HB2014 - List of Authors (He, Z.Q.)

Paper	Title	Page
MOPAB35	Beam Dynamics Influence from Quadrupole Components in FRIB Quarter Wave Resonators	108
	Z.Q. He, Z. Liu, J. Wei, Y. Zhang, Z. Zheng FRIB, East Lansing, Michigan, USA
	Funding: The work is supported by the U.S. National Science Foundation under Grant No. PHY-11-02511, and the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661. Non-axisymmetric RF cavities, such as quarter-wave resonators (QWRs), can produce axially asymmetric multipole field components that can influence beam dynamics. For example, dipole components can cause beam steering, an effect that has been well known to the community since 2001. However, higher order multipole field components, such as quadrupole components, which have potential influence on beam dynamics, have never received enough attention yet. In this paper, we choose FRIB QWRs as an example and quadrupole components are extracted by multipole expansion. Then, influence of quadrupole components on a single cavity is studied using thin lens model. After that, the influence of quadrupole components on a whole FRIB linac segment one is studied, and effects such as transverse profile ovalization and blow up of beam size are witnessed. Lastly, a possible way of quadrupole components compensation for FRIB driving linac is discussed.

TUO4AB03	Beam Dynamics Studies for the Facility for Rare Isotope Beams Driver Linac	231
	M. Ikegami, Z.Q. He, S.M. Lidia, Z. Liu, S.M. Lund, F. Marti, G. Pozdeyev, J. Wei, Y. Yamazaki, Y. Zhang, Q. Zhao FRIB, East Lansing, Michigan, USA
	Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 and the National Science Foundation under Grant No. PHY-1102511. Facility for Rare Isotope Beams (FRIB) is a high-power heavy ion accelerator facility presently under construction at Michigan State University located in Michigan. FRIB consists of a CW driver linac, experimental facility, the linac accelerates ions up to uranium with the energy of 200 MeV/u and with the beam power of 400 kW. As the assumed beam power is more than two order of magnitude higher than the existing heavy ion linac facilities, various beam dynamics challenges are assumed for the driver linac. In this paper, beam dynamic challenges for FRIB driver linac and undergoing studies to address them are reviewed, which would include those related to machine protection and collimation of halos after a stripper.

Paper

Title

Page

Beam Dynamics Influence from Quadrupole Components in FRIB Quarter Wave Resonators

108

Z.Q. He, Z. Liu, J. Wei, Y. Zhang, Z. Zheng
FRIB, East Lansing, Michigan, USA

Funding: The work is supported by the U.S. National Science Foundation under Grant No. PHY-11-02511, and the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661.
Non-axisymmetric RF cavities, such as quarter-wave resonators (QWRs), can produce axially asymmetric multipole field components that can influence beam dynamics. For example, dipole components can cause beam steering, an effect that has been well known to the community since 2001. However, higher order multipole field components, such as quadrupole components, which have potential influence on beam dynamics, have never received enough attention yet. In this paper, we choose FRIB QWRs as an example and quadrupole components are extracted by multipole expansion. Then, influence of quadrupole components on a single cavity is studied using thin lens model. After that, the influence of quadrupole components on a whole FRIB linac segment one is studied, and effects such as transverse profile ovalization and blow up of beam size are witnessed. Lastly, a possible way of quadrupole components compensation for FRIB driving linac is discussed.

TUO4AB03

Beam Dynamics Studies for the Facility for Rare Isotope Beams Driver Linac

231

M. Ikegami, Z.Q. He, S.M. Lidia, Z. Liu, S.M. Lund, F. Marti, G. Pozdeyev, J. Wei, Y. Yamazaki, Y. Zhang, Q. Zhao
FRIB, East Lansing, Michigan, USA

Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 and the National Science Foundation under Grant No. PHY-1102511.
Facility for Rare Isotope Beams (FRIB) is a high-power heavy ion accelerator facility presently under construction at Michigan State University located in Michigan. FRIB consists of a CW driver linac, experimental facility, the linac accelerates ions up to uranium with the energy of 200 MeV/u and with the beam power of 400 kW. As the assumed beam power is more than two order of magnitude higher than the existing heavy ion linac facilities, various beam dynamics challenges are assumed for the driver linac. In this paper, beam dynamic challenges for FRIB driver linac and undergoing studies to address them are reviewed, which would include those related to machine protection and collimation of halos after a stripper.