HB2016 - List of Keywords (extraction)

Paper	Title	Other Keywords	Page
MOPR005	RF-Knockout Slow Extraction Design for XiPAF Synchrotron	septum, synchrotron, resonance, simulation	52
	H.J. Yao, X. Guan, G.R. Li, X.W. Wang, Q. Zhang, S.X. Zheng TUB, Beijing, People's Republic of China
	The physics design of slow extraction for Xi’an Proton Application Facility (XiPAF) synchrotron is discussed. The extraction scheme is composed of two resonant sextupoles, one electrostatic septum (ES) and two septum magnets. The phase space diagram under the Hardt condition at the entrance of ES and the last three turn’s trajectory before extraction are presented. A program is written with C++ to simulate slow extraction process by RF-knockout (RF-KO), the calculation results of dual frequency modulation (FM) and amplitude modulation (AM) are given, and the standard deviation of the fluctuation parameter R1 can be limited 0.2 with optimum parameters under a sampling frequency of about 10 kHz.
Export •	reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPR006	Design of the 230MeV Proton Accelerator for Xi'an Proton Application Facility	proton, synchrotron, injection, linac	55
	H.J. Yao, H.B. Chen, C. Cheng, C.T. Du, L. Du, T.B. Du, X. Guan, W.-H. Huang, H. Jiang, G.R. Li, C.-X. Tang, R. Tang, D. Wang, W. Wang, X.W. Wang, L. Wu, Q.Z. Xing, Y. Yang, Z. Yang, H.J. Zeng, H.Y. Zhang, Q. Zhang, Q.Z. Zhang, S.X. Zheng TUB, Beijing, People's Republic of China W. Chen NINT, Xi'an, People's Republic of China W.Q. Guan, Y. He, J. Li NUCTECH, Beijing, People's Republic of China S.-Y. Lee Indiana University, Bloomington, Indiana, USA M.T. Qiu, B.C. Wang, Y.P. Wang, Z.M. Wang, Y.H. Yan, H.Z. Zhang, C. Zhao State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Shannxi, People's Republic of China
	We report a design of the 230 MeV proton accelera-tor, the Xi’an Proton Application Facility (XiPAF), which will be located in Xi’an city, China. The facility will provide proton beam with the maximum energy of 230 MeV for the research of the single event effect. The facility, composed of a 230 MeV synchrotron, a 7 MeV H⁻ linac injector and two experimental stations, will provide a flux of 10⁵~10⁸ p/cm²/s with the uni-formity of better than 90% on the 10 cm×10 cm sample.
Export •	reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPR009	Transverse Beam Splitting Made Operational: Recent Progress of the Multi-Turn Extraction at the CERN Proton Synchrotron	simulation, proton, septum, synchrotron	65
	A. Huschauer, J.C.C.M. Borburgh, S. Damjanovic, S.S. Gilardoni, M. Giovannozzi, M. Hourican, K. Kahle, G. Le Godec, O. Michels, G. Sterbini CERN, Geneva, Switzerland C. Hernalsteens IBA, Louvain-la-Neuve, Belgium
	Following a successful commissioning period, the Multi-Turn Extraction (MTE) at the CERN Proton Synchrotron (PS) has been applied for the fixed-target physics programme at the Super Proton Synchrotron (SPS) since September 2015. This exceptional extraction technique was proposed to replace the long-serving Continuous Transfer (CT) extraction, which has the drawback of inducing high activation in the ring. MTE exploits the principles of non-linear beam dynamics to perform loss-free beam splitting in the horizontal phase space. Over multiple turns, the resulting beamlets are then transferred to the downstream accelerator. The operational deployment of MTE was rendered possible by the full understanding and mitigation of different hardware limitations and by redesigning the extraction trajectories and non-linear optics, which was required due to the installation of a dummy septum to reduce the activation of the magnetic extraction septum. The results of the related experimental and simulation studies, a summary of the 2015 performance analysis, as well as more recent performance improvements are presented in this paper.
Export •	reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUAM7X01	Intensity Effects in the Formation of Stable Islands in Phase Space During the Multi-Turn Extraction Process at the CERN PS	space-charge, simulation, vacuum, closed-orbit	283
	S. Machida STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom S.S. Gilardoni, M. Giovannozzi, S. Hirlaender, A. Huschauer CERN, Geneva, Switzerland C.R. Prior STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	The CERN PS utilises a multi-turn extraction (MTE) scheme to stretch the beam pulse length to optimise the filling process of the SPS. MTE is a novel technique to split a beam in transverse phase space into nonlinear stable islands. The recent experimental results indicate that the positions of the islands depend on the total beam intensity. Particle simulations have been performed to understand the detailed mechanism of the intensity dependence. The analysis carried out so far suggests space charge effects through image charges and image currents on the vacuum chamber and the magnets’ iron cores dominate the observed behaviour. In this talk, the latest analysis with realistic modelling of the beam environment is discussed and it is shown how this further improves the understanding of intensity effects in MTE.
	Slides TUAM7X01 [1.682 MB]
Export •	reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPM1X01	Broadband Feedback System for Instability Damping in the SNS Ring	operation, feedback, betatron, accumulation	288
	N.J. Evans ORNL RAD, Oak Ridge, Tennessee, USA
	Funding: SNS is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy The transverse feedback system in the Accumulator Ring of the Spallation Neutron Source~(SNS) is intended to damp broadband (≈40-120~MHz), coherent betatron motion due to e-p interaction. The SNS feedback system is based on an analog delay-line model with some signal conditioning and tuning parameters implemented digitally. This system provides a simple setup with two primary knobs, phase and gain, as well as an equalizer. This simplicity comes at the cost of some flexibility normally found in a standard mode-by-mode design, namely mode-by-mode phase, and gain control. In this paper we discuss the design, tuning, evaluation, and operation of the SNS feedback damper, and discuss the tradeoffs implicit in the design of the system.
	Slides TUPM1X01 [2.352 MB]
Export •	reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOPR005

