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Guiding of 100 TW Relativistic Laser Pulses by 10 mm Plasma Channels

100TW相対論的レーザーパルスの10mmプラズマチャネルでのガイディング

Koga, J. K.; Chen, L.-M.; 小瀧 秀行; 中島 一久; Bulanov, S. V.; 田島 俊樹; Gu, Y. Q.*; Peng, H. S.*; Hua, J. F.*; An, W. M.*; Tang, C. X.*; Lin, Y. Z.*

Koga, J. K.; Chen, L.-M.; Kotaki, Hideyuki; Nakajima, Kazuhisa; Bulanov, S. V.; Tajima, Toshiki; Gu, Y. Q.*; Peng, H. S.*; Hua, J. F.*; An, W. M.*; Tang, C. X.*; Lin, Y. Z.*

100TW, 30fsの相対論的強度のレーザーを長いスリットガスジェット(1.2$$times$$10mm$$^{2}$$)へ集光し、レーザー・プラズマ相互作用により電子を発生させる最初の実験を行った。10mmの、レイリー長の20倍となるプラズマチャネルの形成が確認された。このチャネルの特長として、レーザーの偏向,ホース効果,キャビティの形成が確認された。この長いチャネルの形成と同時にコリメートされた(エミッタンス0.8$$pi$$mm mrad),高エネルギーの準単色電子($$sim$$70MeV)の発生が確認された。このときの1MeV以上の電子の電荷量は 10nC/shotであり、これは長いチャネル形成の効果によるものと考えられる。

First experiments for electron acceleration with the laser-gas plasma interaction have been carried out with 30 fs, 100 TW relativistic Ti:Sapphier laser pulse into a long slit (1.2 $$times$$ 10 mm$$^2$$) gas plasma. The 10 mm length plasma channel formed that was longer than 20 times the Rayleigh length. Plasma density was the key factor for this long channel stimulation under 100 TW laser pulse irradiation that was much higher than critical power for relativistic self-focusing. For the first time, channel characteristics such as laser bending, hosing and cavity formation were demonstrated experimentally. In case of long channel guiding, accelerated electron bunch was tightly collimated with low emmitance $$< 0.8 pi$$ mm mrad and quasi-monoenergetic electron bunch ($$sim$$ 70 MeV) was obtained as well. Accelerated electron charge current with electron energy $$>$$ 1 MeV was $$sim$$ 10 nC/shot which was highest value in laser accelerator, to our knowledge, and ascribed to the contribution of long plasma channel. These well controlled laser-driven acceleration is an important cornerstone of relativistic engineering.

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