Study on the change tendency of electro-magnetic signal under different vacuum degree for 10kV vacuum chamber

2015 ◽  
Author(s):  
Yuxin Mei ◽  
Huan Yuan ◽  
Xiaohua Wang ◽  
Ke Sha ◽  
Peijin Wang ◽  
...  
Keyword(s):  
Vacuum Chamber ◽  
Magnetic Signal ◽  
Vacuum Degree ◽  
Electro Magnetic ◽  
Change Tendency

Heat Transfer Effects on Dynamic Pressure Response of Pneumatic Vacuum Circuit

2011 ◽  
Author(s):  
Zhonghua Guo ◽  
Xiaoning Li ◽  
Toshiharu Kagawa
Keyword(s):  
Heat Transfer ◽  
Vacuum Chamber ◽  
Dynamic Pressure ◽  
Isothermal Condition ◽  
Pressure Response ◽  
Heat Transfer Area ◽  
Transfer Effects ◽  
Vacuum Degree ◽  
Long Time ◽  
Heat Transfer Effects

In the industrial conveying systems powered by pneumatic ejector, the dynamic pressure response of vacuum circuit is critical to systematic strategic planning. This paper analyzes heat transfer effects on dynamic pressure response. Experiments are carried out in temperature measurement with the stop method. The heat transfer ratio is obtained when the air is entrained from the acrylic chamber under the vacuum condition. The decreasing value of the air temperature inside the vacuum chamber is concerned with ejector flow rate characteristics, the material of the vacuum chamber and heat transfer area. The heat transfer area could be enlarged with copper wires stuffed in the chamber and the isothermal condition is realized. The suction process in such isothermal chamber is then compared with that in the acrylic chamber. The pressure response is faster in the acrylic chamber at the beginning of the suction process but a long time to reach final vacuum degree for temperature recovery.

Influence of vacuum degree on the effect of gas explosion suppression by vacuum chamber

2015 ◽  
Vol 38 ◽  
pp. 214-223 ◽  
Author(s):  
Hao Shao ◽  
Shuguang Jiang ◽  
Xin Zhang ◽  
Zhengyan Wu ◽  
Kai Wang ◽  
...  
Keyword(s):  
Vacuum Chamber ◽  
Gas Explosion ◽  
Explosion Suppression ◽  
Vacuum Degree

Heat and Mass Transfer of Cabbage in Vacuum Cooling and Experimental Research

2011 ◽  
Vol 467-469 ◽  
pp. 680-685
Author(s):  
An Kang Kan ◽  
Hou De Han ◽  
Quan Ping Duan
Keyword(s):  
Mass Transfer ◽  
Mathematical Models ◽  
Heat And Mass Transfer ◽  
Vacuum Chamber ◽  
Cylindrical Shape ◽  
Cooling Device ◽  
Vacuum Degree ◽  
Vacuum Cooling ◽  
Cooling Technology ◽  
Comparison And Analysis

The pre-cooling device was built and the columnar cabbage was taken as the study object in this paper. The heat and mass transfer mathematical models for the cylindrical shape vegetable were built and the experimental method was introduced to prove them. The comparison and analysis, under the certain vacuum degree of the vacuum chamber, was done between the simulation and the experiment. And the differences of the vacuum degree in the chamber, the temperature change of the cabbage, the relative humidity in the chamber and the cabbage mass loss, in the experiment and the simulation, were all recorded. The reason of the parameters variance and existent deference was also analyzed in this paper. The mathematical models and the result were useful for the study on the cylindrical vegetable vacuum pre-cooling technology.

scholarly journals Simulation of the dynamics of an intense proton beam in a collider NICA

2019 ◽  
Vol 201 ◽  
pp. 08003
Author(s):  
Margarita Korobitsina ◽  
Alexander Kovalenko ◽  
Andrey Kolomiets
Keyword(s):  
Proton Beam ◽  
Software Package ◽  
Vacuum Chamber ◽  
Quadrupole Magnet ◽  
Electro Magnetic ◽  
The Stability ◽  
The Moment ◽  
Beam Motion

In the physics of accelerators and colliders there is one important parameter as “impedance”. Impedance determines the level of the influence of the field induced by the beam in the longitudinal and transverse directions on the beam motion. Knowledge of the impedances is necessary for estimating the conditions for the stability of the beam motion in the designed accelerator. Thus, the main objective at the moment is the calculation of the impedance of each device in the collider for further calculation of their contribution to the general impedance. In the report the physics of the beam motion in an accelerator chamber is considered, the method of calculating the impedance - the method of electro-magnetic simulation through the CST Studio Suit software package is described, an example of the calculation of the impedance for the part of vacuum chamber of the quadrupole magnet, which is a part of the arch of the collider NICA is shown.

