PAC2013 - List of Authors (Tang, J.Y.)

Paper	Title	Page
MOPMA03	Studies on Short-Bunch Extraction at CSNS RCS	297
	Y. Zou, J.F. Chen, J.Y. Tang IHEP, Beijing, People's Republic of China
	White neutron application requires short pulse length to obtain high time resolution for nuclear data measurements. Back-streaming neutrons at the CSNS spallation target are to be employed as a white neutron source. The available high RF voltage in the high intensity rapid cycling synchrotron (RCS) of CSNS makes it possible to extract very short bunches by using the bunch rotation method. A special desynchrotronization method is designed to avoid the slow acceleration during the bunch rotation when magentic field is still ramping. Different extraction scenarios together with the changes in the injection have been studies for the purpose. Together with the calculations, multiple simulations have been carried out to show the effectiveness of the method. With a sacrifice of about two-third beam power, the rms bunch length of the extracted beam can be reduced to about one tenth of the one in the nominal operation mode. Other scenarios also show the improvement in the bunch length. Space charge effects and beam loading effect have been taken into account in designing the schemes.

TUPBA03	Preliminary Accelerator Design of a Circular Higgs Factory in China	523
	J.Y. Tang, Y.W. An, S. Bai, J. Gao, H. Geng, Y.Y. Guo, Q. Qin, D. Wang, N. Wang, S. Wang, Y. Wang, M. Xiao, G. Xu, S.Y. Xu, Y. Yue, J.Y. Zhai, C. Zhang IHEP, Beijing, People's Republic of China
	Since the Higgs was found last summer at the LHC in CERN, Higgs factory was proposed as a future accelerator. A circular Higgs factory was considered in IHEP, with the possibility of converting the electron machine to be a pp collider in the future. Some accelerator physics problems are being studied and a preliminary design of the rings is given.

THPSM04	Conceptual Physics Design for the China-ADS Linac	1397
	J.Y. Tang, P. Cheng, H. Geng, Z. Guo, Z. Li, C. Meng, H.F. Ouyang, S. Pei, B. Sun, J.L. Sun, F. Yan, Z. Yang, C. Zhang IHEP, Beijing, People's Republic of China Y. He, Y. Yang IMP, Lanzhou, People's Republic of China
	The China-ADS project was launched in 2011 to pursue the R&D on key technologies towards a final demonstration facility with the capability of more than 1000 MW thermal power. The driver linac is defined to be 1.5 GeV in energy, 10 mA in current and in CW operation mode. It employs the superconducting structures except the RFQs. To meet the extremely high reliability and availability, the linac is designed with much installed margin and fault tolerance, including hot-spare injectors and local compensation method for key element failures. The accelerator complex consists of two parallel 10-MeV injectors, a joint medium-energy beam transport line, a main linac and a high-energy beam transport line. The conceptual accelerator physics design including beam dynamics studies with multiparticle simulations is presented here.

Paper

Title

Page

Studies on Short-Bunch Extraction at CSNS RCS

297

Y. Zou, J.F. Chen, J.Y. Tang
IHEP, Beijing, People's Republic of China

White neutron application requires short pulse length to obtain high time resolution for nuclear data measurements. Back-streaming neutrons at the CSNS spallation target are to be employed as a white neutron source. The available high RF voltage in the high intensity rapid cycling synchrotron (RCS) of CSNS makes it possible to extract very short bunches by using the bunch rotation method. A special desynchrotronization method is designed to avoid the slow acceleration during the bunch rotation when magentic field is still ramping. Different extraction scenarios together with the changes in the injection have been studies for the purpose. Together with the calculations, multiple simulations have been carried out to show the effectiveness of the method. With a sacrifice of about two-third beam power, the rms bunch length of the extracted beam can be reduced to about one tenth of the one in the nominal operation mode. Other scenarios also show the improvement in the bunch length. Space charge effects and beam loading effect have been taken into account in designing the schemes.

TUPBA03

Preliminary Accelerator Design of a Circular Higgs Factory in China

523

J.Y. Tang, Y.W. An, S. Bai, J. Gao, H. Geng, Y.Y. Guo, Q. Qin, D. Wang, N. Wang, S. Wang, Y. Wang, M. Xiao, G. Xu, S.Y. Xu, Y. Yue, J.Y. Zhai, C. Zhang
IHEP, Beijing, People's Republic of China

Since the Higgs was found last summer at the LHC in CERN, Higgs factory was proposed as a future accelerator. A circular Higgs factory was considered in IHEP, with the possibility of converting the electron machine to be a pp collider in the future. Some accelerator physics problems are being studied and a preliminary design of the rings is given.

THPSM04

Conceptual Physics Design for the China-ADS Linac

1397

J.Y. Tang, P. Cheng, H. Geng, Z. Guo, Z. Li, C. Meng, H.F. Ouyang, S. Pei, B. Sun, J.L. Sun, F. Yan, Z. Yang, C. Zhang
IHEP, Beijing, People's Republic of China
Y. He, Y. Yang
IMP, Lanzhou, People's Republic of China

The China-ADS project was launched in 2011 to pursue the R&D on key technologies towards a final demonstration facility with the capability of more than 1000 MW thermal power. The driver linac is defined to be 1.5 GeV in energy, 10 mA in current and in CW operation mode. It employs the superconducting structures except the RFQs. To meet the extremely high reliability and availability, the linac is designed with much installed margin and fault tolerance, including hot-spare injectors and local compensation method for key element failures. The accelerator complex consists of two parallel 10-MeV injectors, a joint medium-energy beam transport line, a main linac and a high-energy beam transport line. The conceptual accelerator physics design including beam dynamics studies with multiparticle simulations is presented here.