| Paper | Title | Page |
|---|---|---|
WEPMH4 |
Recent Progress on High Quality Electron Beam Generation through Plasma Based Acceleration at Tsinghua University | |
|
||
| Recent progress on plasma based acceleration at Tsinghua University will be presented. On the theory and simulation part, several ideas on how to obtain high quality electron beams with extremely high brightness through wakefield acceleration will be discussed in details,including two recently published works based on ionization injection method(PRL 111,015003,2013; PRL 112,035003,2014); On the experiment part, our recent results of high quality 20-30MeV electron beams with very low energy spread, with minimal absolute energy spread of 0.18MeV RMS and relative energy spread 0.8% RMS, will be presented. The latest results on the generation of 300-430MeV high quality electron beams (2-5% energy spread) using a 50TW laser at NCU will also be discussed. | ||
| WEPH07 | Simulation Study of Dark Current in the Thomson Scattering X-Ray Source | 38 |
|
||
| This paper focuses on the study of beam dynamics of the dark current, including the dark current generation and transmission in the photocathode injector. For the longitudinal compression of the nominal beam in the Thomson scattering X-ray source, we add a velocity bunching cavity behind the RF gun. We analyse the influence of the bunching cavity on the transmission efficiency of the dark current. At last, some methods to reduce the dark current are discussed. | ||
| WEPH22 | An X-Band Linear Accelerator with Continuously-adjustable Beam Energy | 68 |
|
||
| An X-band linac is designed to produce beam energy between 0.5MeV and 1.5MeV, and the output beam energy is continuously adjustable within this range. Two sections of linacs are combined and powered by a single microwave source. By tuning the RF phase and amplitude of the second section of the linac, the electron beam can see either acceleration or deceleration, which tunes the output energy. This paper presented the principle and the design of the linac, as well as the production of the whole system. | ||
| WEPH30 | Mechanical Stablitity Analysis on Optical Cavity Used for TTX | 81 |
|
||
| Due to the great applications of ultrafast X-ray in detecting the micro-world, the X-ray sources develop rapidly. One of X-ray sources named Laser-Electron X-ray Machine (LEXM) based on the Inverse Compton Scattering of optical cavity is very promising. Accelerator Lab of Tsinghua University has finished the basic proto-type design. This paper compares the different kinds of X-ray source, such as SR, FEL, X-ray tubes and LEXM. And this paper optimizes the optical lengths of four mirrors structure optical cavity and analysis the mechanical stabilities of two mirrors and four mirrors structure optical cavity. According to the simulation results, we choose the four mirrors structure optical cavity. | ||
THAMH1 |
Recently Progress of Tsinghua Thomson Scattering X-ray Source | |
|
||
| In the last three years, we have successfully generated high quality hard X-ray pulse at Tsinghua Thomson scattering X-ray source. The X-ray parameters, such as flux, beam profile, energy and spectrum, were measured successfully. One of the most interesting applications, x-ray phase contrast imaging, has also demonstrated on this facility. In this paper, we will show the recent progress of this facility in detail. | ||
| THAMH3 | Nonlinear Effects in the TTX-LESR | 99 |
|
||
| We are designing a Laser Electron Storage Ring (LESR) for Tsinghua Thomson scattering X-ray source (TTX). A very compact LESR is designed to increase the average flux of the generated X-ray photons through the way of increasing the repetition frequency of scattering. Considering to reduce the lengths and the number of the magnets is necessary in designing a small ring. However, we find that the nonlinear effects of dipole field become significant when the bending radii of the dipole magnets are small. In this paper, we first present the baseline design of the LESR for TTX. Both analytical analysis and simulation are carried out to study the particles' behavior around the third-order systematic resonance line 3νx = 4. The analytical results of the resonance strengths are found to agree well with results from numerical particle tracking. | ||