HB2016 - List of Authors (Blaskiewicz, M.)

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TUAM1X01

A Two Particle Model for Study of Effects of Space-Charge Force on Strong Head-Tail Instabilities.

Y.H. Chin
KEK, Ibaraki, Japan
M. Blaskiewicz
BNL, Upton, Long Island, New York, USA
A. Chao
SLAC, Menlo Park, California, USA
Y. Shobuda
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan

In this talk, I present a new two particle model for study of strong head-tail instabilities in the presence of the space-charge force. It is a simple expansion of the well-known two particle model. No chromaticity effect is included. It leads to a formula for the growth rate as a function of the two dimensionless parameters: the space-charge tune shift parameter (normalized by the synchrotron tune) and the wake field strength, Υ. The 3-dimensional contour plot of the growth rate as a function of those two dimensionless parameters reveals stopband structures. Many simulation results generally indicate that a strong head-tail instability can be damped by a weak space-charge force, but the beam becomes unstable again when the space-charge force is further increased. The new two particle model indicates a similar behavior. In weak space-charge regions, additional tune shifts by the space-charge force dissolve the mode-coupling. As the space-charge force is increased, they conversely restore the mode-coupling, but then a further increase of the space-charge force decouples the modes again. This mode coupling/decoupling behavior creates the stopbands structures.

Slides TUAM1X01 [9.082 MB]

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THAM7X01

RHIC Operation and e-lens Commissioning

X. Gu, J.G. Alessi, Z. Altinbas, E.N. Beebe, M. Blaskiewicz, J.M. Brennan, D. Bruno, M.R. Costanzo, W. Fischer, C.J. Gardner, D.M. Gassner, J. Hock, H. Huang, P.F. Ingrassia, J.P. Jamilkowski, T. Kanesue, C. Liu, Y. Luo, G.J. Marr, A. Marusic, C. Mi, R.J. Michnoff, T.A. Miller, M.G. Minty, C. Montag, A.I. Pikin, V.H. Ranjbar, D. Raparia, G. Robert-Demolaize, T. Roser, T. Samms, P. Sampson, V. Schoefer, T.C. Shrey, K.S. Smith, Y. Tan, S. Tepikian, R. Than, P. Thieberger, A. Zaltsman, K. Zeno
BNL, Upton, Long Island, New York, USA
S.M. White
ESRF, Grenoble, France

Funding: Work supported by Brookhaven Science Associates, LLC under Con- tract No. DE-AC02-98CH10886 with the U.S. Dept. of Energy.
In recent years the proton and ion beam intensity (as well as the current density) at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory improved considerably. Thanks to an upgrade of the polarized proton source we plan to increase the proton intensity to 3.0·10¹¹ per bunch. In order to accommodate the amplified beam-beam effect originating from proton beams with this unprecedented intensity, a beam-beam compensation scheme with a new lattice and two electron lenses (e-lenses) was installed, commissioned and began operation during the 2015 polarized 100 GeV proton Run.

Slides THAM7X01 [6.649 MB]

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Paper	Title	Page
TUAM1X01	A Two Particle Model for Study of Effects of Space-Charge Force on Strong Head-Tail Instabilities.
	Y.H. Chin KEK, Ibaraki, Japan M. Blaskiewicz BNL, Upton, Long Island, New York, USA A. Chao SLAC, Menlo Park, California, USA Y. Shobuda JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
	In this talk, I present a new two particle model for study of strong head-tail instabilities in the presence of the space-charge force. It is a simple expansion of the well-known two particle model. No chromaticity effect is included. It leads to a formula for the growth rate as a function of the two dimensionless parameters: the space-charge tune shift parameter (normalized by the synchrotron tune) and the wake field strength, Υ. The 3-dimensional contour plot of the growth rate as a function of those two dimensionless parameters reveals stopband structures. Many simulation results generally indicate that a strong head-tail instability can be damped by a weak space-charge force, but the beam becomes unstable again when the space-charge force is further increased. The new two particle model indicates a similar behavior. In weak space-charge regions, additional tune shifts by the space-charge force dissolve the mode-coupling. As the space-charge force is increased, they conversely restore the mode-coupling, but then a further increase of the space-charge force decouples the modes again. This mode coupling/decoupling behavior creates the stopbands structures.
	Slides TUAM1X01 [9.082 MB]
Export •	reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THAM7X01	RHIC Operation and e-lens Commissioning
	X. Gu, J.G. Alessi, Z. Altinbas, E.N. Beebe, M. Blaskiewicz, J.M. Brennan, D. Bruno, M.R. Costanzo, W. Fischer, C.J. Gardner, D.M. Gassner, J. Hock, H. Huang, P.F. Ingrassia, J.P. Jamilkowski, T. Kanesue, C. Liu, Y. Luo, G.J. Marr, A. Marusic, C. Mi, R.J. Michnoff, T.A. Miller, M.G. Minty, C. Montag, A.I. Pikin, V.H. Ranjbar, D. Raparia, G. Robert-Demolaize, T. Roser, T. Samms, P. Sampson, V. Schoefer, T.C. Shrey, K.S. Smith, Y. Tan, S. Tepikian, R. Than, P. Thieberger, A. Zaltsman, K. Zeno BNL, Upton, Long Island, New York, USA S.M. White ESRF, Grenoble, France
	Funding: Work supported by Brookhaven Science Associates, LLC under Con- tract No. DE-AC02-98CH10886 with the U.S. Dept. of Energy. In recent years the proton and ion beam intensity (as well as the current density) at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory improved considerably. Thanks to an upgrade of the polarized proton source we plan to increase the proton intensity to 3.0·10¹¹ per bunch. In order to accommodate the amplified beam-beam effect originating from proton beams with this unprecedented intensity, a beam-beam compensation scheme with a new lattice and two electron lenses (e-lenses) was installed, commissioned and began operation during the 2015 polarized 100 GeV proton Run.
	Slides THAM7X01 [6.649 MB]
Export •	reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)