MEDSI2018 - List of Authors (Li, M.)

Paper

Title

Page

High-Accuracy Small Roll Angle Measurement Method Based on Dual-Grating Diffraction Heterodyne Interferometer

163

S. Tang, M. Li, H. Liang, W.F. Sheng, J. Yang
IHEP, Beijing, People's Republic of China

Funding: The work is supported by National Natural Science Foundation of China, NSFC (Grant No. 61505213).
Small roll angle (ROLL) is an crucial parameter for the motion performances of ultra-precision guide way often applied in fine mechanics and instruments of synchrotron radiation, such as long trace profiler (LTP). However, it is difficult to be measured by conventional methods including interferometer and autocollimator owing to their low sensitivities in axial direction. There is an orthogonal dilemma between measured direction and angular displacement plane for ROLL measurement. Therefore, a novel method based on dual-grating diffraction heterodyne interferometer is presented, which uses the combining scheme of diffraction grating and heterodyne interferometer to overcome the orthogonal problem. Moreover, the design of differential structure with dual-grating and grating interferometer instead of pure interferometer, is adopted to improve the practicability against the environment, e. g. air fluctuation, inconstant rotation center. It has inherited advantages of high-resolution up to 2nrad, high sampling rate up to 50kHz, and contactless by mathematical modeling and analysis. So, theoretcial and experimental verifications are both implemented to its validation.

Slides WEOAMA03 [2.304 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEOAMA03

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPH42

The Design of HEPS Front Ends

H. Shi, L. Gao, M. Li
IHEP, Beijing, People's Republic of China

High Energy Photon Source (HEPS) is a 6GeV synchrotron radiation facility to be built in Huairou, Beijing, with a perimeter of 1390.6m and 48 linear sections. In the first phase, 15 front ends will be installed, including 14 ID front ends and 1 BM front end. These front ends are divided into three categories: the standard undulator front end, the wiggler front end, and the BM front end. The peak power density that the front end bears is about 868kW/mrad², the total power is about 47kW. This paper describes the general layout design of the three different types of front end, the functions of the main components, and the finite element analysis of key devices in the HEPS front end.

Poster THPH42 [0.657 MB]

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FROAMA03

R&D of Mirror Bending Techniques in BSRF

M. Li, L. Gao, H. Han, Q. Han, X. Liu, S. Tang
IHEP, Beijing, People's Republic of China

High precision bending technology is development at Beijing Synchrotron Radiation Facility. We adopted two independent bending moment and variable width mirror geometry design, and no gravity compensation system, and use four rollers structure in long mirror bender and a special flexible hinge structure in short mirror bender. We test the benders' performance by our Flag-type LTP and get sub-200nrad RMS elliptical bending surface shape accuracy in full range, with 72h stability: 66nrad RMS for long mirror and 6nrad RMS for short mirror.

Slides FROAMA03 [13.722 MB]

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper	Title	Page
WEOAMA03	High-Accuracy Small Roll Angle Measurement Method Based on Dual-Grating Diffraction Heterodyne Interferometer	163
	S. Tang, M. Li, H. Liang, W.F. Sheng, J. Yang IHEP, Beijing, People's Republic of China
	Funding: The work is supported by National Natural Science Foundation of China, NSFC (Grant No. 61505213). Small roll angle (ROLL) is an crucial parameter for the motion performances of ultra-precision guide way often applied in fine mechanics and instruments of synchrotron radiation, such as long trace profiler (LTP). However, it is difficult to be measured by conventional methods including interferometer and autocollimator owing to their low sensitivities in axial direction. There is an orthogonal dilemma between measured direction and angular displacement plane for ROLL measurement. Therefore, a novel method based on dual-grating diffraction heterodyne interferometer is presented, which uses the combining scheme of diffraction grating and heterodyne interferometer to overcome the orthogonal problem. Moreover, the design of differential structure with dual-grating and grating interferometer instead of pure interferometer, is adopted to improve the practicability against the environment, e. g. air fluctuation, inconstant rotation center. It has inherited advantages of high-resolution up to 2nrad, high sampling rate up to 50kHz, and contactless by mathematical modeling and analysis. So, theoretcial and experimental verifications are both implemented to its validation.
	Slides WEOAMA03 [2.304 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEOAMA03
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPH42	The Design of HEPS Front Ends
	H. Shi, L. Gao, M. Li IHEP, Beijing, People's Republic of China
	High Energy Photon Source (HEPS) is a 6GeV synchrotron radiation facility to be built in Huairou, Beijing, with a perimeter of 1390.6m and 48 linear sections. In the first phase, 15 front ends will be installed, including 14 ID front ends and 1 BM front end. These front ends are divided into three categories: the standard undulator front end, the wiggler front end, and the BM front end. The peak power density that the front end bears is about 868kW/mrad², the total power is about 47kW. This paper describes the general layout design of the three different types of front end, the functions of the main components, and the finite element analysis of key devices in the HEPS front end.
	Poster THPH42 [0.657 MB]
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FROAMA03	R&D of Mirror Bending Techniques in BSRF
	M. Li, L. Gao, H. Han, Q. Han, X. Liu, S. Tang IHEP, Beijing, People's Republic of China
	High precision bending technology is development at Beijing Synchrotron Radiation Facility. We adopted two independent bending moment and variable width mirror geometry design, and no gravity compensation system, and use four rollers structure in long mirror bender and a special flexible hinge structure in short mirror bender. We test the benders' performance by our Flag-type LTP and get sub-200nrad RMS elliptical bending surface shape accuracy in full range, with 72h stability: 66nrad RMS for long mirror and 6nrad RMS for short mirror.
	Slides FROAMA03 [13.722 MB]
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)