The Spatial Distribution of the Time-resolved Optical Radiation Intensity Spectrum from a Neon-filled Cold-Cathode Arc Conduction Valve in Pulse Operation†

1961 ◽  
Vol 11 (4) ◽  
pp. 297-302
Author(s):  
R. FEINBEEG ◽  
M. E. ROBERTS
Keyword(s):  
Spatial Distribution ◽  
Radiation Intensity ◽  
Optical Radiation ◽  
Cold Cathode ◽  
Pulse Operation ◽  
Time Resolved ◽  
Cathode Arc

scholarly journals Tracking ground state Ba+ions in an expanding laser–plasma plume using time-resolved vacuum ultraviolet photoionization imaging

2004 ◽  
Vol 22 (3) ◽  
pp. 207-213 ◽  
Author(s):  
J.S. HIRSCH ◽  
K.D. KAVANAGH ◽  
E.T. KENNEDY ◽  
J.T. COSTELLO ◽  
P. NICOLOSI ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Laser Plasma ◽  
Ground State ◽  
Column Density ◽  
Vacuum Ultraviolet ◽  
Plasma Plume ◽  
Experimental System ◽  
Time Resolved ◽  
Density Maps ◽  
Ccd Array

We report results from a study of the integrated column density and expansion dynamics of ground-state-selected Ba+ions in a laser–plasma plume using a new experimental system—VPIF (vacuum-ultraviolet photoabsorption imaging facility). The ions are tracked by recording the attenuation of a pulsed and collimated vacuum ultraviolet beam, tuned to the 5p–6dinner-shell resonance of singly ionized barium, as the expanding plasma plume moves across it. The attenuated beam is allowed to fall on a CCD array where the spatial distribution of the absorption is recorded. Time-resolved ion velocity and integrated column density maps are readily extracted from the photoionization images.

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.

Spatial distribution of radiation intensity in high-frequency electrodeless discharge lamps

2000 ◽  
Vol 67 (1) ◽  
pp. 14-21 ◽  
Author(s):  
K. Yu. Nagulin ◽  
A. Kh. Gil’mutdinov ◽  
O. R. Badrutdinov
Keyword(s):  
Spatial Distribution ◽  
Radiation Intensity ◽  
High Frequency ◽  
Electrodeless Discharge

A Theory of Cold-Cathode Arc Movement in a Magnetic Field

Nature ◽  
1961 ◽  
Vol 190 (4774) ◽  
pp. 428-429 ◽  
Author(s):  
P. E. SECKER ◽  
A. E. GUILE
Keyword(s):  
Magnetic Field ◽  
Cold Cathode ◽  
Cathode Arc

Software tools for optical radiation intensity analysis

1994 ◽  
Author(s):  
Vladimir V. Apanasovich ◽  
Eugene G. Novikov ◽  
Eugene V. Zelenko
Keyword(s):  
Radiation Intensity ◽  
Optical Radiation ◽  
Software Tools ◽  
Intensity Analysis

scholarly journals Cold cathode arc attachment: The importance of the high local pressure

1998 ◽  
Vol 70 (6) ◽  
pp. 1175-1180 ◽  
Author(s):  
J.-L. Meunier ◽  
S. Coulombe
Keyword(s):  
Cold Cathode ◽  
Local Pressure ◽  
Cathode Arc

Time-resolved spatial distribution of an ablative capillary discharge obtained with a pinhole camera

2000 ◽  
Vol 33 (15) ◽  
pp. 1837-1842 ◽  
Author(s):  
R Dussart ◽  
D Hong ◽  
S Götze ◽  
W E S Rosenfeld ◽  
J Pons ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Capillary Discharge ◽  
Pinhole Camera ◽  
Time Resolved

scholarly journals Unveiling the spatial distribution of molecular coherences at conical intersections by covariance X-ray diffraction signals

2021 ◽  
Vol 118 (22) ◽  
pp. e2105046118
Author(s):  
Stefano M. Cavaletto ◽  
Daniel Keefer ◽  
Jérémy R. Rouxel ◽  
Flavia Aleotti ◽  
Francesco Segatta ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Three Dimensional ◽  
Laser Pulses ◽  
Conical Intersection ◽  
Conical Intersections ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Diffraction Imaging ◽  
The Rich

The outcomes and timescales of molecular nonadiabatic dynamics are decisively impacted by the quantum coherences generated at localized molecular regions. In time-resolved X-ray diffraction imaging, these coherences create distinct signatures via inelastic photon scattering, but they are buried under much stronger background elastic features. Here, we exploit the rich dynamical information encoded in the inelastic patterns, which we reveal by frequency-dispersed covariance ultrafast powder X-ray diffraction of stochastic X-ray free-electron laser pulses. This is demonstrated for the photoisomerization of azobenzene involving the passage through a conical intersection, where the nuclear wave packet branches and explores different quantum pathways. Snapshots of the coherence dynamics are obtained at high frequency shifts, not accessible with conventional diffraction measurements. These provide access to the timing and to the confined spatial distribution of the valence electrons directly involved in the conical intersection passage. This study can be extended to full three-dimensional imaging of conical intersections with ultrafast X-ray and electron diffraction.

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