Speaker
Prof.
Mitsuo Nakai
(Institute of Laser Engineering, Osaka University)
Description
The GEKKO-EXA project[1] was revised depending on the domestic user’s demand. Here presented is a revised proposal for the GEKKO-EXA project. The project is aiming at the investigation of the physics under the intense laser field up to 10^24 W/cm^2.
As for the future application of the intensity laser, the intensity of 10^23W/cm^2 is one of the mile stone to be overcome since, in the region of radiation-dominated plasma, effective high energy gamma ray flush and its abundant applications are expected. From the physical interest, the process itself is to be demonstrated. The remedy for the radiation reaction in the analysis is still controversial and to be examined by experiment. Technologically, the repetitive high intensity laser system with the output power of several PW is desired to be developed. In the new design of the GEKKO-EXA, the split disk laser system[2] was picked up to deliver the k-J sub-nanosecond pulse with 0.01 Hz which will potentially provide a several PW pulse at the same repetition.
At the intensity of 10^24 W/cm^2, QED avalanche is expected[3] and electron-positron plasma might be created effectively. As a final amp, the existing amplifier chain of the LFEX are to be utilized and the final output of 500 J in 20 fs, which makes 25 PW in the revised design of the GEKKO-EXA.
The preliminary computational simulation for the experiments such as the QED avalanche will be also reported with the revised design of the laser system.
[1] J. Kawanaka, LFEX- and EXA-team, International Committee on Ultra Intense Laser Conference (ICUIL 2010), Watkins Glen, New York, September 26-October 1, (2010).
[2] H. Okada, H. Yoshida, H. Fujita and M. Nakatsuka
Opt. Commun.261, p342-348 (2006), ibid 266, pp274-279 (2006).
[3] A. R. Bell, Phys. Rev. Lett. 101, 200403(2008).
Primary author
Prof.
Mitsuo Nakai
(Institute of Laser Engineering, Osaka University)
