PAC2013 - List of Authors (Zou, 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.

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.