scholarly journals AEgIS at ELENA: outlook for physics with a pulsed cold antihydrogen beam

2018 ◽  
Vol 376 (2116) ◽  
pp. 20170274 ◽  
Author(s):  
M. Doser ◽  
S. Aghion ◽  
C. Amsler ◽  
G. Bonomi ◽  
R. S. Brusa ◽  
...  
Keyword(s):  
Charge Exchange ◽  
High Efficiency ◽  
Efficient Production ◽  
Radial Compression ◽  
Gravitational Acceleration ◽  
Technical Developments ◽  
Direct Measurements ◽  
Production Scheme ◽  
Antihydrogen Production ◽  
Near Future

The efficient production of cold antihydrogen atoms in particle traps at CERN’s Antiproton Decelerator has opened up the possibility of performing direct measurements of the Earth’s gravitational acceleration on purely antimatter bodies. The goal of the AEgIS collaboration is to measure the value of g for antimatter using a pulsed source of cold antihydrogen and a Moiré deflectometer/Talbot–Lau interferometer. The same antihydrogen beam is also very well suited to measuring precisely the ground-state hyperfine splitting of the anti-atom. The antihydrogen formation mechanism chosen by AEgIS is resonant charge exchange between cold antiprotons and Rydberg positronium. A series of technical developments regarding positrons and positronium (Ps formation in a dedicated room-temperature target, spectroscopy of the n =1–3 and n =3–15 transitions in Ps, Ps formation in a target at 10 K inside the 1 T magnetic field of the experiment) as well as antiprotons (high-efficiency trapping of , radial compression to sub-millimetre radii of mixed plasmas in 1 T field, high-efficiency transfer of to the antihydrogen production trap using an in-flight launch and recapture procedure) were successfully implemented. Two further critical steps that are germane mainly to charge exchange formation of antihydrogen—cooling of antiprotons and formation of a beam of antihydrogen—are being addressed in parallel. The coming of ELENA will allow, in the very near future, the number of trappable antiprotons to be increased by more than a factor of 50. For the antihydrogen production scheme chosen by AEgIS, this will be reflected in a corresponding increase of produced antihydrogen atoms, leading to a significant reduction of measurement times and providing a path towards high-precision measurements. This article is part of the Theo Murphy meeting issue ‘Antiproton physics in the ELENA era’.

scholarly journals Measuring $\bar{g}$ with ${\rm AE\bar{g}IS}$, progress and perspectives

2014 ◽  
Vol 30 ◽  
pp. 1460262 ◽  
Author(s):  
D. Krasnický ◽  
S. Aghion ◽  
O. Ahlén ◽  
C. Amsler ◽  
A. Ariga ◽  
...  
Keyword(s):  
Production Method ◽  
Current Status ◽  
Gravity Measurement ◽  
Gravitational Acceleration ◽  
Short Term ◽  
Relative Precision ◽  
Weak Equivalence Principle ◽  
Experimental Apparatus ◽  
Antihydrogen Production ◽  
Near Future

[Formula: see text] experiment's main goal is to measure the local gravitational acceleration of antihydrogen [Formula: see text] and thus perform a direct test of the weak equivalence principle with antimatter. In the first phase of the experiment the aim is to measure [Formula: see text] with 1% relative precision. This paper presents the antihydrogen production method and a description of some components of the experiment, which are necessary for the gravity measurement. Current status of the [Formula: see text] experimental apparatus is presented and recent commissioning results with antiprotons are outlined. In conclusion we discuss the short-term goals of the [Formula: see text] collaboration that will pave the way for the first gravity measurement in the near future.

scholarly journals Friction-Induced Recycling Process for User-Specific Semi-Finished Product Production

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 663
Author(s):  
Thomas Borgert ◽  
Werner Homberg
Keyword(s):  
High Efficiency ◽  
Research Work ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Efficient Production ◽  
Secondary Aluminum ◽  
Shape Accuracy ◽  
Aluminum Chips ◽  
Spinning Process ◽  
Complex Parts

Modern forming processes often allow today the efficient production of complex parts. In order to increase the sustainability of forming processes it would be favorable if the forming of workpieces becomes possible using production waste. At the Chair of Forming and Machining Technology of the Paderborn University (LUF) research is presently conducted with the overall goal to produce workpieces directly from secondary aluminum (e.g., powder and chips). Therefore, friction-based forming processes like friction spinning (or cognate processes) are used due to their high efficiency. As a pre-step, the production of semi-finished parts was the subject of accorded research work at the LUF. Therefore, a friction-based hot extrusion process was used for the full recycling or rework of aluminum chips into profiles. Investigations of the recycled semi-finished products show that they are comparable to conventionally produced semi-finished products in terms of dimensional stability and shape accuracy. An analysis of the mechanical properties of hardness and tensile strength shows that a final product with good and homogeneously distributed properties can be produced. Furthermore, significant correlations to the friction spinning process could be found that are useful for the above-mentioned direct part production from secondary aluminum.

