Numerical Analysis of the Measurement of Near-Beam Electron Cloud Density in Field-Free Region at KEK B-Factory Low-Energy Ring

2010 ◽  
Vol 49 (11) ◽  
pp. 116403 ◽  
Author(s):  
Puneet Jain ◽  
Hitoshi Fukuma ◽  
Ken-ichi Kanazawa ◽  
Yusuke Suetsugu
Keyword(s):  
Numerical Analysis ◽  
Electron Cloud ◽  
Low Energy ◽  
Beam Electron ◽  
Free Region ◽  
Field Free Region ◽  
B Factory ◽  
Cloud Density

Progress in preparation and characterization of silylene iron, cobalt and nickel complexes

2021 ◽  
Author(s):  
Wenjing Yang ◽  
Yanhong Dong ◽  
Hongjian Sun ◽  
Xiaoyan Li
Keyword(s):  
Nickel Complexes ◽  
Electron Cloud ◽  
Synthesis And Characterization ◽  
Iron Cobalt ◽  
Cloud Density ◽  
Cobalt And Nickel

The synthesis and characterization of Fe, Co and Ni complexes supported by silylene ligands in recent ten years are summarized. Due to the decrease of electron cloud density on Si...

scholarly journals Correction to: Electron Cloud Density Generated by Microring-Embedded Nano-Grating System

Plasmonics ◽  
2020 ◽  
Vol 15 (6) ◽  
pp. 2225-2225
Author(s):  
M. Bunruangses ◽  
P. Youplao ◽  
I. S. Amiri ◽  
N. Pornsuwancharoen ◽  
S. Punthawanunt ◽  
...  
Keyword(s):  
Electron Cloud ◽  
Cloud Density

Effect of cesium on H− production in a field free region of a volume source

1998 ◽  
Vol 69 (2) ◽  
pp. 974-976 ◽  
Author(s):  
M. Nishiura ◽  
M. Sasao ◽  
M. Wada
Keyword(s):  
Volume Source ◽  
Free Region ◽  
Field Free Region

Synthesis, resolution, derivatization and antibacterial activity of chuangxinmycin

2019 ◽  
Vol 11 (22) ◽  
pp. 2877-2890
Author(s):  
Lianqi Sun ◽  
Shuo Zhang ◽  
Xinyue Hu ◽  
Jie Jin ◽  
Zhuorong Li
Keyword(s):  
Escherichia Coli ◽  
Antibacterial Activity ◽  
Inhibitory Concentration ◽  
Antibacterial Activities ◽  
Electron Cloud ◽  
Preparative Chromatography ◽  
Novel Synthesis ◽  
Novel Structures ◽  
And Staphylococcus Aureus ◽  
Cloud Density

Aim: An urgent need for the development of antibiotics with novel structures and unexploited targets. Materials & methods: Racemic chuangxinmycin was obtained via a novel synthesis route. Chiral preparative chromatography was used to separate chuangxinmycin from its epimers, and four stereoisomers were obtained. Fourteen derivatives were synthesized and their antibacterial activities were evaluated against Escherichia coli and Staphylococcus aureus. Results: Synthesized (3 S, 4 R)-chuangxinmycin showed antibacterial activity against S. aureus with minimum inhibitory concentration of 4–8 μg/ml (17.2–34.3 μM), which were consistent with the antibacterial activity of chuangxinmycin obtained by fermentation. The minimum inhibitory concentrations of other stereoscopic chuangxinmycin species and chuangxinmycin derivatives were >128 μg/ml. Conclusion: Results indicate that the antibacterial activity of chuangxinmycin is dependent on the stereoselectivity of structures, and that the electron cloud density and amphipathic properties of chuangxinmycin have little effect on its antibacterial activity.

scholarly journals The ASACUSA antihydrogen and hydrogen program: results and prospects

2018 ◽  
Vol 376 (2116) ◽  
pp. 20170273 ◽  
Author(s):  
C. Malbrunot ◽  
C. Amsler ◽  
S. Arguedas Cuendis ◽  
H. Breuker ◽  
P. Dupre ◽  
...  
Keyword(s):  
Ground State ◽  
Hyperfine Splitting ◽  
Atomic Spectroscopy ◽  
Standard Model Extension ◽  
Production Region ◽  
Free Region ◽  
Model Extension ◽  
The Standard Model ◽  
Field Free Region ◽  
Antihydrogen Production

