| Autor: |
Li, Ruxin, Liu, Jiansheng, Xia, Changquan, Wang, Wentao, Lu, Haiyang, Wang, Cheng, Deng, Aihua, Li, Wentao, Zhang, Hui, Liang, Xiaoyan, Leng, Yuxin, Lu, Xiaoming, Wang, Jianzhou, Shen, Baifei, Nakajima, Kazuhisa, Xu, Zhizhan |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 7/9/2012, Vol. 1462 Issue 1, p143-148, 6p |
| Abstrakt: |
Near-GeV electron beam generation from a two-stage laser wakefield accelerator (LWFA) is reported. Electron injection and acceleration are separated into two distinct LWFA stages and controlled independently from each other by employing two gas cells filled with a He/O2 mixture and pure He gas, respectively. Electrons with a Maxwellian spectrum, generated from the injection stage assisted by ionization-induced injection, are seeded into the acceleration stage with a 3-mm long gas cell and accelerated to produce a 0.8-GeV quasimonoenergetic electron beam for a 45 TW 40 fs laser pulse, corresponding to an acceleration gradient of 187 GV/m. In the injection stage, the produced electron beam properties can be optimized by adjusting the input laser intensity and the plasma density so that quasimonoenergetic electron beams are obtained owing to the self-focusing effects of the laser beam. The ionization-induced injection scheme has been extensively employed for a capillary discharge plasma waveguide to demonstrate channel-guided LWFA beyond 1 GeV. Using a 4-cm capillary made of oxygen containing acrylic resin results in optically guiding 130 TW 55 fs laser pulse that accelerates electrons up to 1.8 GeV in contrast with no electron acceleration in a polyethylene capillary free of oxygen. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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