Development of high harmonic beamline with high photon flux comparable to SPring-8

该项目追求的是将高次谐波光束线的光子通量增强到同步加速器设施SPirng-8的通量。光束线是基于时间延迟补偿单色器，选择一个单一的谐波与脉冲持续时间保存。利用相位匹配在填充稀有气体的中空光纤中产生高次谐波，提高了光子通量。靶上的光子通量在19次谐波（= 29.6eV）下为7×109光子/秒，与UV-SOR相当。此外，通过在0阶反射处使用一个光栅，虽然脉冲宽度变为200 fs，但是光子通量增强了10倍。因此，成功地开发了与SPring-8相当的高谐波光束线。

This project pursues the photon-flux enhancement of a high harmonic beamline upto the flux of the synchrotron facility SPirng-8. The beamline is based on a time-delay compensated monochromator, selecting a single harmonic with the pulse duration preserved. The photon flux was increased by exploiting phase match for high harmonic generation inside a hollow fiber filled with rare gas as nonlinear medium. The photon flux on target was 7×109 photons/sec at the 19th harmonic (=29.6 eV), comparable to that of UV-SOR. Furthermore, the photon flux was enhanced by 10 times by using one grating at the 0th order reflection, although the pulse duration became 200 fs. Consequently, the high harmonic beamline comparable to SPring-8 was successfully developed.