scholarly journals Experimental installation for studying cathode plasma processes in vacuum gap of pulsed electron accelerator with gas or liquid injection

2021 ◽  
Vol 2064 (1) ◽  
pp. 012036
Author(s):  
I S Egorov ◽  
A V Klimkin ◽  
A V Poloskov ◽  
M A Serebrennikov ◽  
M V Trigub
Keyword(s):  
Electron Accelerator ◽  
Electron Beams ◽  
Direct Action ◽  
Optical Observations ◽  
Particle Accelerators ◽  
Cathode Plasma ◽  
Plasma Emitter ◽  
Formation Region ◽  
Plasma Sources ◽  
Experimental Stand

Abstract One of the directions of using plasma sources is the formation of plasma emitters for electron beams as part of direct-action charged particle accelerators. The parameters of the accelerator generators require mutual matching with the characteristics of the plasma emitters. The paper describes the design, composition and diagnostic equipment of an experimental stand based on a vacuum chamber of a pulsed electron accelerator for testing plasma sources of pulsed electron beams. The stand includes a vacuum volume with a high-voltage bushing, pumping out pipes, diagnostic windows along the perimeter and a mounting flange of a complex device for diagnosing the characteristics of pulsed electron beams. The stand provides the possibility of controlled supply of gas and liquid to the formation region of the plasma emitter of electrons under the influence of an accelerating voltage pulse. The location of the diagnostic windows and flanges of the stand allows direct optical observations of the plasma formation region in the frontal and profile directions. The use of the stand will make it possible to determine the characteristics of the tested plasma emitters for their operation as part of a vacuum diode of pulsed electron accelerator.

scholarly journals Generation of Pulsed Electron Beams by Simple Cold Cathode Plasma Guns

1986 ◽  
Vol 14 (4) ◽  
pp. 518-522 ◽  
Author(s):  
B. Wernsman ◽  
H. F. Ranea-Sandoval ◽  
J. J. Rocca ◽  
H. Mancini
Keyword(s):  
Electron Beams ◽  
Cold Cathode ◽  
Cathode Plasma ◽  
Plasma Guns

scholarly journals Electron beam control using experimentally measured transport matrices

1994 ◽  
Vol 12 (1) ◽  
pp. 17-21 ◽  
Author(s):  
C.B. McKee ◽  
John M.J. Madey
Keyword(s):  
Spatial Distribution ◽  
Electron Beam ◽  
Electron Accelerator ◽  
Electron Beams ◽  
Transport Systems ◽  
Evoked Responses ◽  
Free Electron Lasers ◽  
High Brightness ◽  
Electron Accelerators

Free electron lasers (FELs) place very stringent requirements on the quality of electron beams. Present techniques for commissioning and operating electron accelerators may not be optimized to produce the high brightness beams needed. Therefore, it is proposed to minimize the beamline errors in electron accelerator transport systems by minimizing the deviations between the experimentally measured and design transport matrices of each beamline section. The transport matrix for each section is measured using evoked responses. In addition, the transverse phase space of the beam is reconstructed by measuring the spatial distribution of the electrons at a number of different betatron phases and applying tomographic techniques developed for medical imaging.

Radiation processing of natural latex using a wide-aperture electron accelerator with a plasma emitter

2015 ◽  
Vol 49 (3) ◽  
pp. 143-145 ◽  
Author(s):  
M. S. Vorob’ev ◽  
V. V. Denisov ◽  
N. N. Koval’ ◽  
V. V. Shugurov ◽  
V. V. Yakovlev ◽  
...  
Keyword(s):  
Electron Accelerator ◽  
Radiation Processing ◽  
Plasma Emitter ◽  
Wide Aperture

Characterisation of electron beams from laser-driven particle accelerators

2013 ◽  
Author(s):  
E. Brunetti ◽  
G. G. Manahan ◽  
R. P. Shanks ◽  
M. R. Islam ◽  
B. Ersfeld ◽  
...  
Keyword(s):  
Electron Beams ◽  
Particle Accelerators

scholarly journals Plasma sources based on a low-pressure arc discharge

2003 ◽  
Vol 21 (2) ◽  
pp. 249-254 ◽  
Author(s):  
YU.H. AKHMADEEV ◽  
S.V. GRIGORIEV ◽  
N.N. KOVAL ◽  
P.M. SCHANIN
Keyword(s):  
Surface Modification ◽  
Hollow Cathode ◽  
Erosion Rate ◽  
Arc Discharge ◽  
Plasma Source ◽  
Surface Discharge ◽  
Trigger System ◽  
Cathode Plasma ◽  
Plasma Sources ◽  
Hot Filament

This article presents two types of a hollow-cathode plasma source based on an arc discharge where the electrons emitted either by a hot filament or by a surface-discharge-based trigger system initiate a gas arc discharge. The sources produce gas plasmas of densities 1010–1012 cm−3 in large volumes of up to 0.5 m3 at a discharge current of 100–200 A and at a pressure of 10−1–10−2 Pa. Consideration is given to some peculiarities of the operation of the plasma sources with various working gases (Ar, N2, O2). The erosion rate of the cold hollow cathode in the designed plasma sources is shown to be 10 times lower than that found in an ordinary one. The sources are employed for plasma-assisted surface modification of solids.

scholarly journals Revived fossil plasma sources in galaxy clusters

2020 ◽  
Vol 634 ◽  
pp. A4 ◽  
Author(s):  
S. Mandal ◽  
H. T. Intema ◽  
R. J. van Weeren ◽  
T. W. Shimwell ◽  
A. Botteon ◽  
...  
Keyword(s):  
Particle Acceleration ◽  
Galaxy Clusters ◽  
Radiative Lifetime ◽  
Low Frequency ◽  
Radio Spectrum ◽  
Optical Observations ◽  
Relativistic Electrons ◽  
Plasma Sources ◽  
X Ray ◽  
Sky Survey

It is well established that particle acceleration by shocks and turbulence in the intra-cluster medium can produce cluster-scale synchrotron emitting sources. However, the detailed physics of these particle acceleration processes is still not well understood. One of the main open questions is the role of fossil relativistic electrons that have been deposited in the intracluster medium (ICM) by radio galaxies. These synchrotron-emitting electrons are very difficult to study as their radiative lifetime is only tens of Myr at gigahertz frequencies, and they are therefore a relatively unexplored population. Despite the typical steep radio spectrum due to synchrotron losses, these fossil electrons are barely visible even at radio frequencies well below the gigahertz level. However, when a pocket of fossil radio plasma is compressed, it boosts the visibility at sub-gigahertz frequencies, creating what are known as radio phoenices. This compression can be the result of bulk motion and shocks in the ICM due to merger activity. In this paper we demonstrate the discovery potential of low-frequency radio sky surveys to find and study revived fossil plasma sources in galaxy clusters. We used the 150 MHz TIFR GMRT Sky Survey and the 1.4 GHz NVSS sky survey to identify candidate radio phoenices. A subset of three candidates was studied in detail using deep multi-band radio observations (LOFAR and GMRT), X-ray obserations (Chandra or XMM-Newton), and archival optical observations. Two of the three sources are new discoveries. Using these observations, we identified common observational properties (radio morphology, ultra-steep spectrum, X-ray luminosity, dynamical state) that will enable us to identify this class of sources more easily, and will help us to understand the physical origin of these sources.

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