Small angle neutron scattering at very high time resolution: Principle and simulations of ‘TISANE’

2008 ◽  
Vol 372 (10) ◽  
pp. 1541-1546 ◽  
Author(s):  
D. Kipping ◽  
R. Gähler ◽  
K. Habicht
Keyword(s):  
Neutron Scattering ◽  
Time Resolution ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
High Time ◽  
High Time Resolution ◽  
Resolution Principle ◽  
Very High

Toward a new lower limit for the minimum scattering vector on the very small angle neutron scattering spectrometer at Laboratoire Léon Brillouin

2008 ◽  
Vol 41 (1) ◽  
pp. 161-166 ◽  
Author(s):  
Annie Brûlet ◽  
Vincent Thévenot ◽  
Didier Lairez ◽  
Sébastien Lecommandoux ◽  
Willy Agut ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Pixel Size ◽  
Resolution Function ◽  
Incident Wavelength ◽  
Under Construction ◽  
Very High ◽  
Good Agreement ◽  
Small Pixel

The main characteristics of the very small angle neutron scattering spectrometer (VSANS) under construction at the Laboratoire Léon Brillouin are a multibeam pinhole collimator converging onto an image plate detector. By combining tiny collimation (diaphragms of around 1 or 2 mm in diameter) with the small pixel size of the detector (0.15 × 0.15 mm), very high resolution measurements can be achieved. The resolution function of the instrument contains a contribution from gravity, which is reduced by the intermediate masks of the collimator. Owing to the relatively short length of the VSANS instrument (around 14 m), this effect remains weak, in good agreement with the predictions. With a prototype multibeam collimator, an incident wavelength of 0.9 nm and the detector located at 6 m from the sample, it is possible to accessqvalues as low as 4 × 10−3 nm−1with very highqresolution. Promising preliminary experiments with highqresolution are reported, which open up new fields to the SANS technique.

A new TAC-based multichannel front-end electronics for TOF experiments with very high time resolution

2005 ◽  
Vol 52 (3) ◽  
pp. 745-747 ◽  
Author(s):  
K. Koch ◽  
H. Hardel ◽  
R. Schulze ◽  
E. Badura ◽  
J. Hoffmann
Keyword(s):  
Time Resolution ◽  
High Time ◽  
High Time Resolution ◽  
Front End ◽  
Very High

scholarly journals Fourier Analysis of Radio Bursts Observed with Very High Time Resolution

Solar Physics ◽  
2014 ◽  
Vol 290 (1) ◽  
pp. 169-180 ◽  
Author(s):  
B. P. Da̧browski ◽  
M. Karlický ◽  
P. Rudawy
Keyword(s):  
Fourier Analysis ◽  
Time Resolution ◽  
High Time ◽  
High Time Resolution ◽  
Radio Bursts ◽  
Very High

scholarly journals Microsecond polarimetry of the repeating FRB 20180916B

2020 ◽  
Author(s):  
Kenzie Nimmo ◽  
Jason Hessels ◽  
Aard Keimpema ◽  
Anne Archibald ◽  
James Cordes ◽  
...  
Keyword(s):  
Time Resolution ◽  
Position Angle ◽  
High Time ◽  
Dispersion Measure ◽  
High Time Resolution ◽  
Radio Bursts ◽  
Signal To Noise ◽  
Propagation Effects ◽  
Local Medium ◽  
Very High

Abstract Fast radio bursts (FRBs) exhibit a wide variety of spectral, temporal and polarimetric properties, which can unveil clues into their emission physics and propagation effects in the local medium. FRBs are challenging to study at very high time resolution due to the precision needed to constrain the dispersion measure, signal-to-noise limitations, and also scattering from the intervening medium. Here we present the high-time-resolution (down to 1 μs) polarimetric properties of four 1.7-GHz bursts from the repeating FRB 20180916B, which were detected in voltage data during observations with the European VLBI Network. In these bursts we observe a range of emission timescales spanning three orders of magnitude, the shortest component width reaching 3-4 μs (below which we are limited by scattering). We demonstrate that all four bursts are highly linearly polarised (≥ 80%), show no evidence for significant circular polarisation (≤ 15%), and exhibit a constant polarisation position angle during and between bursts. On short timescales (≤ 100 μs), however, there appear to be subtle (few degree) polarisation position angle variations across the burst profiles. These observational results are most naturally explained in an FRB model where the emission is magnetospheric in origin, as opposed to models where the emission originates at larger distances in a relativistic shock.

scholarly journals Sub-millisecond time-resolved small-angle neutron scattering measurements at NIST

2020 ◽  
Vol 53 (3) ◽  
pp. 598-604 ◽  
Author(s):  
Charles Glinka ◽  
Markus Bleuel ◽  
Peter Tsai ◽  
Dominika Zákutná ◽  
Dirk Honecker ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Time Resolution ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
High Speed ◽  
Magnetic Particles ◽  
Time Resolved ◽  
Periodic Stimulus ◽  
Scattering Measurements ◽  
Reorientation Dynamics

Instrumentation for time-resolved small-angle neutron scattering measurements with sub-millisecond time resolution, based on Gähler's TISANE (time-involved small-angle neutron experiments) concept, is in operation at NIST's Center for Neutron Research. This implementation of the technique includes novel electronics for synchronizing the neutron pulses from high-speed counter-rotating choppers with a periodic stimulus applied to a sample. Instrumentation details are described along with measurements demonstrating the utility of the technique for elucidating the reorientation dynamics of anisometric magnetic particles.

scholarly journals Aqueye and Iqueye, Very-High-Time-Resolution Photon-Counting Photometers

2011 ◽  
Vol 7 (S285) ◽  
pp. 280-282
Author(s):  
Cesare Barbieri ◽  
Giampiero Naletto ◽  
Luca Zampieri ◽  
Enrico Verroi ◽  
Serena Gradari ◽  
...  
Keyword(s):  
Time Resolution ◽  
Arrival Time ◽  
Dynamic Range ◽  
Crab Nebula ◽  
Photon Counting ◽  
High Time ◽  
High Time Resolution ◽  
Definition Of ◽  
The Crab Nebula ◽  
Very High

AbstractWe describe very high-time-resolution photometers capable of tagging the arrival time of each photon with a resolution and accuracy of few hundred picoseconds, for hours of continuous acquisition, and with a dynamic range of more than 6 orders of magnitude. The final goal is the conceptual definition of a “quantum” photometer for the E-ELT, capable of detecting and measuring second-order correlation effects in photon streams from celestial sources. Two prototype units have been built and operated, one for the Asiago 1.8-m telescope (AquEYE) and one for the 3.5-m NTT (IquEYE).Here we will present results obtained by IquEYE on the Crab Nebula pulsar in simultaneous radio observations with Jodrell Bank in December 2009.

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