IPAC2014 - List of Authors (Zou, Y.)

Paper	Title	Page
MOPRI091	Resonant Slow Extraction in Synchrotrons by Using Anti-symmetric Sextupole Fields	827
SUSPSNE044	use link to see paper's listing under its alternate paper code
	Y. Zou, J.Y. Tang IHEP, Beijing, People's Republic of China
	This paper proposes a novel method for non-resonant slow extraction by using special anti-symmetric sextupole field in synchrotrons. The method has the potential in applications asking for stable slow extraction and in the halo collimation of very large machine such as LHC. Our studies show that the slow extraction by using anti-symmetric sextupole field has some advantages compared to the normal sextupole field which is the normal extraction method. One of them is that it can work at almost arbitrary tune, so that it can avoid the problem of the intensity variation caused by the ripples of magnet supplies. Studies by Hamiltonian theory and simulations which meet well show that the stable region only depends on the anti-symmetric sextupole field strength and the particles outside will be driven out in two directions which are similar to the second-order resonant extraction but with spiral steps as in the third-order resonance extraction. The beam can be extracted with a very stable intensity by gradually increasing the field strength. The multi-particle simulations by a self-made program have been carried out with a proton lattice designed for proton therapy.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI091
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THPRO111	Control System for BEPCII Linac Power Sub-system	3156
	X. Wu, X.C. Kong, Q. Le, S. Sun, Y. Zou IHEP, Beijing, People's Republic of China
	Power subsystem has been upgraded for energy improvement of the BEPCII Linac. As a result, new control system was in need. This paper proposes the designing and implementation about the power-supply control system. There are 156 sets of power supply in the system, which is divided into 6 parts, according to function. The control system is intended to make operations more convenient and efficient in beam regulation, which provides functions to meet such situations, like single regulation; restore the beam configures from data files; one-button to switch the electronic polarity (E-/E+). What’s more, the software provides a method of slow-change to protect the power supplies, when value change is too steep. Compare to the old system, this new software is more maintainable and extensible. This software is based on Qt, the GUI library for C++, and connects to the control box through the EPICS (Experimental Physics and Industrial Control System). The whole 156 sets of power supply are controlled by control boxes, which is ARM+FPGA (CPLD)-Structure front-end IO. This control system has assembled in BEPCII LINAC in September, which plays an important part in the following working.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO111
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THPRO112	Beam Dynamics Analysis in the Beam Halo Experiments at IHEP	3159
	H. Jiang, S. Fu, C. Meng, J. Peng, Y. Zou IHEP, Beijing, People's Republic of China
	We have measured the beam parameters properly, and also found the RMS matched beam. Now we simulate the matched beam and the mismatched beam using the IMPACT and TraceWin code. We find the simulations can succeed to reproduce the beam profiles without halo for both matched and mismatched beam, but there are some differences for the beam with halo.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO112
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

MOPRI091

Resonant Slow Extraction in Synchrotrons by Using Anti-symmetric Sextupole Fields

827

SUSPSNE044

use link to see paper's listing under its alternate paper code

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

This paper proposes a novel method for non-resonant slow extraction by using special anti-symmetric sextupole field in synchrotrons. The method has the potential in applications asking for stable slow extraction and in the halo collimation of very large machine such as LHC. Our studies show that the slow extraction by using anti-symmetric sextupole field has some advantages compared to the normal sextupole field which is the normal extraction method. One of them is that it can work at almost arbitrary tune, so that it can avoid the problem of the intensity variation caused by the ripples of magnet supplies. Studies by Hamiltonian theory and simulations which meet well show that the stable region only depends on the anti-symmetric sextupole field strength and the particles outside will be driven out in two directions which are similar to the second-order resonant extraction but with spiral steps as in the third-order resonance extraction. The beam can be extracted with a very stable intensity by gradually increasing the field strength. The multi-particle simulations by a self-made program have been carried out with a proton lattice designed for proton therapy.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI091

Export •

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

THPRO111

Control System for BEPCII Linac Power Sub-system

3156

X. Wu, X.C. Kong, Q. Le, S. Sun, Y. Zou
IHEP, Beijing, People's Republic of China

Power subsystem has been upgraded for energy improvement of the BEPCII Linac. As a result, new control system was in need. This paper proposes the designing and implementation about the power-supply control system. There are 156 sets of power supply in the system, which is divided into 6 parts, according to function. The control system is intended to make operations more convenient and efficient in beam regulation, which provides functions to meet such situations, like single regulation; restore the beam configures from data files; one-button to switch the electronic polarity (E-/E+). What’s more, the software provides a method of slow-change to protect the power supplies, when value change is too steep. Compare to the old system, this new software is more maintainable and extensible. This software is based on Qt, the GUI library for C++, and connects to the control box through the EPICS (Experimental Physics and Industrial Control System). The whole 156 sets of power supply are controlled by control boxes, which is ARM+FPGA (CPLD)-Structure front-end IO. This control system has assembled in BEPCII LINAC in September, which plays an important part in the following working.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO111

Export •

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

THPRO112

Beam Dynamics Analysis in the Beam Halo Experiments at IHEP

3159

H. Jiang, S. Fu, C. Meng, J. Peng, Y. Zou
IHEP, Beijing, People's Republic of China

We have measured the beam parameters properly, and also found the RMS matched beam. Now we simulate the matched beam and the mismatched beam using the IMPACT and TraceWin code. We find the simulations can succeed to reproduce the beam profiles without halo for both matched and mismatched beam, but there are some differences for the beam with halo.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO112

Export •

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