Use of a Drabkin spin resonator in inverted geometry neutron time-of-flight spectroscopy

Badurek, G.; Kollmar, A.; Seeger, A.; Schalt, W.

doi:10.1016/0168-9002(91)90112-4

Cited by 15 publications

(4 citation statements)

References 9 publications

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“…A thorough theoretical treatment of spatial neutron spin resonance is given in 33 . By running the resonator in a pulsed mode a novel inverted-geometry time-of-flight spectrometer for pulsed neutron sources could be realized, which allowed to perform energy transfer scans without changing the scattering angle 34 . A similar arrangement could be used to demonstrate neutron time-of-flight focusing 35 .…”

Section: Monopol -A Traveling-wave Magnetic Neutron Spin Resonator Fomentioning

confidence: 99%

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MONOPOL - A traveling-wave magnetic neutron spin resonator for tailoring polarized neutron beams

Jericha¹,

Gösselsberger²,

Abele³

et al. 2020

Sci Rep

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time resolution will no longer be limited by the total length of the resonator but only by that of one half-period, without any deterioration of the achievable wavelength resolution. An appealing feature of this novel concept is that in principle both of these resolutions can be changed not only separately but also almost instantaneously by purely electronic means, provided an appropriate, inevitably rather complex circuitry is used for this purpose. In recent years we have developed several prototypes of neutron spin resonators with independent elements, able to be operated in such a traveling-wave mode. The first experimental tests at the 250 kW low flux TRIGA research reactor of our university in Vienna could be performed only with a dichromatic beam of thermal neutrons delivered from 1 st and 2 nd order (002)-reflection of a highly oriented pyrolytic graphite (HOPG) monochromator. Nevertheless these experiments allowed us to improve the resonator performance step-by-step from one prototype to the next and to demonstrate that our proposed concept is indeed useful for flexible neutron beam property tailoring. The most advanced of these prototypes, named MONOPOL 3.1, was designed and optimized for installation at the PF2-VCN beam line at the high-flux reactor of the ILL Grenoble, where it could be tested for the first time with a 'white' neutron beam, in this specific case of very cold neutrons. Since the basics of our traveling-wave concept of spatial spin resonance have already been published 39-42 , in what follows we will focus on the description of the essential constructional features of this resonator prototype and on the results of the first experiments. Details of the dedicated electronics which we have developed to run MONOPOL will be described in a forthcoming paper.

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Section: Monopol -A Traveling-wave Magnetic Neutron Spin Resonator Fomentioning

confidence: 99%

“…As mentioned already in the introduction, spatial neutron spin resonance has been well-understood for some time, and is thoroughly discussed in the literature [32][33][34][35] . Therefore we just give a very brief summary of its theoretical basics.…”

Section: Basic Principlementioning

confidence: 99%

MONOPOL - A traveling-wave magnetic neutron spin resonator for tailoring polarized neutron beams

Jericha¹,

Gösselsberger²,

Abele³

et al. 2020

Sci Rep

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“…The difference is that the adiabatic spin rotation is accomplished by passing the neutron beam through an arrangement of current sheets that create a spatially oscillating magnetic field instead of an RF field. For TOF operation, the guide field coils and the current sheets need to be operated with ramped currents [103,104]. Depending on the number of current sheets, the flipper can be made to be wavelength selective ðdE=E , 1%Þ:…”

Section: 25mentioning

confidence: 99%

Polarized neutrons for pulsed neutron sources

Anderson¹,

Cook

Felcher³

et al. 2005

GNER

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“…It extracts polarized monochromatic neutrons: the Drabkin resonator flips the spin of neutrons with a particular wavelength by means of spatial neutron spin resonance and the polarization analyzer extracts the spin-flipped beam. Since the resonant wavelength depends on the strength of the periodical magnetic field in the Drabkin resonator, pulse shaping is achieved by varying the field strength in synchronization with the time-of-flight from the source [8]. The wavelength resolution of the resonant spinflip is inversely proportional to the number of the period of magnetic field in the resonator, N, which could be controlled electronically.…”

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confidence: 99%

Drabkin Energy Filter for Pulse Shaping and Energy Analysis

Yamazaki¹,

Soyama²,

Ebisawa³

et al. 2005

Journal of Neutron Research

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We have been developing Drabkin energy filters for pulse shaping and energy analysis at the J-PARC spallation neutron source. By installing two Drabkin energy filters in sequence (a double Drabkin filter), subsidiary peaks of the resonant spin-flip are suppressed and pulse shaping could be performed more effectively. In this contribution, simulation results of pulse shaping by a double Drabkin filter for the J-PARC moderators are presented.Pulse shaping is essential in order to perform high-resolution experiments at a pulsed neutron source. Choppers are often used for pulse shaping but they extract only a small range of wavelength and stop most of the neutrons from the moderator. A Drabkin energy filter could reduce the pulse width without the expense of band width and with the small reduction of pulse peak height [1 -5].A Drabkin energy filter is composed of a neutron polarizer, a Drabkin resonator [6,7], a spin p-flipper and a polarization analyzer. It extracts polarized monochromatic neutrons: the Drabkin resonator flips the spin of neutrons with a particular wavelength by means of spatial neutron spin resonance and the polarization analyzer extracts the spin-flipped beam. Since the resonant wavelength depends on the strength of the periodical magnetic field in the Drabkin resonator, pulse shaping is achieved by varying the field strength in synchronization with the time-of-flight from the source [8]. The wavelength resolution of the resonant spinflip is inversely proportional to the number of the period of magnetic field in the resonator, N, which could be controlled electronically.The spin-flip probability as a function of wavelength has subsidiary maxima more than 0.1 near the resonant peak, which deteriorate the efficiency of pulse shaping. But, the subsidiary maxima could be reduced by modulated magnetic fields or by installing several Drabkin energy filters in sequence [7,9]. Here, we call a system with two Drabkin energy filters installed in sequence a "double Drabkin filter". In this paper, simulation results of pulse shaping for JSNS by a double Drabkin filter are presented and discussed.

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Use of a Drabkin spin resonator in inverted geometry neutron time-of-flight spectroscopy

Cited by 15 publications

References 9 publications

MONOPOL - A traveling-wave magnetic neutron spin resonator for tailoring polarized neutron beams

MONOPOL - A traveling-wave magnetic neutron spin resonator for tailoring polarized neutron beams

Polarized neutrons for pulsed neutron sources

Drabkin Energy Filter for Pulse Shaping and Energy Analysis

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