scholarly journals NONINVASIVE LASER PROBING OF ULTRASHORT SINGLE ELECTRON BUNCHES FOR ACCELERATOR AND LIGHT SOURCE DEVELOPMENT

2007 ◽  
Vol 21 (03n04) ◽  
pp. 527-539 ◽  
Author(s):  
PAUL R. BOLTON
Keyword(s):  
Light Source ◽  
High Energy ◽  
Single Electron ◽  
Beam Diagnostics ◽  
High Brightness ◽  
Electron Bunches ◽  
Laser Probing ◽  
Electro Optic ◽  
Plasma Wakefield Accelerators ◽  
Plasma Wakefield

Companion development of ultrafast electron beam diagnostics capable of noninvasively resolving single bunch detail is essential for the development of high energy, high brightness accelerator facilities and associated beam-based light source applications. Existing conventional accelerators can exhibit timing-jitter down to the 100 femtosecond level which exceeds their single bunch duration capability. At the other extreme, in relatively jitterless environments, laser-plasma wakefield accelerators (LWFA) can generate single electron bunches of duration estimated to be of order 10 femtoseconds making this setting a valuable testbed for development of broadband electron bunch diagnostics. Characteristics of electro-optic schemes and laser-induced reflectance are discussed with emphasis on temporal resolution.

scholarly journals Demonstration of a compact plasma accelerator powered by laser-accelerated electron beams

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
T. Kurz ◽  
T. Heinemann ◽  
M. F. Gilljohann ◽  
Y. Y. Chang ◽  
J. P. Couperus Cabadağ ◽  
...  
Keyword(s):  
Electron Beams ◽  
Hybrid Approach ◽  
Plasma Accelerator ◽  
Power Laser ◽  
Breakdown Threshold ◽  
High Brightness ◽  
Electron Bunches ◽  
Plasma Wakefield Accelerators ◽  
Plasma Wakefield ◽  
Compact Sources

AbstractPlasma wakefield accelerators are capable of sustaining gigavolt-per-centimeter accelerating fields, surpassing the electric breakdown threshold in state-of-the-art accelerator modules by 3-4 orders of magnitude. Beam-driven wakefields offer particularly attractive conditions for the generation and acceleration of high-quality beams. However, this scheme relies on kilometer-scale accelerators. Here, we report on the demonstration of a millimeter-scale plasma accelerator powered by laser-accelerated electron beams. We showcase the acceleration of electron beams to 128 MeV, consistent with simulations exhibiting accelerating gradients exceeding 100 GV m−1. This miniaturized accelerator is further explored by employing a controlled pair of drive and witness electron bunches, where a fraction of the driver energy is transferred to the accelerated witness through the plasma. Such a hybrid approach allows fundamental studies of beam-driven plasma accelerator concepts at widely accessible high-power laser facilities. It is anticipated to provide compact sources of energetic high-brightness electron beams for quality-demanding applications such as free-electron lasers.

scholarly journals High-resolution sampling of beam-driven plasma wakefields

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
S. Schröder ◽  
C. A. Lindstrøm ◽  
S. Bohlen ◽  
G. Boyle ◽  
R. D’Arcy ◽  
...  
Keyword(s):  
Electric Fields ◽  
High Energy ◽  
Acceleration Process ◽  
Plasma Parameters ◽  
Particle Beams ◽  
Particle In Cell ◽  
Precise Control ◽  
Plasma Wakefield Accelerators ◽  
Plasma Wakefield ◽  
Good Agreement

AbstractPlasma-wakefield accelerators driven by intense particle beams promise to significantly reduce the size of future high-energy facilities. Such applications require particle beams with a well-controlled energy spectrum, which necessitates detailed tailoring of the plasma wakefield. Precise measurements of the effective wakefield structure are therefore essential for optimising the acceleration process. Here we propose and demonstrate such a measurement technique that enables femtosecond-level (15 fs) sampling of longitudinal electric fields of order gigavolts-per-meter (0.8 GV m−1). This method—based on energy collimation of the incoming bunch—made it possible to investigate the effect of beam and plasma parameters on the beam-loaded longitudinally integrated plasma wakefield, showing good agreement with particle-in-cell simulations. These results open the door to high-quality operation of future plasma accelerators through precise control of the acceleration process.

Design of Projection Light Source for Solid Volumetric True-3D Display

2013 ◽  
Vol 321-324 ◽  
pp. 466-469
Author(s):  
Guang Lei Yang ◽  
Chang Long Jing ◽  
Hui Hui Yao ◽  
Qi Bin Feng
Keyword(s):  
Light Source ◽  
High Power ◽  
High Energy ◽  
Luminous Flux ◽  
Energy Utilization ◽  
Utilization Rate ◽  
3D Display ◽  
High Brightness ◽  
Light Emitting ◽  
Measurement Results

The solid volumetric true−3D display requires light source with high brightness, high energy utilization rate and high frequency color field. So high−power red, green and blue LEDs with collimators were used as the projection light source. Firstly, the required quantity of LEDs was determined according to the required output luminance, the efficiency of the projector and the red, green and blue LEDs' parameters. Secondly, with the consideration of the LEDs' dimensions, light−emitting mode and output luminous flux, collimator was designed and simulation model was established. Simulation and practical measurement results both show that light source based on high−power LED meet the requirements of the solid volumetric true−3D display.

