Numerical investigation of beam halo from beam gas scattering in KEK-ATF

8th International Particle Accelerator Conference

Yang, R.^1 ; Bambade, P.^1 ; Kubo, K.^2 ; Okugi, T.^2 ; Terunuma, N.^2 ; Zhou, D.^2

Laboratoire de l'Accélérateur Linéaire (LAL), Univ. Paris-Sud, CNRS, IN2P3, Universit Paris-Saclay, Orsay, France^1

High Energy Accelerator Research Organization (KEK), Tsukuba, Japan^2

关键词: Beam halo formation;    Coulomb scattering;    Gas scattering;    Laser interferometer;    Linear colliders;    Machine parameters;    Numerical investigations;    Virtual interactions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/874/1/012063/pdf
DOI  :  10.1088/1742-6596/874/1/012063

来源: IOP

【 摘 要 】

To demonstrate the final focus schemes of the Future Linear Collider (FLC), the Accelerator Test Facility 2 (ATF2) at KEK is devoted to focus the beam to a RMS size of a few tens of nanometers (nm) vertically and to provide stability at the nm level at the virtual Interaction Point (IP). However, the loss of halo particles upstream will introduce background to the diagnostic instrument measuring the ultra-small beam, using a laser interferometer monitor. To help the realization of the above goals and beam operation, understanding and mitigation of beam halo are crucial. In this paper, we present the systematical simulation of beam halo formation from beam gas Coulomb scattering (BGS) in the ATF damping ring. The behavior of beam halo with various machine parameters is also discussed.