Abstract

A possible scenario for the luminosity upgrade of the Large Hadron Collider is based on large aperture quadrupoles to lower ${\ensuremath{\beta}}^{*}$ in the interaction regions. Here we analyze the measurements relative to the field quality of the RHIC and LHC superconducting quadrupoles to find out the dependence of field errors on the size of the magnet aperture. Data are interpreted in the framework of a Monte Carlo analysis giving the reproducibility in the coil positioning reached in each production. We show that this precision is likely to be independent of the magnet aperture. Using this result, we can carry out an estimate of the impact of the field quality on the beam dynamics for the collision optics.

Highlights

  • The lowinsertion in the interaction region of the Large Hadron Collider (LHC) consists of a triplet of superconducting quadrupoles [1,2,3] to focus the beam in the interaction point (IP)

  • We showed that large aperture quadrupoles are expected to have a better field quality; we study the effect of this improvement on the beam dynamics in the collision optics, where, due to the high value of the -functions, the contribution of lowquadrupoles is dominant

  • A scheme for the upgrade on the LHC lowinsertions is based on large aperture superconducting quadrupoles: in this work we aimed at finding scaling laws for evaluating the expected field quality and the impact on the beam dynamics in the collision optics

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Summary

INTRODUCTION

The lowinsertion in the interaction region of the Large Hadron Collider (LHC) consists of a triplet of superconducting quadrupoles [1,2,3] to focus the beam in the interaction point (IP). The quadrupole aperture allows reaching a value of 0.55 m in the IP In these quadrupoles, the functions at collision reach 4400 m, corresponding to a beam size radius at 10 of 15 mm, and requiring a quadrupole aperture of 70 mm [1]. A large aperture is used for allowing a larger function in the triplet, giving a smaller in the IP, but it can be used to have an additional shielding to prevent power deposition in the magnet coils.

FIELD QUALITY IN RHIC AND LHC QUADRUPOLES
A SCALING LAW FOR FIELD ERRORS
IMPACT ON BEAM DYNAMICS
G B b4 Rref 2
Aberrations proportional to field derivatives
Detuning induced by sextupoles
Findings
CONCLUSIONS
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