scholarly journals Control of amorphous solid water target morphology induced by deposition on a charged surface

2021 ◽  
Vol 9 ◽  
Author(s):  
Alexander Bespaly ◽  
Indranuj Dey ◽  
Jenya Papeer ◽  
Assaf Shaham ◽  
Pavel Komm ◽  
...  
Keyword(s):  
Water Vapor ◽  
Aspect Ratio ◽  
Laser Pulse ◽  
Amorphous Solid ◽  
Spot Size ◽  
Charged Surface ◽  
Amorphous Solid Water ◽  
High Intensity Laser ◽  
Solid Water ◽  
Intensity Laser

Abstract Microstructured targets demonstrate an enhanced coupling of high-intensity laser pulse to a target and play an important role in laser-induced ion acceleration. Here we demonstrate an approach that enables us to control the morphology of amorphous solid water (ASW) microstructured targets, by deposition of water vapor on a charged substrate, cooled down to 100 K. The morphology of the deposited ASW structures is controlled by varying the surface charge on the substrate and the pressure of water vapor. The obtained target is structured as multiple, dense spikes, confined by the charged area on the substrate, with increased aspect ratio of up to 5:1 and having a diameter comparable with the typical spot size of the laser focused onto the target.

Propagation of an ultrashort, high-intensity laser pulse in gas-target plasma

2012 ◽  
Vol 78 (4) ◽  
pp. 483-489 ◽  
Author(s):  
XIAOFANG WANG ◽  
GUANGHUI WANG ◽  
ZHANNAN MA ◽  
KEGONG DONG ◽  
BIN ZHU ◽  
...  
Keyword(s):  
Laser Pulse ◽  
High Intensity ◽  
Spot Size ◽  
High Energy ◽  
Beam Radius ◽  
Gas Target ◽  
Target Plasma ◽  
High Intensity Laser ◽  
Gas Targets ◽  
Intensity Laser

AbstractFor high-energy gain of electron acceleration by a laser wakefield, a stable or guiding propagation of an ultrashort, high-intensity laser pulse in a gas-target plasma is of fundamental importance. Preliminary experiments were carried out for the propagation of 30-fs, ~100-TW laser pulses of intensities ~1019W/cm2 in plasma of densities ~1019/cm3. Self-guiding length of nearly 1.4 mm was observed in a gas jet and 15 mm in a hydrogen-filled capillary. Fluid-dynamics simulations are used to characterize the two types of gas targets. Particle-in-cell simulations indicate that in the plasma, after the pulse's evolution of self-focusing and over-focusing, the high-intensity pulse could be stably guided with a beam radius close to the plasma wavelength. At lower plasma densities, a preformed plasma channel of a parabolic density profile matched to the laser spot size would be efficient for guiding the pulse.

scholarly journals Signatures of the Carrier Envelope Phase in Nonlinear Thomson Scattering

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 528
Author(s):  
Marcel Ruijter ◽  
Vittoria Petrillo ◽  
Thomas C. Teter ◽  
Maksim Valialshchikov ◽  
Sergey Rykovanov
Keyword(s):  
Laser Pulse ◽  
Radiation Spectrum ◽  
Thomson Scattering ◽  
High Energy ◽  
Phase Changes ◽  
High Energy Radiation ◽  
Carrier Envelope Phase ◽  
High Intensity Laser ◽  
Experimental Parameters ◽  
Intensity Laser

High-energy radiation can be generated by colliding a relativistic electron bunch with a high-intensity laser pulse—a process known as Thomson scattering. In the nonlinear regime the emitted radiation contains harmonics. For a laser pulse whose length is comparable to its wavelength, the carrier envelope phase changes the behavior of the motion of the electron and therefore the radiation spectrum. Here we show theoretically and numerically the dependency of the spectrum on the intensity of the laser and the carrier envelope phase. Additionally, we also discuss what experimental parameters are required to measure the effects for a beamed pulse.

scholarly journals Targets with cone-shaped microstructures from various materials for enhanced high-intensity laser–matter interaction

2021 ◽  
Vol 9 ◽  
Author(s):  
Tina Ebert ◽  
René Heber ◽  
Torsten Abel ◽  
Johannes Bieker ◽  
Gabriel Schaumann ◽  
...  
Keyword(s):  
Laser Pulse ◽  
High Intensity ◽  
Ultrashort Laser Pulse ◽  
Process Chain ◽  
Pulse Processing ◽  
High Intensity Laser ◽  
Matter Interaction ◽  
Different Characteristics ◽  
Ultrashort Laser ◽  
Intensity Laser

Abstract Targets with microstructured front surfaces have shown great potential in improving high-intensity laser–matter interaction. We present cone-shaped microstructures made out of silicon and titanium created by ultrashort laser pulse processing with different characteristics. In addition, we illustrate a process chain based on moulding to recreate the laser-processed samples out of polydimethylsiloxane, polystyrol and copper. With all described methods, samples of large sizes can be manufactured, therefore allowing time-efficient, cost-reduced and reliable ways to fabricate large quantities of identical targets.

The deposition angle-dependent density of amorphous solid water films

2003 ◽  
Vol 118 (1) ◽  
pp. 364-372 ◽  
Author(s):  
Z. Dohnálek ◽  
Greg A. Kimmel ◽  
Patrick Ayotte ◽  
R. Scott Smith ◽  
Bruce D. Kay
Keyword(s):  
Amorphous Solid ◽  
Amorphous Solid Water ◽  
Water Films ◽  
Solid Water ◽  
Deposition Angle ◽  
Dependent Density

Nuclear spin conversion of molecular hydrogen on amorphous solid water in the presence of O2traces

2011 ◽  
Vol 13 (6) ◽  
pp. 2172-2178 ◽  
Author(s):  
M. Chehrouri ◽  
J.-H. Fillion ◽  
H. Chaabouni ◽  
H. Mokrane ◽  
E. Congiu ◽  
...  
Keyword(s):  
Nuclear Spin ◽  
Molecular Hydrogen ◽  
Amorphous Solid ◽  
Spin Conversion ◽  
Amorphous Solid Water ◽  
Solid Water
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