IPAC2011 - List of Authors (Buesser, K.)

Paper	Title	Page
TUPC004	The Luminosity for the ILC Travelling Focus Regime with Offsets and Angle Scans*	991
	L.I. Malysheva, O.S. Adeyemi, V.S. Kovalenko, A. Ushakov University of Hamburg, Hamburg, Germany K. Buesser, A.F. Hartin, G.A. Moortgat-Pick, N.J. Walker DESY, Hamburg, Germany S. Riemann, F. Staufenbiel DESY Zeuthen, Zeuthen, Germany
	One of the crucial challenges of a future linear collider is to provide high luminosity. In the current ILC design a luminosity of 2x10³⁴ is foreseen. In order to enhance the luminosity, use of the “travelling focus” scheme is under discussion. Within this regime the hourglass effect at the interaction point can be effectively overcome by judiciously arranging for the head and tail of the bunches to be focused at a proportionally displaced longitudinal position. The effect is further enhanced by the strong beam-beam interaction which continuously focuses the bunches during collision. In principle travelling focus could provide an additional 30% luminosity. Nevertheless the regime is highly sensitive to beam-beam transverse and angular offsets at the collision point. The study of the luminosity stability for various ILC parameters using traveling focus will be presented.

Paper

Title

Page

The Luminosity for the ILC Travelling Focus Regime with Offsets and Angle Scans*

991

L.I. Malysheva, O.S. Adeyemi, V.S. Kovalenko, A. Ushakov
University of Hamburg, Hamburg, Germany
K. Buesser, A.F. Hartin, G.A. Moortgat-Pick, N.J. Walker
DESY, Hamburg, Germany
S. Riemann, F. Staufenbiel
DESY Zeuthen, Zeuthen, Germany

One of the crucial challenges of a future linear collider is to provide high luminosity. In the current ILC design a luminosity of 2x10³⁴ is foreseen. In order to enhance the luminosity, use of the “travelling focus” scheme is under discussion. Within this regime the hourglass effect at the interaction point can be effectively overcome by judiciously arranging for the head and tail of the bunches to be focused at a proportionally displaced longitudinal position. The effect is further enhanced by the strong beam-beam interaction which continuously focuses the bunches during collision. In principle travelling focus could provide an additional 30% luminosity. Nevertheless the regime is highly sensitive to beam-beam transverse and angular offsets at the collision point. The study of the luminosity stability for various ILC parameters using traveling focus will be presented.