Guo, Z. Y.

Paper	Title	Page
TUC3MA01	ILC DR Alternative Lattice Design	94
	Y. Sun, Z. Y. Guo PKU/IHIP, Beijing J. Gao IHEP Beijing, Beijing
	The International Linear Collider (ILC) which is based on super-conducting RF acceleration technology requires the damping rings to provide beams with extremely small equilibrium emittances, and large acceptance to ensure good injection efficiency for high emittance, high energy spread beam from the positron source. In order to reduce the cost for ILC damping rings, an alternative lattice which is different from the baseline configuration design has been designed with modified FODO arc cells，and the total quadrupole number has been reduced by half. At the same time, to decrease the total cost involved in constructing access shafts needed to supply power, cryogenics etc. for the wigglers and other systems, the number of wiggler sections is decreased from 8 to 4, and further to 2. This new lattice has been optimised to have a good dynamic aperture. This alternative ILC damping ring lattice design will reduce the cost largely compared with the baseline design.
	Slides
TUPMA005	Simulation Study on Bunch Lengthening	106
	Y. Sun, Z. Y. Guo PKU/IHIP, Beijing J. Gao IHEP Beijing, Beijing
	The bunch lengthening phenomenon is resulted from one of the most severe single bunch instabilities in electron storage rings. As for BEPCII, controlling the bunch length is the most critical task to fulfil the designed luminosity goal. A new code is developed to calculate the single bunch length and energy spread in storage rings using FORTRAN. In this code, the wake field is calculated using an analytical formula. The bunch length and energy spread under different bunch current are calculated for BEPCII. The tracking results clearly show that the microwave instability threshold is around 65 mA for BEPCII storage ring. The tracking results of this code are in good accordance with those from other codes.
TUPMA006	Study on the BEPCII Lattice	109
	Y. Sun, Z. Y. Guo PKU/IHIP, Beijing J. Gao IHEP Beijing, Beijing
	BEPCII, the upgrading project of the Beijing Electron-Positron Collider (BEPC), has been designed with a luminosity of 1033 cm-2s-1 at the -charm energy region. According to the beam-beam simulation results, the luminosity of BEPCII with a crossing collision angle of 11 mrad is about 0.50×1033 cm-2s-1 with the original operation mode at the working point of 6.53/5.58. To increase the operating luminosity of the BEPCII, a low momentum compaction factor (?P) collision mode has been studied which can increase the luminosity to 0.54×1033 cm-2s-1. If the bunch length of the low ?P mode is reduced from 1.5 cm to 1.2 cm, a mode with vertical beta function at IP equal to 1.2 cm could push the luminosity to 0.828×1033 cm-2s-1 at the working points 6.53/5.56. Also, the BEPCII synchrotron radiation mode is optimized to get a larger dynamic aperture and much more stable tunes.
TUPMA070	Progress of RFQ Accelerator at Peking University	214
	Z. Y. Guo, J.-E. Chen, J. X. Fang, S. L. Gao, J. F. Guo, W. G. Li, Y. R. Lu, S. X. Peng, Z. Z. Song, Z. Wang, X. Q. Yan, J. X. Yu, M. L. Yu, C. Zhang, K. Zhu PKU/IHIP, Beijing
	The progress of two RFQ accelerators at Peking University is presented: one is Separated Function RFQ (SFRFQ), which separates the focusing and acceleration of traditional RFQ to get higher acceleration efficiency. The first prototype of the SFRFQ is designed to accelerate O+ from 1MeV to 1.5MeV and used as a postaccelerator for ISR RFQ-1000 (Integral Split Ring) [1]. The other is high current deuteron 201.25MHz RFQ, it will accelerate 50mA D+ beam to 2MeV with a duty cycle of 10%. The design study of SFRFQ and high current Deuteron RFQ accelerator are outlined.
THZH103	The Progress of Accelerator Mass Spectrometry and their Applications in China	597
	J.-E. Chen, Z. Y. Guo, K. X. Liu PKU/IHIP, Beijing
	The AMS technology and their applications have been developed at Peking University, China Institute of Atomic Energy and Chinese Academy of Sciences since 1980s’. In this presentation, the AMS facilities in China are described and the applications mainly in the field of archaeology are presented. Interesting results about the establishment of Chronology frame of Xia-Shang-Zhou dynasties based on cultural remains at Longshan, Er-li-tou. Xinzha and Tianma-Qucun Site etc. are given as examples. More then one hundred samples of oracle bone were studied for archaeological radio-carbon dating with the AMS facility at Peking University. AMS applications in the fields of geosciences, environmental and biomedical sciences are introduced as well.
	Slides