HB2016 - List of Keywords (controls)

Paper	Title	Other Keywords	Page
MOPR018	XAL Applications Development for CSNS Transport Lines	database, linac, interface, emittance	98
	Y. Li, Z.P. Li, W.B. Liu IHEP, Beijing, People's Republic of China J. Peng CSNS, Guangdong Province, People's Republic of China
	XAL is an application programming framework initially developed at the Spallation Neutron Source (SNS). It has been employed as a part of control system via con-nection to EPICS to provide application programs for beam commissioning at the China Spallation Neutron Source (CSNS). Several XAL-based applications have been developed for Beam Transport line at CSNS and successfully applied in the MEBT and DTL-1 beam commissioning. These applications will be discussed in this paper.
Export •	reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPL025	Transient Beam Loading Based Calibration for Cavity Phase and Amplitude Setting	cavity, beam-loading, linac, resonance	250
	R. Zeng ESS, Lund, Sweden O. Troeng Lund University, Lund, Sweden
	Traditional phase scan method for cavity phase and amplitude setting is offline and hard to track the variations of environment and operation points. An alternative beam loading based calibration method is investigated in this paper, which might become useful online/real time calibration method.
Export •	reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPM5X01	Injection Painting Improvements in the J-PARC RCS	injection, power-supply, target, feedback	299
	S. Kato, K. Horino, H. Hotchi, M. Kinsho, K. Okabe, P.K. Saha, Y. Shobuda, T. Takayanagi, T. Tobita, T. Ueno JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan H. Harada JAEA, Ibaraki-ken, Japan
	In the J-PARC 3GeV RCS, the injection painting is essential method for the reduction of the space charge force. In this method, the H⁻ beam from Linac is arranged on the large phase space area of the ring orbit during multiple turns. To implement this method, painting magnets form the time variable beam orbit. Therefore, the precise output current control of the magnet power supply is required. Because the power supply controlled by mainly feedforward signal is operated, we developed the iterative tuning method for the optimum feedforward parameter determination. As a result, we could reduce the tracking error of the current compared to before. Furthermore, to improve the accuracy of the painting area size, we applied the output readjustment additionally. Because the current monitor value of the power supply was different from the actual magnetic field due to the delay in the circuit and the leakage field, we corrected the tracking of the current based on the measured painting area size determined by the analysis of the measured COD. As a result, we achieved the precise injection painting. This talk presents these improvement results of the injection painting in the RCS.
	Slides TUPM5X01 [4.122 MB]
Export •	reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEAM2Y01	Overview of the CSNS Linac LLRF and Operational Experiences During Beam Commissioning	LLRF, cavity, linac, FPGA	409
	Z.C. Mu IHEP, Beijing, People's Republic of China J. Li, M.F. Liu, L.Y. Rong, M.L. Wan, B. Wang, Z.X. Xie, X.A. Xu, Y. Yao, Z. Zhang, W. Zhou CSNS, Guangdong Province, People's Republic of China
	The CSNS Linac is comprised of RFQ, two Buncher cavities, four DTL accelerators and one Debuncher cavity. The RFQ accelerator is powered by two 4616 vacuum tubes, the maximum output power of each tube is 350kW. Three 25kW solid state amplifiers supply RF power for two Buncher cavities and the Debuncher cavity, repectively. The RF power sources of four DTL accelerators are four 3MW klystrons. Each RF power source owns a set of digital LLRF control system in order to realize an accelerating field stability of ±1% in amplitude and ±1° in phase. The front four LLRF control systems have been used in the beam commissioning of CSNS Linac from the end of 2015. This paper will introduce the design and the performance of the LLRF control system.
	Slides WEAM2Y01 [6.097 MB]
Export •	reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEAM7Y01	The Beam Delivery System of the European Spallation Source	target, multipole, proton, simulation	427
	H.D. Thomsen Aarhus University, Aarhus, Denmark S.P. Møller ISA, Aarhus, Denmark
	The European Spallation Source (ESS) will apply a fast beam scanning system to redistribute the proton beam transversely across the spallation target surface. The system operates at sweep frequencies of tens of kHz and efficiently evens out the time-averaged beam intensity within a nominal beam footprint, thus reducing the level of beam-induced material damage. A modular design approach divides the raster action in each direction across 4 independent magnet-supply systems to distribute the magnetic load, ease the peak output power per modulator, and in general reduce the impact of single points of failure. The state of the magnet design and power supply topology will be discussed.
	Slides WEAM7Y01 [6.037 MB]
Export •	reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPM4Y01	HPSim - Advanced Online Modeling for Proton Linacs	linac, simulation, DTL, GPU	444
	L. Rybarcyk LANL, Los Alamos, New Mexico, USA
	High-power proton linacs seek to operate with low and stable losses. This aspect is carefully evaluated with multi-particle beam dynamics codes during the design stage. However, it is just as important to evaluate the performance of the actual operating linac, which is typically more tedious and complicated when using these same design codes. To improve this situation, we have developed a high-performance, multi-particle online modeling tool, HPSim, with the goal of providing near real-time simulation results for our 800-MeV proton linac at Los Alamos. This presentation will cover the motivation, code features, benefits and applications.
	Slides WEPM4Y01 [7.537 MB]
Export •	reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THAM4X01	Investigation to Improve Efficiency and Availability in Control and Operation of Superconducting Cavity at ESS	cavity, operation, klystron, LLRF	474
	R. Zeng ESS, Lund, Sweden O. Troeng Lund University, Lund, Sweden
	The higher efficiency and higher availability (fault-tolerant oriented) of RF&Cavity system (with beam loading) to operate at, the more dynamic details needs to be identified, so as to have the abilities (a) to work at nonlinearities, (b) to work close to limitation, and (c) to change operation point quickly and correctly. Dynamic detail identifications rely heavily on high precision measuring and characterizing basic cavity parameters (Ql, R/Q, dynamic detuning, phase and amplitude) and system behaviours under beam-RF-cavity interactions. It is especially challenging to characterize these dynamics under varying operating points or environment. Advanced technologies in LLRF and ICS providing real time/online characterizing will be the key enablers for addressing such challenges. However, to be successful, the deployment of these technologies must be embedded within local conditions taking into account available resources, existing hardware/software structures and operation modes. Several improvement approaches will be introduced. For example, 15% or more energy efficiency improvement at ESS will be obtained by reduction of power overhead and optimization of operation.
	Slides THAM4X01 [2.165 MB]
Export •	reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOPR018

