TY  - CONF
AU  - Franchetti, Giuliano
AU  - Zimmermann, Frank
A3  - Zimmermann, Frank
A3  - Tanaka, Hitoshi
A3  - Sudmuang, Porntip
A3  - Klysubun, Prapong
A3  - Sunwong, Prapaiwan
A3  - Chanwattana, Thakonwat
A3  - Petit-Jean-Genaz, Christine
A3  - Schaa, Volker R. W.
TI  - Trapping of Neutral Molecules by the Electromagnetic Beam Field
CY  - Geneva, Switzerland
PB  - JACoW Publishing
M1  - GSI-2025-00490
SP  - 1649-1654
PY  - 2022
N1  - Creative Commons CC logoPub­lished by JACoW Pub­lish­ing under the terms of the Cre­ative Com­mons At­tri­bu­tion 3.0 In­ter­na­tional li­cense.
AB  - Neutral uncharged molecules are affected by the electromagnetic field of a charged particle beam if they carry either an electric or a magnetic dipole moment. The residual gas in an accelerator beam pipe consists of such molecules. In this paper we study their dynamics. Under a few approximations, whose validity we explore and justify, we derive the equations of motion of neutral molecules and their invariants, determine the conditions for these neutral molecules to become trapped in the field of the beams as function of beam-pipe temperature, and compute the resulting enhancement of molecule density in the vicinity of the beam. We demonstrate that large agglomerates of molecules, 'flakes,' are much more likely to be pulled into the beam than single molecules, and suggest that this phenomenon might help explain some beam observations at the Large Hadron Collider.
T2  - 13th International Particle Accelerator Conference
CY  - 12 Jun 2022 - 17 Jun 2022, Bangkok (Thailand)
Y2  - 12 Jun 2022 - 17 Jun 2022
M2  - Bangkok, Thailand
KW  - Accelerator Physics (Other)
KW  - MC5: Beam Dynamics and EM Fields (Other)
LB  - PUB:(DE-HGF)8
DO  - DOI:10.18429/JACOW-IPAC2022-WEIZSP2
UR  - https://repository.gsi.de/record/357836
ER  -