An Exergy-Based Analysis of Temperature Profiles for an Over-Pressure Reflow Oven Technology

2015 ◽  
Author(s):  
Alireza Esfandyari ◽  
Aarief Syed-Khaja ◽  
Torben Landskrone ◽  
Joerg Franke
Keyword(s):  
Lead Time ◽  
High Efficiency ◽  
New Technologies ◽  
Rate Increase ◽  
Efficient Production ◽  
Temperature Profiles ◽  
Production Lines ◽  
Electronics Assembly ◽  
Set Up

In electronics assembly, the convection based soldering technologies in the production lines consumes massive resources and energy. The recent advancements in soldering technologies consume comparatively higher resources and needs to be optimized for resource efficient production which is also the motivation for the present work. This study is devoted to quantify the resource consumption and qualify this consumption through exergy flows in an over-pressure reflow technology as an energy intensive process in electronics manufacturing. The analysis implies on a big saving potential for energy consumption specifically during the over-pressure process which also defines the void reduction quality of solder joints. Exergy efficiency is the fraction of the work potential of the heat that is converted to work, and it illustrates the quality of consumed resources during the soldering oven process. Shortening the production lead-time, and increasing the production rate increase the efficiency of exergy and prevents wastage of usable energy. Furthermore, the set-up improvements for the temperature profiles are necessary, and the changes toward developing new technologies in pre-heating and over-pressure chamber zones are mandatory if a high efficiency of resources used is expected.

scholarly journals Feasibility of mini combined cycles for naval applications

2018 ◽  
Vol 245 ◽  
pp. 07008 ◽  
Author(s):  
Dario Barsi ◽  
Carlo Costa ◽  
Francesca Satta ◽  
Pietro Zunino ◽  
Vitaly Sergeev
Keyword(s):  
Energy Production ◽  
High Efficiency ◽  
Combined Cycle ◽  
Pollutant Emissions ◽  
Large Power ◽  
Combined Use ◽  
Combined Cycles ◽  
Definition Of ◽  
The Individual ◽  
Near Future

The objective of energy production with low environmental impact will have, in the near future, high potential of development also for naval applications. The containment of pollutant emissions can be achieved by the combined use of an innovative mini gas-steam combined cycle with thermal energy cogeneration to feed the ship thermal utilities, in place of the current Diesel engine application, and liquefied natural gas as fuel (LNG). The present work is focused on the definition of the architecture of the plant, by selecting optimal distribution of pressure and temperature and repartition of power between Gas Turbine (GT), Steam Turbine (ST) and thermal utilities, as well as on the choice and sizing of the individual components. The main purpose is the definition of a compact, high efficiency, system. The proposed basic mini-cycle ranges from 2 MW to 10 MW electric power. Thanks to the combined heat and power cogeneration plant adopted, for an overall electrical efficiency of about 30%, a total return (thermal + electricity) of about 75% can be achieved. An example of plant providing large power, in a partially modular arrangement is also proposed.

Research on Electric Linear Compressor for New Energy Vehicles

2011 ◽  
Vol 383-390 ◽  
pp. 5470-5473
Author(s):  
Yan Shi ◽  
Zong Li Li
Keyword(s):  
High Efficiency ◽  
Research Work ◽  
Structure Design ◽  
Low Friction ◽  
Compact Structure ◽  
Linear Compressor ◽  
New Energy ◽  
Air Brake System ◽  
Near Future ◽  
New Energy Vehicles

New energy vehicles have bright prospect in the near future. In new energy vehicles some parts which are driven by engine through transmission will be replaced by electric drive, such as refrigeration compressor used for air conditioning and air compressor used for air brake system. Because of advantages, such as high efficiency, low friction, compact structure, and so on, linear compressor is suitable to solve above problems. In this paper a novel electric linear compressor is presented. Research work, such as simulation, structure design, control design, has been done. Further experiments are being done by my research team. We believe that electric linear compressor is worthy of being researched to popularize new energy vehicles.

