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Events on Tuesday, October 5th, 2021

High Energy Seminar
Studies for a Low EMittance Muon Accelerator (LEMMA)
Time: 10:00 am
Place: Video Recording:
Speaker: Manuela Boscolo & Marco Zanetti, INFN
Abstract: The concept of LEMMA uses a positron beam of about 45 GeV interacting on electrons on target. We will discuss the challenges, future plans and prospects of this proposal. We will present the accelerator scheme, with the optics and beam dynamics performed so far on the positron and muon beams. We will describe the challenges on the muon production target for a Multi-TeV muon collider in the 10^35 cm^-2 s^-1 luminosity range. An experimental program aiming to study the features of the process e+e- -> mu+mu- close to the production threshold, by using a positron beam of energy greater than 44 GeV on a solid target, is ongoing at the SPS CERN facility. The main goals are the precise measurement of the muon pair production rate and the emittance of the produced beam as a function of the center-of-mass energy and for different kind of targets. A summary of the 2018 beam test and the perspectives of the test beam planned for 2022 with an improved experimental setup will be presented. Video link:
Host: Sridhara Dasu
Presentation: LEMMA_seminar_6oct.pdf
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Thesis Defense
Instrumentation and Commissioning of the Prototype Schwarzschild-Couder Telescope Camera
Time: 1:00 pm
Place: 4274 Chamberlin Hall and Zoom:
Speaker: Leslie Taylor, Physics PhD Graduate Student
Host: Justin Vandenbroucke, Faculty Advisor
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Network in Neutrinos, Nuclear Astrophysics, and Symmetries (N3AS) Seminar
Mode-by-mode Relative Binning: Fast Likelihood Estimation for Gravitational Waveforms with Spin-Orbit Precession and Multiple Harmonics
Time: 2:00 pm
Speaker: Nathaniel Leslie, UC Berkeley
Abstract: Faster likelihood evaluation enhances the efficiency of gravitational wave signal analysis. We present Mode-by-mode Relative Binning (MRB), a new method designed for obtaining fast and accurate likelihoods for advanced waveform models that include spin-orbit precession effects and multiple radiation harmonics from compact binary coalescence. Leveraging the ``twisting-up'' procedure of constructing precessing waveform modes from non-precessing ones, the new method mitigates degrade of relative binning accuracy due to interference from superimposed modes. Additionally, we supplement algorithms for optimizing the choice of frequency bins specific to any given strain signal under analysis. Using the new method, we are able to evaluate the likelihood with up to an order of magnitude reduction in the number of waveform model calls per frequency compared to the previously used relative binning scheme, and achieve better likelihood accuracy than is sufficient for obtaining source parameter posterior distributions that are indistinguishable from the exact ones.
Host: Baha Balantekin
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Council Meeting
Time: 4:00 pm
Place: 2314 Chamberlin
Speaker: Mark Eriksson, UW-Madison, Department of Physics
Host: Mark Eriksson
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