Possibility of high efficient beam extraction from the CERN SPS with a bent crystal. Simulation results

2017 ◽  
Vol 848 ◽  
pp. 166-169 ◽  
Author(s):  
W. Scandale ◽  
A.D. Kovalenko ◽  
A.M. Taratin
Keyword(s):  
Beam Extraction ◽  
Bent Crystal ◽  
High Efficient ◽  
Simulation Results

Study on Thermal Elongation Error of Whirlwind Hard Milling Ballscrew

2013 ◽  
Vol 589-590 ◽  
pp. 221-226
Author(s):  
Yan Feng Li ◽  
Xian Chun Song ◽  
Hong Kui Jiang ◽  
Xiang Rong Xu
Keyword(s):  
Temperature Distribution ◽  
Distribution Pattern ◽  
Measured Temperature ◽  
Hard Milling ◽  
Environmental Technology ◽  
Dynamic Temperature ◽  
Pitch Error ◽  
High Efficient ◽  
Simulation Results ◽  
Screw Pitch

Whirlwind hard milling is a new high-efficient and environmental technology for maching process ballscrew thread. Thermal elongation of the workpiece in processing is one of the main reasons causing the screw-pitch error. The screw-pitch error due to thermal elongation caused by milling heat were analyzed . The dynamic temperature distribution simulation and thermal elogation of the workpiece were carried out with ANSYS software.Compared the simulation results with measured temperature during processing of the workpiece,the temperature distribution pattern is consistent.The result indicate that the law of thermal elongation of the free end and unprocessed section of ballscrew simulated by ANSYS is helpful to compensate screw-pitch error caused by thermal elogation.

scholarly journals Combined Experimental and Monte-Carlo Ray-Tracing Approach for Optimizing Light Extraction in LED COB Modules

ISRN Optics ◽  
2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Marianne Consonni ◽  
Julien Routin ◽  
Anthony Piveteau ◽  
Adrien Gasse
Keyword(s):  
Ray Tracing ◽  
Intensity Distribution ◽  
High Power ◽  
Light Extraction ◽  
Thermal Dissipation ◽  
Dissipation Potential ◽  
Light Emitting ◽  
High Efficient ◽  
Simulation Results ◽  
The Impact

High-power light-emitting diodes (LEDs) for lighting applications require a high-efficient packaging to optimize their performances. Due to its high thermal dissipation potential, the chip-on-board (COB) technology is widely used for developing high-power lighting sources. In order to optimize the optical properties of such sources and to propose high optically efficient encapsulation geometry, ray-tracing simulations have been performed. The impact of the shape and volume of the silicone encapsulation on the light extraction and on the intensity distribution of the module was derived. Then, simulation results were correlated with experimental measurements on blue light-emitting COB sources. It is shown that a nearly hemispherical encapsulation with a minimal volume of 5 to 10 mm3 for a 1 mm2 LED die is the optimal configuration regarding both the light extraction and the intensity distribution.

scholarly journals CRYSTAL COLLIMATION STUDIES AT THE TEVATRON (T-980)

2010 ◽  
Vol 25 (supp01) ◽  
pp. 98-105 ◽  
Author(s):  
N.V. MOKHOV ◽  
G.E. ANNALA ◽  
A. APYAN ◽  
R.A. CARRIGAN ◽  
A.I. DROZHDIN ◽  
...  
Keyword(s):  
Proton Beam ◽  
System Performance ◽  
Superconducting Magnets ◽  
Silicon Crystal ◽  
High Energy ◽  
Experimental Setup ◽  
Beam Diagnostics ◽  
Bent Crystal ◽  
Beam Halo ◽  
Simulation Results

Bent-crystal channeling is a technique with a potential to increase beam-halo collimation efficiency in high-energy colliders. First measurements at the Tevatron in 2005 have shown that using a thin silicon crystal to deflect the 1-TeV proton beam halo onto a secondary collimator improves the system performance by reducing the machine impedance, beam losses in the collider detectors and irradiation of the superconducting magnets, all in agreement with simulations. Recent results, obtained with an improved goniometer and enhanced beam diagnostics, are reported here for dedicated beam studies and first full collider stores along with simulation results and plans for substantial enhancement of the T-980 experimental setup.

scholarly journals High-Efficient Syndrome-Based LDPC Reconciliation for Quantum Key Distribution

Entropy ◽  
2021 ◽  
Vol 23 (11) ◽  
pp. 1440
Author(s):  
Hao-Kun Mao ◽  
Yu-Cheng Qiao ◽  
Qiong Li
Keyword(s):  
Quantum Key Distribution ◽  
Information Leakage ◽  
Key Distribution ◽  
Channel Noise ◽  
Low Density ◽  
Parity Check ◽  
Promising Technique ◽  
Low Density Parity Check ◽  
High Efficient ◽  
Simulation Results

