scholarly journals Externally Heated Hollow Cathode Arc Plasma Source for Experiments in Plasma Wakefield Acceleration

Instruments ◽  
2019 ◽  
Vol 3 (3) ◽  
pp. 48 ◽  
Author(s):  
Ryan Roussel ◽  
Gerard Andonian ◽  
Claire Hansel ◽  
Gerard Lawler ◽  
Walter Lynn ◽  
...  
Keyword(s):  
Hollow Cathode ◽  
Plasma Source ◽  
Plasma Current ◽  
Arc Plasma ◽  
Time Resolved ◽  
Wakefield Acceleration ◽  
Beam Parameters ◽  
Cathode Arc ◽  
Plasma Wakefield ◽  
Wakefield Accelerator

An externally heated, hollow cathode arc source was recommissioned at UCLA for use in experiments to drive plasma wakefields with shaped beams at the Argonne Wakefield Accelerator. The hollow cathode arc source provides a robust plasma column with a density in the 10 13 – 10 14 cm − 3 range while external heating of the cathode allows the plasma arc regime to be accessed with applied voltages down to 20 V. Overall source operating principals are described, along with time-resolved plasma current measurements and plasma density characterization with the use of a triple Langumir probe. The results show that relevant plasma densities that match facility beam parameters are readily achievable.

scholarly journals Hybrid LWFA–PWFA staging as a beam energy and brightness transformer: conceptual design and simulations

2019 ◽  
Vol 377 (2151) ◽  
pp. 20180175 ◽  
Author(s):  
A. Martinez de la Ossa ◽  
R. W. Assmann ◽  
M. Bussmann ◽  
S. Corde ◽  
J. P. Couperus Cabadağ ◽  
...  
Keyword(s):  
Conceptual Design ◽  
Particle Beam ◽  
Proof Of Concept ◽  
Particle In Cell ◽  
Wakefield Acceleration ◽  
Plasma Wakefield Accelerator ◽  
Simulation Results ◽  
Set Up ◽  
Plasma Wakefield ◽  
Wakefield Accelerator

We present a conceptual design for a hybrid laser-driven plasma wakefield accelerator (LWFA) to beam-driven plasma wakefield accelerator (PWFA). In this set-up, the output beams from an LWFA stage are used as input beams of a new PWFA stage. In the PWFA stage, a new witness beam of largely increased quality can be produced and accelerated to higher energies. The feasibility and the potential of this concept is shown through exemplary particle-in-cell simulations. In addition, preliminary simulation results for a proof-of-concept experiment in Helmholtz-Zentrum Dresden-Rossendorf (Germany) are shown. This article is part of the Theo Murphy meeting issue ‘Directions in particle beam-driven plasma wakefield acceleration’.

Diamond growth by hollow cathode arc plasma chemical vapor deposition

1998 ◽  
Vol 13 (11) ◽  
pp. 3114-3121 ◽  
Author(s):  
Gou-Tsau Liang ◽  
Franklin Chau-Nan Hong
Keyword(s):  
Chemical Vapor Deposition ◽  
Substrate Temperature ◽  
Hollow Cathode ◽  
Vapor Deposition ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Arc Plasma ◽  
Plasma Chemical ◽  
Plasma Chemical Vapor Deposition ◽  
Cathode Arc

Hollow cathode arc plasma chemical vapor deposition was employed to grow crystalline diamond films using 1.5% to 7% of methane in hydrogen. The growth rate was as high as 3.2 μ/h when using 5% CH4/H2 at a pressure of 15 Torr and a substrate temperature of 1083 K. However, an intermediate layer of several hundred nanometers was observed at the film-substrate interface by cross-section SEM. Raman and XPS characterizations showed that the interfacial layer consisted of sp2 carbon and TaC with Ta vaporized from the hot cathode tube. XRD and XPS results further showed that the deposited diamond films also contained TaC. Ta composition in the film increased with the increase of growth pressure, the reduction of substrate temperature, and the increase of H2 flow in the Ta tube. The diamond films deposited by using CHCl3 as carbon source had Ta concentrations one order of magnitude higher than those using CH4, as shown by XPS results, but the nucleation densities using CHCl3 were always higher than those using CH4.

scholarly journals A proposed demonstration of an experiment of proton-driven plasma wakefield acceleration based on CERN SPS

2012 ◽  
Vol 78 (4) ◽  
pp. 347-353 ◽  
Author(s):  
G. XIA ◽  
R. ASSMANN ◽  
R. A. FONSECA ◽  
C. HUANG ◽  
W. MORI ◽  
...  
Keyword(s):  
Nuclear Research ◽  
Experimental Program ◽  
Proton Synchrotron ◽  
Super Proton Synchrotron ◽  
European Organization ◽  
Particle In Cell ◽  
Wakefield Acceleration ◽  
Cell Simulation ◽  
Beam Parameters ◽  
Plasma Wakefield

