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| 1 | Design of S-band re-entrant cavity BPM显示文摘An S-band cavity BPM is designed for a new injector for HLS (Hefei Light Source). It consists of two cavities that work on 2448 MHz: a re-entrant position cavity tuned to TM110 mode and a reference cavity tuned to TM010 mode. Cut-through waveguides are used as pickups to suppress the monopole signal. Simulations with different assumption of dimension change are performed to evaluate errors caused by mechanical error and give general tolerance. Design of electronics is given. Theoretical resolution of this design is 31 nm. | LUO Qing SUN Baogen HE Duohui | 2009 | Nuclear Science and Techniques2009，20，3： | 4 |
| 2 | Physics issues in diffraction limited storage ring design显示文摘Diffraction limited electron storage ring is considered a promising candidate for future light sources,whose main characteristics are higher brilliance,better transverse coherence and better stability.The challenge of diffraction limited storage ring design is how to achieve the ultra low beam emittance with acceptable nonlinear performance.Effective linear and nonlinear parameter optimization methods based on Artificial Intelligence were developed for the storage ring physical design.As an example of application,partial physical design of HALS(Hefei Advanced Light Source),which is a diffraction limited VUV and soft X-ray light source,was introduced.Severe emittance growth due to the Intra Beam Scattering effect,which is the main obstacle to achieve ultra low emittance,was estimated quantitatively and possible cures were discussed.It is inspiring that better performance of diffraction limited storage ring can be achieved in principle with careful parameter optimization. | FAN Wei BAI ZhengHe GAO WeiWei FENG GuangYao LI WeiMin WANG Lin HE DuoHui | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，5： | 2 |
| 3 | Measurement and analysis of movement of BPM vacuum chamber for HLS显示文摘 | Cao Yong Sun Baogen He Duohui | 2008 | Chinese Physics C2008，32，1： | 1 |
| 4 | Design and cold test of S-BAND cavity BPM for HLS显示文摘An S-band cavity BPM is designed for a new injector in National Synchrotron Radiation Laboratory. A re-entrant position cavity is tuned to the TM110 mode as position cavity. Cut-through waveguides are used as pickups to suppress the monopole signal. Theoretical resolution of this design is 31 nm. A prototype cavity BPM system is manufactured for off-line cold tests. The wire scanning method is used to calibrate the BPM and estimate the performance of the on-line BPM system. A cross-talk problem has been detected during the cold test. Racetrack cavity BPM design can be used to suppress the cross-talk. With the nonlinear effect being ignored, transform matrix can be used to correct cross-talk. Analysis of cold test results shows that the position resolution of prototype BPM is better than 3 μm. | LUO Qing SUN BaoGen JIA QiKa HE DuoHui FANG Jia | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，S2： | 1 |
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