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WEZZPLS1 |
Experimental Demonstration of External Injection From a Linac into a LWFA with ~100% Capture Efficiency | |
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| Staging of conventional accelerators and advanced plasma-based accelerators can boost the beam energy while at the same time better control the beam quality, therefore it is essential for high-energy applications such as TeV-level colliders. Here we present the first successful demonstration of external injection from a linear accelerator (LINAC) into a laser wakefield accelerator (LWFA) and the subsequent acceleration with ~100% capture efficiency. Stable 31MeV, 20fC electron beams from the LINAC were velocity bunched to the length of ~15fs (r.m.s.) in the high-gradient photocathode RF gun and then external injected into the linear wakefield excited by the 10TW, 42fs laser. The experimental results show that nearly all the electrons can be mono-energetically accelerated and the maximum energy gain reaches 1.8MeV in a 6-mm long plasma, corresponding to an average gradient of about 300MV/m. High capture efficiency of external injection has also been systematically validated by 3D PIC simulations. This paves the way toward the development of high-energy particle accelerators for future colliders. | ||
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| WEPTS034 | Generation of Sub-Femtosecond Electron Beams and Electron Bunch Trains With High Form Factor Using Wake Field Structures | 3174 |
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| In this paper, we propose two beam manipulation methods with wakefield structures in a photo-injector. First, we propose a simple scheme to compensate non-linear effects during ballistic bunching by using a wakefield structure. Simulations have shown beams of 1 pC charge can be compressed to 1.56 fs rms, and even shorter beams (a few hundred attoseconds) can be obtained with bunch charge well below 1 pC. In the second part, a method of producing bunch trains with high form factor is proposed by using multiple wake-field structures. Simulation results have shown the production of a train with a form factor of 0.5 using a 1 nC beam at few-MeV energy. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPTS034 | |
| About • | paper received ※ 11 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019 | |
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| THPMP020 | Single-Shot Cascade High Energy Electron Radiography based on Strong Permanent Magnet Quadrupole Composed Imaging Lens | 3491 |
| SUSPFO085 | use link to see paper's listing under its alternate paper code | |
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| High energy electron imaging, an extension of conventional transmission electron microscopy, is suitable for imaging of thicker objects and expected to be a promising tool for diagnostics of high energy density physics (HEDP). A cascade high energy electron imaging system using two-stage imaging lenses based on strong permanent magnet quadrupoles is designed, optimized and finally installed at Tsinghua university. Encouraging result of 1.6-μm space resolution is obtained in our primary experiments, along with the clear imaging of a spherical capsule as a substitute of the targets used in inertial confinement fusion. Successful implement of cascade high energy electron imaging system is necessary for reaching better resolving power of the imaging system, and well matching of design, simulation with experimental results paves the way to high energy electron microscopy to provide full capacities for diagnostics of HEDP with sub-um and picosecond spatiotemporal resolutions. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP020 | |
| About • | paper received ※ 07 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019 | |
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