2011 Particle Accelerator Conference - List of Authors (Pivi, M.T.F.)

Paper	Title	Page
TUP293	ESTB: A New Beam Test Facility at SLAC	1373
	M.T.F. Pivi, H. Fieguth, C. Hast, R.H. Iverson, J. Jaros, R.K. Jobe, L. Keller, D.R. Walz, S.P. Weathersby, M. Woods SLAC, Menlo Park, California, USA
	End Station Test Beam (ESTB) is an end beam line at SLAC using a small fraction of the 13.6 GeV electron beam from the Linac Coherent Light Source (LCLS), restoring test beam capabilities in the large End Station A (ESA) experimental hall. In the past, 18 institutions participated in the ESA program at SLAC. The ESTB program will provide one of a kind test beams essential for developing accelerator instrumentation and accelerator R&D, performing particle and astroparticle physics detector research, linear collider machine and detector interface (MDI) R&D, developing of radiation-hard detectors and material damage studies with several distinctive features. At this stage, 4 new kicker magnets are added to divert 5 Hz of LCLS beam to the A-line, a new beam dump is installed and a new PPS system is built in ESA. In a second stage, a secondary hadron target will be installed, able to produce pions up to about 12 GeV/c at 1 particle/pulse. In summary, ESTB provides a new test facility for LHC detector upgrades, Super B Factory detector development, and Linear Collider accelerator and detector R&D with the first beam expected by June and users starting operations by July 2011.

WEP079	Mathematical Models of Feedback Systems for Control of Intra-Bunch Instabilities Driven by E-Clouds and TMCI	1621
	C.H. Rivetta, J.D. Fox, T. Mastoridis, M.T.F. Pivi, O. Turgut SLAC, Menlo Park, California, USA W. Höfle CERN, Geneva, Switzerland R. Secondo, J.-L. Vay LBNL, Berkeley, California, USA
	Funding: Work supported by the U.S. Department of Energy under contract # DE-AC02-76SF00515 and the US LHC Accelerator Research Program (LARP). The feedback control of intrabunch instabilities driven by E-Clouds or strong head-tail coupling (TMCI) requires sufficient bandwidth to sense the vertical position and drive multiple sections of a nanosecond scale bunch. These requirements impose challenges and limits in the design and implementation of the feedback system. This paper presents models for the feedback subsystems: receiver, processing channel, amplifier and kicker, that take into account their frequency response and limits. These models are included in multiparticle simulation codes (WARP/CMAD/Head-Tail) and reduced mathematical models of the bunch dynamics to evaluate the impact of subsystem limitations in the bunch stabilization and emittance improvement. With this realistic model of the hardware, it is possible to analyze and design the feedback system. This research is crucial to evaluate the performance boundary of the feedback control system due to cost and technological limitations. These models define the impact of spurious perturbations, noise and parameter variations or mismatching in the performance of the feedback system. The models are validated with simulation codes and measurements of lab prototypes.

WEP109	Simulations of Electron Cloud Induced Instabilities and Emittance Growth for CesrTA	1683
	K.G. Sonnad, K.R. Butler Cornell University, Ithaca, New York, USA G. Dugan, M.A. Palmer CLASSE, Ithaca, New York, USA M.T.F. Pivi SLAC, Menlo Park, California, USA
	Funding: US Department of Energy DE-FC02-08ER41538, National Science Foundation PHY-0734867 We present results of a series of studies obtained using the simulation code CMAD to study how electron clouds affect the dynamics of positron beams in CesrTA. The study complements ongoing experiments dedicated for studying the same phenomena. The simulation involves tracking positrons through the CesrTA lattice and simultaneously computing the force exerted due to space charge of the electrons on each of the tracked positrons. The electrons themselves are allowed to evolve under the influence of the positrons. Several results bear a close resemblance to what has been observed experimentally.

Paper

Title

Page

ESTB: A New Beam Test Facility at SLAC

1373

M.T.F. Pivi, H. Fieguth, C. Hast, R.H. Iverson, J. Jaros, R.K. Jobe, L. Keller, D.R. Walz, S.P. Weathersby, M. Woods
SLAC, Menlo Park, California, USA

End Station Test Beam (ESTB) is an end beam line at SLAC using a small fraction of the 13.6 GeV electron beam from the Linac Coherent Light Source (LCLS), restoring test beam capabilities in the large End Station A (ESA) experimental hall. In the past, 18 institutions participated in the ESA program at SLAC. The ESTB program will provide one of a kind test beams essential for developing accelerator instrumentation and accelerator R&D, performing particle and astroparticle physics detector research, linear collider machine and detector interface (MDI) R&D, developing of radiation-hard detectors and material damage studies with several distinctive features. At this stage, 4 new kicker magnets are added to divert 5 Hz of LCLS beam to the A-line, a new beam dump is installed and a new PPS system is built in ESA. In a second stage, a secondary hadron target will be installed, able to produce pions up to about 12 GeV/c at 1 particle/pulse. In summary, ESTB provides a new test facility for LHC detector upgrades, Super B Factory detector development, and Linear Collider accelerator and detector R&D with the first beam expected by June and users starting operations by July 2011.

WEP079

Mathematical Models of Feedback Systems for Control of Intra-Bunch Instabilities Driven by E-Clouds and TMCI

1621

C.H. Rivetta, J.D. Fox, T. Mastoridis, M.T.F. Pivi, O. Turgut
SLAC, Menlo Park, California, USA
W. Höfle
CERN, Geneva, Switzerland
R. Secondo, J.-L. Vay
LBNL, Berkeley, California, USA

Funding: Work supported by the U.S. Department of Energy under contract # DE-AC02-76SF00515 and the US LHC Accelerator Research Program (LARP).
The feedback control of intrabunch instabilities driven by E-Clouds or strong head-tail coupling (TMCI) requires sufficient bandwidth to sense the vertical position and drive multiple sections of a nanosecond scale bunch. These requirements impose challenges and limits in the design and implementation of the feedback system. This paper presents models for the feedback subsystems: receiver, processing channel, amplifier and kicker, that take into account their frequency response and limits. These models are included in multiparticle simulation codes (WARP/CMAD/Head-Tail) and reduced mathematical models of the bunch dynamics to evaluate the impact of subsystem limitations in the bunch stabilization and emittance improvement. With this realistic model of the hardware, it is possible to analyze and design the feedback system. This research is crucial to evaluate the performance boundary of the feedback control system due to cost and technological limitations. These models define the impact of spurious perturbations, noise and parameter variations or mismatching in the performance of the feedback system. The models are validated with simulation codes and measurements of lab prototypes.

WEP109

Simulations of Electron Cloud Induced Instabilities and Emittance Growth for CesrTA

1683

K.G. Sonnad, K.R. Butler
Cornell University, Ithaca, New York, USA
G. Dugan, M.A. Palmer
CLASSE, Ithaca, New York, USA
M.T.F. Pivi
SLAC, Menlo Park, California, USA

Funding: US Department of Energy DE-FC02-08ER41538, National Science Foundation PHY-0734867
We present results of a series of studies obtained using the simulation code CMAD to study how electron clouds affect the dynamics of positron beams in CesrTA. The study complements ongoing experiments dedicated for studying the same phenomena. The simulation involves tracking positrons through the CesrTA lattice and simultaneously computing the force exerted due to space charge of the electrons on each of the tracked positrons. The electrons themselves are allowed to evolve under the influence of the positrons. Several results bear a close resemblance to what has been observed experimentally.