경 X-선 발생을 위한 고차조화파 방식의 자유전자레이저 설계 연구: The design study for a hard X-ray generation by using high harmonic generation free electron laser

by Hye Jin Kim (MS Candidate)

Friday Nov 11, 2011, 1:30 PM → 1:45 PM Asia/Seoul

216-1호 (제1과학관)

Free Electron Laser(FEL) is, which consists of the linear accelerator, bunch compressor and undulator, which is one of the candidates of next generation light source. It can be produced high power (~GW) and high peak brilliant (~1024) light. FEL are classified by the structure and elements of the undulator part. Most of the FEL accelerator facility in the world prefer the Self Amplified Spontaneous Emission (SASE) FEL. It based on the theory of micro-bunching due to the radiation caused by the elections in undulator. But it has small noise to signal ratio due to the large noise. Many facility develop the new technology to decrease the noise in light. The HHG-FEL is one of the them. HHG-FEL is used the HHG laser for making the micro-bunching in the bunch in the modulator. The HHG-FEL scheme was investigated to produce a hard X-ray light of amplified, longitudinally coherent and short wavelength. For the study of realistic case, the start-to-end(S2E) simulation was performed. From the results of S2E, the parameters of the electron beam which has the 6.4GeV of energy beams and 0.4 mm-mrad of normalized transverse emittance was calculated by using elegant code. For the intense output of HHG FEL, we performed the optimizations of the length of undulator periods with strength of the poles and angle of the chicane. We show the results of design study and optimization of the HHG FELs through the steady state and time dependent simulations, which could produced wavelength of 1.03 A with around 4 GW output average power with total system length of 70m.

Thesis Advisor: Prof. Eun San Kim