura, Yasuhiro; Nakatani, Takeshi; Nakagawa, Hiroshi; Fujiwara, Satoru; Sato, Taku*; Tsukushi, Itaru*; et al.

no journal, , 

no abstracts in English

Oral presentation

AMATERAS; Cold-neutron disk-chopper spectrometer

Nakajima, Kenji; Kawamura, Seiko; Kikuchi, Tatsuya; Nakamura, Mitsutaka; Kajimoto, Ryoichi; Inamura, Yasuhiro; Takahashi, Nobuaki; Aizawa, Kazuya; Suzuya, Kentaro; Shibata, Kaoru; et al.

no journal, , 

30 (Records 1-20 displayed on this page)