PAC2013 - List of Authors (Lee, H.-J.)

Paper	Title	Page
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.

Paper

Title

Page

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.