With the stat-of-the-art laser technique, the quality of electron beam generated from LPA （laser-plasma accelerator） is now becoming much better. The natural merits of electron beam from LPA, e.g., high peak current...With the stat-of-the-art laser technique, the quality of electron beam generated from LPA （laser-plasma accelerator） is now becoming much better. The natural merits of electron beam from LPA, e.g., high peak current, ultra-low emittance and ultra-short bunch length, etc., pave the way to the novel light sources, especially in the realm of developing much more compact x-ray light sources, e.g., table-top XFEL （x-ray free-electron laser）. However, the radiation power is limited by the rather larger energy spread than conventional radio-frequency electron LINAC （linear accelerator）. Luckily, much more power could be extracted by using the undulator with transverse gradient when energy spread effect could be compensated. In this paper, we introduce a novel soit x-ray light source driven by LPA together with TGU （transverse gradient undulator） technique, meanwhile we present a simple idea on how to achieve much higher rep-rate （e.g., -100 kHz） FELs （free-electron lasers） boosted by TGU based on storage rings.展开更多
Core fueling is plasmas to reach enhanced confinement regime and elevate output fusion power. However it is not easy to do so. Making use of the 2-D Kuteev lentil model, including kinetic effects, we find that existin...Core fueling is plasmas to reach enhanced confinement regime and elevate output fusion power. However it is not easy to do so. Making use of the 2-D Kuteev lentil model, including kinetic effects, we find that existing pellet injection techniques will not meet core-fueling requirements for ITER-FEAT. A pressureas high as 254 MPa should be applied to a pellet accelerator 200 cm-long single-stage pneumatic gun, in order to accelerate a pellet of radius rpo = 0. 5 cm to a velocity of νp0, 24 × 10^5cm·s^-1 penetrating 100 cm into the ITER plasma core.展开更多
The beam matching status between the two isochronous cyclotrons in the Heavy Ion Research Facility a the Lanzhou-Cooling Storage Ring(HIRFL-CSR)is described.Several methods which can be used to accomplish 100% matchin...The beam matching status between the two isochronous cyclotrons in the Heavy Ion Research Facility a the Lanzhou-Cooling Storage Ring(HIRFL-CSR)is described.Several methods which can be used to accomplish 100% matching are proposed.By comparing of them,the best method is determined.The advantage due to this method i discussed.展开更多
基金The authors would like to thank Huang, Z., and Ding, Y. from SLAC and Feng, C., Deng, H., Lan, T., Shen, L., Wang, X. and Liu, B. from SINAP for helpful discussions. The authors are grateful for the support of Major State Basic Research Development Program of China （No. 2011CB808300）, and Natural Science Foundation of China （No. 11075199）.
文摘With the stat-of-the-art laser technique, the quality of electron beam generated from LPA （laser-plasma accelerator） is now becoming much better. The natural merits of electron beam from LPA, e.g., high peak current, ultra-low emittance and ultra-short bunch length, etc., pave the way to the novel light sources, especially in the realm of developing much more compact x-ray light sources, e.g., table-top XFEL （x-ray free-electron laser）. However, the radiation power is limited by the rather larger energy spread than conventional radio-frequency electron LINAC （linear accelerator）. Luckily, much more power could be extracted by using the undulator with transverse gradient when energy spread effect could be compensated. In this paper, we introduce a novel soit x-ray light source driven by LPA together with TGU （transverse gradient undulator） technique, meanwhile we present a simple idea on how to achieve much higher rep-rate （e.g., -100 kHz） FELs （free-electron lasers） boosted by TGU based on storage rings.
文摘Core fueling is plasmas to reach enhanced confinement regime and elevate output fusion power. However it is not easy to do so. Making use of the 2-D Kuteev lentil model, including kinetic effects, we find that existing pellet injection techniques will not meet core-fueling requirements for ITER-FEAT. A pressureas high as 254 MPa should be applied to a pellet accelerator 200 cm-long single-stage pneumatic gun, in order to accelerate a pellet of radius rpo = 0. 5 cm to a velocity of νp0, 24 × 10^5cm·s^-1 penetrating 100 cm into the ITER plasma core.
文摘The beam matching status between the two isochronous cyclotrons in the Heavy Ion Research Facility a the Lanzhou-Cooling Storage Ring(HIRFL-CSR)is described.Several methods which can be used to accomplish 100% matching are proposed.By comparing of them,the best method is determined.The advantage due to this method i discussed.
