The superconducting magnets of the ILC beam delivery system

Abstract

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. Presented at the 2007 AbstractThe 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.

Effects of Magnet Errors in the ILC 14 mrad Extraction Line

“…These two quadrupoles and the incoming sextupole SD0 will be part of a detector in a push-pull configuration [5]. Beam apertures of the extraction SC quadrupoles QDEX1 and QFEX2A are set to the maximum values of R = 15 mm and 30 mm, respectively, limited by the separation from the incoming magnets.…”

“…It is assumed that the incoming beam at IP has the design parameters except an uncorrected 50 μrad vertical orbit angle generated by the upstream part of the solenoid and anti-DID. The calculations are done for the push-pull version of the extraction optics [4,5] with the final focus drift of § § Work supported by the U.S. Department of Energy contract DE-AC02-76SF00515 and by the Cockcroft Institute, University of Manchester, UK. *** Author's present address.…”

Superconducting magnet needs for the ILC

“…Brett Parker (BNL), responsible for the design of these superconducting magnets, has been providing novel solutions to meet the many challenging constraints in this area [14]. Other superconducting magnets in the BDS include a dipole -"detector integrated dipole" -located around the intersection point on the outer support cylinder of the solenoid to compensate for the vertical deflection of the incoming beam, which is at an angle to the solenoid axis; and octupole correctors -"tail-folding octupoles" -which are upstream of the IR.. Table 5 below provides a detailed list of the IR magnets used in the RDR design and reveals more of the complexity of magnet design in this area.…”

Construction and Operational Experience With a Superconducting Octupole Used to Trap Antihydrogen

“…Magnets made at the Direct Wind facility have been installed in facilities at the DESY [3], IHEP (Beijing), and J-PARC [4], are being produced for an electron lens at RHIC [5], and are being prototyped as part of the ILC R&D [6], [7]. Another paper to this conference discusses common features of Direct Wind magnets [8].…”