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Title: Studies on low energy beam transport for high intensity high charged ions at IMP

Abstract

Superconducting Electron Cyclotron Resonance ion source with Advanced design in Lanzhou (SECRAL) is an advanced fully superconducting ECR ion source at IMP designed to be operational at the microwave frequency of 18–24 GHz. The existing SECRAL beam transmission line is composed of a solenoid lens and a 110° analyzing magnet. Simulations of particle tracking with 3D space charge effect and realistic 3D magnetic fields through the line were performed using particle-in-cell code. The results of the beam dynamics show that such a low energy beam is very sensitive to the space charge effect and significantly suffers from the second-order aberration of the analyzing magnet resulting in large emittance. However, the second-order aberration could be reduced by adding compensating sextupole components in the beam line. On this basis, a new 110° analyzing magnet with relatively larger acceptance and smaller aberration is designed and will be used in the design of low energy beam transport line for a new superconducting ECR ion source SECRAL-II. The features of the analyzer and the corresponding beam trajectory calculation will be detailed and discussed in this paper.

Authors:
; ;  [1];  [2]; ; ; ; ; ; ;  [1]
  1. Institute of Modern Physics, CAS, Lanzhou 730000 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22253974
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 2; Conference: ICIS 2011: 14. international conference on ion sources, Giardini-Naxos, Sicily (Italy), 12-16 Sep 2011; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BEAM TRANSPORT; ECR ION SOURCES; GHZ RANGE 01-100; ION BEAMS; LENSES; MAGNETIC FIELDS; MAGNETS; MICROWAVE RADIATION; SOLENOIDS; SPACE CHARGE

