HB2016 - Table of Session: THB6 (Working Group B

Paper	Title	Page
THPM5Y01	Design and Beam Dynamics Studies of a Multi-Ion Linac Injector for the JLEIC Ion Complex	559
	P.N. Ostroumov, Z.A. Conway, B. Mustapha, A.S. Plastun ANL, Argonne, USA
	Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract number DE-AC02-06CH11357. The electron-ion collider being developed at JLAB requires a new ion accelerator complex which includes a linac capable of delivering any ion beam from hydrogen to lead to the booster. We are currently developing a linac which consists of several ion sources, a normal conducting (NC) front end, up to 5 MeV/u, and a SC section for energies > 5 MeV/u. The development work is focused on beam dynamics and electrodynamics studies to design efficient and cost-effective accelerating structures for both the NC and SC sections of the linac. Currently we are considering two RFQs following either heavy-ion sources or light-ion sources including polarized beams, and several different types of NC accelerating structures downstream of the RFQ. Quarter-wave and half-wave resonators can be effectively used in the SC section.
	Slides THPM5Y01 [2.108 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-HB2016-THPM5Y01
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THPM6Y01	Collective Beam Instability and Beam Halo Due to Space Charge
	C. Li, Zh.C. Liu, Q. Qin IHEP, Beijing, People's Republic of China R.A. Jameson IAP, Frankfurt am Main, Germany
	The collective mode instability in high intensity ion beam induced by space charge has been studied for several decades. Beam halo also will be formed if beam is located in the collective mode unstable stop band. In this paper, firstly we clearly show that the beam surface is distorted by the space charge potential perturbation; the formed n-fold structure is in particular to the nth order unstable collective mode. Secondly, the formed n-fold structure will lead to beam halo with beam evolution. The halo mechanism could be depicted by resonance between single particle and oscillation collective mode. Finally, we proved that the halo particles are those whose actions were modified significantly by the nonlinear space charge and resonance.
	Slides THPM6Y01 [1.318 MB]
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THPM7Y01	A New RFQ Model and Symplectic Multi-Particle Tracking in the IMPACT Code Suite	562
	J. Qiang LBNL, Berkeley, California, USA L. Li, Z. Wang PKU, Beijing, People's Republic of China
	The IMPACT code suite is a self-consistent parallel three-dimensional beam dynamics simulation toolbox that combines the magnetic optics method and the parallel particle-in-cell method. It has been widely used to study high intensity/high brightness beams in many accelerators. In this paper, we will report on recent improvements to the code such as the capability to model RFQ in time domain and symplectic multi-particle tracking with a gridless spectral solver for space-charge simulation.
	Slides THPM7Y01 [8.794 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-HB2016-THPM7Y01
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THPM8Y01	Beam Energy Loss in a β=0.09 SRF HWR Cavity for 100 mA Proton Acceleration	567
	F. Zhu, K.X. Liu, S.W. Quan, F. Wang, H.T.X. Zhong PKU, Beijing, People's Republic of China
	Funding: Work supported by National Basic Research Project (No.2014CB845504) There’s presently a growing demand for cw high current proton and deuteron linear accelerators based on superconducting technology to better support various fields of science. Up to now, high order modes (HOMs) studies induced by ion beams with current higher than 10mA and even 100 mA accelerated by low β non-elliptical Superconducting rf (SRF) cavities are very few. One of the main HOM related issues of the SRF linac is the HOM-induced power. HOM power is the important part of beam energy loss which is used to estimate the cryogenic losses. In this paper, we compare the beam energy loss induced by 100 mA beam passing through a β=0.09 HWR SRF cavity calculated from time domain solver and frequency domain cavity eigenmodes spectrum method.
	Slides THPM8Y01 [0.611 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-HB2016-THPM8Y01
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THPM9Y01	An Advanced Procedure for Longitudinal Beam Matching for SC CW Heavy Ion Linac With Variable Output Energy	571
	S. Yaramyshev, W.A. Barth, V. Gettmann, M. Heilmann, S. Mickat, M. Miski-Oglu GSI, Darmstadt, Germany K. Aulenbacher, W.A. Barth, V. Gettmann, S. Mickat, M. Miski-Oglu HIM, Mainz, Germany K. Aulenbacher IKP, Mainz, Germany W.A. Barth, S. Yaramyshev MEPhI, Moscow, Russia M. Heilmann IAP, Frankfurt am Main, Germany
	A multi-stage programm for the developmnet of a heavy ion superconducting (SC) continuous wave (CW) linac is in progress at HIM (Mainz, Germany), GSI (Darmstadt, Germany) and IAP (Frankfurt, Germany). The main beam acceleration is provided by up to nine multi-gap CH cavities. Due to variable beam energy, which coud be provided by each cavity separate, a longitudinal beam matching to each cavity is extremely important. The linac should provide the beam for physics experiments, smothly varying the output particle energy from 3.5 to 7.3 MeV/u, simultaneously keeping high beam quality. A dedicated algorythm for such a complicate matching, providing for the optimum machine settings (voltage and rf phase for each cavity), has been developed. The description of method and the obtained reasuts are discussed in this paper.
	Slides THPM9Y01 [1.585 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-HB2016-THPM9Y01
Export •	reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Design and Beam Dynamics Studies of a Multi-Ion Linac Injector for the JLEIC Ion Complex