High Quality Al-Ga-In-N Heterostructures Fabricated by MOVPE Growth in Multiwafer Reactors

1997 ◽  
Vol 2 ◽  
Author(s):  
D. Schmitz ◽  
R. Beccard ◽  
O. Schoen ◽  
R. Niebuhr ◽  
B. Wachtendorf ◽  
...  
Keyword(s):  
High Efficiency ◽  
Optical Quality ◽  
Efficient Production ◽  
Acceptor Doping ◽  
Thickness Uniformity ◽  
Si Doping ◽  
Compositional Uniformity ◽  
Wavelength Variation ◽  
Better Than

We present results on the growth of Al-Ga-In-N films in multiwafer reactors with 7×2″ wafer capacity. The design of these reactors allows the combination of high efficiency (TMGa efficiency for GaN around 30%) and excellent uniformity. Results on the growth of all materials from the Al-Ga-In-Nitride family are presented in detail. GaN is grown with an excellent optical quality and very good thickness uniformity below 2% across 2″ wafers. The material quality is shown by electron mobility of more than 500 cm2/Vs at an intentional Si-doping of approximately 1×1017 cm−3. Controlled acceptor doping with Mg yields carrier concentrations between 5×1016 and 1018 cm−3. The layer thickness uniformity of the films are better than 2% over a 2″ wafer area. GaInN is grown with PL emission wavelengths in the visible blue region showing a uniformity better than 1.5 nm standard deviation. The film thickness uniformity represents the same figures as obtained for the binary. The compositional uniformity of AlGaN is in the sub 1% range corresponding to a wavelength variation below 1 nm.The fabrication of heterostructures from these binary and ternary materials is described as well as results from the characterization of these structures. The results show that reliable and efficient production of Al-Ga-In-Nitride based optoelectronic devices can be performed in multiwafer reactors.

scholarly journals Research on the Current Situation and Development of Fuel Cell Powered Transportation

2021 ◽  
Vol 242 ◽  
pp. 02007
Author(s):  
Hao Su
Keyword(s):  
Fuel Cell ◽  
Large Scale ◽  
High Efficiency ◽  
Cell System ◽  
Low Noise ◽  
Maritime Industry ◽  
Fuel Cell System ◽  
Emission Level ◽  
New Type ◽  
Near Future

Traditional oil consumed transportation including vehicles and vessel produces green house gases, which is not environmentally-friendly. As a new type of energy-consumed unit, the fuel cell is popular due to its less emission level, high efficiency and low noise. This paper introduces the principle and characteristics of fuel cell, with further introduction to the application status of fuel cell system in the vehicle and maritime industry. Further aspects that need to be improved will be discussed and analyzed, in order to promote fuel cell system in transportation area in a large scale. It can be clearly seen that various factors (infrastructure, cost, durability, etc.) should be considered in the near future.

scholarly journals People-as-a-Service Dilemma: Humanizing Computing Solutions in High-Efficiency Applications

Proceedings ◽  
2019 ◽  
Vol 31 (1) ◽  
pp. 39 ◽  
Author(s):  
Bordel ◽  
Alcarria ◽  
Hernández ◽  
Robles
Keyword(s):  
High Efficiency ◽  
Service Providers ◽  
Efficient Production ◽  
Physical Systems ◽  
Generation Computing ◽  
New Process ◽  
Simulation Scenario ◽  
Process Execution ◽  
Total Capacity ◽  
Physical Elements

Next-generation computing solutions, such as cyber-physical systems or Industry 4.0, are focused on increasing efficiency in process execution as much as possible. Removing unproductive delays or keeping infrastructures operating at their total capacity are typical objectives in these future systems. Decoupling infrastructure providers and service providers using Anything-as-a-Service (XaaS) paradigms is one of the most common approaches to address this challenge. However, many real scenarios not only include machines or controllers but also people and workers. In this case, deploying process execution algorithms and XaaS solutions degenerates in a People-as-a-Service scenario, which poses a critical dilemma: Can highly efficient production scenarios guarantee people’s wellbeing? In this paper, we address this problem and propose a new process execution algorithm based on a novel understanding of efficiency. In this case, a humanized efficiency definition combining traditional efficiency ratios and wellbeing indicators is used to allocate tasks and assign them to different existing workers. In order to evaluate the proposed solution, a simulation scenario including social and physical elements was built. Using this scenario, a first experimental validation was carried out.

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