Bulletin of the American Physical Society
APS April Meeting 2021
Volume 66, Number 5
Saturday–Tuesday, April 17–20, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session D14: Muon Collider Symposium IILive Mini-Symposium
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Sponsoring Units: DPB DPF Chair: Vladimir Shiltsev, FNAL |
Saturday, April 17, 2021 1:30PM - 2:06PM Live |
D14.00001: The Muon Collider Invited Speaker: Daniel Schulte A muon collider has a unique potential to achieve high-energy, high-luminosity lepton collisions that can provide discovery reach and precision measurements at the same time. Therefore the recent Update of the European Strategy for Particle Physics demands to form an international collaboration to study the potential of a muon collider. This collaboration is now forming. Furthermore, the ongoing Snowmass process points to a rapidly growing interest in a muon collider within the US particle physics community. The design is based on the results of the past Muon Accelerator Programme in the US and focuses on a 3 TeV and a 10+ TeV collider option. We will introduce the muon collider concept and challenges as well as the forming collaboration and its plans. [Preview Abstract] |
Saturday, April 17, 2021 2:06PM - 2:18PM Live |
D14.00002: Muon Cooling Channel Design Status Diktys Stratakis A Muon Collider requires a reduction of the six-dimensional emittance of the captured muon beam by several orders of magnitude. We present a complete cooling scheme that should meet this requirement. The scheme starts with the front end of a proposed Neutrino Factory that yields bunch trains of both muon signs. Subsequently, a 6-dimensional ionization cooling lattice reduces the longitudinal emittance until it becomes possible to merge the trains into single bunches, one of each sign. Further 6-dimensional ionization cooling is applied to the single bunches followed by final linear transverse cooling within multi-Tesla solenoids. We review the main accelerator components involved in the above scheme as well detail the required beam and lattice parameters for successful cooling. [Preview Abstract] |
Saturday, April 17, 2021 2:18PM - 2:30PM Live |
D14.00003: Magnet Needs for a Muon Collider Soren Prestemon A muon collider will require a variety of advanced magnet systems of various flavors, including radiation-tolerant solenoid configurations for beam capture at the target and high-field solenoids for the ionization cooling sections, various fast-ramp dipole magnets for the rapid acceleration sections and large-bore dipoles for the muon storage ring, and large-bore focusing optics for the interaction regions. We review the families of magnets needed for a muon collider, and in each case we summarize the current state of the art in magnet performance. The importance of evaluating the tradeoff in muon collider performance with magnet parameters is highlighted, so as to identify the most important magnet design elements that impact a muon collider facility. We summarize the primary technical challenges associated with each flavor of magnet in the context of a muon collider. We will also identify areas of particular interest for integrated design efforts to optimize muon collider performance, where magnet and optics design, together with accelerator physics considerations, are likely to provide unique opportunities for enhanced collider performance optimization. [Preview Abstract] |
Saturday, April 17, 2021 2:30PM - 2:42PM Live |
D14.00004: Progress on Radio Frequency Cavities for Use in Muon Cooling Channels Daniel Bowring, Alan Bross, Ben Freemire, Yagmur Torun, Katsuya Yonehara An intense muon beam produced by the decay of pions coming from a high power proton beam hitting a target requires significant cooling before it can be useful in a Muon Collider or Neutrino Factory. The preferred method of accomplishing this is ionization cooling, recently demonstrated by the Muon Ionization Cooling Experiment. Efficient cooling requires radio frequency cavities to operate in multi-tesla magnetic fields. This has historically been problematic, as cavities operating under this condition exhibit increased susceptibility to RF breakdown. An experimental program carried out at the MuCool Test Area at Fermilab has experimentally verified two methods that allow normal conducting RF cavities to operate in external multi-tesla magnetic fields. Through the careful design and material selection using beryllium elements, stable high vacuum operation at gradients of 50 MV/m were achieved. Additionally, filling a cavity with high pressure hydrogen gas also allowed operation at 50 MV/m. These solutions eliminate a significant technical risk inherent to muon cooling channels. [Preview Abstract] |