559

P.N. Ostroumov, Z.A. Conway, B. Mustapha, A.S. Plastun
ANL, Argonne, USA

Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract number DE-AC02-06CH11357.
The electron-ion collider being developed at JLAB requires a new ion accelerator complex which includes a linac capable of delivering any ion beam from hydrogen to lead to the booster. We are currently developing a linac which consists of several ion sources, a normal conducting (NC) front end, up to 5 MeV/u, and a SC section for energies > 5 MeV/u. The development work is focused on beam dynamics and electrodynamics studies to design efficient and cost-effective accelerating structures for both the NC and SC sections of the linac. Currently we are considering two RFQs following either heavy-ion sources or light-ion sources including polarized beams, and several different types of NC accelerating structures downstream of the RFQ. Quarter-wave and half-wave resonators can be effectively used in the SC section.

Slides THPM5Y01 [2.108 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-HB2016-THPM5Y01

Export •

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

THPM6Y01

Collective Beam Instability and Beam Halo Due to Space Charge

C. Li, Zh.C. Liu, Q. Qin
IHEP, Beijing, People's Republic of China
R.A. Jameson
IAP, Frankfurt am Main, Germany

The collective mode instability in high intensity ion beam induced by space charge has been studied for several decades. Beam halo also will be formed if beam is located in the collective mode unstable stop band. In this paper, firstly we clearly show that the beam surface is distorted by the space charge potential perturbation; the formed n-fold structure is in particular to the nth order unstable collective mode. Secondly, the formed n-fold structure will lead to beam halo with beam evolution. The halo mechanism could be depicted by resonance between single particle and oscillation collective mode. Finally, we proved that the halo particles are those whose actions were modified significantly by the nonlinear space charge and resonance.

Slides THPM6Y01 [1.318 MB]

Export •

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

THPM7Y01

A New RFQ Model and Symplectic Multi-Particle Tracking in the IMPACT Code Suite

562

J. Qiang
LBNL, Berkeley, California, USA
L. Li, Z. Wang
PKU, Beijing, People's Republic of China

The IMPACT code suite is a self-consistent parallel three-dimensional beam dynamics simulation toolbox that combines the magnetic optics method and the parallel particle-in-cell method. It has been widely used to study high intensity/high brightness beams in many accelerators. In this paper, we will report on recent improvements to the code such as the capability to model RFQ in time domain and symplectic multi-particle tracking with a gridless spectral solver for space-charge simulation.

Slides THPM7Y01 [8.794 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-HB2016-THPM7Y01

Export •

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

THPM8Y01

Beam Energy Loss in a β=0.09 SRF HWR Cavity for 100 mA Proton Acceleration

567

F. Zhu, K.X. Liu, S.W. Quan, F. Wang, H.T.X. Zhong
PKU, Beijing, People's Republic of China

Funding: Work supported by National Basic Research Project (No.2014CB845504)
There’s presently a growing demand for cw high current proton and deuteron linear accelerators based on superconducting technology to better support various fields of science. Up to now, high order modes (HOMs) studies induced by ion beams with current higher than 10mA and even 100 mA accelerated by low β non-elliptical Superconducting rf (SRF) cavities are very few. One of the main HOM related issues of the SRF linac is the HOM-induced power. HOM power is the important part of beam energy loss which is used to estimate the cryogenic losses. In this paper, we compare the beam energy loss induced by 100 mA beam passing through a β=0.09 HWR SRF cavity calculated from time domain solver and frequency domain cavity eigenmodes spectrum method.

Slides THPM8Y01 [0.611 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-HB2016-THPM8Y01

Export •

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

THPM9Y01

An Advanced Procedure for Longitudinal Beam Matching for SC CW Heavy Ion Linac With Variable Output Energy

571

S. Yaramyshev, W.A. Barth, V. Gettmann, M. Heilmann, S. Mickat, M. Miski-Oglu
GSI, Darmstadt, Germany
K. Aulenbacher, W.A. Barth, V. Gettmann, S. Mickat, M. Miski-Oglu
HIM, Mainz, Germany
K. Aulenbacher
IKP, Mainz, Germany
W.A. Barth, S. Yaramyshev
MEPhI, Moscow, Russia
M. Heilmann
IAP, Frankfurt am Main, Germany

A multi-stage programm for the developmnet of a heavy ion superconducting (SC) continuous wave (CW) linac is in progress at HIM (Mainz, Germany), GSI (Darmstadt, Germany) and IAP (Frankfurt, Germany). The main beam acceleration is provided by up to nine multi-gap CH cavities. Due to variable beam energy, which coud be provided by each cavity separate, a longitudinal beam matching to each cavity is extremely important. The linac should provide the beam for physics experiments, smothly varying the output particle energy from 3.5 to 7.3 MeV/u, simultaneously keeping high beam quality. A dedicated algorythm for such a complicate matching, providing for the optimum machine settings (voltage and rf phase for each cavity), has been developed. The description of method and the obtained reasuts are discussed in this paper.

Slides THPM9Y01 [1.585 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-HB2016-THPM9Y01

Export •

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