AbstractThe proton bunch-driven plasma wakefield acceleration (PWFA) has been proposed as an approach to accelerate an electron beam to the TeV energy regime in a single plasma section. An experimental program has been recently proposed to demonstrate the capability of proton-driven PWFA by using existing proton beams from the European Organization for Nuclear Research (CERN) accelerator complex. At present, a spare Super Proton Synchrotron (SPS) tunnel, having a length of 600 m, could be used for this purpose. The layout of the experiment is introduced. Particle-in-cell simulation results based on realistic SPS beam parameters are presented. Simulations show that working in a self-modulation regime, the wakefield driven by an SPS beam can accelerate an externally injected ~10 MeV electrons to ~2 GeV in a 10-m plasma, with a plasma density of 7 × 1014 cm−3.

scholarly journals Investigation of the plasma composition of a discharge with a self-heating hollow cathode and an active anode in a gas mixture with titanium and hexamethyldisilazane vapors

2021 ◽  
Vol 2064 (1) ◽  
pp. 012046
Author(s):  
A I Menshakov ◽  
Yu A Bruhanova ◽  
Yu S Surkov ◽  
P A Skorynina
Keyword(s):  
Hollow Cathode ◽  
Optical Emission ◽  
Gas Mixture ◽  
High Deposition Rate ◽  
Arc Plasma ◽  
Plasma Composition ◽  
High Activation ◽  
Metal Vapors ◽  
Rate Test ◽  
Cathode Arc

Abstract The analysis of composition of low-pressure (~0.1-1 mTorr) hollow cathode arc plasma in Ar+N2 gas mixture with Ti+hexamethyldisilazane vapors was carried out by optical emission spectroscopy. The influence of HMDS flow rate (1-10 g/h), discharge current (10-50 A) and Ti-vapors flow on hexamethyldisilazane decomposition degree and plasma composition and was investigated. The proposed plasma activation method provides both an intense flow and a high activation degree of metal vapors, and a sufficient decomposition degree of precursor vapors for the formation of solid TiSiCN coatings at a high deposition rate. Test coatings with a thickness of 6 microns and a hardness of 31 GPa were obtained in 1 hour at 400ºC.

Hollow LaB6 cathode arc plasma source for material processing and testing

1995 ◽  
Vol 74-75 ◽  
pp. 188-194 ◽  
Author(s):  
H. Bolt ◽  
V. Hemel ◽  
H. Nickel ◽  
S. Tanaka
Keyword(s):  
Material Processing ◽  
Plasma Source ◽  
Arc Plasma ◽  
Cathode Arc

scholarly journals Producing multi-coloured bunches through beam-induced ionization injection in plasma wakefield accelerator

2019 ◽  
Vol 377 (2151) ◽  
pp. 20180184 ◽  
Author(s):  
N. Vafaei-Najafabadi ◽  
L. D. Amorim ◽  
E. Adli ◽  
W. An ◽  
C. I. Clarke ◽  
...  
Keyword(s):  
Experimental Evidence ◽  
Electron Beams ◽  
National Laboratory ◽  
Particle Beam ◽  
Wakefield Acceleration ◽  
Plasma Wakefield Accelerators ◽  
Plasma Wakefield Accelerator ◽  
Charge Field ◽  
Plasma Wakefield ◽  
Wakefield Accelerator

This paper discusses the properties of electron beams formed in plasma wakefield accelerators through ionization injection. In particular, the potential for generating a beam composed of co-located multi-colour beamlets is demonstrated in the case where the ionization is initiated by the evolving charge field of the drive beam itself. The physics of the processes of ionization and injection are explored through OSIRIS simulations. Experimental evidence showing similar features are presented from the data obtained in the E217 experiment at the FACET facility of the SLAC National Laboratory. This article is part of the Theo Murphy meeting issue ‘Directions in particle beam-driven plasma wakefield acceleration’.

scholarly journals Energy Enhancement and Energy Spread Compression of Electron Beams in a Hybrid Laser-Plasma Wakefield Accelerator

2019 ◽  
Vol 9 (12) ◽  
pp. 2561 ◽  
Author(s):  
Ying Wu ◽  
Changhai Yu ◽  
Zhiyong Qin ◽  
Wentao Wang ◽  
Zhijun Zhang ◽  
...  
Keyword(s):  
Laser Plasma ◽  
Electron Beams ◽  
Energy Levels ◽  
High Energy ◽  
Energy Spread ◽  
Particle In Cell ◽  
Wakefield Acceleration ◽  
Plasma Wakefield Accelerator ◽  
Plasma Wakefield ◽  
Wakefield Accelerator

We experimentally demonstrated the generation of narrow energy-spread electron beams with enhanced energy levels using a hybrid laser-plasma wakefield accelerator. An experiment featuring two-color electron beams showed that after the laser pump reached the depletion length, the laser-wakefield acceleration (LWFA) gradually evolved into the plasma-driven wakefield acceleration (PWFA), and thereafter, the PWFA dominated the electron acceleration. The energy spread of the electron beams was further improved by energy chirp compensation. Particle-in-cell simulations were performed to verify the experimental results. The generated monoenergetic high-energy electron beams are promising to upscale future accelerator systems and realize monoenergetic γ -ray sources.

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