scholarly journals Development of a Neutron Imaging Station at the n_TOF Facility of CERN and Applications to Beam Intercepting Devices

Instruments ◽  
2019 ◽  
Vol 3 (2) ◽  
pp. 32 ◽  
Author(s):  
Federica Mingrone ◽  
Marco Calviani ◽  
Claudio Torregrosa Martin ◽  
Oliver Aberle ◽  
Michael Bacak ◽  
...  
Keyword(s):  
Neutron Beam ◽  
Neutron Radiography ◽  
Beam Line ◽  
Neutron Imaging ◽  
Experimental Results ◽  
Detection Systems ◽  
Experimental Area ◽  
Shortest Distance ◽  
Antiproton Production ◽  
Imaging Setup

A neutron radiography testing station has been developed exploiting the neutron beam of CERN’s n_TOF Experimental Area 2, located at the shortest distance to the neutron producing-target. The characteristics of the n_TOF neutron beam for the imaging setup are presented in this paper, together with the obtained experimental results. The results focused on the testing of several particle producing targets, including a spent antiproton production targets as well as targets from two different HiRadMat’s experiments. The possible developments of neutron imaging capabilities of the n_TOF facility in terms of detection-systems and beam-line upgrades are as well outlined.

scholarly journals Neutron imaging at the n_TOF facility of CERN

2020 ◽  
Vol 239 ◽  
pp. 01042
Author(s):  
◽  
M. Bacak ◽  
F. Mingrone ◽  
M. Calviani ◽  
C. Torregrosa Martin ◽  
...  
Keyword(s):  
Neutron Beam ◽  
Neutron Radiography ◽  
Beam Line ◽  
Neutron Imaging ◽  
Experimental Results ◽  
Imaging Setup

A neutron radiography station has been developed at the n_TOF facility of CERN. The characteristics of the neutron beam line and the imaging setup are presented in this paper together with first experimental results. A comparison of two different collimation systems is discussed and further improvements and upgrades are outlined.

scholarly journals ANTARES: Cold neutron radiography and tomography facility

2015 ◽  
Vol 1 ◽  
Author(s):  
Michael Schulz ◽  
Burkhard Schillinger
Keyword(s):  
High Resolution ◽  
Neutron Beam ◽  
Cold Neutron ◽  
Neutron Radiography ◽  
Pinhole Camera ◽  
Neutron Imaging ◽  
High Flux ◽  
Beam Port ◽  
Cold Neutron Beam

The neutron imaging facility ANTARES, operated by the Technische Universität München, is located at the cold neutron beam port SR-4a. Based on a pinhole camera principle with a variable collimator located close to the beam port, the facility provides the possibility for flexible use in high resolution and high flux imaging.

Automatic Ship Routing with High Reliability and Efficiency between Two Arbitrary Points at Sea

2018 ◽  
Vol 72 (2) ◽  
pp. 430-446
Author(s):  
Shuaidong Jia ◽  
Zeyuan Dai ◽  
Lihua Zhang
Keyword(s):  
Binary Tree ◽  
High Reliability ◽  
Spatial Database ◽  
Experimental Results ◽  
Ship Routing ◽  
Shortest Distance ◽  
Tree Index ◽  
Tree Method

Due to the limitations of the existing methods (for example, the route binary tree method) that can only automatically generate routes based on a single chart, a method for automatically generating the shortest distance route based on an obstacle spatial database is proposed. Using this proposed method, the route between two arbitrary points at sea can be automatically generated. First, the differences in accuracy and updating time of charts are quantitatively analysed. Next, the mechanism for updating obstacles is designed, an obstacle spatial database is constructed, and the obstacle data extracted from multiple charts are fused. Finally, considering the effect of efficiency on the amount of obstacle data, a route window and an improved R-tree index are designed for quickly extracting and querying the obstacle database. The experimental results demonstrate that compared with existing methods, the proposed method can generate the shortest distance between two arbitrary points at sea and eliminates the limitation of the area of the chart. In addition, with data from multiple charts, the route generated by the proposed method is more reliable than that of the existing methods, and it is more efficient.

Neutron Optics

2020 ◽  
pp. 311-342
Author(s):  
Andrew T. Boothroyd
Keyword(s):  
Neutron Radiography ◽  
Scattering Length ◽  
Diffraction Theory ◽  
Neutron Imaging ◽  
Bragg Diffraction ◽  
Neutron Reflectivity ◽  
Neutron Optics ◽  
Coherent Wave ◽  
Optical Phenomena ◽  
Secondary Extinction

The description of neutron optical phenomena within the framework of dynamical diffraction theory is described. The coherent wave and optical potential are introduced, and an expression for the complex neutron refractive index in terms of the scattering length density and attenuation coefficient is obtained. The extension to magnetic media and polarized neutrons is covered. Neutron reflectivity is defined, and the wavevector dependence of the reflectivity profile is derived by a transfer matrix method and an optical method. Exact results are compared with the Born approximation. The technique of neutron imaging is described, including neutron radiography and computed tomography. Several optical phenomena that occur in Bragg diffraction from near-perfect crystals, including Pendellösung oscillations, and primary and secondary extinction.

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