Quantum key distribution (QKD) is a promising technique to share unconditionally secure keys between remote parties. As an essential part of a practical QKD system, reconciliation is responsible for correcting the errors due to the quantum channel noise by exchanging information through a public classical channel. In the present work, we propose a novel syndrome-based low-density parity-check (LDPC) reconciliation protocol to reduce the information leakage of reconciliation by fully utilizing the syndrome information that was previously wasted. Both theoretical analysis and simulation results show that our protocol can evidently reduce the information leakage as well as the number of communication rounds.

scholarly journals A Novel High Gain Voltage-Lift Technique Based Transformer free Non-isolated Quadratic Boost Converter

2018 ◽  
Vol 225 ◽  
pp. 04010
Author(s):  
Pydikalva Padmavathi ◽  
Sudhakar Natarajan
Keyword(s):  
Theoretical Analysis ◽  
Simple Structure ◽  
High Gain ◽  
Boost Converter ◽  
Constant Frequency ◽  
Boost Converters ◽  
High Efficient ◽  
Voltage Stress ◽  
Simulation Results ◽  
Lower Voltage

A novel high gain voltage lift technique based transformer free non isolated boost converter is proposed with single switch operating at constant frequency in this paper. This performance of this converter is very good and high efficient compared to the conventional boost converters. The high gain is obtained by applying voltage lift cell to the quadratic boost converter. The simple structure, easy controlling and lower voltage stress. The operating principle with theoretical analysis and simulation results of proposed converter for various loads at 10 kHz frequency are discussed in this paper to compare the performance of this novel boost converter.

scholarly journals High efficiency multi-pass proton beam extraction with a bent crystal at the SPS

1995 ◽  
Vol 357 (4) ◽  
pp. 671-677 ◽  
Author(s):  
X. Altuna ◽  
M.P. Bussa ◽  
G. Carboni ◽  
B. Dehning ◽  
K. Elsener ◽  
...  
Keyword(s):  
Proton Beam ◽  
High Efficiency ◽  
Beam Extraction ◽  
Bent Crystal

scholarly journals On the energy dependence of proton beam extraction with a bent crystal

1998 ◽  
Vol 422 (1-4) ◽  
pp. 325-333 ◽  
Author(s):  
G. Arduini ◽  
K. Elsener ◽  
G. Fidecaro ◽  
M. Gyr ◽  
W. Herr ◽  
...  
Keyword(s):  
Proton Beam ◽  
Energy Dependence ◽  
Beam Extraction ◽  
Bent Crystal

A New Scintillator Geometry for Positronium Time of Flight Measurement

2012 ◽  
Vol 733 ◽  
pp. 330-333
Author(s):  
Xiao Pan Jiang ◽  
Xing Zhong Cao ◽  
Run Sheng Yu ◽  
Zhuo Xin Li ◽  
Peng Zhang ◽  
...  
Keyword(s):  
Detection Efficiency ◽  
Time Of Flight ◽  
Novel Technique ◽  
Efficient Detection ◽  
High Efficient ◽  
Positronium Annihilation ◽  
Flight Measurement ◽  
Γ Rays ◽  
Γ Ray ◽  
Simulation Results

The positronium time of flight (Ps-TOF) spectroscopy is a novel technique for studying the microstructure in porous materials, in which the high-efficient detection of γ rays generated from ortho-positronium annihilation is the key point for the apparatus setup. In this paper, a new geometry of the scintillator was proposed to improve the γ ray detection efficiency which was indicated by the 22.1% promotion using the simulation results.

scholarly journals CU Splitting on Frame Boundary for Arbitrary Resolution Video in HEVC

2011 ◽  
Vol 1 ◽  
pp. 116-120
Author(s):  
Wei Li ◽  
Fu Zheng Yang ◽  
Shu Ai Wan ◽  
Guang Liang Ren
Keyword(s):  
Video Coding ◽  
Splitting Method ◽  
Video Content ◽  
Integral Multiple ◽  
Coding Efficiency ◽  
High Efficient ◽  
Simulation Results ◽  
Coding Unit ◽  
Efficient Video ◽  
Candidate Set

A highly flexible quadtree structure has been introduced in the latest high efficient video coding (HEVC) to efficiently represent video content. However, the performance of the quadtre structure would be impaired when the video resolution is not an integral multiply of the largest coding unit (CU). To address this, a new CU splitting method on the frame boundary for arbitrary resolution video is proposed to improve the coding efficiency of HEVC. This method introduces the non-square CU to extend the CU candidate set on the frame boundary when the video resolution is not an integral multiple of the largest CU size. Simulation results show that the proposed method can reduce the coding bit rate by up to 0.76% compared with the original TMuC 0.9 reference software.

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