HB2014 - List of Authors (Lund, S.M.)

Paper

Title

Page

RMS Emittance Measures for Solenoid Transport and Facitlity for Rare Isotope Beams Front-End Simulations

57

S.M. Lund, G. Pozdeyev, H.T. Ren, 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.
Measurement of beam phase-space area via rms emittances in solenoid focusing channels with linear x-y coupling is complicated relative to transport channels with decoupled plane focusing. This stems from correlated azimuthal flow of the beam induced by the coupled focusing influencing how the thermal component of the flow should be measured. This is exacerbated when the beam has finite canonical angular momentum – as is the case for beams born in a magnetic field in ECR-type sources. In this study, simple measures of rms emittance for use in solenoid transport for beams with canonical angular momentum are motivated and overviewed. Emphasis is placed on simple to interpret emittance measures which reduce to familiar forms for decoupled plane motion. These emittances are applied in Warp PIC simulations of the near-source region of the FRIB linac front-end. In these simulations, a multi-species heavy-ion dc beam emerging from an ECR source are simulated primarily in transverse slice mode using a realistic lattice description. Emittance growth due to nonlinear applied fields, space-charge, and partial neutralization is analyzed including the influence of net canonical angular momentum.

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.

FRO1AU03

Working Group C Summary: Computational Challenges, New Concepts, and New Projects

448

S.M. Lund
FRIB, East Lansing, Michigan, USA
G. Franchetti
GSI, Darmstadt, Germany
H. Okamoto
HU/AdSM, Higashi-Hiroshima, Japan

Summary of Working Group C

Slides FRO1AU03 [3.773 MB]

Paper	Title	Page
MOPAB17	RMS Emittance Measures for Solenoid Transport and Facitlity for Rare Isotope Beams Front-End Simulations	57
	S.M. Lund, G. Pozdeyev, H.T. Ren, 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. Measurement of beam phase-space area via rms emittances in solenoid focusing channels with linear x-y coupling is complicated relative to transport channels with decoupled plane focusing. This stems from correlated azimuthal flow of the beam induced by the coupled focusing influencing how the thermal component of the flow should be measured. This is exacerbated when the beam has finite canonical angular momentum – as is the case for beams born in a magnetic field in ECR-type sources. In this study, simple measures of rms emittance for use in solenoid transport for beams with canonical angular momentum are motivated and overviewed. Emphasis is placed on simple to interpret emittance measures which reduce to familiar forms for decoupled plane motion. These emittances are applied in Warp PIC simulations of the near-source region of the FRIB linac front-end. In these simulations, a multi-species heavy-ion dc beam emerging from an ECR source are simulated primarily in transverse slice mode using a realistic lattice description. Emittance growth due to nonlinear applied fields, space-charge, and partial neutralization is analyzed including the influence of net canonical angular momentum.

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.

FRO1AU03	Working Group C Summary: Computational Challenges, New Concepts, and New Projects	448
	S.M. Lund FRIB, East Lansing, Michigan, USA G. Franchetti GSI, Darmstadt, Germany H. Okamoto HU/AdSM, Higashi-Hiroshima, Japan
	Summary of Working Group C
	Slides FRO1AU03 [3.773 MB]