Citation Formats

Yang, Y., E-mail: yangyao@impcas.ac.cn, Lu, W., Fang, X., University of Chinese Academy of Sciences, Beijing 100039, Sun, L. T., Hu, Q., Cao, Y., Feng, Y. C., Zhang, X. Z., Zhao, H. W., and Xie, D. Z.. Studies on low energy beam transport for high intensity high charged ions at IMP. United States: N. p., 2014. Web. doi:10.1063/1.4832935.
Yang, Y., E-mail: yangyao@impcas.ac.cn, Lu, W., Fang, X., University of Chinese Academy of Sciences, Beijing 100039, Sun, L. T., Hu, Q., Cao, Y., Feng, Y. C., Zhang, X. Z., Zhao, H. W., & Xie, D. Z.. Studies on low energy beam transport for high intensity high charged ions at IMP. United States. doi:10.1063/1.4832935.
Yang, Y., E-mail: yangyao@impcas.ac.cn, Lu, W., Fang, X., University of Chinese Academy of Sciences, Beijing 100039, Sun, L. T., Hu, Q., Cao, Y., Feng, Y. C., Zhang, X. Z., Zhao, H. W., and Xie, D. Z.. Sat . "Studies on low energy beam transport for high intensity high charged ions at IMP". United States. doi:10.1063/1.4832935.
@article{osti_22253974,
title = {Studies on low energy beam transport for high intensity high charged ions at IMP},
author = {Yang, Y., E-mail: yangyao@impcas.ac.cn and Lu, W. and Fang, X. and University of Chinese Academy of Sciences, Beijing 100039 and Sun, L. T. and Hu, Q. and Cao, Y. and Feng, Y. C. and Zhang, X. Z. and Zhao, H. W. and Xie, D. Z.},
abstractNote = {Superconducting Electron Cyclotron Resonance ion source with Advanced design in Lanzhou (SECRAL) is an advanced fully superconducting ECR ion source at IMP designed to be operational at the microwave frequency of 18–24 GHz. The existing SECRAL beam transmission line is composed of a solenoid lens and a 110° analyzing magnet. Simulations of particle tracking with 3D space charge effect and realistic 3D magnetic fields through the line were performed using particle-in-cell code. The results of the beam dynamics show that such a low energy beam is very sensitive to the space charge effect and significantly suffers from the second-order aberration of the analyzing magnet resulting in large emittance. However, the second-order aberration could be reduced by adding compensating sextupole components in the beam line. On this basis, a new 110° analyzing magnet with relatively larger acceptance and smaller aberration is designed and will be used in the design of low energy beam transport line for a new superconducting ECR ion source SECRAL-II. The features of the analyzer and the corresponding beam trajectory calculation will be detailed and discussed in this paper.},
doi = {10.1063/1.4832935},
journal = {Review of Scientific Instruments},
number = 2,
volume = 85,
place = {United States},
year = {Sat Feb 15 00:00:00 EST 2014},
month = {Sat Feb 15 00:00:00 EST 2014}
}
  • In order to investigate the limits of scintillating screens for beam profile monitoring in the ultra-low energy, ultra-low intensity regime, CsI:Tl, YAG:Ce, and a Tb glass-based scintillating fiber optic plate (SFOP) were tested. The screens response to 200 and 50 keV proton beams with intensities ranging from a few picoampere down to the subfemtoampere region was examined. In the following paper, the sensitivity and resolution studies are presented in detail for CsI:Tl and the SFOP, the two most sensitive screens. In addition, a possible use of scintillators for ultra-low energy antiproton beam monitoring is discussed.
  • The nonlinear {delta}F formalism based on the Vlasov-Poisson equations is used to describe the propagation of a matched, high-intensity ion beam through a periodic-focusing solenoidal field in the thin-beam approximation (r{sub b}{lt}S). The distribution function F{sub b} is divided into a zero-order part (F{sub b}{sup 0}) plus a perturbation ({delta}F{sub b}) which evolve nonlinearly in the zero-order and perturbed field configurations. To illustrate the application of the technique to axisymmetric, matched-beam propagation, nonlinear {delta}F simulation results are presented for the case of a periodic solenoidal focusing field in which the (oscillatory) coupling coefficient {kappa}{sub z}(s) turns on adiabatically about amore » constant average value {tilde {kappa}}{sub z}. For a field oscillation which turns on gradually over about twenty lattice periods, the amplitude of the mismatch oscillation is reduced by about one order-of-magnitude compared to the case where the field is turned on suddenly. {copyright} {ital 1998 American Institute of Physics.}« less
  • The nonlinear {delta}F formalism based on the Vlasov-Poisson equations is used to describe the propagation of a matched, high-intensity ion beam through a periodic-focusing solenoidal field in the thin-beam approximation (r{sub b}<<S). The distribution function F{sub b} is divided into a zero-order part (F{sub b}{sup 0}) plus a perturbation ({delta}F{sub b}) which evolve nonlinearly in the zero-order and perturbed field configurations. To illustrate the application of the technique to axisymmetric, matched-beam propagation, nonlinear {delta}F simulation results are presented for the case of a periodic solenoidal focusing field in which the (oscillatory) coupling coefficient {kappa}{sub z}(s) turns on adiabatically about amore » constant average value {kappa}-tilde{sub z}. For a field oscillation which turns on gradually over about twenty lattice periods, the amplitude of the mismatch oscillation is reduced by about one order-of-magnitude compared to the case where the field is turned on suddenly.« less
  • The Kansas State University cryogenic electron beam ion source supplies low energy ion beams to users of the Department of Energy user facility for highly charged ions. The ions escape the source with an initial energy between 1.6 and 5 kV per charge and are analyzed in a 90 degree sign dipole magnet located on the high voltage platform. When leaving the platform the ions can be accelerated by up to 160 kV per charge or can be decelerated to about 20% of their initial energy, covering 2.5 orders of magnitude. We are in the process of adding another ordermore » of magnitude to the range of available ion energies as a newly installed lens allows for deceleration down to a very few percent of the initial energy. In addition we present the current microbunching and chopping system which has been substantially improved over the past 2 yr. (c) 2000 American Institute of Physics.« less