PAC2013 - List of Authors (Valishev, A.)

Paper

Title

Page

Beam-Beam Limit in an Integrable System

75

A. Valishev, S. Nagaitsev
Fermilab, Batavia, USA
V.V. Danilov
ORNL, Oak Ridge, Tennessee, USA
D.N. Shatilov
BINP SB RAS, Novosibirsk, Russia

Funding: Fermi Research Alliance, LLC operates Fermilab under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy.
Round colliding beams have been proposed as a way to push the attainable beam-beam tune shift limit, and recent successful experiments at the VEPP-2000 collider at BINP demonstrated the viability of the concept. In a round-beam system the dynamical stability is improved by introducing an additional integral of motion, which effectively reduces the system from a two and a half dimensional to one and a half dimensional. In this report we discuss the possible further improvement through adding the second integral of motion and thus making the system fully integrable. We explore the ultimate beam-beam limit in such a system using numerical simulations taking into account various imperfections.

Slides MOODB1 [1.019 MB]

TUOCA1

Collimation with Hollow Electron Beams: A Proposed Design for the LHC Upgrade

413

G. Stancari, V. Previtali, A. Valishev
Fermilab, Batavia, USA
R. Bruce, S. Redaelli, A. Rossi, B. Salvachua
CERN, Geneva, Switzerland
V. Moens
EPFL, Lausanne, Switzerland

Funding: Fermi Research Alliance, LLC operates Fermilab under Contract DE-AC02-07CH11359 with the US Department of Energy. Research supported in part by US LARP and EU FP7 HiLumi LHC, Grant Agreement 284404.
Collimation with hollow electron beams is a technique for halo removal in high-power hadron beams. The concept was tested experimentally at the Fermilab Tevatron collider using a hollow electron gun installed in one of the Tevatron electron lenses. Within the US LHC Accelerator Research Program and the European HiLumi LHC Design Study, we are investigating the applicability of this technique to the Large Hadron Collider and a conceptual design is being developed. We review some of the main topics related to this study: motivation; halo removal processes; development of hollow electron guns; effects on the proton beam core; and integration in the LHC machine.

Slides TUOCA1 [4.294 MB]

TUPAC15

Calculation of the Kick Maps Generated by a Hollow Electron Lens for Studies of High-energy Hadron Beam Collimation

481

G. Stancari, M. Chung, A. Valishev
Fermilab, Batavia, USA
H.-J. Lee
Pusan National University, Pusan, Republic of Korea
V. Moens
EPFL, Lausanne, Switzerland

Funding: Fermi Research Alliance, LLC operates Fermilab under Contract DE-AC02-07CH11359 with the US Department of Energy. Research supported in part by US LARP and EU FP7 HiLumi LHC, Grant Agreement 284404.
Collimation with hollow electron beams is a technique for halo removal in high-power hadron beams. It was experimentally studied at the Fermilab Tevatron collider using electron lenses and it is being considered as an option to complement the collimation system for the LHC upgrades. In the ideal case, the magnetically confined electron beam has a hollow, axially symmetric current-density distribution, whose fields affect the beam halo, leaving the core of the circulating beam unperturbed. We address the effects of imperfections in the current density based upon profiles measured in the Fermilab electron lens test stand. We also study the effect of the bends used to inject and to extract the electron beam from the overlap region. The calculated field distributions will serve as inputs for tracking simulations, which are needed to estimate the effects of the electron lens imperfections on beam core dynamics, such as nonlinearities and emittance growth.

TUPBA21

Beam-Beam Studies for HL-LHC

568

A. Valishev
Fermilab, Batavia, USA
D. Banfi, J. Barranco
EPFL, Lausanne, Switzerland
T. Pieloni
CERN, Geneva, Switzerland
D.N. Shatilov
BINP SB RAS, Novosibirsk, Russia

Funding: Fermi Research Alliance, LLC operates Fermilab under contract with the U.S. Dept. of Energy. This work was supported by the US LARP. The HiLumi LHC Design Study is funded by the European Commission.
The analysis of beam-beam effects for the High Luminosity LHC upgrade is in progress as a part of HiLumi LHC Design Study. We report on the current status of beam-beam simulations with the particular emphasis on single and multi-particle weak-strong tracking studies. We evaluate the latest LH-LHC performance scenario, and outline the plan of further research.

WEPBA17

Measurement of Non-Linear Insert Magnets

922

F.H. O'Shea, R.B. Agustsson, A.Y. Murokh, E. Spranza
RadiaBeam, Marina del Rey, USA
S. Nagaitsev, A. Valishev
Fermilab, Batavia, USA

Fermilab's Integrable Optics Test Accelerator (IOTA) is an electron storage ring designed for testing advanced accelerator physics concepts, including implementation of nonlinear integrable beam optics and experiments on optical stochastic cooling. In this report we describe the contribution of RadiaBeam Technologies to the IOTA project which includes nonlinear magnet engineering, production and measurement.

