arXiv subjects

Lewis Keller

Publications and source records attributed to Lewis Keller.

3 recordsLinked to original sources

arXiv2019

Simulation of Muon Background at the ILC

Beginning with the first linear collider, SLC at SLAC, it was quickly discovered that high energy muons that are produced in halo collimators in the beam delivery system can cause a significant background in the experiment detector. Following publication of the ILC Technical Design Report, May 2013 [1] a simulation of this background has been made using simulation codes MUCARLO and GEANT4. It became clear that to mitigate this background, various magnetic devices were going to be needed.

physics.acc-ph↗

arXiv2017

A Study of the Impact of Muons from the Beam Delivery System on the SiD Performance

To suppress the muon background arising from the Beam Delivery System (BDS) of the International Linear Collider (ILC), and to hinder it from reaching the interaction region, two different shielding scenarios are under discussion: five cylindrical muon spoilers with or without an additional magnetized shielding wall. Due to cost and safety issues, the scenario preferred by the Machine-Detector-Interface (MDI) group is to omit the shielding wall, although omitting it also has disadvantages. To support the decision making for the muon shielding, the impact of the muons from the two different shielding scenarios was studied in a full Geant4 detector simulation of the SiD detector, one of two proposed detectors for the ILC. Input to this study is the muon background created by the beam traveling through the BDS, which was simulated with MUCARLO.

physics.ins-det↗

arXiv2001

Test Beams and Polarized Fixed Target Beams at the NLC

A conceptual program to use NLC beams for test beams and fixed target physics is described. Primary undisrupted polarized beams would be the most simple to use, but for NLC, the disrupted beams are of good enough quality that they could also be used, after collimation of the low energy tails, for test beams and fixed target physics. Pertinent issues are: what is the compelling physics, what are the requirements on beams and running time, and what is the impact on colliding beam physics running. A list of physics topics is given; one topic Moller Scattering is treated in more depth.

physics.acc-ph↗