Simulation of backgrounds in detectors and energy deposition in superconducting magnets at μ+μ− colliders

Abstract

A calculational approach is described to study beam induced radiation effects in detector and storage ring components at high-energy high-luminosity + ? colliders. The details of the corresponding physics process simulations used in the MARS code are given. Contributions of electromagnetic showers, synchrotron radiation, hadrons and daughter muons to the background rates in a generic detector for a 2 2 TeV + ? collider are investigated. Four configurations of the inner triplet and a detector are examined for two sources: muon decays and beam halo interactions in the lattice elements. The beam induced power density in superconducting magnets is calculated and ways to reduce it are proposed. FIGURE 1. Schematic of muon collider inner triplet and detector [4] (Configuration 1). Dimensions are in meters.

Simulated Detector Performance at the Muon Collider

“…Most of the results presented in this manuscript do not simulate the spread of collisions in the transverse and longitudinal directions, unless otherwise stated; it is expected that this has a minor impact on the performance, and it is discussed explicitly when relevant. One of the biggest challenges for a MCD is to successfully disentangle the products of the µ + µ − collisions from an intense beam-induced background (BIB) coming primarily from secondary and tertiary interactions of the muon decay products [51][52][53]. Section 2 summarizes the main characteristics expected for such a background and also includes a discussion on the expected background composition for higher center-of-mass energy muon colliders.…”

Muon-Muon and Other High Energy Colliders

“…More importantly, it helped develop the tools and strategy to do such an optimization as the lattice is further developed. A second study [69] using a somewhat different final focus design and selecting shielding parameters has given results that are of the same order of magnitude as those that will be discussed in detail here.…”

Muon Collider Forum report

“…The expected characteristics of BIB depend on the beam properties, accelerator lattice, interaction region as well as detector design. Detailed simulation studies have been performed [227] using the MARS15 [228] software and, more recently [225,229,230], using a combination of Linebuilder [231] -48 -…”