Analysis of Vacuum-Degree Limit of Plane Circular High-Vacuum Gas-Bearing

2011 ◽  
Vol 467-469 ◽  
pp. 940-949
Author(s):  
Lu Jun Li ◽  
Ming Zhang ◽  
Yu Zhu ◽  
Jin Chun Hu
Keyword(s):  
Flow Rate ◽  
Vacuum Chamber ◽  
Load Capacity ◽  
High Vacuum ◽  
The Finite Element Method ◽  
Vacuum Degree ◽  
Vacuum Technology ◽  
Multi Stage ◽  
The Relationship ◽  
Gas Bearing

This paper studied a one-dimensional model of high-vacuum plane circular gas-bearing with a three-stage sealing system, and analyzed the performances of the high-vacuum gas-bearing by combining the finite element method and the flow rate principle of the vacuum technology. For an expected pressure in the vacuum chamber, the zero load-capacity accident could take place. The reasons for the zero load-capacity accident were given through analyzing the flow rate of each sealing stage while the relationship between the pressure in the vacuum chamber and the inlet pressure was obtained. Besides, the influences of many parameters on the vacuum degree limit of the vacuum chamber were examined carefully. The analysis in this paper showed that for a given multi-stage seal system, the vacuum degree limit of the vacuum-chamber was inherent at the nonzero load-capacity condition.

Thin Pyrolytic Graphite Films for Electron Microscope Substrates

1971 ◽  
Vol 29 ◽  
pp. 226-227 ◽  
Author(s):  
George H. N. Riddle ◽  
Benjamin M. Siegel
Keyword(s):  
Vacuum Chamber ◽  
Pyrolytic Graphite ◽  
High Vacuum ◽  
Dark Field ◽  
Ultra High Vacuum ◽  
Graphite Substrate ◽  
Nickel Substrate ◽  
Routine Procedure ◽  
Field Electron Microscopy ◽  
Dark Field Electron

A routine procedure for growing very thin graphite substrate films has been developed. The films are grown pyrolytically in an ultra-high vacuum chamber by exposing (111) epitaxial nickel films to carbon monoxide gas. The nickel serves as a catalyst for the disproportionation of CO through the reaction 2C0 → C + CO2. The nickel catalyst is prepared by evaporation onto artificial mica at 400°C and annealing for 1/2 hour at 600°C in vacuum. Exposure of the annealed nickel to 1 torr CO for 3 hours at 500°C results in the growth of very thin continuous graphite films. The graphite is stripped from its nickel substrate in acid and mounted on holey formvar support films for use as specimen substrates.The graphite films, self-supporting over formvar holes up to five microns in diameter, have been studied by bright and dark field electron microscopy, by electron diffraction, and have been shadowed to reveal their topography and thickness. The films consist of individual crystallites typically a micron across with their basal planes parallel to the surface but oriented in different, apparently random directions about the normal to the basal plane.

New replica method with plasma polymerized film by glow discharge

1988 ◽  
Vol 46 ◽  
pp. 414-415
Author(s):  
A. Tanaka ◽  
M. Yamaguchi ◽  
T. Hirano
Keyword(s):  
Power Supply ◽  
Plasma Polymerization ◽  
Vacuum Chamber ◽  
Complex Surface ◽  
Replica Method ◽  
Metal Extraction ◽  
High Voltage Power Supply ◽  
Negative Glow ◽  
Hydrocarbon Gas ◽  
Hydrocarbon Molecules

The plasma polymerization replica method and its apparatus have been devised by Tanaka (1-3). We have published several reports on its application: surface replicas of biological and inorganic specimens, replicas of freeze-fractured tissues and metal-extraction replicas with immunocytochemical markers.The apparatus for plasma polymerization consists of a high voltage power supply, a vacuum chamber containing a hydrocarbon gas (naphthalene, methane, ethylene), and electrodes of an anode disk and a cathode of the specimen base. The surface replication by plasma polymerization in negative glow phase on the cathode was carried out by gassing at 0.05-0.1 Torr and glow discharging at 1.5-3 kV D.C. Ionized hydrocarbon molecules diffused into complex surface configurations and deposited as a three-dimensionally polymerized film of 1050 nm in thickness.The resulting film on the complex surface had uniform thickness and showed no granular texture. Since the film was chemically inert, resistant to heat and mecanically strong, it could be treated with almost any organic or inorganic solvents.

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