Real-time spot size measurement for pulsed high-energy radiographic machines

2002 ◽  
Author(s):  
S.A. Watson
Keyword(s):  
Real Time ◽  
Spot Size ◽  
High Energy ◽  
Size Measurement

scholarly journals Experimental comparison of various techniques for spot size measurement of high-energy X-ray

2016 ◽  
Vol 40 (8) ◽  
pp. 086205
Author(s):  
Yi Wang ◽  
Qin Li ◽  
Nan Chen ◽  
Jin-Ming Cheng ◽  
Cheng-Gang Li ◽  
...  
Keyword(s):  
Spot Size ◽  
High Energy ◽  
Experimental Comparison ◽  
Size Measurement ◽  
X Ray

scholarly journals Neutrino Astronomy with IceCube

2016 ◽  
Vol 12 (S324) ◽  
pp. 322-329
Author(s):  
Kevin J. Meagher
Keyword(s):  
Real Time ◽  
Gamma Ray ◽  
Galactic Plane ◽  
Galactic Nuclei ◽  
High Energy ◽  
Glacial Ice ◽  
Astrophysical Neutrinos ◽  
Charged Secondary ◽  
Neutrino Astronomy ◽  
The Antarctic

AbstractThe IceCube Neutrino Observatory is a cubic kilometer neutrino telescope located at the Geographic South Pole. Cherenkov radiation emitted by charged secondary particles from neutrino interactions is observed by IceCube using an array of 5160 photomultiplier tubes embedded between a depth of 1.5 km to 2.5 km in the Antarctic glacial ice. The detection of astrophysical neutrinos is a primary goal of IceCube and has now been realized with the discovery of a diffuse, high-energy flux consisting of neutrino events from tens of TeV up to several PeV. Many analyses have been performed to identify the source of these neutrinos: correlations with active galactic nuclei, gamma-ray bursts, and the galactic plane. IceCube also conducts multi-messenger campaigns to alert other observatories of possible neutrino transients in real-time. However, the source of these neutrinos remains elusive as no corresponding electromagnetic counterparts have been identified. This proceeding will give an overview of the detection principles of IceCube, the properties of the observed astrophysical neutrinos, the search for corresponding sources (including real-time searches), and plans for a next-generation neutrino detector, IceCube–Gen2.

scholarly journals Single-Shot Electro-Optic Sampling on the Temporal Structure of Laser Wakefield Accelerated Electrons

Crystals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 640
Author(s):  
Kai Huang ◽  
Hideyuki Kotaki ◽  
Michiaki Mori ◽  
Yukio Hayashi ◽  
Nobuhiko Nakanii ◽  
...  
Keyword(s):  
Real Time ◽  
Temporal Structure ◽  
High Energy ◽  
High Energy Particle ◽  
Single Shot ◽  
Generation Process ◽  
Laser Wakefield Acceleration ◽  
Wakefield Acceleration ◽  
Electro Optic ◽  
Laser Wakefield

Particle acceleration driven by a high power Ti: sapphire laser has invoked great interest worldwide because of the ultrahigh acceleration gradient. For the aspect of electron acceleration, electron beams with energies over GeV have been generated using the laser wakefield acceleration mechanism. For the optimization of the electron generation process, real-time electron parameter monitors are necessary. One of the key parameters of a high energy particle beam is the temporal distribution, which is closely related with the timing resolution in a pump-probe application. Here, we introduced the electro-optic sampling method to laser wakefield acceleration. Real-time multibunch structures were observed. Careful calculations on the physical processes of signal generation in an electro-optic crystal were performed. Discussions of the methodology are elaborated in detail.

scholarly journals Real-Time Energy Efficient Hand Pose Estimation: A Case Study

Sensors ◽  
2020 ◽  
Vol 20 (10) ◽  
pp. 2828
Author(s):  
Mhd Rashed Al Koutayni ◽  
Vladimir Rybalkin ◽  
Jameel Malik ◽  
Ahmed Elhayek ◽  
Christian Weis ◽  
...  
Keyword(s):  
Neural Network ◽  
Real Time ◽  
Pose Estimation ◽  
Energy Efficient ◽  
Graphics Processing Units ◽  
Estimation Algorithm ◽  
High Energy ◽  
Estimation Methods ◽  
Hand Pose Estimation ◽  
Hand Pose

The estimation of human hand pose has become the basis for many vital applications where the user depends mainly on the hand pose as a system input. Virtual reality (VR) headset, shadow dexterous hand and in-air signature verification are a few examples of applications that require to track the hand movements in real-time. The state-of-the-art 3D hand pose estimation methods are based on the Convolutional Neural Network (CNN). These methods are implemented on Graphics Processing Units (GPUs) mainly due to their extensive computational requirements. However, GPUs are not suitable for the practical application scenarios, where the low power consumption is crucial. Furthermore, the difficulty of embedding a bulky GPU into a small device prevents the portability of such applications on mobile devices. The goal of this work is to provide an energy efficient solution for an existing depth camera based hand pose estimation algorithm. First, we compress the deep neural network model by applying the dynamic quantization techniques on different layers to achieve maximum compression without compromising accuracy. Afterwards, we design a custom hardware architecture. For our device we selected the FPGA as a target platform because FPGAs provide high energy efficiency and can be integrated in portable devices. Our solution implemented on Xilinx UltraScale+ MPSoC FPGA is 4.2× faster and 577.3× more energy efficient than the original implementation of the hand pose estimation algorithm on NVIDIA GeForce GTX 1070.

Self-modulated wakefield acceleration in a centimetre self-guiding channel

2012 ◽  
Vol 78 (4) ◽  
pp. 433-440 ◽  
Author(s):  
C. KAMPERIDIS ◽  
C. BELLEI ◽  
N. BOURGEOIS ◽  
M. C. KALUZA ◽  
K. KRUSHELNICK ◽  
...  
Keyword(s):  
Focal Spot ◽  
Spot Size ◽  
High Energy ◽  
Energy Spectra ◽  
Focal Spot Size ◽  
Electron Bunches ◽  
Gas Jets ◽  
Wakefield Acceleration ◽  
Helium Gas ◽  
Broad Energy

AbstractSelf-modulated wakefield acceleration was investigated at densities down to ~4 × 1018 cm−3 by propagating the 50 TW 300 fs LULI laser in helium gas jets at lengths up to 1 cm. Long interaction lengths were achieved by closer matching of the initial focal spot size to the matched spot size for these densities. Electrons with energies extending to 180 MeV were observed in broad energy spectra which show some evidence for non-Maxwellian features at high energy. Two-dimensional PIC simulations indicate that the intial laser pulse breaks up into small pulselets that are eventually compressed and focused inside the first few plasma periods, leading to a ‘bubble-like’ acceleration of electron bunches.

Erratum: Reply to Comment on ‘Fundamental mode spot-size measurement in single-mode optical fibres’

1982 ◽  
Vol 18 (21) ◽  
pp. 936
Author(s):  
F. Alard ◽  
L. Jeunhomme ◽  
M. Monerie ◽  
P. Sansonetti ◽  
C. Vassallo
Keyword(s):  
Fundamental Mode ◽  
Single Mode ◽  
Spot Size ◽  
Optical Fibres ◽  
Size Measurement
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