Trapping of neutral molecules by the beam electromagnetic field

Neutral uncharged molecules are affected by the electromagnetic field of a charged particle beam if they carry either an electric or magnetic dipole moment. The residual gas in accelerator pipe consists such molecules. In this paper we study their dynamics. Under few approximations, whose validity explore and justify, derive equations motion neutral invariants, determine conditions for these to become trapped beams as function beam-pipe temperature, compute resulting enhancement molecule density vicinity beam. We demonstrate that large agglomerates molecules, “flakes,” much more likely be pulled into than single suggest phenomenon might help explain some observations at Large Hadron Collider.19 MoreReceived 12 January 2021Accepted 8 March 2021DOI:https://doi.org/10.1103/PhysRevAccelBeams.24.054001Published American Physical Society under terms Creative Commons Attribution 4.0 International license. Further distribution work must maintain attribution author(s) published article’s title, journal citation, DOI.Published SocietyPhysics Subject Headings (PhySH)Research AreasNonlinear dynamicsRelativistic multiple-particle dynamicsSingle-particle dynamicsAccelerators & Beams