XAL Applications Development for CSNS Transport Lines

database, linac, interface, emittance

98

Y. Li, Z.P. Li, W.B. Liu
IHEP, Beijing, People's Republic of China
J. Peng
CSNS, Guangdong Province, People's Republic of China

XAL is an application programming framework initially developed at the Spallation Neutron Source (SNS). It has been employed as a part of control system via con-nection to EPICS to provide application programs for beam commissioning at the China Spallation Neutron Source (CSNS). Several XAL-based applications have been developed for Beam Transport line at CSNS and successfully applied in the MEBT and DTL-1 beam commissioning. These applications will be discussed in this paper.

Export •

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

MOPL025

Transient Beam Loading Based Calibration for Cavity Phase and Amplitude Setting

cavity, beam-loading, linac, resonance

250

R. Zeng
ESS, Lund, Sweden
O. Troeng
Lund University, Lund, Sweden

Traditional phase scan method for cavity phase and amplitude setting is offline and hard to track the variations of environment and operation points. An alternative beam loading based calibration method is investigated in this paper, which might become useful online/real time calibration method.

Export •

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

TUPM5X01

Injection Painting Improvements in the J-PARC RCS

injection, power-supply, target, feedback

299

S. Kato, K. Horino, H. Hotchi, M. Kinsho, K. Okabe, P.K. Saha, Y. Shobuda, T. Takayanagi, T. Tobita, T. Ueno
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
H. Harada
JAEA, Ibaraki-ken, Japan

In the J-PARC 3GeV RCS, the injection painting is essential method for the reduction of the space charge force. In this method, the H⁻ beam from Linac is arranged on the large phase space area of the ring orbit during multiple turns. To implement this method, painting magnets form the time variable beam orbit. Therefore, the precise output current control of the magnet power supply is required. Because the power supply controlled by mainly feedforward signal is operated, we developed the iterative tuning method for the optimum feedforward parameter determination. As a result, we could reduce the tracking error of the current compared to before. Furthermore, to improve the accuracy of the painting area size, we applied the output readjustment additionally. Because the current monitor value of the power supply was different from the actual magnetic field due to the delay in the circuit and the leakage field, we corrected the tracking of the current based on the measured painting area size determined by the analysis of the measured COD. As a result, we achieved the precise injection painting. This talk presents these improvement results of the injection painting in the RCS.