Second-generation scanning photoemission microscope at the National Synchrotron Light Source

1993 ◽  
Vol 51 ◽  
pp. 650-651
Author(s):  
Cheng-Hao Ko ◽  
Janos Kirz ◽  
Harald Ade ◽  
Erik Johnson ◽  
Steven Hulbert ◽  
...  
Keyword(s):  
Light Source ◽  
First Generation ◽  
Fresnel Zone ◽  
High Energy ◽  
High Energy Resolution ◽  
National Synchrotron Light Source ◽  
Optical Elements ◽  
High Brightness ◽  
Synchrotron Light ◽  
New Generation

We are commissioning a new generation scanning photoemission microscope (X1-SPEM II) at beamline X1A of the National Synchrotron Light Source (NSLS). Our first generation scanning photoemission microscope (X1-SPEM I) was the first to achieve submicron resolution. One of the major improvements is the replacement of the home-made single pass cylindrical mirror analyzer with a high energy resolution, multi-channel Hemispherical Sector Analyzer (HSA). The alignment scheme for the optical elements has also been redesigned. The advantages of these two major improvements will be discussed.A photoemission microscope requires a high brightness source and a good focusing scheme. In most cases, a monochromator is placed between the photon source and the focusing optical elements. Our X1-SPEM uses the soft x-ray undulator at the NSLS as a high brightness source. A Fresnel zone plate is coherently illuminated by the monochromatic beam selected by the spherical grating monochromator (250-800 eV range) to form a microprobe, less then 0.2 μm in size.

Basic concepts in plasma accelerators

2006 ◽  
Vol 364 (1840) ◽  
pp. 559-575 ◽  
Author(s):  
Robert Bingham
Keyword(s):  
Particle Beam ◽  
High Energy ◽  
High Brightness ◽  
Highly Nonlinear ◽  
Laser Wakefield ◽  
Plasma Accelerators ◽  
Positron Beams ◽  
Plasma Wakefield ◽  
Wakefield Accelerator ◽  
Laser Wakefield Accelerator

In this article, we present the underlying physics and the present status of high gradient and high-energy plasma accelerators. With the development of compact short pulse high-brightness lasers and electron and positron beams, new areas of studies for laser/particle beam–matter interactions is opening up. A number of methods are being pursued vigorously to achieve ultra-high-acceleration gradients. These include the plasma beat wave accelerator (PBWA) mechanism which uses conventional long pulse (∼100 ps) modest intensity lasers ( I ∼10 14 –10 16  W cm −2 ), the laser wakefield accelerator (LWFA) which uses the new breed of compact high-brightness lasers (<1 ps) and intensities >10 18  W cm −2 , self-modulated laser wakefield accelerator (SMLWFA) concept which combines elements of stimulated Raman forward scattering (SRFS) and electron acceleration by nonlinear plasma waves excited by relativistic electron and positron bunches the plasma wakefield accelerator. In the ultra-high intensity regime, laser/particle beam–plasma interactions are highly nonlinear and relativistic, leading to new phenomenon such as the plasma wakefield excitation for particle acceleration, relativistic self-focusing and guiding of laser beams, high-harmonic generation, acceleration of electrons, positrons, protons and photons. Fields greater than 1 GV cm −1 have been generated with monoenergetic particle beams accelerated to about 100 MeV in millimetre distances recorded. Plasma wakefields driven by both electron and positron beams at the Stanford linear accelerator centre (SLAC) facility have accelerated the tail of the beams.

scholarly journals Hot spots and dark current in advanced plasma wakefield accelerators

2016 ◽  
Vol 19 (1) ◽  
Author(s):  
G. G. Manahan ◽  
A. Deng ◽  
O. Karger ◽  
Y. Xi ◽  
A. Knetsch ◽  
...  
Keyword(s):  
Hot Spots ◽  
Dark Current ◽  
Plasma Wakefield Accelerators ◽  
Plasma Wakefield ◽  
Wakefield Accelerators

scholarly journals Concept of generation of extremely compressed high-energy electron bunches in several interfering intense laser pulses with tilted amplitude fronts

2012 ◽  
Vol 31 (1) ◽  
pp. 23-28 ◽  
Author(s):  
V.V. Korobkin ◽  
M.Yu. Romanovskiy ◽  
V.A. Trofimov ◽  
O.B. Shiryaev
Keyword(s):  
Laser Pulses ◽  
High Energy ◽  
Intense Laser ◽  
High Energy Electron ◽  
Speed Of Light ◽  
Electron Bunches ◽  
Newton Equation ◽  
High Energies ◽  
Neutral Gas ◽  
Intense Laser Pulses

AbstractA new concept of generating tight bunches of electrons accelerated to high energies is proposed. The electrons are born via ionization of a low-density neutral gas by laser radiation, and the concept is based on the electrons acceleration in traps arising within the pattern of interference of several relativistically intense laser pulses with amplitude fronts tilted relative to their phase fronts. The traps move with the speed of light and (1) collect electrons; (2) compress them to extremely high density in all dimensions, forming electron bunches; and (3) accelerate the resulting bunches to energies of at least several GeV per electron. The simulations of bunch formation employ the Newton equation with the corresponding Lorentz force.

SUMMARY OF WORKING GROUP 4: APPLICATIONS OF HIGH BRIGHTNESS BEAMS TO ADVANCED ACCELERATORS AND LIGHTS SOURCES

2007 ◽  
Vol 22 (23) ◽  
pp. 4265-4269
Author(s):  
MITSURU UESAKA ◽  
ANDREA ROSSI
Keyword(s):  
Compton Scattering ◽  
Working Group ◽  
High Brightness ◽  
X Ray ◽  
Group 4 ◽  
Wakefield Acceleration ◽  
Plasma Wakefield

We categorized 16 contributions into the three sub-fields. Those are 1. Compton scattering X-ray sources, 2. FEL and RF photoinjectors and 3. Plasma wakefield acceleration/innovative acceleration schemes. We performed a half day working group for each sub-field. The titles and summaries of the contributions appear in the article.

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