Paper	Title	Page
MOODB1	Beam-Beam Limit in an Integrable System	75
	A. Valishev, S. Nagaitsev Fermilab, Batavia, USA V.V. Danilov ORNL, Oak Ridge, Tennessee, USA D.N. Shatilov BINP SB RAS, Novosibirsk, Russia
	Funding: Fermi Research Alliance, LLC operates Fermilab under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy. Round colliding beams have been proposed as a way to push the attainable beam-beam tune shift limit, and recent successful experiments at the VEPP-2000 collider at BINP demonstrated the viability of the concept. In a round-beam system the dynamical stability is improved by introducing an additional integral of motion, which effectively reduces the system from a two and a half dimensional to one and a half dimensional. In this report we discuss the possible further improvement through adding the second integral of motion and thus making the system fully integrable. We explore the ultimate beam-beam limit in such a system using numerical simulations taking into account various imperfections.
	Slides MOODB1 [1.019 MB]

TUOCA1	Collimation with Hollow Electron Beams: A Proposed Design for the LHC Upgrade	413
	G. Stancari, V. Previtali, A. Valishev Fermilab, Batavia, USA R. Bruce, S. Redaelli, A. Rossi, B. Salvachua CERN, Geneva, Switzerland V. Moens EPFL, Lausanne, Switzerland
	Funding: Fermi Research Alliance, LLC operates Fermilab under Contract DE-AC02-07CH11359 with the US Department of Energy. Research supported in part by US LARP and EU FP7 HiLumi LHC, Grant Agreement 284404. Collimation with hollow electron beams is a technique for halo removal in high-power hadron beams. The concept was tested experimentally at the Fermilab Tevatron collider using a hollow electron gun installed in one of the Tevatron electron lenses. Within the US LHC Accelerator Research Program and the European HiLumi LHC Design Study, we are investigating the applicability of this technique to the Large Hadron Collider and a conceptual design is being developed. We review some of the main topics related to this study: motivation; halo removal processes; development of hollow electron guns; effects on the proton beam core; and integration in the LHC machine.
	Slides TUOCA1 [4.294 MB]

TUPAC15	Calculation of the Kick Maps Generated by a Hollow Electron Lens for Studies of High-energy Hadron Beam Collimation	481
	G. Stancari, M. Chung, A. Valishev Fermilab, Batavia, USA H.-J. Lee Pusan National University, Pusan, Republic of Korea V. Moens EPFL, Lausanne, Switzerland
	Funding: Fermi Research Alliance, LLC operates Fermilab under Contract DE-AC02-07CH11359 with the US Department of Energy. Research supported in part by US LARP and EU FP7 HiLumi LHC, Grant Agreement 284404. Collimation with hollow electron beams is a technique for halo removal in high-power hadron beams. It was experimentally studied at the Fermilab Tevatron collider using electron lenses and it is being considered as an option to complement the collimation system for the LHC upgrades. In the ideal case, the magnetically confined electron beam has a hollow, axially symmetric current-density distribution, whose fields affect the beam halo, leaving the core of the circulating beam unperturbed. We address the effects of imperfections in the current density based upon profiles measured in the Fermilab electron lens test stand. We also study the effect of the bends used to inject and to extract the electron beam from the overlap region. The calculated field distributions will serve as inputs for tracking simulations, which are needed to estimate the effects of the electron lens imperfections on beam core dynamics, such as nonlinearities and emittance growth.

TUPBA21	Beam-Beam Studies for HL-LHC	568
	A. Valishev Fermilab, Batavia, USA D. Banfi, J. Barranco EPFL, Lausanne, Switzerland T. Pieloni CERN, Geneva, Switzerland D.N. Shatilov BINP SB RAS, Novosibirsk, Russia
	Funding: Fermi Research Alliance, LLC operates Fermilab under contract with the U.S. Dept. of Energy. This work was supported by the US LARP. The HiLumi LHC Design Study is funded by the European Commission. The analysis of beam-beam effects for the High Luminosity LHC upgrade is in progress as a part of HiLumi LHC Design Study. We report on the current status of beam-beam simulations with the particular emphasis on single and multi-particle weak-strong tracking studies. We evaluate the latest LH-LHC performance scenario, and outline the plan of further research.

WEPBA17	Measurement of Non-Linear Insert Magnets	922
	F.H. O'Shea, R.B. Agustsson, A.Y. Murokh, E. Spranza RadiaBeam, Marina del Rey, USA S. Nagaitsev, A. Valishev Fermilab, Batavia, USA
	Fermilab's Integrable Optics Test Accelerator (IOTA) is an electron storage ring designed for testing advanced accelerator physics concepts, including implementation of nonlinear integrable beam optics and experiments on optical stochastic cooling. In this report we describe the contribution of RadiaBeam Technologies to the IOTA project which includes nonlinear magnet engineering, production and measurement.