RF-Knockout Slow Extraction Design for XiPAF Synchrotron

septum, synchrotron, resonance, simulation

52

H.J. Yao, X. Guan, G.R. Li, X.W. Wang, Q. Zhang, S.X. Zheng
TUB, Beijing, People's Republic of China

The physics design of slow extraction for Xi’an Proton Application Facility (XiPAF) synchrotron is discussed. The extraction scheme is composed of two resonant sextupoles, one electrostatic septum (ES) and two septum magnets. The phase space diagram under the Hardt condition at the entrance of ES and the last three turn’s trajectory before extraction are presented. A program is written with C++ to simulate slow extraction process by RF-knockout (RF-KO), the calculation results of dual frequency modulation (FM) and amplitude modulation (AM) are given, and the standard deviation of the fluctuation parameter R1 can be limited 0.2 with optimum parameters under a sampling frequency of about 10 kHz.

Export •

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

MOPR006

Design of the 230MeV Proton Accelerator for Xi'an Proton Application Facility

proton, synchrotron, injection, linac

55

H.J. Yao, H.B. Chen, C. Cheng, C.T. Du, L. Du, T.B. Du, X. Guan, W.-H. Huang, H. Jiang, G.R. Li, C.-X. Tang, R. Tang, D. Wang, W. Wang, X.W. Wang, L. Wu, Q.Z. Xing, Y. Yang, Z. Yang, H.J. Zeng, H.Y. Zhang, Q. Zhang, Q.Z. Zhang, S.X. Zheng
TUB, Beijing, People's Republic of China
W. Chen
NINT, Xi'an, People's Republic of China
W.Q. Guan, Y. He, J. Li
NUCTECH, Beijing, People's Republic of China
S.-Y. Lee
Indiana University, Bloomington, Indiana, USA
M.T. Qiu, B.C. Wang, Y.P. Wang, Z.M. Wang, Y.H. Yan, H.Z. Zhang, C. Zhao
State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Shannxi, People's Republic of China

We report a design of the 230 MeV proton accelera-tor, the Xi’an Proton Application Facility (XiPAF), which will be located in Xi’an city, China. The facility will provide proton beam with the maximum energy of 230 MeV for the research of the single event effect. The facility, composed of a 230 MeV synchrotron, a 7 MeV H⁻ linac injector and two experimental stations, will provide a flux of 10⁵~10⁸ p/cm²/s with the uni-formity of better than 90% on the 10 cm×10 cm sample.

