| 1. |
- MacLellan, D. A., et al.
(författare)
-
Annular Fast Electron Transport in Silicon Arising from Low-Temperature Resistivity
- 2013
-
Ingår i: Physical Review Letters. - 1079-7114. ; 111:9
-
Tidskriftsartikel (refereegranskat)abstract
- Fast electron transport in Si, driven by ultraintense laser pulses, is investigated experimentally and via 3D hybrid particle-in-cell simulations. A transition from a Gaussian-like to an annular fast electron beam profile is demonstrated and explained by resistively generated magnetic fields. The results highlight the potential to completely transform the beam transport pattern by tailoring the resistivity-temperature profile at temperatures as low as a few eV.
|
|
| 2. |
- Coury, M., et al.
(författare)
-
Injection and transport properties of fast electrons in ultraintense laser-solid interactions
- 2013
-
Ingår i: Physics of Plasmas. - : AIP Publishing. - 1070-664X .- 1089-7674. ; 20:4
-
Tidskriftsartikel (refereegranskat)abstract
- Fast electron injection and transport in solid foils irradiated by sub-picosecond-duration laser pulses with peak intensity equal to 4 x 10(20)W/cm(2) is investigated experimentally and via 3D simulations. The simulations are performed using a hybrid-particle-in-cell (PIC) code for a range of fast electron beam injection conditions, with and without inclusion of self-generated resistive magnetic fields. The resulting fast electron beam transport properties are used in rear-surface plasma expansion calculations to compare with measurements of proton acceleration, as a function of target thickness. An injection half-angle of similar to 50 degrees - 70 degrees is inferred, which is significantly larger than that derived from previous experiments under similar conditions. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4799726]
|
|
| 3. |
- MacLellan, D A, et al.
(författare)
-
Tunable mega-ampere electron current propagation in solids by dynamic control of lattice melt.
- 2014
-
Ingår i: Physical Review Letters. - 1079-7114. ; 113:18
-
Tidskriftsartikel (refereegranskat)abstract
- The influence of lattice-melt-induced resistivity gradients on the transport of mega-ampere currents of fast electrons in solids is investigated numerically and experimentally using laser-accelerated protons to induce isochoric heating. Tailoring the heating profile enables the resistive magnetic fields which strongly influence the current propagation to be manipulated. This tunable laser-driven process enables important fast electron beam properties, including the beam divergence, profile, and symmetry to be actively tailored, and without recourse to complex target manufacture.
|
|
| 4. |
- Yuan, X. H., et al.
(författare)
-
Effects of target pre-heating and expansion on terahertz radiation production from intense laser-solid interactions
- 2014
-
Ingår i: High Power Laser Science and Engineering. - : Cambridge University Press (CUP). - 2095-4719 .- 2052-3289. ; 2
-
Tidskriftsartikel (refereegranskat)abstract
- The first experimental measurements of intense laser-driven terahertz (THz) radiation from a solid target which is preheated by an intense pulse of laser-accelerated protons is reported. The total energy of the THz radiation is found to decrease by approximately a factor of 2 compared to a cold target reference. This is attributed to an increase in the scale length of the preformed plasma, driven by proton heating, at the front surface of the target, where the THz radiation is generated. The results show the importance of controlling the preplasma scale length for THz production.
|
|