Saturday, April 17, 2021 2:42PM - 2:54PM Live |
D14.00005: Electroweak Couplings of the Higgs Boson at a Multi-TeV Muon Collider Xing Wang, Tao Han, Ian Low, Da Liu We estimate the expected precision at a multi-TeV muon collider for measuring the Higgs boson couplings with electroweak gauge bosons, $HVV$ and $HHVV\ (V=W^\pm,Z)$, as well as the trilinear Higgs self-coupling $HHH$. At very high energies both single and double Higgs productions rely on the vector-boson fusion (VBF) topology. The outgoing remnant particles have a strong tendency to stay in the very forward region, leading to the configuration of the ``inclusive process'' and making it difficult to isolate $ZZ$ fusion events from the $WW$ fusion. In the single Higgs channel, we perform a maximum likelihood analysis on $HWW$ and $HZZ$ couplings using two categories: the inclusive Higgs production and the 1-muon exclusive signal. In the double Higgs channel, we consider the inclusive production and study the interplay of the trilinear $HHH$ and the quartic $VVHH$ couplings, by utilizing kinematic information in the invariant mass spectrum. We find that at a centre-of-mass energy of 10 TeV (30 TeV) with an integrated luminosity of 10 ab$^{-1}$ (90 ab$^{-1}$), one may reach a 95\% confidence level sensitivity of 0.073\% (0.023\%) for $WWH$ coupling, 0.61\% (0.21\%) for $ZZH$ coupling, 0.6\% (0.20\%) for $WWHH$ coupling, and 5.6\% (2.0\%) for $HHH$ coupling. [Preview Abstract] |
Saturday, April 17, 2021 2:54PM - 3:06PM Live |
D14.00006: Track Reconstruction at a Muon Collider in the Presence of Beam-induced Background Massimo Casarsa, Alessandro Montella, Paolo Andreetto, Laura Buonincontri, Alessio Gianelle, Lorenzo Sestini, Donatella Lucchesi, Nazar Bartosik, Nadia Pastrone, Sergo Jindariani, Hannsjoerg Weber, Karol Krizka, Simone Pagan Griso, Elodie Resseguie, Lawrence Lee, Federico Meloni, Philip Chang, David Yu Among the projects currently under study for the post-LHC generation of particle accelerators, the muon collider represents a unique machine, which has the capability to provide leptonic collisions at energies of several TeV and to open the path to a vast and mostly unexplored Physics programme. However, on the experimental side, such a great Physics potential is accompanied by unprecedented technological challenges, due to the fact that muons are unstable particles. Their decay products interact with the machine elements and produce an intense flux of background particles that eventually reach the detector and might degrade its performance. Being the closest detector to the beamline, the tracker is the most affected by the beam-induced background. This contribution will outline the measures adopted in order to mitigate the background effects on the track reconstruction and will present the tracking performance in the presence of the beam-induced background. [Preview Abstract] |
Saturday, April 17, 2021 3:06PM - 3:18PM Live |
D14.00007: Muon Collider Lattice Design Eliana Gianfelice-Wendt High Energy Physics research is heavily based on particle colliders. There is only one collider operating at the energy frontier, namely the CERN LHC for which a luminosity upgrade is in preparation and is expected to operate until 2035. While many still unanswered questions call for more powerful tools for the post-LHC era, the costs for building and operating larger facilities is the main obstacle to their realization. Technological advancements and new ideas are key ingredients for overcoming the impasse. A Muon Collider could be a more affordable alternative to hadron and electron-positron colliders. First proposed by Budker in 1967, the idea of a MC has been revived in the US at the end of the 90s and many studies addressing the different aspects of such a facility have been published. In this talk I will give an overview of lattice designs which were proposed for the MC before such studies were put on hold in 2016. [Preview Abstract] |
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