Production of ultra cold neutrons by a doppler shifter with pulsed neutrons at J-PARC

Mishima, Kenji; Imajo, Shusaku; Hino, Masahiro; Ichihara, T.; Iwashita, Yoshihisa; Katayama, Ryo; Kitaguchi, Masaaki; Oda, Takuya; Shimizu, Hirohiko M.; Utsuro, Masahiko; Yamashita, Shinji; Yoshioka, Tamaki

doi:10.1088/1742-6596/528/1/012030

Cited by 9 publications

(13 citation statements)

References 8 publications

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“…Historically the first method of the UCN spectroscopy was the time-of-flight technique [1]. As a direct and universal method of measuring the neutron speed, it has been successfully used in numerous experiments with UCN (see for example [2][3][4][5][6]). …”

Section: Introductionmentioning

confidence: 99%

Time-of-flight Fourier UCN spectrometer

Kulin

Frank

Goryunov

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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We describe a new time-of-flight Fourier spectrometer for investigation of UCN diffraction by a moving grating. The device operates in the regime of a discrete set of modulation frequencies. The results of the first experiments show that the spectrometer may be used for obtaining UCN energy spectra in the energy range of 60÷200 neV with a resolution of about 5 neV. The accuracy of determination of the line position was estimated to be several units of 10 −10 eV

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Section: Introductionmentioning

confidence: 99%

Time-of-flight Fourier UCN spectrometer

Kulin

Frank

Goryunov

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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“…14. In the experiment, the neutron Doppler shifter we have developed was used for a UCN source [16,17]. The Doppler shifter produces pulsed UCNs with 4.4-ms FWHM and 8.33-Hz frequency.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Ultracold Neutron Time Focusing Experiment and Performance Evaluation of an Improved UCN Rebuncher at J-PARC/MLF

Imajo

Iwashita

Mishima

et al. 2021

Proceedings of the 3rd J-Parc Symposium (J-Parc2019)

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We have developed and improved an ultracold neutron (UCN) decelerator named "UCN rebuncher." The rebuncher can give continuously changing deceleration to pulsed polarized UCNs by the combination of an adiabatic fast passage spin flipper, a frequency sweeping resonator, and a gradient magnetic field. By using this apparatus, we can control the longitudinal velocity of UCNs and time-focus UCNs on an arbitrary point. In a neutron electric dipole moment measurement at a spallation pulsed superthermal UCN source with a solid deuterium converter, the apparatus makes it possible to recover the spatial density of diffusing pulsed UCNs and store them in a cell efficiently. We carried out the UCN focus experiment with the improved rebuncher at BL05 (NOP) in J-PARC/MLF. We succeeded in decelerating 5.5-m/s UCNs, focusing them on the detection timing of 4.8-m/s UCNs, and confirming an obvious peak in the time-of-flight spectrum. The count rate at the peak was 2.2 times higher than without the rebuncher.

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“…In particular, this is a very promising device for the blade mirror of a Doppler shifter [20]. The incident angle to the mirror is almost 901, and the waviness of the mirror is negligible.…”

Section: Large Flexible Self-standing Multilayer Sheetmentioning

confidence: 99%

“…3(a). The d-spacing at maximum intensity was 2.89 nm, and the reflectivity was higher than 0.4 and was actually used as a key device of a Doppler shifter for the production of ultra-cold neutrons [20]. The total number of layers for the monochromator was 85060.…”

Section: Introductionmentioning

confidence: 99%

The ion beam sputtering facility at KURRI: Coatings for advanced neutron optical devices

Hino

Oda

Kitaguchi

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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a b s t r a c tWe describe a film coating facility for the development of multilayer mirrors for use in neutron optical devices that handle slow neutron beams. Recently, we succeeded in fabricating a large neutron supermirror with high reflectivity using an ion beam sputtering system (KUR-IBS), as well as all neutron supermirrors in two neutron guide tubes at BL06 at J-PARC/MLF. We also realized a large flexible selfstanding m¼5 NiC/Ti supermirror and very small d-spacing (d ¼1.65 nm) multilayer sheets. In this paper, we present an overview of the performance and utility of non-magnetic neutron multilayer mirrors fabricated with the KUR-IBS

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Production of ultra cold neutrons by a doppler shifter with pulsed neutrons at J-PARC

Cited by 9 publications

References 8 publications

Time-of-flight Fourier UCN spectrometer

Time-of-flight Fourier UCN spectrometer

Ultracold Neutron Time Focusing Experiment and Performance Evaluation of an Improved UCN Rebuncher at J-PARC/MLF

The ion beam sputtering facility at KURRI: Coatings for advanced neutron optical devices

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