scholarly journals Radiation Reaction and Ultra-high Intensity Lasers

2014 ◽  
Author(s):  
F. V. Hartemann
Keyword(s):  
High Intensity ◽  
Radiation Reaction

scholarly journals Realising single-shot measurements of quantum radiation reaction in high-intensity lasers

2019 ◽  
Vol 21 (5) ◽  
pp. 053030 ◽  
Author(s):  
C D Baird ◽  
C D Murphy ◽  
T G Blackburn ◽  
A Ilderton ◽  
S P D Mangles ◽  
...  
Keyword(s):  
High Intensity ◽  
Radiation Reaction ◽  
Single Shot ◽  
Quantum Radiation

scholarly journals Radiation reaction in electron–beam interactions with high-intensity lasers

2020 ◽  
Vol 4 (1) ◽  
Author(s):  
T. G. Blackburn
Keyword(s):  
Electromagnetic Fields ◽  
High Intensity ◽  
Large Scale ◽  
Radiation Reaction ◽  
Emit Radiation ◽  
High Intensity Laser ◽  
Laser Systems ◽  
Conservation Of Momentum ◽  
Individual Photon ◽  
Intensity Laser

AbstractCharged particles accelerated by electromagnetic fields emit radiation, which must, by the conservation of momentum, exert a recoil on the emitting particle. The force of this recoil, known as radiation reaction, strongly affects the dynamics of ultrarelativistic electrons in intense electromagnetic fields. Such environments are found astrophysically, e.g. in neutron star magnetospheres, and will be created in laser–matter experiments in the next generation of high-intensity laser facilities. In many of these scenarios, the energy of an individual photon of the radiation can be comparable to the energy of the emitting particle, which necessitates modelling not only of radiation reaction, but quantum radiation reaction. The worldwide development of multi-petawatt laser systems in large-scale facilities, and the expectation that they will create focussed electromagnetic fields with unprecedented intensities $$> 10^{23}\,\mathrm {W}\text {cm}^{-2}$$ > 10 23 W cm - 2 , has motivated renewed interest in these effects. In this paper I review theoretical and experimental progress towards understanding radiation reaction, and quantum effects on the same, in high-intensity laser fields that are probed with ultrarelativistic electron beams. In particular, we will discuss how analytical and numerical methods give insight into new kinds of radiation–reaction-induced dynamics, as well as how the same physics can be explored in experiments at currently existing laser facilities.

Effects of radiation reaction in the interaction between cluster media and high intensity lasers in the radiation dominant regime

2016 ◽  
Vol 23 (6) ◽  
pp. 063115 ◽  
Author(s):  
Natsumi Iwata ◽  
Hideo Nagatomo ◽  
Yuji Fukuda ◽  
Ryutaro Matsui ◽  
Yasuaki Kishimoto
Keyword(s):  
High Intensity ◽  
Radiation Reaction ◽  
Effects Of Radiation

scholarly journals Signatures of quantum effects on radiation reaction in laser–electron-beam collisions

2017 ◽  
Vol 83 (5) ◽  
Author(s):  
C. P. Ridgers ◽  
T. G. Blackburn ◽  
D. Del Sorbo ◽  
L. E. Bradley ◽  
C. Slade-Lowther ◽  
...  
Keyword(s):  
Electron Beam ◽  
Laser Pulse ◽  
High Intensity ◽  
Average Energy ◽  
Quantum Effects ◽  
Radiation Reaction ◽  
High Intensity Laser ◽  
Efficiency Parameter ◽  
Laser Systems ◽  
Intensity Laser

Two signatures of quantum effects on radiation reaction in the collision of a ${\sim}$GeV electron beam with a high intensity (${>}3\times 10^{20}~\text{W}~\text{cm}^{-2}$) laser pulse have been considered. We show that the decrease in the average energy of the electron beam may be used to measure the Gaunt factor $g$ for synchrotron emission. We derive an equation for the evolution of the variance in the energy of the electron beam in the quantum regime, i.e. quantum efficiency parameter $\unicode[STIX]{x1D702}\not \ll 1$. We show that the evolution of the variance may be used as a direct measure of the quantum stochasticity of the radiation reaction and determine the parameter regime where this is observable. For example, stochastic emission results in a 25 % increase in the standard deviation of the energy spectrum of a GeV electron beam, 1 fs after it collides with a laser pulse of intensity $10^{21}~\text{W}~\text{cm}^{-2}$. This effect should therefore be measurable using current high-intensity laser systems.

A New High Intensity Grid Cap for RCA-EMU-3 Electron Microscopes

1968 ◽  
Vol 26 ◽  
pp. 316-317
Author(s):  
George Christov ◽  
Bolivar J. Lloyd
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
High Voltage ◽  
High Intensity ◽  
Electron Gun ◽  
Tungsten Filament ◽  
Fluorescent Screen ◽  
Electron Microscopes ◽  
Pass Through ◽  
Ground Potential

A new high intensity grid cap has been designed for the RCA-EMU-3 electron microscope. Various parameters of the new grid cap were investigated to determine its characteristics. The increase in illumination produced provides ease of focusing on the fluorescent screen at magnifications from 1500 to 50,000 times using an accelerating voltage of 50 KV.The EMU-3 type electron gun assembly consists of a V-shaped tungsten filament for a cathode with a thin metal threaded cathode shield and an anode with a central aperture to permit the beam to course the length of the column. The cathode shield is negatively biased at a potential of several hundred volts with respect to the filament. The electron beam is formed by electrons emitted from the tip of the filament which pass through an aperture of 0.1 inch diameter in the cap and then it is accelerated by the negative high voltage through a 0.625 inch diameter aperture in the anode which is at ground potential.

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