Slides TUPM5X01 [4.122 MB]

Export •

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

WEAM2Y01

Overview of the CSNS Linac LLRF and Operational Experiences During Beam Commissioning

LLRF, cavity, linac, FPGA

409

Z.C. Mu
IHEP, Beijing, People's Republic of China
J. Li, M.F. Liu, L.Y. Rong, M.L. Wan, B. Wang, Z.X. Xie, X.A. Xu, Y. Yao, Z. Zhang, W. Zhou
CSNS, Guangdong Province, People's Republic of China

The CSNS Linac is comprised of RFQ, two Buncher cavities, four DTL accelerators and one Debuncher cavity. The RFQ accelerator is powered by two 4616 vacuum tubes, the maximum output power of each tube is 350kW. Three 25kW solid state amplifiers supply RF power for two Buncher cavities and the Debuncher cavity, repectively. The RF power sources of four DTL accelerators are four 3MW klystrons. Each RF power source owns a set of digital LLRF control system in order to realize an accelerating field stability of ±1% in amplitude and ±1° in phase. The front four LLRF control systems have been used in the beam commissioning of CSNS Linac from the end of 2015. This paper will introduce the design and the performance of the LLRF control system.

Slides WEAM2Y01 [6.097 MB]

Export •

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

WEAM7Y01

The Beam Delivery System of the European Spallation Source

target, multipole, proton, simulation

427

H.D. Thomsen
Aarhus University, Aarhus, Denmark
S.P. Møller
ISA, Aarhus, Denmark

The European Spallation Source (ESS) will apply a fast beam scanning system to redistribute the proton beam transversely across the spallation target surface. The system operates at sweep frequencies of tens of kHz and efficiently evens out the time-averaged beam intensity within a nominal beam footprint, thus reducing the level of beam-induced material damage. A modular design approach divides the raster action in each direction across 4 independent magnet-supply systems to distribute the magnetic load, ease the peak output power per modulator, and in general reduce the impact of single points of failure. The state of the magnet design and power supply topology will be discussed.

Slides WEAM7Y01 [6.037 MB]

Export •

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

WEPM4Y01

HPSim - Advanced Online Modeling for Proton Linacs

linac, simulation, DTL, GPU

444

L. Rybarcyk
LANL, Los Alamos, New Mexico, USA

High-power proton linacs seek to operate with low and stable losses. This aspect is carefully evaluated with multi-particle beam dynamics codes during the design stage. However, it is just as important to evaluate the performance of the actual operating linac, which is typically more tedious and complicated when using these same design codes. To improve this situation, we have developed a high-performance, multi-particle online modeling tool, HPSim, with the goal of providing near real-time simulation results for our 800-MeV proton linac at Los Alamos. This presentation will cover the motivation, code features, benefits and applications.

Slides WEPM4Y01 [7.537 MB]

Export •

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

THAM4X01

Investigation to Improve Efficiency and Availability in Control and Operation of Superconducting Cavity at ESS

cavity, operation, klystron, LLRF

474

R. Zeng
ESS, Lund, Sweden
O. Troeng
Lund University, Lund, Sweden

The higher efficiency and higher availability (fault-tolerant oriented) of RF&Cavity system (with beam loading) to operate at, the more dynamic details needs to be identified, so as to have the abilities (a) to work at nonlinearities, (b) to work close to limitation, and (c) to change operation point quickly and correctly. Dynamic detail identifications rely heavily on high precision measuring and characterizing basic cavity parameters (Ql, R/Q, dynamic detuning, phase and amplitude) and system behaviours under beam-RF-cavity interactions. It is especially challenging to characterize these dynamics under varying operating points or environment. Advanced technologies in LLRF and ICS providing real time/online characterizing will be the key enablers for addressing such challenges. However, to be successful, the deployment of these technologies must be embedded within local conditions taking into account available resources, existing hardware/software structures and operation modes. Several improvement approaches will be introduced. For example, 15% or more energy efficiency improvement at ESS will be obtained by reduction of power overhead and optimization of operation.

Slides THAM4X01 [2.165 MB]

Export •

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