Conveners
WG4
- Eugene Tan ()
WG4
- Anand Moorti ()
WG4
- Dazhang Li (IHEP, CAS)
Recent progresses on the development of particle and photon sources from laser-wakefield accelerators at National Central University (NCU) will be presented in this talk. At NCU, a 100-TW multi-beam laser system and a joint experimental platform have been optimized for laser plasma acceleration. The current research focuses are compact high-quality laser wakefield accelerator (LWFA) and its...
Hard x-ray/gamma-ray emission from laser wakefield accelerator have a number of interesting applications, e.g. ultrafast dynamic probing of matter. Betatron radiation and Thomson scattering are highly collimated laser-driven hard x-ray/gamma-ray sources with fs duration which generated by electron transversely oscillation in wakefield or laser field. However, photon yield is always limited by...
There are far fewer beam-driven wakefield accelerator experiments than laser-driven ones worldwide. This is mainly because there are far fewer facilities that can provide the high-current, high-quality electron beams that are required for such experiments. This is the same situation in Korea. Only recently, a full-scale research program on beam-driven wakefield took off. In this talk, we will...
Laser-plasma accelerators have been the most promising candidates for future compact accelerators which can be used for next-generation free-electron lasers (FELs). However, their poor stability and reproducibility limit the applications of the laser-plasma accelerator. PAL-ITF (injector test facility) has an S-band RF photocathode gun and final energy of 70 MeV, with a lower emittance, which...
The acceleration gradient of a solid-state accelerator is limited by the damage field to the structure material. A dielectric is therefore the choice of material for an accelerator operating at the optical frequencies. A dielectric laser accelerator has the potential of stable high-gradient electron acceleration over a long distance. Owing to the much shorter drive wavelength, a dielectric...
Microbeams of the ionization radiation are widely used in the scientific and industrial fields. If the size of the microbeam system is as small as the several-tens keV class electron microscope, it will be possible to perform the radiobiology experiments in university-class laboratories. Since a laser dielectric acceleration system (DLA) has the potential to realize an on-chip accelerator, the...
Plasma wakefield accelerators, driven by either short laser pulses or charged particle beams, have the acceleration gradient of the order of 1 to 100 GeV and are regarded as the accelerators of the next generation. In this talk, I will introduce the plasma wakefield accelerator studies at Institute of High Energy Physics, Chinese Academy of Sciences, including the CEPC plasma injector studies,...
The concept of Circular Electron Positron Collider (CEPC) was presented in 2012
aiming to further study the Higgs bosons. It mainly consists of three parts including a linac, a booster and a collider. That CEPC booster needs to boost the beam energy from 10 GeV to 45.5 GeV brings many difficulties to fabricate and measure the dipole magnet. One of the practical way to avoid the low ?field...
Laser Wakefield Acceleration (LWFA) of charge particles (for example: electron beam) has potential to drastically reduce the size of the future particle accelerators. Owing to its compact size, even for GeV class acceleration of particles, LWFA has ability to serve the broad user communities of the next generation of radiation sources based on free-electron-laser (FEL) [1]. *MIRAI project is...
Electron acceleration driven by laser wakefield using a laser pulse with circular polarization is studied with the objective to generate high-quality electron bunches with narrow energy spread and small emittance. In order to inject electrons into the accelerating phase of the plasma wave, a density transition shaped as bump is employed. Using particle-in-cell simulations, we demonstrate the...
Electron–photon scattering, or Thomson/Compton scattering, is one of the most fundamental mechanisms in electrodynamics, underlying laboratory and astrophysical sources of high-energy X-rays. After a century of studies, it is only recently that sufficiently high electromagnetic field strengths have been available to experimentally study the nonlinear regime of the scattering in the laboratory....
Direct laser acceleration (DLA) of electron with intense high order modes of Laguerre Gaussian (LG) laser beam is investigated theoretically. The electron laser interaction is found to be sensitive with the radial (p) and azimuthal (m) mode indices for a polarized LG laser beam. Depending upon the order of mode indices (p,m), it is possible to derive the electron dynamics and energy gain with...
A plasma source is a vital part in laser wakefield acceleration (LWFA) and a gas cell is one of the main sources for that purpose. In our laboratory, we have developed diverse capillary plasma sources for LWFA in recent years. In this talk, development and characterization of a special gas cell with a longitudinal density tapering are presented, in which a higher electron acceleration energy...
Both 3D quasi-static PIC code and the quasi-3D PIC code using azimuthal decomposition method can obtain 100-1000 times speedup than the normal PIC code when modeling the plasma wake field accelerator. However, when pursuing higher energy and finer physics in the PWFA problems, a code that can cost less computing resources is required. Therefore, we apply the azimuthal decomposition method in...
We review the activity of four research groups:
- theoretical group that develops a quasi-static code LCODE for simulations of plasma wakefield acceleration and makes numerical and theoretical studies of plasma based accelerators;
- theoretical group that studies collective relaxation of electron beams and THz radiation from plasmas;
- group that develops novel W-band accelerating...
Studies of plasma-based acceleration techniques rely heavily on numerical simulations. The development of computationally simple models is an important part of researches. Quasistatic approximation is the fastest one but it does not take into account the self-trapping of plasma electrons in bubble regimes. The fraction of such particles is small compared to all plasma electrons. We calculate...
We will present the recent results which include: relativistic self-trapping regime of laser pulse propagation in the near critical density plasma, betatron wakefield radiation of record brightness and hardness, effective laser production of gammas, positrons, and photonuclear particles from optimized electron acceleration in low-density targets, shielded radiography with gamma rays from...
Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS) is the leading Russian center on high power laser-plasma interaction. It includes 0.5 PW OPCPA laser facility PEARL. The report will provide an overview of the most significant areas of research carried out at the facility, which includes research in the field of laboratory astrophysics, particle acceleration, and photon...
Based on the research experience of CLAPA [1,2] (Compact Laser Plasma Accelerator), a new laser accelerator used for proton therapy facility named CLAPA-II [3] is proposed and under design by PKU. This facility will for the first time adopt the near critical density target, consisted of the self-sustained foil material and the carbon nanotube, as the key technology in laser-driven ion...
High energy ion acceleration beyond 10 MeV is driven by high intensity lasers in the Target Normal Sheath Acceleration (TNSA) regime.
However, contaminants on a solid target surface degrade the performance of heavy ion acceleration.
We proposed the tape target with heating to supply contamination-free targets with long term operation.
In this presentation, laser-driven ion acceleration...
