Beam Dynamics Newsletter

In this paper we summarize the evolution and contributions of superconducting magnets to particle accelerators as chronicled over the last 50 years of Particle Accelerator Conferences (PAC, NA-PAC and IPAC). We begin with an historical overview based primarily on PAC Proceedings augmented with references to key milestones in the development of superconducting magnets for particle accelerators. We then provide some illustrative examples of applications that have occurred over the past 50 years, focusing on those that have either been realized in practice or provided technical development for other projects, with discussion of possible future applications.

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Superconducting Magnets for Particle Accelerators

The ILC beam delivery system (BDS) uses a variety of superconducting magnets to maximize luminosity and minimize background. Compact final focus quadrupoles with multifunction correction coils focus incoming beams to few nanometer spot sizes while focusing outgoing disrupted beams into a separate extraction beam line. Anti-solenoids mitigate effects from overlapping focusing and the detector solenoid field. Far from the interaction point (IP) strong octupoles help minimize IP backgrounds. A low-field but very large aperture dipole is integrated with the detector solenoid to reduce backgrounds from beamstrahlung pairs generated at the IP. Physics requirements and magnetic design solutions for the BDS superconducting magnets are reviewed in this paper.

/pdf/the-superconducting-magnets-of-the-ilc-beam-delivery-system-2wr3s58jxg.pdf

The superconducting magnets of the ILC beam delivery system

An RF deflecting structure has been designed and fabricated for a transverse-to-longitudinal emittance exchange experiment at Argonne National Laboratory (ANL) [Y-E Sun, et al, Design study of a transverse-to-longitudinal emittance exchange proof-of-principle experiment, in: Proceedings of PAC-2007, Albuquerque, NM, USA, 2007, pp 3441–3443 [1] ] The structure is a 1300 MHz normal conducting RF cavity consisting of three cells operating in a dipole ( TM 110 -like) mode As high as 34 MV deflecting voltage is required for the experiment In this paper, we present detailed RF design of the cavity, particle tracking simulations in the cavity and low power RF measurement results in comparison with numerical simulations The cavity cell geometries (gaps in particular) are optimized to giving a zero orbit offset for particles crossing the cavity with zero-phase

A 3-cell deflecting rf cavity for emittance exchange experiment at ANL.

The collimation systems of the International Linear Collider (ILC) Beam Delivery System (BDS) must perform efficient removal of halo particles which lie outside the acceptable ranges of energy and spatial spread. An optimisation strategy based on earlier work is applied to the latest version of the BDS lattice. The resulting improvement in collimation performance is studied by halo tracking simulations, and the luminosity performance of the optimised lattice is also examined.

/pdf/collimation-optimisation-in-the-beam-delivery-system-of-the-4kmrjzyqnn.pdf

Collimation optimisation in the beam delivery system of the International Linear Collider

The beam delivery system for the linear collider focuses beams to nanometer sizes at its interaction point, collimates the beam halo to provide acceptable background in the detector and has a provision for state-of-the art beam instrumentation in order to reach the ILC's physics goals. This paper describes the design details and status of the baseline configuration considered for the reference design and also lists alternatives.

/pdf/design-of-the-beam-delivery-system-for-the-international-4bpn3jgs7a.pdf

Design of the beam delivery system for the international linear collider

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Design of the beam delivery system for the international linear collider