Waist Corrections at the Interaction Point of ATF2 in the Presence of IPBSM Fringe Rotations and Input Beam Sigma13, Sigma24

S. Bai (1) , J. Gao (1) , P. Bambade (2)

1 IHEP - Institute of High Energy Physics
2 ATF2

The ATF2 project is the final focus system prototype for ILC and CLIC linear collider projects, with a purpose to reach a 37nm vertical beam size at the interaction point. In beam tuning towards the goal beam size, the presence of a tilt of the IP Shintake monitor fringe pattern with respect to the x-y coordinate system of the beam (or equivalently a σ13 correlation), as well as a σ24 correlation, can break the orthogonality in the main σ34 and σ32 waist corrections during the minimization and result in larger vertical beam sizes at IP. Both effects are studied, analytically and in simulation, and a practical procedure is suggested for diagnosing the presence of a residual fringe tilt, by measuring the influence of the horizontal waist correction on the minimum vertical beam size.

Domaines: Physique des accélérateurs [physics.acc-ph]

S. Bai, J. Gao, P. Bambade. Waist Corrections at the Interaction Point of ATF2 in the Presence of IPBSM Fringe Rotations and Input Beam Sigma13, Sigma24. International Particle Accelerator Conference - IPAC'12, May 2012, New Orleans, United States. Joint Accelerator Conferences Website, TUPPC023, pp.1212-1214, 2012. ⟨in2p3-00703984⟩