IPAC2015 - List of Authors (Liu, W.B.)

Paper	Title	Page
MOPWA065	Uniformization of the Transverse Beam Profile by a New Type Nonlinear Magnet	272
	G. Gu, W.B. Liu IHEP, Beijing, People's Republic of China
	The uniform particle beam is desirable in many beam applications. One method to get this type of beam distribution is using octupoles, but loss of particles in the halo will be produced by this method. To reduce the beam loss, a new type of magnet is proposed in this paper. The field in the middle region of the new type magnet is similar to the octupole magnet field, but the rate of rise decline quickly in the edge. So that the particle in the edge experience a lower magnet field, and this would result in less particle loss. We also add a mechanical structure on the new type magnet to make it possible to adjust the size of middle region. So that the magnet can adapt to different transverse dimensions of the beam, and this would further reduce particle loss. Some numerical simulations have been done respectively with octuples and the new type of magnet. The simulation results show that the new type of magnet could get the uniform distribution of particle beam with less particle loss. We are processing a magnet now, and an experiment to test the magnet will be arranged on CPHS.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWA065
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MOPTY006	Study on the Injection Beam Commissioning Software for CSNS/RCS	950
	M.Y. Huang, L. Huang, W.B. Liu, J. Qiu, S. Wang IHEP, Beijing, People's Republic of China
	Funding: Funding Agency: Work supported by National Natural Science Foundation of China (11205185, 11175020, 11175193 ) The China Spallation Neutron Source (CSNS) accelerator uses H⁻ stripping and phase space painting method of filling large ring acceptance with the linac beam of small emittance. The beam commissioning software system is the key part of CSNS accelerator. The injection beam commissioning software for CSNS contains three parts currently: painting curve control, injection beam control and injection orbit correction. The injection beam control contains two subsections: single bunch beam calculation and LRBT beam control at the foil. The injection orbit correction also contains two subsections: injection orbit correction by the calculation and injection trim power control.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPTY006
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THPF051	Beam-based Alignment Simulation on Transport Line of CSNS	3818
	Y. Li, Y.W. An, L. Huang, W.B. Liu, S. Wang IHEP, Beijing, People's Republic of China
	The China Spallation Neutron Source (CSNS) is a high beam power proton machine which needs high precise alignment. Compared to traditional optical alignment, the beam-based alignment (BBA) technique can implement higher precise alignment. This technique with two implementations is applied to the transport line of CSNS to get the transverse misalignments of beam position monitor (BPM) and quadrupole magnet by measuring BPM data under different conditions. The corresponding control system application programs were developed based on CSNS/XAL platform. The result shows the fitted result is consistent with the input result.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF051
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THPF054	XAL Development for CSNS/RCS Commissioning	3821
	Y.W. An, L. Huang, W.B. Liu, Y.D. Liu, S. Wang, Y. Wei IHEP, Beijing, People's Republic of China
	Funding: Work supported by the National Natural Science Fund Committee, contract 11405189. As a key component of the China Spallation Neutron Source (CSNS) Project, the Rapid Cycling Synchrotron (RCS) accumulates and accelerates the proton beam from 80MeV to 1.6GeV for extracting and striking the target with a repetition rate of 25Hz. A high level application programming framework code called XAL, based on Java Language with a well-performance online model, initially developed at the Spallation Neutron Source (SNS), has been installed as a part of control system via connection to EPICS for CSNS. Much of the applications have been initially established such as Tune Scan, Tune Monitor, Orbit Response Matrix Measurement, RCS Orbit Display, and Beta Function Measurement for preparing CSNS/RCS commissioning are showed in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF054
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Paper

Title

Page

Uniformization of the Transverse Beam Profile by a New Type Nonlinear Magnet

272

G. Gu, W.B. Liu
IHEP, Beijing, People's Republic of China

The uniform particle beam is desirable in many beam applications. One method to get this type of beam distribution is using octupoles, but loss of particles in the halo will be produced by this method. To reduce the beam loss, a new type of magnet is proposed in this paper. The field in the middle region of the new type magnet is similar to the octupole magnet field, but the rate of rise decline quickly in the edge. So that the particle in the edge experience a lower magnet field, and this would result in less particle loss. We also add a mechanical structure on the new type magnet to make it possible to adjust the size of middle region. So that the magnet can adapt to different transverse dimensions of the beam, and this would further reduce particle loss. Some numerical simulations have been done respectively with octuples and the new type of magnet. The simulation results show that the new type of magnet could get the uniform distribution of particle beam with less particle loss. We are processing a magnet now, and an experiment to test the magnet will be arranged on CPHS.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWA065

Export •

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

MOPTY006

Study on the Injection Beam Commissioning Software for CSNS/RCS

950

M.Y. Huang, L. Huang, W.B. Liu, J. Qiu, S. Wang
IHEP, Beijing, People's Republic of China

Funding: Funding Agency: Work supported by National Natural Science Foundation of China (11205185, 11175020, 11175193 )
The China Spallation Neutron Source (CSNS) accelerator uses H⁻ stripping and phase space painting method of filling large ring acceptance with the linac beam of small emittance. The beam commissioning software system is the key part of CSNS accelerator. The injection beam commissioning software for CSNS contains three parts currently: painting curve control, injection beam control and injection orbit correction. The injection beam control contains two subsections: single bunch beam calculation and LRBT beam control at the foil. The injection orbit correction also contains two subsections: injection orbit correction by the calculation and injection trim power control.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPTY006

Export •

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

THPF051

Beam-based Alignment Simulation on Transport Line of CSNS

3818

Y. Li, Y.W. An, L. Huang, W.B. Liu, S. Wang
IHEP, Beijing, People's Republic of China

The China Spallation Neutron Source (CSNS) is a high beam power proton machine which needs high precise alignment. Compared to traditional optical alignment, the beam-based alignment (BBA) technique can implement higher precise alignment. This technique with two implementations is applied to the transport line of CSNS to get the transverse misalignments of beam position monitor (BPM) and quadrupole magnet by measuring BPM data under different conditions. The corresponding control system application programs were developed based on CSNS/XAL platform. The result shows the fitted result is consistent with the input result.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF051

Export •

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

THPF054

XAL Development for CSNS/RCS Commissioning

3821

Y.W. An, L. Huang, W.B. Liu, Y.D. Liu, S. Wang, Y. Wei
IHEP, Beijing, People's Republic of China

Funding: Work supported by the National Natural Science Fund Committee, contract 11405189.
As a key component of the China Spallation Neutron Source (CSNS) Project, the Rapid Cycling Synchrotron (RCS) accumulates and accelerates the proton beam from 80MeV to 1.6GeV for extracting and striking the target with a repetition rate of 25Hz. A high level application programming framework code called XAL, based on Java Language with a well-performance online model, initially developed at the Spallation Neutron Source (SNS), has been installed as a part of control system via connection to EPICS for CSNS. Much of the applications have been initially established such as Tune Scan, Tune Monitor, Orbit Response Matrix Measurement, RCS Orbit Display, and Beta Function Measurement for preparing CSNS/RCS commissioning are showed in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF054

Export •

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