Export •

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

MOPR009

Transverse Beam Splitting Made Operational: Recent Progress of the Multi-Turn Extraction at the CERN Proton Synchrotron

simulation, proton, septum, synchrotron

65

A. Huschauer, J.C.C.M. Borburgh, S. Damjanovic, S.S. Gilardoni, M. Giovannozzi, M. Hourican, K. Kahle, G. Le Godec, O. Michels, G. Sterbini
CERN, Geneva, Switzerland
C. Hernalsteens
IBA, Louvain-la-Neuve, Belgium

Following a successful commissioning period, the Multi-Turn Extraction (MTE) at the CERN Proton Synchrotron (PS) has been applied for the fixed-target physics programme at the Super Proton Synchrotron (SPS) since September 2015. This exceptional extraction technique was proposed to replace the long-serving Continuous Transfer (CT) extraction, which has the drawback of inducing high activation in the ring. MTE exploits the principles of non-linear beam dynamics to perform loss-free beam splitting in the horizontal phase space. Over multiple turns, the resulting beamlets are then transferred to the downstream accelerator. The operational deployment of MTE was rendered possible by the full understanding and mitigation of different hardware limitations and by redesigning the extraction trajectories and non-linear optics, which was required due to the installation of a dummy septum to reduce the activation of the magnetic extraction septum. The results of the related experimental and simulation studies, a summary of the 2015 performance analysis, as well as more recent performance improvements are presented in this paper.

Export •

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

TUAM7X01

Intensity Effects in the Formation of Stable Islands in Phase Space During the Multi-Turn Extraction Process at the CERN PS

space-charge, simulation, vacuum, closed-orbit

283

S. Machida
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
S.S. Gilardoni, M. Giovannozzi, S. Hirlaender, A. Huschauer
CERN, Geneva, Switzerland
C.R. Prior
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

The CERN PS utilises a multi-turn extraction (MTE) scheme to stretch the beam pulse length to optimise the filling process of the SPS. MTE is a novel technique to split a beam in transverse phase space into nonlinear stable islands. The recent experimental results indicate that the positions of the islands depend on the total beam intensity. Particle simulations have been performed to understand the detailed mechanism of the intensity dependence. The analysis carried out so far suggests space charge effects through image charges and image currents on the vacuum chamber and the magnets’ iron cores dominate the observed behaviour. In this talk, the latest analysis with realistic modelling of the beam environment is discussed and it is shown how this further improves the understanding of intensity effects in MTE.

Slides TUAM7X01 [1.682 MB]

Export •

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

TUPM1X01

Broadband Feedback System for Instability Damping in the SNS Ring

operation, feedback, betatron, accumulation

288

N.J. Evans
ORNL RAD, Oak Ridge, Tennessee, USA

Funding: SNS is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy
The transverse feedback system in the Accumulator Ring of the Spallation Neutron Source~(SNS) is intended to damp broadband (≈40-120~MHz), coherent betatron motion due to e-p interaction. The SNS feedback system is based on an analog delay-line model with some signal conditioning and tuning parameters implemented digitally. This system provides a simple setup with two primary knobs, phase and gain, as well as an equalizer. This simplicity comes at the cost of some flexibility normally found in a standard mode-by-mode design, namely mode-by-mode phase, and gain control. In this paper we discuss the design, tuning, evaluation, and operation of the SNS feedback damper, and discuss the tradeoffs implicit in the design of the system.

Slides TUPM1X01 [2.352 MB]

Export •

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