Design of a new time-of-flight small-angle neutron scattering instrument at CPHS

Gong, H.; Shao, B.B.; Wang, D.; Zhang, X.Z.; Zhang, K.; Wei, J.; Wang, X.W.; Guan, Xialing; Loong, C.‐K.; Tao, J.; Zhou, Liang; Ke, Yubin

doi:10.1016/j.nima.2011.12.018

Cited by 13 publications

(7 citation statements)

References 5 publications

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“…For a large source size and small pinhole size, a distribution of pinholes based on a hexagonal array pattern is most widely used since it maximizes the number of pinholes in a given area (Chaboussant et al, 2012;Brû let et al, 2008;Dé sert et al, 2007). However, for the CPHS-SANS instrument, since the size of the moderator source is 11 Â 11 cm, while Q min is set at approximately 0.007 Å À1 (Huang et al, 2012), the best pinhole distribution is a nine-pinhole structure which forms a square array. Compared with a seven-pinhole structure with a hexagonal array (Glinka et al, 1986), the nine-pinhole structure with a square shape increases the beam intensity by a ratio of 9:7 in the case of uniform source distribution for a larger sample size.…”

Section: Crosstalk Of a Multi-pinhole Collimation Systemmentioning

confidence: 99%

“…Although the Q resolution and Q min are both important parameters that ensure the availability of a suitable Q range for the detailed examination of the structure of a sample, the beam intensity, which is equal to the product of the flux at the sample and the sample size, is crucial since it determines the measurement time required to achieve good statistics during sample analysis. The Compact Pulsed Hadron Source (CPHS) at Tsinghua University is a proton accelerator based neutron source (Wang et al, 2014;Huang et al, 2012). As a compact source, the neutron flux delivered is much lower than that of other large sources.…”

Section: Introductionmentioning

confidence: 99%

“…Unlike the multi-slit collimation, the multipinhole collimation is suitable for application to two-dimensional Q structures when the sample is anisotropic. The multipinhole collimation system was finally chosen for the CPHS-SANS instrument since it can increase the beam intensity with large samples while facilitating better statistics, in addition to achieving a comparable Q min and Q resolution to the singlepinhole collimation SANS instrument (Huang et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Study of a multi-pinhole collimation system based small-angle neutron scattering instrument at the Compact Pulsed Hadron Source

Wang

Chen

et al. 2018

J Appl Cryst

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The neutron flux of the Compact Pulsed Hadron Source (CPHS) is about 2–3 orders of magnitude lower than that of large neutron sources, which means that the beam intensity should be improved to achieve good statistics. Multi‐pinhole collimation can be used to obtain a lower Q with an acceptable beam intensity in a very small angle neutron scattering (VSANS) instrument and a higher beam intensity for a larger sample size in a small‐angle neutron scattering (SANS) instrument. A new nine‐pinhole structure is used in a SANS instrument at CPHS to achieve an acceptable range and resolution of Q and a higher beam intensity compared to single‐pinhole collimation. The crosstalk issue associated with multi‐pinhole collimation is addressed using an optimized algorithm to achieve a higher safety margin and a larger pinhole size with a higher beam intensity at the sample. Different collimator aperture structures are compared on the basis of their noise production. Experiments are performed to verify the theory of calculating reflection noise from the inner surface of the collimator's aperture and parasitic noise from the beveled collimator structure. From a simulated SANS experiment using cold neutrons in the SANS instrument, it is clarified that multi‐pinhole collimators with an opening angle on the downstream side have better performance than those with an opening angle on the upstream side and straight‐cut collimators. Compared with a single‐pinhole collimation system, a nine‐pinhole collimation system increases the intensity at the sample by approximately sevenfold when the sample size is increased by 20‐fold for CPHS‐SANS, and the signal‐to‐noise ratio is improved by exploiting a specific collimator aperture structure. Our goal is to install a multi‐pinhole collimator based SANS instrument at CPHS in the future, and it is hoped that these results will serve to promote the utilization of multi‐pinhole collimation systems at other facilities.

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Section: Crosstalk Of a Multi-pinhole Collimation Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of a multi-pinhole collimation system based small-angle neutron scattering instrument at the Compact Pulsed Hadron Source

Wang

Chen

et al. 2018

J Appl Cryst

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“…We plan to resolve these technical issues step-by-step, beginning with 3-MeV protons on a water-cooled, thin Be target with a room-temperature polyethylene moderator and gradually gain experiences for reliable operation and extend to higher proton energies and cold-neutron production. [4] Two neutron beams are to be built for imaging-the NIRS and small-angle scattering-the SANS. This corresponds to two PhD thesis projects, respectively, for S. F. Su of Sun Yat-Sen University and T.C.…”

Section: Neutron Target Stationmentioning

confidence: 99%

Delivery of 3-MeV Proton and Neutron Beams at CPHS: A Status Report on Accelerator and Neutron Activities at Tsinghua University

et al. 2014

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The Compact Pulsed Hadron Source (CPHS) project that was launched in September 2009 at Tsinghua University has reached a first commissioning stage in conjunction with on-going activities to fulfill the eventual design goal of a ~10 13 n/s epithermal-to-cold neutron yield for education, instrumentation development, and industrial applications. Here, we report the latest progress on the design, fabrication, engineering of the 13 MeV/16 kW proton accelerator system, the neutron target station and neutron beamlines, especially regarding the successful delivery of the first 3-MeV proton beam and the realization of the first neutron generation in 2013.

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“…Figure 1 shows the setup of the IS, LEBT, and RFQ segments. [Huang et al (2012)] Two neutron beams are to be built for imagingthe NIRS and small-angle scatteringthe SANS. This corresponds to two PhD thesis projects, respectively, for S. F. Su of Sun Yat-Sen University and T.C.…”

Section: Progress In 2010-2012mentioning

confidence: 99%

Recent Progress of the Compact Pulsed Hadron Source Project and Related Activities at Tsinghua University

et al. 2014

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Design of a new time-of-flight small-angle neutron scattering instrument at CPHS

Cited by 13 publications

References 5 publications

Study of a multi-pinhole collimation system based small-angle neutron scattering instrument at the Compact Pulsed Hadron Source

Study of a multi-pinhole collimation system based small-angle neutron scattering instrument at the Compact Pulsed Hadron Source

Delivery of 3-MeV Proton and Neutron Beams at CPHS: A Status Report on Accelerator and Neutron Activities at Tsinghua University

Recent Progress of the Compact Pulsed Hadron Source Project and Related Activities at Tsinghua University

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