Using octupoles for background control in linear colliders -- An exploratory conceptual study [report]

R Pitthan
2000 unpublished
If one adds a suited Octupole or an even higher multipole lattice to linear collider Quadrupole FODO lattices, the amplifying properties of the combined lattice drive particles in the tails, but not those in the core, into resonant losses. This approach is quite di erent in concept and beam dynamics impact from past proposed use of non-linear elements for collimation. This non-traditional scheme for background control has the added advantage that most, or maybe all, of the Halo collimation can
more » ... lo collimation can be done using the lever arm of the real estate of the main accelerators, thus reducing the costly length of a separate dedicated collimation section and also unifying machine protection and background control. Simulations of particle distributions are presented. This approach requires cooperation by the designers of the accelerators, the beam delivery system, and the Detector, because a careful balance between sometimes con icting requirements has to be found. As a second component of this approach the use of Octupoles right before the nal focusing Quadrupoles is proposed in order to enlarge the e ective beam stay clear by a factor of 2-3, thus reducing the requirements for collimation. This concept would reduce the requirement for collimation but simulation have not been carried out here in detail. To further explore and implement this concept will require a considerable e ort in manpower, possibly comparable to, although less in scope, than the e ort to develop the NLC RF or the CLIC RF schemes.
doi:10.2172/753321 fatcat:nd2u4yptprgo5mrdhu6w3fui5a