The goal of the ASACUSA-CUSP collaboration at the Antiproton Decelerator of CERN is to measure the ground-state hyperfine splitting of antihydrogen using an atomic spectroscopy beamline. A milestone was achieved in 2012 through the detection of 80 antihydrogen atoms 2.7 m away from their production region. This was the first observation of ‘cold’ antihydrogen in a magnetic field free region. In parallel to the progress on the antihydrogen production, the spectroscopy beamline was tested with a source of hydrogen. This led to a measurement at a relative precision of 2.7×10 −9 which constitutes the most precise measurement of the hydrogen hyperfine splitting in a beam. Further measurements with an upgraded hydrogen apparatus are motivated by CPT and Lorentz violation tests in the framework of the Standard Model Extension. Unlike for hydrogen, the antihydrogen experiment is complicated by the difficulty of synthesizing enough cold antiatoms in the ground state. The first antihydrogen quantum states scan at the entrance of the spectroscopy apparatus was realized in 2016 and is presented here. The prospects for a ppm measurement are also discussed. This article is part of the Theo Murphy meeting issue ‘Antiproton physics in the ELENA era’.

scholarly journals Maps for electron cloud density in Large Hadron Collider dipoles

2007 ◽  
Vol 10 (11) ◽  
Author(s):  
T. Demma ◽  
S. Petracca ◽  
F. Ruggiero ◽  
G. Rumolo ◽  
F. Zimmermann
Keyword(s):  
Large Hadron Collider ◽  
Hadron Collider ◽  
Electron Cloud ◽  
Cloud Density

Field-Free Region (FFR)

2016 ◽  
Author(s):  
Kermit K. Murray ◽  
Robert K. Boyd ◽  
Marcos N. Eberlin ◽  
G. John Langley ◽  
Liang Li ◽  
...  
Keyword(s):  
Free Region ◽  
Field Free Region

Synthesis and properties of an electron-ion plasma

1961 ◽  
Vol 264 (1318) ◽  
pp. 355-366
Keyword(s):  
Plasma Frequency ◽  
Electron Velocity ◽  
Signal Frequency ◽  
Electric Signal ◽  
Lithium Aluminium ◽  
Ion Plasma ◽  
Free Region ◽  
Field Free Region ◽  
Field Lines ◽  
Singly Charged

It is shown that a low-density neutral plasma in a steady state, consisting of electrons and ions only, can be obtained by injecting opposing beams of charges into a field-free region. With the aid of electrostatic probes the electric neutrality of such a synthetic plasma can be controlled. Experiments were carried out with a plasma consisting of singly charged lithium ions of energy up to 300 eV drawn from a lithium-aluminium silicate emitter and electrons of energy 12 to 24 eV drawn from a dispenser cathode. The residual gas pressure was kept so low that collision with atoms did not contribute to the effects measured. A continuous electric signal of frequency 2 to 30 Mc/s was transmitted through the plasma. Whereas in a gaseous plasma a resonance peak at the plasma frequency was found by varying either the signal frequency or the discharge current (and thus the plasma frequency), a resonance absorption was recorded in an electron-ion plasma. This suggests that for frequencies lower than that corresponding to an individual electron crossing the region of influence of the signal the phase of the electron oscillation always tends to reduce the local field. As the electron velocity was raised the magnitude of absorption was shown to grow. The transmission in the electron-ion plasma was also studied with a magnetic field parallel to the direction of the beams which caused the electrons to circulate about the field lines. By varying the field strength the absorption was found to reach a maximum when the electron cyclotron frequency equals the plasma frequency. The width of the absorption curves for the electron-ion plasma was greater than that with an electron beam only. The interaction between ions and electrons has been demonstrated by measuring the electric noise produced by the plasma. For electron energies between 10 and 70 eV the increase in noise corresponds to a change of the electron temperature by 400 to 500 °K or to an average scattering angle of 1 to 3°.

scholarly journals Positron extraction to an electromagnetic field free region

2015 ◽  
Vol 49 (1) ◽  
pp. 014001 ◽  
Author(s):  
D A Cooke ◽  
G Barandun ◽  
S Vergani ◽  
B Brown ◽  
A Rubbia ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Free Region ◽  
Field Free Region
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